├── .gitignore
├── LICENSE
├── Makefile
├── README.md
├── config.h
├── device.h
├── flash
├── hardware
├── AFSK.c
├── AFSK.h
├── Serial.c
└── Serial.h
├── images
└── .keepdir
├── main.c
├── precompiled
├── MicroModemGP-direct.hex
└── MicroModemGP-kiss.hex
├── protocol
├── AX25.c
├── AX25.h
├── HDLC.h
├── KISS.c
├── KISS.h
├── LLP.c
└── LLP.h
└── util
├── CRC-CCIT.c
├── CRC-CCIT.h
├── FIFO.h
├── constants.h
└── time.h
/.gitignore:
--------------------------------------------------------------------------------
1 | obj
2 | *.project
3 | *.workspace
4 | *.o
5 | *.d
6 | resources
7 | images/*.bin
8 | images/*.s19
9 | images/*.eep
10 | images/*.lss
11 | images/*.map
12 | images/*.elf
13 | images/*.sym
14 | images/*.hex
15 | flashdefault
16 | flashcurrent
17 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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557 | combined work, and to convey the resulting work. The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 |
563 | 14. Revised Versions of this License.
564 |
565 | The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time. Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 |
570 | Each version is given a distinguishing version number. If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation. If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 | {one line to give the program's name and a brief idea of what it does.}
635 | Copyright (C) {year} {name of author}
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | {project} Copyright (C) {year} {fullname}
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
676 |
--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
1 | # AVR Sample makefile written by Eric B. Weddington, Jörg Wunsch, et al.
2 | # Modified (bringing often-changed options to the top) by Elliot Williams
3 |
4 | # make all = Make software and program
5 | # make clean = Clean out built project files.
6 | # make program = Download the hex file to the device, using avrdude. Please
7 | # customize the avrdude settings below first!
8 |
9 | # Microcontroller Type
10 | #MCU = atmega1284p
11 | #MCU = atmega644p
12 | MCU = atmega328p
13 |
14 | # Target file name (without extension).
15 | TARGET = images/MicroModemGP
16 |
17 | # Programming hardware: type avrdude -c ?
18 | # to get a full listing.
19 | AVRDUDE_PROGRAMMER = arduino
20 |
21 | AVRDUDE_PORT = /dev/usb # not really needed for usb
22 | #AVRDUDE_PORT = /dev/parport0 # linux
23 | # AVRDUDE_PORT = lpt1 # windows
24 |
25 | ############# Don't need to change below here for most purposes (Elliot)
26 |
27 | # Optimization level, can be [0, 1, 2, 3, s]. 0 turns off optimization.
28 | # (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
29 | OPT = s
30 |
31 | # Output format. (can be srec, ihex, binary)
32 | FORMAT = ihex
33 |
34 | # List C source files here. (C dependencies are automatically generated.)
35 | #SRC = $(TARGET).c
36 | SRC = main.c hardware/Serial.c hardware/AFSK.c util/CRC-CCIT.c protocol/LLP.c protocol/KISS.c
37 |
38 | # If there is more than one source file, append them above, or modify and
39 | # uncomment the following:
40 | #SRC += foo.c bar.c
41 |
42 | # You can also wrap lines by appending a backslash to the end of the line:
43 | #SRC += baz.c \
44 | #xyzzy.c
45 |
46 |
47 |
48 | # List Assembler source files here.
49 | # Make them always end in a capital .S. Files ending in a lowercase .s
50 | # will not be considered source files but generated files (assembler
51 | # output from the compiler), and will be deleted upon "make clean"!
52 | # Even though the DOS/Win* filesystem matches both .s and .S the same,
53 | # it will preserve the spelling of the filenames, and gcc itself does
54 | # care about how the name is spelled on its command-line.
55 | ASRC =
56 |
57 |
58 | # List any extra directories to look for include files here.
59 | # Each directory must be seperated by a space.
60 | EXTRAINCDIRS =
61 |
62 |
63 | # Optional compiler flags.
64 | # -g: generate debugging information (for GDB, or for COFF conversion)
65 | # -O*: optimization level
66 | # -f...: tuning, see gcc manual and avr-libc documentation
67 | # -Wall...: warning level
68 | # -Wa,...: tell GCC to pass this to the assembler.
69 | # -ahlms: create assembler listing
70 | CFLAGS = -g -O$(OPT) \
71 | -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums \
72 | -Wall -Wstrict-prototypes \
73 | -Wa,-adhlns=$(<:.c=.lst) \
74 | $(patsubst %,-I%,$(EXTRAINCDIRS))
75 |
76 |
77 | # Set a "language standard" compiler flag.
78 | # Unremark just one line below to set the language standard to use.
79 | # gnu99 = C99 + GNU extensions. See GCC manual for more information.
80 | #CFLAGS += -std=c89
81 | #CFLAGS += -std=gnu89
82 | #CFLAGS += -std=c99
83 | CFLAGS += -std=gnu99
84 |
85 |
86 |
87 | # Optional assembler flags.
88 | # -Wa,...: tell GCC to pass this to the assembler.
89 | # -ahlms: create listing
90 | # -gstabs: have the assembler create line number information; note that
91 | # for use in COFF files, additional information about filenames
92 | # and function names needs to be present in the assembler source
93 | # files -- see avr-libc docs [FIXME: not yet described there]
94 | ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs
95 |
96 |
97 |
98 | # Optional linker flags.
99 | # -Wl,...: tell GCC to pass this to linker.
100 | # -Map: create map file
101 | # --cref: add cross reference to map file
102 | LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
103 |
104 |
105 |
106 | # Additional libraries
107 |
108 | # Minimalistic printf version
109 | #LDFLAGS += -Wl,-u,vfprintf -lprintf_min
110 |
111 | # Floating point printf version (requires -lm below)
112 | #LDFLAGS += -Wl,-u,vfprintf -lprintf_flt
113 |
114 | # -lm = math library
115 | LDFLAGS += -lm
116 |
117 |
118 | # Programming support using avrdude. Settings and variables.
119 |
120 |
121 | AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
122 | #AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep
123 |
124 | AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
125 |
126 | # Uncomment the following if you want avrdude's erase cycle counter.
127 | # Note that this counter needs to be initialized first using -Yn,
128 | # see avrdude manual.
129 | #AVRDUDE_ERASE += -y
130 |
131 | # Uncomment the following if you do /not/ wish a verification to be
132 | # performed after programming the device.
133 | #AVRDUDE_FLAGS += -V
134 |
135 | # Increase verbosity level. Please use this when submitting bug
136 | # reports about avrdude. See
137 | # to submit bug reports.
138 | #AVRDUDE_FLAGS += -v -v
139 |
140 | #Run while cable attached or don't
141 | AVRDUDE_FLAGS += -E reset #keep chip disabled while cable attached
142 | #AVRDUDE_FLAGS += -E noreset
143 |
144 | #AVRDUDE_WRITE_FLASH = -U lfuse:w:0x04:m #run with 8 Mhz clock
145 |
146 | #AVRDUDE_WRITE_FLASH = -U lfuse:w:0x21:m #run with 1 Mhz clock #default clock mode
147 |
148 | #AVRDUDE_WRITE_FLASH = -U lfuse:w:0x01:m #run with 1 Mhz clock no start up time
149 |
150 | # ---------------------------------------------------------------------------
151 |
152 | # Define programs and commands.
153 | SHELL = sh
154 |
155 | CC = avr-gcc
156 |
157 | OBJCOPY = avr-objcopy
158 | OBJDUMP = avr-objdump
159 | SIZE = avr-size
160 |
161 |
162 | # Programming support using avrdude.
163 | AVRDUDE = avrdude
164 |
165 |
166 | REMOVE = rm -f
167 | COPY = cp
168 |
169 | HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
170 | ELFSIZE = $(SIZE) --mcu=$(MCU) -C $(TARGET).elf
171 |
172 |
173 | # Define Messages
174 | # English
175 | MSG_ERRORS_NONE = Firmware compiled successfully!
176 | MSG_BEGIN = Starting build...
177 | MSG_END = -------- Done --------
178 | MSG_SIZE_BEFORE = Size before:
179 | MSG_SIZE_AFTER = Size after:
180 | MSG_COFF = Converting to AVR COFF:
181 | MSG_EXTENDED_COFF = Converting to AVR Extended COFF:
182 | MSG_FLASH = Creating load file for Flash:
183 | MSG_EEPROM = Creating load file for EEPROM:
184 | MSG_EXTENDED_LISTING = Creating Extended Listing:
185 | MSG_SYMBOL_TABLE = Creating Symbol Table:
186 | MSG_LINKING = Linking:
187 | MSG_COMPILING = Compiling:
188 | MSG_ASSEMBLING = Assembling:
189 | MSG_CLEANING = Cleaning project:
190 |
191 |
192 |
193 |
194 | # Define all object files.
195 | OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)
196 |
197 | # Define all listing files.
198 | LST = $(ASRC:.S=.lst) $(SRC:.c=.lst)
199 |
200 | # Combine all necessary flags and optional flags.
201 | # Add target processor to flags.
202 | ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS)
203 | ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)
204 |
205 |
206 |
207 | # Default target: make program!
208 | #all: begin gccversion sizebefore $(TARGET).elf $(TARGET).hex $(TARGET).eep \
209 | # $(TARGET).lss $(TARGET).sym sizeafter finished end
210 |
211 | all: begin $(TARGET).elf $(TARGET).hex $(TARGET).eep \
212 | $(TARGET).lss $(TARGET).sym cleanup sizeafter finished
213 | # $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
214 |
215 | # Eye candy.
216 | # AVR Studio 3.x does not check make's exit code but relies on
217 | # the following magic strings to be generated by the compile job.
218 | begin:
219 | @echo
220 | @echo $(MSG_BEGIN)
221 |
222 | finished:
223 | @echo $(MSG_ERRORS_NONE)
224 |
225 | end:
226 | @echo $(MSG_END)
227 | @echo
228 |
229 |
230 | # Display size of file.
231 | sizebefore:
232 | @if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); echo; fi
233 |
234 | sizeafter:
235 | @if [ -f $(TARGET).elf ]; then echo; $(ELFSIZE); echo; fi
236 |
237 |
238 |
239 | # Display compiler version information.
240 | gccversion :
241 | @$(CC) --version
242 |
243 |
244 |
245 |
246 | # Convert ELF to COFF for use in debugging / simulating in
247 | # AVR Studio or VMLAB.
248 | COFFCONVERT=$(OBJCOPY) --debugging \
249 | --change-section-address .data-0x800000 \
250 | --change-section-address .bss-0x800000 \
251 | --change-section-address .noinit-0x800000 \
252 | --change-section-address .eeprom-0x810000
253 |
254 |
255 | coff: $(TARGET).elf
256 | # @echo
257 | # @echo $(MSG_COFF) $(TARGET).cof
258 | @$(COFFCONVERT) -O coff-avr $< $(TARGET).cof
259 |
260 |
261 | extcoff: $(TARGET).elf
262 | # @echo
263 | # @echo $(MSG_EXTENDED_COFF) $(TARGET).cof
264 | @$(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof
265 |
266 |
267 |
268 |
269 | # Program the device.
270 | program: $(TARGET).hex $(TARGET).eep
271 | @$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
272 |
273 |
274 |
275 |
276 | # Create final output files (.hex, .eep) from ELF output file.
277 | %.hex: %.elf
278 | # @echo
279 | # @echo $(MSG_FLASH) $@
280 | @$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
281 |
282 | %.eep: %.elf
283 | # @echo
284 | # @echo $(MSG_EEPROM) $@
285 | # @echo Not generating any EEPROM images
286 | @-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 -O $(FORMAT) $< $@
287 |
288 | # Create extended listing file from ELF output file.
289 | %.lss: %.elf
290 | # @echo
291 | # @echo $(MSG_EXTENDED_LISTING) $@
292 | @$(OBJDUMP) -h -S $< > $@
293 |
294 | # Create a symbol table from ELF output file.
295 | %.sym: %.elf
296 | # @echo
297 | # @echo $(MSG_SYMBOL_TABLE) $@
298 | @avr-nm -n $< > $@
299 |
300 |
301 |
302 | # Link: create ELF output file from object files.
303 | .SECONDARY : $(TARGET).elf
304 | .PRECIOUS : $(OBJ)
305 | %.elf: $(OBJ)
306 | @echo $(MSG_LINKING) $@
307 | @$(CC) $(ALL_CFLAGS) $(OBJ) --output $@ $(LDFLAGS)
308 |
309 |
310 | # Compile: create object files from C source files.
311 | %.o : %.c
312 | @echo $(MSG_COMPILING) $<
313 | @$(CC) -c $(ALL_CFLAGS) $< -o $@
314 |
315 |
316 | # Compile: create assembler files from C source files.
317 | %.s : %.c
318 | @$(CC) -S $(ALL_CFLAGS) $< -o $@
319 |
320 |
321 | # Assemble: create object files from assembler source files.
322 | %.o : %.S
323 | @echo
324 | @echo $(MSG_ASSEMBLING) $<
325 | @$(CC) -c $(ALL_ASFLAGS) $< -o $@
326 |
327 |
328 |
329 | # Target: clean project.
330 | clean: clean_list finished
331 |
332 | clean_list :
333 | @echo
334 | @echo $(MSG_CLEANING)
335 | $(REMOVE) $(TARGET).hex
336 | $(REMOVE) $(TARGET).eep
337 | $(REMOVE) $(TARGET).obj
338 | $(REMOVE) $(TARGET).cof
339 | $(REMOVE) $(TARGET).elf
340 | $(REMOVE) $(TARGET).map
341 | $(REMOVE) $(TARGET).obj
342 | $(REMOVE) $(TARGET).a90
343 | $(REMOVE) $(TARGET).sym
344 | $(REMOVE) $(TARGET).lnk
345 | $(REMOVE) $(TARGET).lss
346 | $(REMOVE) $(OBJ)
347 | $(REMOVE) $(LST)
348 | $(REMOVE) $(SRC:.c=.s)
349 | $(REMOVE) $(SRC:.c=.d)
350 | $(REMOVE) *~
351 |
352 | cleanup:
353 | @$(REMOVE) $(SRC:.c=.s)
354 | @$(REMOVE) $(SRC:.c=.d)
355 | @$(REMOVE) $(LST)
356 |
357 | # Automatically generate C source code dependencies.
358 | # (Code originally taken from the GNU make user manual and modified
359 | # (See README.txt Credits).)
360 | #
361 | # Note that this will work with sh (bash) and sed that is shipped with WinAVR
362 | # (see the SHELL variable defined above).
363 | # This may not work with other shells or other seds.
364 | #
365 | %.d: %.c
366 | @set -e; $(CC) -MM $(ALL_CFLAGS) $< \
367 | | sed 's,\(.*\)\.o[ :]*,\1.o \1.d : ,g' > $@; \
368 | [ -s $@ ] || rm -f $@
369 |
370 |
371 | # Remove the '-' if you want to see the dependency files generated.
372 | -include $(SRC:.c=.d)
373 |
374 |
375 |
376 | # Listing of phony targets.
377 | .PHONY : all begin finish end sizebefore sizeafter gccversion coff extcoff \
378 | clean clean_list program
379 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | MicroModemGP
2 | ==========
3 |
4 | MicroModemGP is a general purpose firmware for [MicroModem](http://unsigned.io/micromodem).
5 |
6 | It supports both KISS mode serial connections, and direct serial connection without framing for easy communication with anything with a serial port.
7 |
8 | You can buy a complete modem from [my shop](http://unsigned.io/shop), or you can build one yourself pretty easily. Take a look at the documentation in the [MicroModem](https://github.com/markqvist/MicroModem) repository for information and getting started guides!
9 |
10 | ## Some features
11 |
12 | - Easily send and receive packets over mostly any radio
13 | - Full modulation and demodulation in software
14 | - Flexibility in how received packets are output over serial connection
15 | - Can run with open squelch
16 | - Supports KISS mode for use with programs on a host computer
17 | - 12,8 Hamming-code forward error correction and 12-byte interleaving
18 | - CRC checksum on packets ensure data integrity
19 | - Supports packets with up to 564 bytes of data
20 |
21 | ## Serial connection settings
22 |
23 | By default, the modem uses __9600 baud, 8N1__ serial. The baudrate can be modified in the "device.h" file.
24 |
25 | ## KISS mode or direct serial framing
26 |
27 | You can configure whether to use KISS serial framing or direct serial framing in the "config.h" file.
28 |
29 | When the modem is running in KISS mode, there's really not much more to it than connecting the modem to a computer, opening whatever program you want to use with it, and off you go.
30 |
31 | You can also configure the modem in direct serial framing mode. If using direct serial framing, the firmware uses time-sensitive input, which means that it will buffer serial data as it comes in, and when it has received no data for a few milliseconds, it will start sending whatever it has received.
32 |
33 | If you're manually typing things to the modem from a terminal, you should therefore set your serial terminal program to not send data for every keystroke, but only on new-line, or pressing send or whatever. You can also compile the firmware for KISS mode serial connection, if you have a host program using KISS. If you are using MicroModemGP with [Reticulum](https://github.com/markqvist/Reticulum), use KISS.
34 |
35 | ## Other notes
36 |
37 | The project has been implemented in your normal C with makefile style, and uses AVR Libc. The firmware is compatible with Arduino-based products, although it was not written in the Arduino IDE.
38 |
39 | Visit [my site](http://unsigned.io) for questions, comments and other details.
40 |
--------------------------------------------------------------------------------
/config.h:
--------------------------------------------------------------------------------
1 | #ifndef CONFIG_H
2 | #define CONFIG_H
3 |
4 | // Choose whether to use KISS or direct
5 | // framing for serial data
6 | #define SERIAL_FRAMING SERIAL_FRAMING_KISS
7 | //#define SERIAL_FRAMING SERIAL_FRAMING_DIRECT
8 |
9 | #endif
--------------------------------------------------------------------------------
/device.h:
--------------------------------------------------------------------------------
1 | #include "util/constants.h"
2 |
3 | #ifndef DEVICE_CONFIGURATION
4 | #define DEVICE_CONFIGURATION
5 |
6 | // CPU settings
7 | #define TARGET_CPU m328p
8 | #define F_CPU 16000000
9 | #define FREQUENCY_CORRECTION 0
10 |
11 | // ADC settings
12 | #define OPEN_SQUELCH true
13 | #define ADC_REFERENCE REF_3V3
14 | // OR
15 | //#define ADC_REFERENCE REF_5V
16 |
17 | // Sampling & timer setup
18 | #define CONFIG_AFSK_DAC_SAMPLERATE 9600
19 |
20 | // Don't change this! Change it in
21 | // config.h instead. This is going away
22 | // soon, and only an intermediary thing.
23 | #define SERIAL_PROTOCOL PROTOCOL_KISS
24 |
25 | // Serial settings
26 | #define BAUD 9600
27 | #define SERIAL_DEBUG false
28 | #define TX_MAXWAIT 5UL
29 |
30 | // Port settings
31 | #if TARGET_CPU == m328p
32 | #define DAC_PORT PORTD
33 | #define DAC_DDR DDRD
34 | #define LED_PORT PORTB
35 | #define LED_DDR DDRB
36 | #define ADC_PORT PORTC
37 | #define ADC_DDR DDRC
38 | #endif
39 |
40 | #endif
--------------------------------------------------------------------------------
/flash:
--------------------------------------------------------------------------------
1 | #!/bin/bash
2 | avrdude -p $2 -c arduino -P /dev/tty$1 -b 115200 -F -U flash:w:images/MicroModemGP.hex
3 |
--------------------------------------------------------------------------------
/hardware/AFSK.c:
--------------------------------------------------------------------------------
1 | #include
2 | #include "AFSK.h"
3 | #include "util/time.h"
4 |
5 | extern volatile ticks_t _clock;
6 | extern unsigned long custom_preamble;
7 | extern unsigned long custom_tail;
8 |
9 | bool hw_afsk_dac_isr = false;
10 | bool hw_5v_ref = false;
11 | Afsk *AFSK_modem;
12 |
13 | // Forward declerations
14 | int afsk_getchar(FILE *strem);
15 | int afsk_putchar(char c, FILE *stream);
16 |
17 | void AFSK_hw_refDetect(void) {
18 | // This is manual for now
19 | #if ADC_REFERENCE == REF_5V
20 | hw_5v_ref = true;
21 | #else
22 | hw_5v_ref = false;
23 | #endif
24 | }
25 |
26 | void AFSK_hw_init(void) {
27 | // Set up ADC
28 |
29 | AFSK_hw_refDetect();
30 |
31 | TCCR1A = 0;
32 | TCCR1B = _BV(CS10) | _BV(WGM13) | _BV(WGM12);
33 | ICR1 = (((CPU_FREQ+FREQUENCY_CORRECTION)) / 9600) - 1;
34 |
35 | if (hw_5v_ref) {
36 | ADMUX = _BV(REFS0) | 0;
37 | } else {
38 | ADMUX = 0;
39 | }
40 |
41 | ADC_DDR &= ~_BV(0);
42 | ADC_PORT &= ~_BV(0);
43 | DIDR0 |= _BV(0);
44 | ADCSRB = _BV(ADTS2) |
45 | _BV(ADTS1) |
46 | _BV(ADTS0);
47 | ADCSRA = _BV(ADEN) |
48 | _BV(ADSC) |
49 | _BV(ADATE)|
50 | _BV(ADIE) |
51 | _BV(ADPS2);
52 |
53 | AFSK_DAC_INIT();
54 | LED_TX_INIT();
55 | LED_RX_INIT();
56 | }
57 |
58 | void AFSK_init(Afsk *afsk) {
59 | // Allocate modem struct memory
60 | memset(afsk, 0, sizeof(*afsk));
61 | AFSK_modem = afsk;
62 | // Set phase increment
63 | afsk->phaseInc = MARK_INC;
64 | afsk->silentSamples = 0;
65 |
66 | // Initialise FIFO buffers
67 | fifo_init(&afsk->delayFifo, (uint8_t *)afsk->delayBuf, sizeof(afsk->delayBuf));
68 | fifo_init(&afsk->rxFifo, afsk->rxBuf, sizeof(afsk->rxBuf));
69 | fifo_init(&afsk->txFifo, afsk->txBuf, sizeof(afsk->txBuf));
70 |
71 | // Fill delay FIFO with zeroes
72 | for (int i = 0; idelayFifo, 0);
74 | }
75 |
76 | AFSK_hw_init();
77 |
78 | // Set up streams
79 | FILE afsk_fd = FDEV_SETUP_STREAM(afsk_putchar, afsk_getchar, _FDEV_SETUP_RW);
80 | afsk->fd = afsk_fd;
81 | }
82 |
83 | static void AFSK_txStart(Afsk *afsk) {
84 | if (!afsk->sending) {
85 | afsk->phaseInc = MARK_INC;
86 | afsk->phaseAcc = 0;
87 | afsk->bitstuffCount = 0;
88 | afsk->sending = true;
89 | afsk->sending_data = true;
90 | LED_TX_ON();
91 | afsk->preambleLength = DIV_ROUND(custom_preamble * BITRATE, 8000);
92 | AFSK_DAC_IRQ_START();
93 | }
94 | ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
95 | afsk->tailLength = DIV_ROUND(custom_tail * BITRATE, 8000);
96 | }
97 | }
98 |
99 | int afsk_putchar(char c, FILE *stream) {
100 | AFSK_txStart(AFSK_modem);
101 | while(fifo_isfull_locked(&AFSK_modem->txFifo)) { /* Wait */ }
102 | fifo_push_locked(&AFSK_modem->txFifo, c);
103 | return 1;
104 | }
105 |
106 | int afsk_getchar(FILE *stream) {
107 | if (fifo_isempty_locked(&AFSK_modem->rxFifo)) {
108 | return EOF;
109 | } else {
110 | return fifo_pop_locked(&AFSK_modem->rxFifo);
111 | }
112 | }
113 |
114 | void AFSK_transmit(char *buffer, size_t size) {
115 | fifo_flush(&AFSK_modem->txFifo);
116 | int i = 0;
117 | while (size--) {
118 | afsk_putchar(buffer[i++], NULL);
119 | }
120 | }
121 |
122 | uint8_t AFSK_dac_isr(Afsk *afsk) {
123 | if (afsk->sampleIndex == 0) {
124 | if (afsk->txBit == 0) {
125 | if (fifo_isempty(&afsk->txFifo) && afsk->tailLength == 0) {
126 | AFSK_DAC_IRQ_STOP();
127 | afsk->sending = false;
128 | afsk->sending_data = false;
129 | LED_TX_OFF();
130 | return 0;
131 | } else {
132 | if (!afsk->bitStuff) afsk->bitstuffCount = 0;
133 | afsk->bitStuff = true;
134 | if (afsk->preambleLength == 0) {
135 | if (fifo_isempty(&afsk->txFifo)) {
136 | afsk->sending_data = false;
137 | afsk->tailLength--;
138 | afsk->currentOutputByte = HDLC_FLAG;
139 | } else {
140 | afsk->currentOutputByte = fifo_pop(&afsk->txFifo);
141 | }
142 | } else {
143 | afsk->preambleLength--;
144 | afsk->currentOutputByte = HDLC_FLAG;
145 | }
146 | if (afsk->currentOutputByte == LLP_ESC) {
147 | if (fifo_isempty(&afsk->txFifo)) {
148 | AFSK_DAC_IRQ_STOP();
149 | afsk->sending = false;
150 | LED_TX_OFF();
151 | return 0;
152 | } else {
153 | afsk->currentOutputByte = fifo_pop(&afsk->txFifo);
154 | }
155 | } else if (afsk->currentOutputByte == HDLC_FLAG || afsk->currentOutputByte == HDLC_RESET) {
156 | afsk->bitStuff = false;
157 | }
158 | }
159 | afsk->txBit = 0x01;
160 | }
161 |
162 | if (afsk->bitStuff && afsk->bitstuffCount >= BIT_STUFF_LEN) {
163 | afsk->bitstuffCount = 0;
164 | afsk->phaseInc = SWITCH_TONE(afsk->phaseInc);
165 | } else {
166 | if (afsk->currentOutputByte & afsk->txBit) {
167 | afsk->bitstuffCount++;
168 | } else {
169 | afsk->bitstuffCount = 0;
170 | afsk->phaseInc = SWITCH_TONE(afsk->phaseInc);
171 | }
172 | afsk->txBit <<= 1;
173 | }
174 |
175 | afsk->sampleIndex = SAMPLESPERBIT;
176 | }
177 |
178 | afsk->phaseAcc += afsk->phaseInc;
179 | afsk->phaseAcc %= SIN_LEN;
180 | afsk->sampleIndex--;
181 |
182 | return sinSample(afsk->phaseAcc);
183 | }
184 |
185 | static bool hdlcParse(Hdlc *hdlc, bool bit, FIFOBuffer *fifo) {
186 | // Initialise a return value. We start with the
187 | // assumption that all is going to end well :)
188 | bool ret = true;
189 |
190 | // Bitshift our byte of demodulated bits to
191 | // the left by one bit, to make room for the
192 | // next incoming bit
193 | hdlc->demodulatedBits <<= 1;
194 | // And then put the newest bit from the
195 | // demodulator into the byte.
196 | hdlc->demodulatedBits |= bit ? 1 : 0;
197 |
198 | // Now we'll look at the last 8 received bits, and
199 | // check if we have received a HDLC flag (01111110)
200 | if (hdlc->demodulatedBits == HDLC_FLAG) {
201 | // If we have, check that our output buffer is
202 | // not full.
203 | if (!fifo_isfull(fifo)) {
204 | // If it isn't, we'll push the HDLC_FLAG into
205 | // the buffer and indicate that we are now
206 | // receiving data. For bling we also turn
207 | // on the RX LED.
208 | fifo_push(fifo, HDLC_FLAG);
209 | hdlc->receiving = true;
210 |
211 | if (hdlc->dcd_count < DCD_MIN_COUNT) {
212 | hdlc->dcd = false;
213 | hdlc->dcd_count++;
214 | } else {
215 | hdlc->dcd = true;
216 | }
217 |
218 | #if OPEN_SQUELCH == false
219 | LED_RX_ON();
220 | #endif
221 | } else {
222 | // If the buffer is full, we have a problem
223 | // and abort by setting the return value to
224 | // false and stopping the here.
225 |
226 | ret = false;
227 | hdlc->receiving = false;
228 | hdlc->dcd = false;
229 | hdlc->dcd_count = 0;
230 | }
231 |
232 | // Everytime we receive a HDLC_FLAG, we reset the
233 | // storage for our current incoming byte and bit
234 | // position in that byte. This effectively
235 | // synchronises our parsing to the start and end
236 | // of the received bytes.
237 | hdlc->currentByte = 0;
238 | hdlc->bitIndex = 0;
239 | return ret;
240 | }
241 |
242 | // Check if we have received a RESET flag (01111111)
243 | // In this comparison we also detect when no transmission
244 | // (or silence) is taking place, and the demodulator
245 | // returns an endless stream of zeroes. Due to the NRZ-S
246 | // coding, the actual bits send to this function will
247 | // be an endless stream of ones, which this AND operation
248 | // will also detect.
249 | if ((hdlc->demodulatedBits & HDLC_RESET) == HDLC_RESET) {
250 | // If we have, something probably went wrong at the
251 | // transmitting end, and we abort the reception.
252 | hdlc->receiving = false;
253 | hdlc->dcd = false;
254 | hdlc->dcd_count = 0;
255 | return ret;
256 | }
257 |
258 | // Check the DCD status and set RX LED appropriately
259 | if (hdlc->dcd) {
260 | LED_RX_ON();
261 | } else {
262 | LED_RX_OFF();
263 | }
264 |
265 | // If we have not yet seen a HDLC_FLAG indicating that
266 | // a transmission is actually taking place, don't bother
267 | // with anything.
268 | if (!hdlc->receiving) {
269 | hdlc->dcd = false;
270 | hdlc->dcd_count = 0;
271 |
272 | return ret;
273 | }
274 |
275 | // First check if what we are seeing is a stuffed bit.
276 | // Since the different HDLC control characters like
277 | // HDLC_FLAG, HDLC_RESET and such could also occur in
278 | // a normal data stream, we employ a method known as
279 | // "bit stuffing". All control characters have more than
280 | // 5 ones in a row, so if the transmitting party detects
281 | // this sequence in the _data_ to be transmitted, it inserts
282 | // a zero to avoid the receiving party interpreting it as
283 | // a control character. Therefore, if we detect such a
284 | // "stuffed bit", we simply ignore it and wait for the
285 | // next bit to come in.
286 | //
287 | // We do the detection by applying an AND bit-mask to the
288 | // stream of demodulated bits. This mask is 00111111 (0x3f)
289 | // if the result of the operation is 00111110 (0x3e), we
290 | // have detected a stuffed bit.
291 | if ((hdlc->demodulatedBits & 0x3f) == 0x3e)
292 | return ret;
293 |
294 | // If we have an actual 1 bit, push this to the current byte
295 | // If it's a zero, we don't need to do anything, since the
296 | // bit is initialized to zero when we bitshifted earlier.
297 | if (hdlc->demodulatedBits & 0x01)
298 | hdlc->currentByte |= 0x80;
299 |
300 | // Increment the bitIndex and check if we have a complete byte
301 | if (++hdlc->bitIndex >= 8) {
302 | // If we have a HDLC control character, put a AX.25 escape
303 | // in the received data. We know we need to do this,
304 | // because at this point we must have already seen a HDLC
305 | // flag, meaning that this control character is the result
306 | // of a bitstuffed byte that is equal to said control
307 | // character, but is actually part of the data stream.
308 | // By inserting the escape character, we tell the protocol
309 | // layer that this is not an actual control character, but
310 | // data.
311 | if ((hdlc->currentByte == HDLC_FLAG ||
312 | hdlc->currentByte == HDLC_RESET ||
313 | hdlc->currentByte == LLP_ESC)) {
314 | // We also need to check that our received data buffer
315 | // is not full before putting more data in
316 | if (!fifo_isfull(fifo)) {
317 | fifo_push(fifo, LLP_ESC);
318 | } else {
319 | // If it is, abort and return false
320 | hdlc->receiving = false;
321 | hdlc->dcd = false;
322 | hdlc->dcd_count = 0;
323 | LED_RX_OFF();
324 | ret = false;
325 | }
326 | }
327 |
328 | // Push the actual byte to the received data FIFO,
329 | // if it isn't full.
330 | if (!fifo_isfull(fifo)) {
331 | fifo_push(fifo, hdlc->currentByte);
332 | } else {
333 | // If it is, well, you know by now!
334 | hdlc->receiving = false;
335 | hdlc->dcd = false;
336 | hdlc->dcd_count = 0;
337 | LED_RX_OFF();
338 | ret = false;
339 | }
340 |
341 | // Wipe received byte and reset bit index to 0
342 | hdlc->currentByte = 0;
343 | hdlc->bitIndex = 0;
344 |
345 | } else {
346 | // We don't have a full byte yet, bitshift the byte
347 | // to make room for the next bit
348 | hdlc->currentByte >>= 1;
349 | }
350 |
351 | return ret;
352 | }
353 |
354 |
355 | void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
356 | // To determine the received frequency, and thereby
357 | // the bit of the sample, we multiply the sample by
358 | // a sample delayed by (samples per bit / 2).
359 | // We then lowpass-filter the samples with a
360 | // Chebyshev filter. The lowpass filtering serves
361 | // to "smooth out" the variations in the samples.
362 |
363 | afsk->iirX[0] = afsk->iirX[1];
364 |
365 | #if FILTER_CUTOFF == 600
366 | afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) >> 2;
367 | // The above is a simplification of:
368 | // afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / 3.558147322;
369 | #elif FILTER_CUTOFF == 800
370 | afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) >> 2;
371 | // The above is a simplification of:
372 | // afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / 2.899043379;
373 | #elif FILTER_CUTOFF == 1200
374 | afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) >> 1;
375 | // The above is a simplification of:
376 | // afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / 2.228465666;
377 | #elif FILTER_CUTOFF == 1600
378 | afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) >> 1;
379 | // The above is a simplification of:
380 | // afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / 1.881349100;
381 | #else
382 | #error Unsupported filter cutoff!
383 | #endif
384 |
385 | afsk->iirY[0] = afsk->iirY[1];
386 |
387 | #if FILTER_CUTOFF == 600
388 | afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] >> 1);
389 | // The above is a simplification of a first-order 600Hz chebyshev filter:
390 | // afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] * 0.4379097269);
391 | #elif FILTER_CUTOFF == 800
392 | afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] / 3);
393 | // The above is a simplification of a first-order 800Hz chebyshev filter:
394 | // afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] * 0.3101172565);
395 | #elif FILTER_CUTOFF == 1200
396 | afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] / 10);
397 | // The above is a simplification of a first-order 1200Hz chebyshev filter:
398 | // afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] * 0.1025215106);
399 | #elif FILTER_CUTOFF == 1600
400 | afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + -1*(afsk->iirY[0] / 17);
401 | // The above is a simplification of a first-order 1600Hz chebyshev filter:
402 | // afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] * -0.0630669239);
403 | #else
404 | #error Unsupported filter cutoff!
405 | #endif
406 |
407 |
408 | // We put the sampled bit in a delay-line:
409 | // First we bitshift everything 1 left
410 | afsk->sampledBits <<= 1;
411 | // And then add the sampled bit to our delay line
412 | afsk->sampledBits |= (afsk->iirY[1] > 0) ? 0 : 1;
413 |
414 | // Put the current raw sample in the delay FIFO
415 | fifo_push(&afsk->delayFifo, currentSample);
416 |
417 | // We need to check whether there is a signal transition.
418 | // If there is, we can recalibrate the phase of our
419 | // sampler to stay in sync with the transmitter. A bit of
420 | // explanation is required to understand how this works.
421 | // Since we have PHASE_MAX/PHASE_BITS = 8 samples per bit,
422 | // we employ a phase counter (currentPhase), that increments
423 | // by PHASE_BITS everytime a sample is captured. When this
424 | // counter reaches PHASE_MAX, it wraps around by modulus
425 | // PHASE_MAX. We then look at the last three samples we
426 | // captured and determine if the bit was a one or a zero.
427 | //
428 | // This gives us a "window" looking into the stream of
429 | // samples coming from the ADC. Sort of like this:
430 | //
431 | // Past Future
432 | // 0000000011111111000000001111111100000000
433 | // |________|
434 | // ||
435 | // Window
436 | //
437 | // Every time we detect a signal transition, we adjust
438 | // where this window is positioned a little. How much we
439 | // adjust it is defined by PHASE_INC. If our current phase
440 | // phase counter value is less than half of PHASE_MAX (ie,
441 | // the window size) when a signal transition is detected,
442 | // add PHASE_INC to our phase counter, effectively moving
443 | // the window a little bit backward (to the left in the
444 | // illustration), inversely, if the phase counter is greater
445 | // than half of PHASE_MAX, we move it forward a little.
446 | // This way, our "window" is constantly seeking to position
447 | // it's center at the bit transitions. Thus, we synchronise
448 | // our timing to the transmitter, even if it's timing is
449 | // a little off compared to our own.
450 | if (SIGNAL_TRANSITIONED(afsk->sampledBits)) {
451 | if (afsk->currentPhase < PHASE_THRESHOLD) {
452 | afsk->currentPhase += PHASE_INC;
453 | } else {
454 | afsk->currentPhase -= PHASE_INC;
455 | }
456 | afsk->silentSamples = 0;
457 | } else {
458 | afsk->silentSamples++;
459 | }
460 |
461 | // We increment our phase counter
462 | afsk->currentPhase += PHASE_BITS;
463 |
464 | // Check if we have reached the end of
465 | // our sampling window.
466 | if (afsk->currentPhase >= PHASE_MAX) {
467 | // If we have, wrap around our phase
468 | // counter by modulus
469 | afsk->currentPhase %= PHASE_MAX;
470 |
471 | // Bitshift to make room for the next
472 | // bit in our stream of demodulated bits
473 | afsk->actualBits <<= 1;
474 |
475 | // We determine the actual bit value by reading
476 | // the last 3 sampled bits. If there is two or
477 | // more 1's, we will assume that the transmitter
478 | // sent us a one, otherwise we assume a zero
479 | uint8_t bits = afsk->sampledBits & 0x07;
480 | if (bits == 0x07 || // 111
481 | bits == 0x06 || // 110
482 | bits == 0x05 || // 101
483 | bits == 0x03 // 011
484 | ) {
485 | afsk->actualBits |= 1;
486 | }
487 |
488 | //// Alternative using five bits ////////////////
489 | // uint8_t bits = afsk->sampledBits & 0x0f;
490 | // uint8_t c = 0;
491 | // c += bits & BV(1);
492 | // c += bits & BV(2);
493 | // c += bits & BV(3);
494 | // c += bits & BV(4);
495 | // c += bits & BV(5);
496 | // if (c >= 3) afsk->actualBits |= 1;
497 | /////////////////////////////////////////////////
498 |
499 | // Now we can pass the actual bit to the HDLC parser.
500 | // We are using NRZ-S coding, so if 2 consecutive bits
501 | // have the same value, we have a 1, otherwise a 0.
502 | // We use the TRANSITION_FOUND function to determine this.
503 | //
504 | // This is smart in combination with bit stuffing,
505 | // since it ensures a transmitter will never send more
506 | // than five consecutive 1's. When sending consecutive
507 | // ones, the signal stays at the same level, and if
508 | // this happens for longer periods of time, we would
509 | // not be able to synchronize our phase to the transmitter
510 | // and would start experiencing "bit slip".
511 | //
512 | // By combining bit-stuffing with NRZ-S coding, we ensure
513 | // that the signal will regularly make transitions
514 | // that we can use to synchronize our phase.
515 | //
516 | // We also check the return of the Link Control parser
517 | // to check if an error occured.
518 |
519 | if (!hdlcParse(&afsk->hdlc, !TRANSITION_FOUND(afsk->actualBits), &afsk->rxFifo)) {
520 | afsk->status |= 1;
521 | if (fifo_isfull(&afsk->rxFifo)) {
522 | fifo_flush(&afsk->rxFifo);
523 | afsk->status = 0;
524 | }
525 | }
526 | }
527 |
528 | if (afsk->silentSamples > DCD_TIMEOUT_SAMPLES) {
529 | afsk->silentSamples = 0;
530 | afsk->hdlc.dcd = false;
531 | LED_RX_OFF();
532 | }
533 |
534 | }
535 |
536 |
537 | ISR(ADC_vect) {
538 | TIFR1 = _BV(ICF1);
539 | AFSK_adc_isr(AFSK_modem, ((int16_t)((ADC) >> 2) - 128));
540 | if (hw_afsk_dac_isr) {
541 | DAC_PORT = (AFSK_dac_isr(AFSK_modem) & 0xF0) | _BV(3);
542 | } else {
543 | DAC_PORT = 128;
544 | }
545 | ++_clock;
546 | }
--------------------------------------------------------------------------------
/hardware/AFSK.h:
--------------------------------------------------------------------------------
1 | #ifndef AFSK_H
2 | #define AFSK_H
3 |
4 | #include "device.h"
5 | #include
6 | #include
7 | #include
8 | #include
9 | #include "util/FIFO.h"
10 | #include "util/time.h"
11 | #include "protocol/HDLC.h"
12 |
13 | #define SIN_LEN 512
14 | static const uint8_t sin_table[] PROGMEM =
15 | {
16 | 128, 129, 131, 132, 134, 135, 137, 138, 140, 142, 143, 145, 146, 148, 149, 151,
17 | 152, 154, 155, 157, 158, 160, 162, 163, 165, 166, 167, 169, 170, 172, 173, 175,
18 | 176, 178, 179, 181, 182, 183, 185, 186, 188, 189, 190, 192, 193, 194, 196, 197,
19 | 198, 200, 201, 202, 203, 205, 206, 207, 208, 210, 211, 212, 213, 214, 215, 217,
20 | 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
21 | 234, 234, 235, 236, 237, 238, 238, 239, 240, 241, 241, 242, 243, 243, 244, 245,
22 | 245, 246, 246, 247, 248, 248, 249, 249, 250, 250, 250, 251, 251, 252, 252, 252,
23 | 253, 253, 253, 253, 254, 254, 254, 254, 254, 255, 255, 255, 255, 255, 255, 255,
24 | };
25 |
26 | inline static uint8_t sinSample(uint16_t i) {
27 | uint16_t newI = i % (SIN_LEN/2);
28 | newI = (newI >= (SIN_LEN/4)) ? (SIN_LEN/2 - newI -1) : newI;
29 | uint8_t sine = pgm_read_byte(&sin_table[newI]);
30 | return (i >= (SIN_LEN/2)) ? (255 - sine) : sine;
31 | }
32 |
33 |
34 | #define SWITCH_TONE(inc) (((inc) == MARK_INC) ? SPACE_INC : MARK_INC)
35 | #define BITS_DIFFER(bits1, bits2) (((bits1)^(bits2)) & 0x01)
36 | #define DUAL_XOR(bits1, bits2) ((((bits1)^(bits2)) & 0x03) == 0x03)
37 | #define SIGNAL_TRANSITIONED(bits) DUAL_XOR((bits), (bits) >> 2)
38 | #define TRANSITION_FOUND(bits) BITS_DIFFER((bits), (bits) >> 1)
39 |
40 | #define CPU_FREQ F_CPU
41 |
42 | #define CONFIG_AFSK_RX_BUFLEN 64
43 | #define CONFIG_AFSK_TX_BUFLEN 64
44 | #define CONFIG_AFSK_RXTIMEOUT 0
45 | #define CONFIG_AFSK_PREAMBLE_LEN 350UL
46 | #define CONFIG_AFSK_TRAILER_LEN 50UL
47 | #define BIT_STUFF_LEN 5
48 |
49 | #define SAMPLERATE 9600
50 | #define BITRATE 1200
51 |
52 | #define SAMPLESPERBIT (SAMPLERATE / BITRATE)
53 | #define PHASE_INC 1 // Nudge by an eigth of a sample each adjustment
54 |
55 | #define DCD_MIN_COUNT 6
56 | #define DCD_TIMEOUT_SAMPLES 96
57 |
58 | #if BITRATE == 960
59 | #define FILTER_CUTOFF 600
60 | #define MARK_FREQ 960
61 | #define SPACE_FREQ 1600
62 | #define PHASE_BITS 10 // How much to increment phase counter each sample
63 | #elif BITRATE == 1200
64 | #define FILTER_CUTOFF 600
65 | #define MARK_FREQ 1200
66 | #define SPACE_FREQ 2200
67 | #define PHASE_BITS 8
68 | #elif BITRATE == 1600
69 | #define FILTER_CUTOFF 800
70 | #define MARK_FREQ 1600
71 | #define SPACE_FREQ 2600
72 | #define PHASE_BITS 8
73 | #else
74 | #error Unsupported bitrate!
75 | #endif
76 |
77 | #define PHASE_MAX (SAMPLESPERBIT * PHASE_BITS) // Resolution of our phase counter = 64
78 | #define PHASE_THRESHOLD (PHASE_MAX / 2) // Target transition point of our phase window
79 |
80 | typedef struct Hdlc
81 | {
82 | uint8_t demodulatedBits;
83 | uint8_t bitIndex;
84 | uint8_t currentByte;
85 | bool receiving;
86 | bool dcd;
87 | uint8_t dcd_count;
88 | } Hdlc;
89 |
90 | typedef struct Afsk
91 | {
92 | // Stream access to modem
93 | FILE fd;
94 |
95 | // General values
96 | Hdlc hdlc; // We need a link control structure
97 | uint16_t preambleLength; // Length of sync preamble
98 | uint16_t tailLength; // Length of transmission tail
99 |
100 | // Modulation values
101 | uint8_t sampleIndex; // Current sample index for outgoing bit
102 | uint8_t currentOutputByte; // Current byte to be modulated
103 | uint8_t txBit; // Mask of current modulated bit
104 | bool bitStuff; // Whether bitstuffing is allowed
105 |
106 | uint8_t bitstuffCount; // Counter for bit-stuffing
107 |
108 | uint16_t phaseAcc; // Phase accumulator
109 | uint16_t phaseInc; // Phase increment per sample
110 |
111 | uint8_t silentSamples; // How many samples were completely silent
112 |
113 | FIFOBuffer txFifo; // FIFO for transmit data
114 | uint8_t txBuf[CONFIG_AFSK_TX_BUFLEN]; // Actual data storage for said FIFO
115 |
116 | volatile bool sending; // Set when modem is sending
117 | volatile bool sending_data; // Set when modem is sending data
118 |
119 | // Demodulation values
120 | FIFOBuffer delayFifo; // Delayed FIFO for frequency discrimination
121 | int8_t delayBuf[SAMPLESPERBIT / 2 + 1]; // Actual data storage for said FIFO
122 |
123 | FIFOBuffer rxFifo; // FIFO for received data
124 | uint8_t rxBuf[CONFIG_AFSK_RX_BUFLEN]; // Actual data storage for said FIFO
125 |
126 | int16_t iirX[2]; // IIR Filter X cells
127 | int16_t iirY[2]; // IIR Filter Y cells
128 |
129 | uint8_t sampledBits; // Bits sampled by the demodulator (at ADC speed)
130 | int8_t currentPhase; // Current phase of the demodulator
131 | uint8_t actualBits; // Actual found bits at correct bitrate
132 |
133 | volatile int status; // Status of the modem, 0 means OK
134 |
135 | } Afsk;
136 |
137 | #define DIV_ROUND(dividend, divisor) (((dividend) + (divisor) / 2) / (divisor))
138 | #define MARK_INC (uint16_t)(DIV_ROUND(SIN_LEN * (uint32_t)MARK_FREQ, CONFIG_AFSK_DAC_SAMPLERATE))
139 | #define SPACE_INC (uint16_t)(DIV_ROUND(SIN_LEN * (uint32_t)SPACE_FREQ, CONFIG_AFSK_DAC_SAMPLERATE))
140 |
141 | #define AFSK_DAC_IRQ_START() do { extern bool hw_afsk_dac_isr; hw_afsk_dac_isr = true; } while (0)
142 | #define AFSK_DAC_IRQ_STOP() do { extern bool hw_afsk_dac_isr; hw_afsk_dac_isr = false; } while (0)
143 | #define AFSK_DAC_INIT() do { DAC_DDR |= 0xF8; } while (0)
144 |
145 | // Here's some macros for controlling the RX/TX LEDs
146 | // THE _INIT() functions writes to the DDRB register
147 | // to configure the pins as output pins, and the _ON()
148 | // and _OFF() functions writes to the PORT registers
149 | // to turn the pins on or off.
150 | #define LED_TX_INIT() do { LED_DDR |= _BV(1); } while (0)
151 | #define LED_TX_ON() do { LED_PORT |= _BV(1); } while (0)
152 | #define LED_TX_OFF() do { LED_PORT &= ~_BV(1); } while (0)
153 |
154 | #define LED_RX_INIT() do { LED_DDR |= _BV(2); } while (0)
155 | #define LED_RX_ON() do { LED_PORT |= _BV(2); } while (0)
156 | #define LED_RX_OFF() do { LED_PORT &= ~_BV(2); } while (0)
157 |
158 | void AFSK_init(Afsk *afsk);
159 | void AFSK_transmit(char *buffer, size_t size);
160 | void AFSK_poll(Afsk *afsk);
161 |
162 | #endif
--------------------------------------------------------------------------------
/hardware/Serial.c:
--------------------------------------------------------------------------------
1 | #include "Serial.h"
2 | #include
3 | #include
4 | #include
5 |
6 | void serial_init(Serial *serial) {
7 | memset(serial, 0, sizeof(*serial));
8 | UBRR0H = UBRRH_VALUE;
9 | UBRR0L = UBRRL_VALUE;
10 |
11 | #if USE_2X
12 | UCSR0A |= _BV(U2X0);
13 | #else
14 | UCSR0A &= ~(_BV(U2X0));
15 | #endif
16 |
17 | // Set to 8-bit data, enable RX and TX
18 | UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
19 | UCSR0B = _BV(RXEN0) | _BV(TXEN0);
20 |
21 | FILE uart0_fd = FDEV_SETUP_STREAM(uart0_putchar, uart0_getchar, _FDEV_SETUP_RW);
22 | //FILE uart0_fd = FDEV_SETUP_STREAM(uart0_putchar, NULL, _FDEV_SETUP_WRITE);
23 |
24 | serial->uart0 = uart0_fd;
25 | }
26 |
27 | bool serial_available(uint8_t index) {
28 | if (index == 0) {
29 | if (UCSR0A & _BV(RXC0)) return true;
30 | }
31 | return false;
32 | }
33 |
34 |
35 | int uart0_putchar(char c, FILE *stream) {
36 | loop_until_bit_is_set(UCSR0A, UDRE0);
37 | UDR0 = c;
38 | return 1;
39 | }
40 |
41 | int uart0_getchar(FILE *stream) {
42 | loop_until_bit_is_set(UCSR0A, RXC0);
43 | return UDR0;
44 | }
45 |
46 | char uart0_getchar_nowait(void) {
47 | if (!(UCSR0A & _BV(RXC0))) return EOF;
48 | return UDR0;
49 | }
--------------------------------------------------------------------------------
/hardware/Serial.h:
--------------------------------------------------------------------------------
1 | #ifndef SERIAL_H
2 | #define SERIAL_H
3 |
4 | #include "device.h"
5 |
6 | #include
7 | #include
8 | #include
9 |
10 | typedef struct Serial {
11 | FILE uart0;
12 | } Serial;
13 |
14 | void serial_init(Serial *serial);
15 | bool serial_available(uint8_t index);
16 | int uart0_putchar(char c, FILE *stream);
17 | int uart0_getchar(FILE *stream);
18 | char uart0_getchar_nowait(void);
19 |
20 | #endif
--------------------------------------------------------------------------------
/images/.keepdir:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/markqvist/MicroModemGP/2d54dea9a54b289ca6e6d300e2f9410e02f80d8c/images/.keepdir
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/main.c:
--------------------------------------------------------------------------------
1 | #include
2 | #include
3 | #include
4 |
5 | #include "device.h"
6 | #include "config.h"
7 | #include "util/FIFO.h"
8 | #include "util/time.h"
9 | #include "hardware/AFSK.h"
10 | #include "hardware/Serial.h"
11 | #include "protocol/AX25.h"
12 | #include "protocol/LLP.h"
13 | #include "protocol/KISS.h"
14 |
15 |
16 | Serial serial;
17 | Afsk modem;
18 | LLPAddress localAdress;
19 | LLPCtx llp;
20 |
21 | static void llp_callback(struct LLPCtx *ctx) {
22 | kiss_messageCallback(ctx);
23 | }
24 |
25 | void init(void) {
26 | sei();
27 |
28 | AFSK_init(&modem);
29 |
30 | memset(&localAdress, 0, sizeof(localAdress));
31 | localAdress.network = LLP_ADDR_BROADCAST;
32 | localAdress.host = LLP_ADDR_BROADCAST;
33 | llp_init(&llp, &localAdress, &modem.fd, llp_callback);
34 |
35 | serial_init(&serial);
36 | stdout = &serial.uart0;
37 | stdin = &serial.uart0;
38 |
39 | kiss_init(&llp, &modem, &serial);
40 | }
41 |
42 | int main (void) {
43 | init();
44 |
45 | while (true) {
46 | llp_poll(&llp);
47 |
48 | if (serial_available(0)) {
49 | char sbyte = uart0_getchar_nowait();
50 | kiss_serialCallback(sbyte);
51 | }
52 | #if SERIAL_FRAMING == SERIAL_FRAMING_DIRECT
53 | kiss_checkTimeout(false);
54 | #endif
55 | }
56 |
57 | return(0);
58 | }
--------------------------------------------------------------------------------
/precompiled/MicroModemGP-direct.hex:
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689 |
--------------------------------------------------------------------------------
/protocol/AX25.c:
--------------------------------------------------------------------------------
1 | // Based on work by Francesco Sacchi
2 |
3 | #include
4 | #include
5 | #include "AX25.h"
6 | #include "protocol/HDLC.h"
7 | #include "util/CRC-CCIT.h"
8 | #include "../hardware/AFSK.h"
9 |
10 | #define countof(a) sizeof(a)/sizeof(a[0])
11 | #define MIN(a,b) ({ typeof(a) _a = (a); typeof(b) _b = (b); ((typeof(_a))((_a < _b) ? _a : _b)); })
12 | #define DECODE_CALL(buf, addr) for (unsigned i = 0; i < sizeof((addr)); i++) { char c = (*(buf)++ >> 1); (addr)[i] = (c == ' ') ? '\x0' : c; }
13 | #define AX25_SET_REPEATED(msg, idx, val) do { if (val) { (msg)->rpt_flags |= _BV(idx); } else { (msg)->rpt_flags &= ~_BV(idx) ; } } while(0)
14 |
15 | void ax25_init(AX25Ctx *ctx, FILE *channel, ax25_callback_t hook) {
16 | memset(ctx, 0, sizeof(*ctx));
17 | ctx->ch = channel;
18 | ctx->hook = hook;
19 | ctx->crc_in = ctx->crc_out = CRC_CCIT_INIT_VAL;
20 | }
21 |
22 | static void ax25_decode(AX25Ctx *ctx) {
23 | #if SERIAL_PROTOCOL == PROTOCOL_KISS
24 | if (ctx->hook) ctx->hook(ctx);
25 | #endif
26 | }
27 |
28 | void ax25_poll(AX25Ctx *ctx) {
29 | int c;
30 |
31 | while ((c = fgetc(ctx->ch)) != EOF) {
32 | if (!ctx->escape && c == HDLC_FLAG) {
33 | if (ctx->frame_len >= AX25_MIN_FRAME_LEN) {
34 | if (ctx->crc_in == AX25_CRC_CORRECT) {
35 | #if OPEN_SQUELCH == true
36 | LED_RX_ON();
37 | #endif
38 | ax25_decode(ctx);
39 | }
40 | }
41 | ctx->sync = true;
42 | ctx->crc_in = CRC_CCIT_INIT_VAL;
43 | ctx->frame_len = 0;
44 | continue;
45 | }
46 |
47 | if (!ctx->escape && c == HDLC_RESET) {
48 | ctx->sync = false;
49 | continue;
50 | }
51 |
52 | if (!ctx->escape && c == AX25_ESC) {
53 | ctx->escape = true;
54 | continue;
55 | }
56 |
57 | if (ctx->sync) {
58 | if (ctx->frame_len < AX25_MAX_FRAME_LEN) {
59 | ctx->buf[ctx->frame_len++] = c;
60 | ctx->crc_in = update_crc_ccit(c, ctx->crc_in);
61 | } else {
62 | ctx->sync = false;
63 | }
64 | }
65 | ctx->escape = false;
66 | }
67 | }
68 |
69 | static void ax25_putchar(AX25Ctx *ctx, uint8_t c)
70 | {
71 | if (c == HDLC_FLAG || c == HDLC_RESET || c == AX25_ESC) fputc(AX25_ESC, ctx->ch);
72 | ctx->crc_out = update_crc_ccit(c, ctx->crc_out);
73 | fputc(c, ctx->ch);
74 | }
75 |
76 | void ax25_sendRaw(AX25Ctx *ctx, void *_buf, size_t len) {
77 | ctx->crc_out = CRC_CCIT_INIT_VAL;
78 | fputc(HDLC_FLAG, ctx->ch);
79 | const uint8_t *buf = (const uint8_t *)_buf;
80 | while (len--) ax25_putchar(ctx, *buf++);
81 |
82 | uint8_t crcl = (ctx->crc_out & 0xff) ^ 0xff;
83 | uint8_t crch = (ctx->crc_out >> 8) ^ 0xff;
84 | ax25_putchar(ctx, crcl);
85 | ax25_putchar(ctx, crch);
86 |
87 | fputc(HDLC_FLAG, ctx->ch);
88 | }
89 |
--------------------------------------------------------------------------------
/protocol/AX25.h:
--------------------------------------------------------------------------------
1 | #ifndef PROTOCOL_AX25_H
2 | #define PROTOCOL_AX25_H
3 |
4 | #include
5 | #include
6 | #include "device.h"
7 |
8 | #define AX25_MIN_FRAME_LEN 18
9 | #ifndef CUSTOM_FRAME_SIZE
10 | #define AX25_MAX_FRAME_LEN 620
11 | #else
12 | #define AX25_MAX_FRAME_LEN CUSTOM_FRAME_SIZE
13 | #endif
14 |
15 | #define AX25_CRC_CORRECT 0xF0B8
16 |
17 | #define AX25_CTRL_UI 0x03
18 | #define AX25_PID_NOLAYER3 0xF0
19 |
20 | struct AX25Ctx; // Forward declarations
21 | struct AX25Msg;
22 |
23 | typedef void (*ax25_callback_t)(struct AX25Ctx *ctx);
24 |
25 | typedef struct AX25Ctx {
26 | uint8_t buf[AX25_MAX_FRAME_LEN];
27 | FILE *ch;
28 | size_t frame_len;
29 | uint16_t crc_in;
30 | uint16_t crc_out;
31 | ax25_callback_t hook;
32 | bool sync;
33 | bool escape;
34 | } AX25Ctx;
35 |
36 | void ax25_poll(AX25Ctx *ctx);
37 | void ax25_sendRaw(AX25Ctx *ctx, void *_buf, size_t len);
38 | void ax25_init(AX25Ctx *ctx, FILE *channel, ax25_callback_t hook);
39 |
40 | #endif
--------------------------------------------------------------------------------
/protocol/HDLC.h:
--------------------------------------------------------------------------------
1 | #ifndef PROTOCOL_HDLC_H
2 | #define PROTOCOL_HDLC_H
3 |
4 | #define HDLC_FLAG 0x7E
5 | #define HDLC_RESET 0x7F
6 | #define LLP_ESC 0x1B
7 |
8 | #endif
--------------------------------------------------------------------------------
/protocol/KISS.c:
--------------------------------------------------------------------------------
1 | #include
2 | #include
3 |
4 | #include "device.h"
5 | #include "KISS.h"
6 |
7 | static uint8_t serialBuffer[LLP_MAX_DATA_SIZE]; // Buffer for holding incoming serial data
8 | LLPCtx *llpCtx;
9 | Afsk *channel;
10 | Serial *serial;
11 | size_t frame_len;
12 | bool IN_FRAME;
13 | bool ESCAPE;
14 | bool FLOWCONTROL;
15 |
16 | uint8_t command = CMD_UNKNOWN;
17 | unsigned long custom_preamble = CONFIG_AFSK_PREAMBLE_LEN;
18 | unsigned long custom_tail = CONFIG_AFSK_TRAILER_LEN;
19 |
20 | unsigned long slotTime = 200;
21 | uint8_t p = 255;
22 | ticks_t timeout_ticks;
23 |
24 | void kiss_init(LLPCtx *ctx, Afsk *afsk, Serial *ser) {
25 | llpCtx = ctx;
26 | serial = ser;
27 | channel = afsk;
28 | FLOWCONTROL = false;
29 | }
30 |
31 | void kiss_messageCallback(LLPCtx *ctx) {
32 | #if (SERIAL_FRAMING == SERIAL_FRAMING_DIRECT)
33 | for (unsigned i = 0; i < ctx->frame_len; i++) {
34 | uint8_t b = ctx->buf[i];
35 | fputc(b, &serial->uart0);
36 | }
37 | #else
38 | fputc(FEND, &serial->uart0);
39 | fputc(0x00, &serial->uart0);
40 | for (unsigned i = 0; i < ctx->frame_len; i++) {
41 | uint8_t b = ctx->buf[i];
42 | if (b == FEND) {
43 | fputc(FESC, &serial->uart0);
44 | fputc(TFEND, &serial->uart0);
45 | } else if (b == FESC) {
46 | fputc(FESC, &serial->uart0);
47 | fputc(TFESC, &serial->uart0);
48 | } else {
49 | fputc(b, &serial->uart0);
50 | }
51 | }
52 | fputc(FEND, &serial->uart0);
53 | #endif
54 | }
55 |
56 | void kiss_csma(LLPCtx *ctx, uint8_t *buf, size_t len) {
57 | bool sent = false;
58 | while (!sent) {
59 | //puts("Waiting in CSMA");
60 | if(!channel->hdlc.receiving) {
61 | uint8_t tp = rand() & 0xFF;
62 | if (tp < p) {
63 | //llp_sendRaw(ctx, buf, len);
64 | llp_broadcast(ctx, buf, len);
65 | sent = true;
66 | } else {
67 | ticks_t start = timer_clock();
68 | long slot_ticks = ms_to_ticks(slotTime);
69 | while (timer_clock() - start < slot_ticks) {
70 | cpu_relax();
71 | }
72 | }
73 | } else {
74 | while (!sent && channel->hdlc.receiving) {
75 | // Continously poll the modem for data
76 | // while waiting, so we don't overrun
77 | // receive buffers
78 | llp_poll(llpCtx);
79 |
80 | if (channel->status != 0) {
81 | // If an overflow or other error
82 | // occurs, we'll back off and drop
83 | // this packet silently.
84 | channel->status = 0;
85 | sent = true;
86 | }
87 | }
88 | }
89 | }
90 |
91 | if (FLOWCONTROL) {
92 | while (!ctx->ready_for_data) { /* Wait */ }
93 | fputc(FEND, &serial->uart0);
94 | fputc(CMD_READY, &serial->uart0);
95 | fputc(0x01, &serial->uart0);
96 | fputc(FEND, &serial->uart0);
97 | }
98 | }
99 |
100 | void kiss_checkTimeout(bool force) {
101 | if (force || (IN_FRAME && timer_clock() - timeout_ticks > ms_to_ticks(TX_MAXWAIT))) {
102 | kiss_csma(llpCtx, serialBuffer, frame_len);
103 | IN_FRAME = false;
104 | frame_len = 0;
105 | }
106 |
107 | }
108 |
109 | void kiss_serialCallback(uint8_t sbyte) {
110 | #if SERIAL_FRAMING == SERIAL_FRAMING_DIRECT
111 | timeout_ticks = timer_clock();
112 | IN_FRAME = true;
113 | serialBuffer[frame_len++] = sbyte;
114 | if (frame_len >= LLP_MAX_DATA_SIZE) kiss_checkTimeout(true);
115 | #else
116 | if (IN_FRAME && sbyte == FEND && command == CMD_DATA) {
117 | IN_FRAME = false;
118 | kiss_csma(llpCtx, serialBuffer, frame_len);
119 | } else if (sbyte == FEND) {
120 | IN_FRAME = true;
121 | command = CMD_UNKNOWN;
122 | frame_len = 0;
123 | } else if (IN_FRAME && frame_len < LLP_MAX_DATA_SIZE) {
124 | // Have a look at the command byte first
125 | if (frame_len == 0 && command == CMD_UNKNOWN) {
126 | // MicroModem supports only one HDLC port, so we
127 | // strip off the port nibble of the command byte
128 | sbyte = sbyte & 0x0F;
129 | command = sbyte;
130 | } else if (command == CMD_DATA) {
131 | if (sbyte == FESC) {
132 | ESCAPE = true;
133 | } else {
134 | if (ESCAPE) {
135 | if (sbyte == TFEND) sbyte = FEND;
136 | if (sbyte == TFESC) sbyte = FESC;
137 | ESCAPE = false;
138 | }
139 | serialBuffer[frame_len++] = sbyte;
140 | }
141 | } else if (command == CMD_TXDELAY) {
142 | custom_preamble = sbyte * 10UL;
143 | } else if (command == CMD_TXTAIL) {
144 | custom_tail = sbyte * 10;
145 | } else if (command == CMD_SLOTTIME) {
146 | slotTime = sbyte * 10;
147 | } else if (command == CMD_P) {
148 | p = sbyte;
149 | } else if (command == CMD_READY) {
150 | if (sbyte == 0x00) {
151 | FLOWCONTROL = false;
152 | } else {
153 | FLOWCONTROL = true;
154 | }
155 | }
156 |
157 | }
158 | #endif
159 | }
--------------------------------------------------------------------------------
/protocol/KISS.h:
--------------------------------------------------------------------------------
1 | #ifndef _PROTOCOL_KISS
2 | #define _PROTOCOL_KISS 0x02
3 |
4 | #include "../hardware/AFSK.h"
5 | #include "../hardware/Serial.h"
6 | #include "../util/time.h"
7 | #include "LLP.h"
8 | #include "config.h"
9 |
10 | #define FEND 0xC0
11 | #define FESC 0xDB
12 | #define TFEND 0xDC
13 | #define TFESC 0xDD
14 |
15 | #define CMD_UNKNOWN 0xFE
16 | #define CMD_DATA 0x00
17 | #define CMD_TXDELAY 0x01
18 | #define CMD_P 0x02
19 | #define CMD_SLOTTIME 0x03
20 | #define CMD_TXTAIL 0x04
21 | #define CMD_FULLDUPLEX 0x05
22 | #define CMD_SETHARDWARE 0x06
23 | #define CMD_READY 0x0F
24 | #define CMD_RETURN 0xFF
25 |
26 | void kiss_init(LLPCtx *ctx, Afsk *afsk, Serial *ser);
27 | void kiss_csma(LLPCtx *ctx, uint8_t *buf, size_t len);
28 | void kiss_messageCallback(LLPCtx *ctx);
29 | void kiss_serialCallback(uint8_t sbyte);
30 | void kiss_checkTimeout(bool force);
31 |
32 | #endif
--------------------------------------------------------------------------------
/protocol/LLP.c:
--------------------------------------------------------------------------------
1 | #include
2 | #include
3 | #include "LLP.h"
4 | #include "protocol/HDLC.h"
5 | #include "util/CRC-CCIT.h"
6 | #include "../hardware/AFSK.h"
7 |
8 | #define DISABLE_INTERLEAVE false
9 | #define PASSALL false
10 | #define STRIP_HEADERS true
11 |
12 | // The GET_BIT macro is used in the interleaver
13 | // and deinterleaver to access single bits of a
14 | // byte.
15 | inline bool GET_BIT(uint8_t byte, int n) { return (byte & (1 << (8-n))) == (1 << (8-n)); }
16 |
17 | // We need an indicator to tell us whether we
18 | // should send a parity byte. This happens
19 | // whenever two normal bytes of data has been
20 | // sent. We also keep the last sent byte in
21 | // memory because we need it to calculate the
22 | // parity byte.
23 | static bool sendParityBlock = false;
24 | static uint8_t lastByte = 0x00;
25 |
26 | LLPAddress broadcast_address;
27 |
28 | void llp_decode(LLPCtx *ctx) {
29 | if (ctx->hook) {
30 | size_t length = ctx->frame_len;
31 | uint8_t *buffer = (uint8_t*)&ctx->buf;
32 | size_t padding = buffer[LLP_HEADER_SIZE-1];
33 | size_t address_size = 2*sizeof(LLPAddress);
34 | #if STRIP_HEADERS
35 | uint8_t strip_headers = 1;
36 | #else
37 | uint8_t strip_headers = 0;
38 | #endif
39 | size_t subtraction = (address_size + (LLP_HEADER_SIZE - address_size))*strip_headers + padding;
40 | ctx->frame_len = length - subtraction - LLP_CHECKSUM_SIZE;
41 |
42 | for (int i = 0; i < ctx->frame_len; i++) {
43 | #if STRIP_HEADERS
44 | buffer[i] = buffer[i+subtraction];
45 | #else
46 | if ( i >= LLP_HEADER_SIZE ) {
47 | buffer[i] = buffer[i+padding];
48 | } else {
49 | buffer[i] = buffer[i];
50 | }
51 | #endif
52 | }
53 |
54 | ctx->hook(ctx);
55 | }
56 | }
57 |
58 | void llp_poll(LLPCtx *ctx) {
59 | int c;
60 |
61 | #if DISABLE_INTERLEAVE
62 | while ((c = fgetc(ctx->ch)) != EOF) {
63 | if (!ctx->escape && c == HDLC_FLAG) {
64 | if (ctx->frame_len >= LLP_MIN_FRAME_LENGTH) {
65 | if (PASSALL || ctx->crc_in == LLP_CRC_CORRECT) {
66 | #if OPEN_SQUELCH == true
67 | LED_RX_ON();
68 | #endif
69 | llp_decode(ctx);
70 | }
71 | }
72 | ctx->sync = true;
73 | ctx->crc_in = CRC_CCIT_INIT_VAL;
74 | ctx->frame_len = 0;
75 | continue;
76 | }
77 |
78 | if (!ctx->escape && c == HDLC_RESET) {
79 | ctx->sync = false;
80 | continue;
81 | }
82 |
83 | if (!ctx->escape && c == LLP_ESC) {
84 | ctx->escape = true;
85 | continue;
86 | }
87 |
88 | if (ctx->sync) {
89 | if (ctx->frame_len < LLP_MAX_FRAME_LENGTH) {
90 | ctx->buf[ctx->frame_len++] = c;
91 | ctx->crc_in = update_crc_ccit(c, ctx->crc_in);
92 | } else {
93 | ctx->sync = false;
94 | }
95 | }
96 | ctx->escape = false;
97 | }
98 | #else
99 | while ((c = fgetc(ctx->ch)) != EOF) {
100 |
101 | /////////////////////////////////////////////
102 | // Start of forward error correction block //
103 | /////////////////////////////////////////////
104 | if ((ctx->sync && (c != LLP_ESC )) || (ctx->sync && (ctx->escape && (c == LLP_ESC || c == HDLC_FLAG || c == HDLC_RESET)))) {
105 | // We have a byte, increment our read counter
106 | ctx->readLength++;
107 |
108 | // Check if we have read 12 bytes. If we
109 | // have, we should now have a block of two
110 | // data bytes and a parity byte. This block
111 | if (ctx->readLength % LLP_INTERLEAVE_SIZE == 0) {
112 | // If the last character in the block
113 | // looks like a control character, we
114 | // need to set the escape indicator to
115 | // false, since the next byte will be
116 | // read immediately after the FEC
117 | // routine, and thus, the normal reading
118 | // code will not reset the indicator.
119 | if (c == LLP_ESC || c == HDLC_FLAG || c == HDLC_RESET) ctx->escape = false;
120 |
121 | // The block is interleaved, so we will
122 | // first put the received bytes in the
123 | // deinterleaving buffer
124 | for (int i = 1; i < LLP_INTERLEAVE_SIZE; i++) {
125 | ctx->interleaveIn[i-1] = ctx->buf[ctx->frame_len-(LLP_INTERLEAVE_SIZE-i)];
126 | }
127 | ctx->interleaveIn[LLP_INTERLEAVE_SIZE-1] = c;
128 |
129 | // We then deinterleave the block
130 | llpDeinterleave(ctx);
131 |
132 | // Adjust the packet length, since we will get
133 | // parity bytes in the data buffer with block
134 | // sizes larger than 3
135 | ctx->frame_len -= LLP_INTERLEAVE_SIZE/3 - 1;
136 |
137 | // For each 3-byte block in the deinterleaved
138 | // bytes, we apply forward error correction
139 | for (int i = 0; i < LLP_INTERLEAVE_SIZE; i+=3) {
140 | // We now calculate a parity byte on the
141 | // received data.
142 |
143 | // Deinterleaved data bytes
144 | uint8_t a = ctx->interleaveIn[i];
145 | uint8_t b = ctx->interleaveIn[i+1];
146 |
147 | // Deinterleaved parity byte
148 | uint8_t p = ctx->interleaveIn[i+2];
149 |
150 | ctx->calculatedParity = llpParityBlock(a, b);
151 |
152 | // By XORing the calculated parity byte
153 | // with the received parity byte, we get
154 | // what is called the "syndrome". This
155 | // number will tell us if we had any
156 | // errors during transmission, and if so
157 | // where they are. Using Hamming code, we
158 | // can only detect single bit errors in a
159 | // byte though, which is why we interleave
160 | // the data, since most errors will usually
161 | // occur in bursts of more than one bit.
162 | // With 2 data byte interleaving we can
163 | // correct 2 consecutive bit errors.
164 | uint8_t syndrome = ctx->calculatedParity ^ p;
165 | if (syndrome == 0x00) {
166 | // If the syndrome equals 0, we either
167 | // don't have any errors, or the error
168 | // is unrecoverable, so we don't do
169 | // anything
170 | } else {
171 | // If the syndrome is not equal to 0,
172 | // there is a problem, and we will try
173 | // to correct it. We first need to split
174 | // the syndrome byte up into the two
175 | // actual syndrome numbers, one for
176 | // each data byte.
177 | uint8_t syndromes[2];
178 | syndromes[0] = syndrome & 0x0f;
179 | syndromes[1] = (syndrome & 0xf0) >> 4;
180 |
181 | // Then we look at each syndrome number
182 | // to determine what bit in the data
183 | // bytes to correct.
184 | for (int i = 0; i < 2; i++) {
185 | uint8_t s = syndromes[i];
186 | uint8_t correction = 0x00;
187 | if (s == 1 || s == 2 || s == 4 || s == 8) {
188 | // This signifies an error in the
189 | // parity block, so we actually
190 | // don't need any correction
191 | continue;
192 | }
193 |
194 | // The following determines what
195 | // bit to correct according to
196 | // the syndrome value.
197 | if (s == 3) correction = 0x01;
198 | if (s == 5) correction = 0x02;
199 | if (s == 6) correction = 0x04;
200 | if (s == 7) correction = 0x08;
201 | if (s == 9) correction = 0x10;
202 | if (s == 10) correction = 0x20;
203 | if (s == 11) correction = 0x40;
204 | if (s == 12) correction = 0x80;
205 |
206 | // And finally we apply the correction
207 | if (i == 1) a ^= correction;
208 | if (i == 0) b ^= correction;
209 |
210 | // This is just for testing purposes.
211 | // Nice to know when corrections were
212 | // actually made.
213 | if (s != 0) ctx->correctionsMade += 1;
214 | }
215 | }
216 |
217 | // We now update the checksum of the packet
218 | // with the deinterleaved and possibly
219 | // corrected bytes.
220 |
221 | ctx->crc_in = update_crc_ccit(a, ctx->crc_in);
222 | ctx->crc_in = update_crc_ccit(b, ctx->crc_in);
223 |
224 | ctx->buf[ctx->frame_len-(LLP_DATA_BLOCK_SIZE)+((i/3)*2)] = a;
225 | ctx->buf[ctx->frame_len-(LLP_DATA_BLOCK_SIZE-1)+((i/3)*2)] = b;
226 | }
227 |
228 | continue;
229 | }
230 | }
231 | /////////////////////////////////////////////
232 | // End of forward error correction block //
233 | /////////////////////////////////////////////
234 |
235 | if (!ctx->escape && c == HDLC_FLAG) {
236 | if (ctx->frame_len >= LLP_MIN_FRAME_LENGTH) {
237 | if (PASSALL || ctx->crc_in == LLP_CRC_CORRECT) {
238 | #if OPEN_SQUELCH == true
239 | LED_RX_ON();
240 | #endif
241 | llp_decode(ctx);
242 | }
243 | }
244 | ctx->sync = true;
245 | ctx->crc_in = CRC_CCIT_INIT_VAL;
246 | ctx->frame_len = 0;
247 | ctx->readLength = 0;
248 | ctx->correctionsMade = 0;
249 | continue;
250 | }
251 |
252 | if (!ctx->escape && c == HDLC_RESET) {
253 | ctx->sync = false;
254 | continue;
255 | }
256 |
257 | if (!ctx->escape && c == LLP_ESC) {
258 | ctx->escape = true;
259 | continue;
260 | }
261 |
262 | if (ctx->sync) {
263 | if (ctx->frame_len < LLP_MAX_FRAME_LENGTH) {
264 | ctx->buf[ctx->frame_len++] = c;
265 | } else {
266 | ctx->sync = false;
267 | }
268 | }
269 | ctx->escape = false;
270 | }
271 | #endif
272 | }
273 |
274 | static void llp_putchar(LLPCtx *ctx, uint8_t c) {
275 | if (c == HDLC_FLAG || c == HDLC_RESET || c == LLP_ESC) fputc(LLP_ESC, ctx->ch);
276 | fputc(c, ctx->ch);
277 | }
278 |
279 | static void llp_sendchar(LLPCtx *ctx, uint8_t c) {
280 | llpInterleave(ctx, c);
281 | ctx->crc_out = update_crc_ccit(c, ctx->crc_out);
282 |
283 | if (sendParityBlock) {
284 | uint8_t p = llpParityBlock(lastByte, c);
285 | llpInterleave(ctx, p);
286 | }
287 |
288 | lastByte = c;
289 | sendParityBlock ^= true;
290 | }
291 |
292 | void llp_sendaddress(LLPCtx *ctx, LLPAddress *address) {
293 | llp_sendchar(ctx, address->network >> 8);
294 | llp_sendchar(ctx, address->network & 0xff);
295 | llp_sendchar(ctx, address->host >> 8);
296 | llp_sendchar(ctx, address->host & 0xff);
297 | }
298 |
299 | void llp_broadcast(LLPCtx *ctx, const void *_buf, size_t len) {
300 | llp_send(ctx, &broadcast_address, _buf, len);
301 | }
302 |
303 | void llp_send(LLPCtx *ctx, LLPAddress *dst, const void *_buf, size_t len) {
304 | ctx->ready_for_data = false;
305 | ctx->interleaveCounter = 0;
306 | ctx->crc_out = CRC_CCIT_INIT_VAL;
307 | uint8_t *buffer = (uint8_t*)_buf;
308 |
309 | LLPHeader header;
310 | memset(&header, 0, sizeof(header));
311 |
312 | LLPAddress *localAddress = ctx->address;
313 | header.src.network = localAddress->network;
314 | header.src.host = localAddress->host;
315 | header.dst.network = dst->network;
316 | header.dst.host = dst->host;
317 | header.flags = 0x00;
318 | header.padding = (len + LLP_HEADER_SIZE + LLP_CRC_SIZE) % LLP_DATA_BLOCK_SIZE;
319 | if (header.padding != 0) {
320 | header.padding = LLP_DATA_BLOCK_SIZE - header.padding;
321 | }
322 |
323 | // Transmit the HDLC_FLAG to signify start of TX
324 | fputc(HDLC_FLAG, ctx->ch);
325 |
326 | // Transmit source & destination addresses
327 | llp_sendaddress(ctx, &header.src);
328 | llp_sendaddress(ctx, &header.dst);
329 |
330 | // Transmit header flags & padding count
331 | llp_sendchar(ctx, header.flags);
332 | llp_sendchar(ctx, header.padding);
333 |
334 | // Transmit padding
335 | while (header.padding--) {
336 | llp_sendchar(ctx, 0x00);
337 | }
338 |
339 | // Transmit payload
340 | while (len--) {
341 | llp_sendchar(ctx, *buffer++);
342 | }
343 |
344 | // Send CRC checksum
345 | uint8_t crcl = (ctx->crc_out & 0xff) ^ 0xff;
346 | uint8_t crch = (ctx->crc_out >> 8) ^ 0xff;
347 | llp_sendchar(ctx, crcl);
348 | llp_sendchar(ctx, crch);
349 |
350 | // And transmit a HDLC_FLAG to signify
351 | // end of the transmission.
352 | fputc(HDLC_FLAG, ctx->ch);
353 | ctx->ready_for_data = true;
354 | }
355 |
356 | void llp_sendRaw(LLPCtx *ctx, const void *_buf, size_t len) {
357 | ctx->ready_for_data = false;
358 | ctx->crc_out = CRC_CCIT_INIT_VAL;
359 | fputc(HDLC_FLAG, ctx->ch);
360 | const uint8_t *buf = (const uint8_t *)_buf;
361 | while (len--) llp_putchar(ctx, *buf++);
362 |
363 | uint8_t crcl = (ctx->crc_out & 0xff) ^ 0xff;
364 | uint8_t crch = (ctx->crc_out >> 8) ^ 0xff;
365 | llp_putchar(ctx, crcl);
366 | llp_putchar(ctx, crch);
367 |
368 | fputc(HDLC_FLAG, ctx->ch);
369 |
370 | ctx->ready_for_data = true;
371 | }
372 |
373 | void llp_init(LLPCtx *ctx, LLPAddress *address, FILE *channel, llp_callback_t hook) {
374 | memset(ctx, 0, sizeof(*ctx));
375 | ctx->ch = channel;
376 | ctx->hook = hook;
377 | ctx->address = address;
378 | ctx->crc_in = ctx->crc_out = CRC_CCIT_INIT_VAL;
379 | ctx->ready_for_data = true;
380 |
381 | memset(&broadcast_address, 0, sizeof(broadcast_address));
382 | broadcast_address.network = LLP_ADDR_BROADCAST;
383 | broadcast_address.host = LLP_ADDR_BROADCAST;
384 | }
385 |
386 | // This function calculates and returns a parity
387 | // byte for two input bytes. The parity byte is
388 | // used for correcting errors in the transmission.
389 | // The error correction algorithm is a standard
390 | // (12,8) Hamming code.
391 | inline bool BIT(uint8_t byte, int n) { return ((byte & _BV(n-1))>>(n-1)); }
392 | uint8_t llpParityBlock(uint8_t first, uint8_t other) {
393 | uint8_t parity = 0x00;
394 |
395 | parity = ((BIT(first, 1) ^ BIT(first, 2) ^ BIT(first, 4) ^ BIT(first, 5) ^ BIT(first, 7))) +
396 | ((BIT(first, 1) ^ BIT(first, 3) ^ BIT(first, 4) ^ BIT(first, 6) ^ BIT(first, 7))<<1) +
397 | ((BIT(first, 2) ^ BIT(first, 3) ^ BIT(first, 4) ^ BIT(first, 8))<<2) +
398 | ((BIT(first, 5) ^ BIT(first, 6) ^ BIT(first, 7) ^ BIT(first, 8))<<3) +
399 |
400 | ((BIT(other, 1) ^ BIT(other, 2) ^ BIT(other, 4) ^ BIT(other, 5) ^ BIT(other, 7))<<4) +
401 | ((BIT(other, 1) ^ BIT(other, 3) ^ BIT(other, 4) ^ BIT(other, 6) ^ BIT(other, 7))<<5) +
402 | ((BIT(other, 2) ^ BIT(other, 3) ^ BIT(other, 4) ^ BIT(other, 8))<<6) +
403 | ((BIT(other, 5) ^ BIT(other, 6) ^ BIT(other, 7) ^ BIT(other, 8))<<7);
404 |
405 | return parity;
406 | }
407 |
408 | // Following is the functions responsible
409 | // for interleaving and deinterleaving
410 | // blocks of data. The interleaving table
411 | // for 3-byte interleaving is also included.
412 | // The table for 12-byte is much simpler,
413 | // and should be inferable from looking
414 | // at the function.
415 |
416 | ///////////////////////////////
417 | // Interleave-table (3-byte) //
418 | ///////////////////////////////
419 | //
420 | // Non-interleaved:
421 | // aaaaaaaa bbbbbbbb cccccccc
422 | // 12345678 12345678 12345678
423 | // M L
424 | // S S
425 | // B B
426 | //
427 | // Interleaved:
428 | // abcabcab cabcabca bcabcabc
429 | // 11144477 22255578 63336688
430 | //
431 | ///////////////////////////////
432 |
433 | void llpInterleave(LLPCtx *ctx, uint8_t byte) {
434 | ctx->interleaveOut[ctx->interleaveCounter] = byte;
435 | ctx->interleaveCounter++;
436 | if (!DISABLE_INTERLEAVE) {
437 | if (ctx->interleaveCounter == LLP_INTERLEAVE_SIZE) {
438 | // We have the bytes we need for interleaving
439 | // in the buffer and are ready to interleave them.
440 |
441 | uint8_t a = (GET_BIT(ctx->interleaveOut[0], 1) << 7) +
442 | (GET_BIT(ctx->interleaveOut[1], 1) << 6) +
443 | (GET_BIT(ctx->interleaveOut[3], 1) << 5) +
444 | (GET_BIT(ctx->interleaveOut[4], 1) << 4) +
445 | (GET_BIT(ctx->interleaveOut[6], 1) << 3) +
446 | (GET_BIT(ctx->interleaveOut[7], 1) << 2) +
447 | (GET_BIT(ctx->interleaveOut[9], 1) << 1) +
448 | (GET_BIT(ctx->interleaveOut[10],1));
449 | llp_putchar(ctx, a);
450 |
451 | uint8_t b = (GET_BIT(ctx->interleaveOut[0], 2) << 7) +
452 | (GET_BIT(ctx->interleaveOut[1], 2) << 6) +
453 | (GET_BIT(ctx->interleaveOut[3], 2) << 5) +
454 | (GET_BIT(ctx->interleaveOut[4], 2) << 4) +
455 | (GET_BIT(ctx->interleaveOut[6], 2) << 3) +
456 | (GET_BIT(ctx->interleaveOut[7], 2) << 2) +
457 | (GET_BIT(ctx->interleaveOut[9], 2) << 1) +
458 | (GET_BIT(ctx->interleaveOut[10],2));
459 | llp_putchar(ctx, b);
460 |
461 | uint8_t c = (GET_BIT(ctx->interleaveOut[0], 3) << 7) +
462 | (GET_BIT(ctx->interleaveOut[1], 3) << 6) +
463 | (GET_BIT(ctx->interleaveOut[3], 3) << 5) +
464 | (GET_BIT(ctx->interleaveOut[4], 3) << 4) +
465 | (GET_BIT(ctx->interleaveOut[6], 3) << 3) +
466 | (GET_BIT(ctx->interleaveOut[7], 3) << 2) +
467 | (GET_BIT(ctx->interleaveOut[9], 3) << 1) +
468 | (GET_BIT(ctx->interleaveOut[10],3));
469 | llp_putchar(ctx, c);
470 |
471 | uint8_t d = (GET_BIT(ctx->interleaveOut[0], 4) << 7) +
472 | (GET_BIT(ctx->interleaveOut[1], 4) << 6) +
473 | (GET_BIT(ctx->interleaveOut[3], 4) << 5) +
474 | (GET_BIT(ctx->interleaveOut[4], 4) << 4) +
475 | (GET_BIT(ctx->interleaveOut[6], 4) << 3) +
476 | (GET_BIT(ctx->interleaveOut[7], 4) << 2) +
477 | (GET_BIT(ctx->interleaveOut[9], 4) << 1) +
478 | (GET_BIT(ctx->interleaveOut[10],4));
479 | llp_putchar(ctx, d);
480 |
481 | uint8_t e = (GET_BIT(ctx->interleaveOut[0], 5) << 7) +
482 | (GET_BIT(ctx->interleaveOut[1], 5) << 6) +
483 | (GET_BIT(ctx->interleaveOut[3], 5) << 5) +
484 | (GET_BIT(ctx->interleaveOut[4], 5) << 4) +
485 | (GET_BIT(ctx->interleaveOut[6], 5) << 3) +
486 | (GET_BIT(ctx->interleaveOut[7], 5) << 2) +
487 | (GET_BIT(ctx->interleaveOut[9], 5) << 1) +
488 | (GET_BIT(ctx->interleaveOut[10],5));
489 | llp_putchar(ctx, e);
490 |
491 | uint8_t f = (GET_BIT(ctx->interleaveOut[0], 6) << 7) +
492 | (GET_BIT(ctx->interleaveOut[1], 6) << 6) +
493 | (GET_BIT(ctx->interleaveOut[3], 6) << 5) +
494 | (GET_BIT(ctx->interleaveOut[4], 6) << 4) +
495 | (GET_BIT(ctx->interleaveOut[6], 6) << 3) +
496 | (GET_BIT(ctx->interleaveOut[7], 6) << 2) +
497 | (GET_BIT(ctx->interleaveOut[9], 6) << 1) +
498 | (GET_BIT(ctx->interleaveOut[10],6));
499 | llp_putchar(ctx, f);
500 |
501 | uint8_t g = (GET_BIT(ctx->interleaveOut[0], 7) << 7) +
502 | (GET_BIT(ctx->interleaveOut[1], 7) << 6) +
503 | (GET_BIT(ctx->interleaveOut[3], 7) << 5) +
504 | (GET_BIT(ctx->interleaveOut[4], 7) << 4) +
505 | (GET_BIT(ctx->interleaveOut[6], 7) << 3) +
506 | (GET_BIT(ctx->interleaveOut[7], 7) << 2) +
507 | (GET_BIT(ctx->interleaveOut[9], 7) << 1) +
508 | (GET_BIT(ctx->interleaveOut[10],7));
509 | llp_putchar(ctx, g);
510 |
511 | uint8_t h = (GET_BIT(ctx->interleaveOut[0], 8) << 7) +
512 | (GET_BIT(ctx->interleaveOut[1], 8) << 6) +
513 | (GET_BIT(ctx->interleaveOut[3], 8) << 5) +
514 | (GET_BIT(ctx->interleaveOut[4], 8) << 4) +
515 | (GET_BIT(ctx->interleaveOut[6], 8) << 3) +
516 | (GET_BIT(ctx->interleaveOut[7], 8) << 2) +
517 | (GET_BIT(ctx->interleaveOut[9], 8) << 1) +
518 | (GET_BIT(ctx->interleaveOut[10],8));
519 | llp_putchar(ctx, h);
520 |
521 | uint8_t p = (GET_BIT(ctx->interleaveOut[2], 1) << 7) +
522 | (GET_BIT(ctx->interleaveOut[2], 5) << 6) +
523 | (GET_BIT(ctx->interleaveOut[5], 1) << 5) +
524 | (GET_BIT(ctx->interleaveOut[5], 5) << 4) +
525 | (GET_BIT(ctx->interleaveOut[8], 1) << 3) +
526 | (GET_BIT(ctx->interleaveOut[8], 5) << 2) +
527 | (GET_BIT(ctx->interleaveOut[11],1) << 1) +
528 | (GET_BIT(ctx->interleaveOut[11],5));
529 | llp_putchar(ctx, p);
530 |
531 | uint8_t q = (GET_BIT(ctx->interleaveOut[2], 2) << 7) +
532 | (GET_BIT(ctx->interleaveOut[2], 6) << 6) +
533 | (GET_BIT(ctx->interleaveOut[5], 2) << 5) +
534 | (GET_BIT(ctx->interleaveOut[5], 6) << 4) +
535 | (GET_BIT(ctx->interleaveOut[8], 2) << 3) +
536 | (GET_BIT(ctx->interleaveOut[8], 6) << 2) +
537 | (GET_BIT(ctx->interleaveOut[11],2) << 1) +
538 | (GET_BIT(ctx->interleaveOut[11],6));
539 | llp_putchar(ctx, q);
540 |
541 | uint8_t s = (GET_BIT(ctx->interleaveOut[2], 3) << 7) +
542 | (GET_BIT(ctx->interleaveOut[2], 7) << 6) +
543 | (GET_BIT(ctx->interleaveOut[5], 3) << 5) +
544 | (GET_BIT(ctx->interleaveOut[5], 7) << 4) +
545 | (GET_BIT(ctx->interleaveOut[8], 3) << 3) +
546 | (GET_BIT(ctx->interleaveOut[8], 7) << 2) +
547 | (GET_BIT(ctx->interleaveOut[11],3) << 1) +
548 | (GET_BIT(ctx->interleaveOut[11],7));
549 | llp_putchar(ctx, s);
550 |
551 | uint8_t t = (GET_BIT(ctx->interleaveOut[2], 4) << 7) +
552 | (GET_BIT(ctx->interleaveOut[2], 8) << 6) +
553 | (GET_BIT(ctx->interleaveOut[5], 4) << 5) +
554 | (GET_BIT(ctx->interleaveOut[5], 8) << 4) +
555 | (GET_BIT(ctx->interleaveOut[8], 4) << 3) +
556 | (GET_BIT(ctx->interleaveOut[8], 8) << 2) +
557 | (GET_BIT(ctx->interleaveOut[11],4) << 1) +
558 | (GET_BIT(ctx->interleaveOut[11],8));
559 | llp_putchar(ctx, t);
560 |
561 | ctx->interleaveCounter = 0;
562 | }
563 | } else {
564 | if (ctx->interleaveCounter == LLP_INTERLEAVE_SIZE) {
565 | for (int i = 0; i < LLP_INTERLEAVE_SIZE; i++) {
566 | llp_putchar(ctx, ctx->interleaveOut[i]);
567 | }
568 | ctx->interleaveCounter = 0;
569 | }
570 |
571 | }
572 | }
573 |
574 |
575 | void llpDeinterleave(LLPCtx *ctx) {
576 | uint8_t a = (GET_BIT(ctx->interleaveIn[0], 1) << 7) +
577 | (GET_BIT(ctx->interleaveIn[1], 1) << 6) +
578 | (GET_BIT(ctx->interleaveIn[2], 1) << 5) +
579 | (GET_BIT(ctx->interleaveIn[3], 1) << 4) +
580 | (GET_BIT(ctx->interleaveIn[4], 1) << 3) +
581 | (GET_BIT(ctx->interleaveIn[5], 1) << 2) +
582 | (GET_BIT(ctx->interleaveIn[6], 1) << 1) +
583 | (GET_BIT(ctx->interleaveIn[7], 1));
584 |
585 | uint8_t b = (GET_BIT(ctx->interleaveIn[0], 2) << 7) +
586 | (GET_BIT(ctx->interleaveIn[1], 2) << 6) +
587 | (GET_BIT(ctx->interleaveIn[2], 2) << 5) +
588 | (GET_BIT(ctx->interleaveIn[3], 2) << 4) +
589 | (GET_BIT(ctx->interleaveIn[4], 2) << 3) +
590 | (GET_BIT(ctx->interleaveIn[5], 2) << 2) +
591 | (GET_BIT(ctx->interleaveIn[6], 2) << 1) +
592 | (GET_BIT(ctx->interleaveIn[7], 2));
593 |
594 | uint8_t p = (GET_BIT(ctx->interleaveIn[8], 1) << 7) +
595 | (GET_BIT(ctx->interleaveIn[9], 1) << 6) +
596 | (GET_BIT(ctx->interleaveIn[10],1) << 5) +
597 | (GET_BIT(ctx->interleaveIn[11],1) << 4) +
598 | (GET_BIT(ctx->interleaveIn[8], 2) << 3) +
599 | (GET_BIT(ctx->interleaveIn[9], 2) << 2) +
600 | (GET_BIT(ctx->interleaveIn[10],2) << 1) +
601 | (GET_BIT(ctx->interleaveIn[11],2));
602 |
603 | uint8_t c = (GET_BIT(ctx->interleaveIn[0], 3) << 7) +
604 | (GET_BIT(ctx->interleaveIn[1], 3) << 6) +
605 | (GET_BIT(ctx->interleaveIn[2], 3) << 5) +
606 | (GET_BIT(ctx->interleaveIn[3], 3) << 4) +
607 | (GET_BIT(ctx->interleaveIn[4], 3) << 3) +
608 | (GET_BIT(ctx->interleaveIn[5], 3) << 2) +
609 | (GET_BIT(ctx->interleaveIn[6], 3) << 1) +
610 | (GET_BIT(ctx->interleaveIn[7], 3));
611 |
612 | uint8_t d = (GET_BIT(ctx->interleaveIn[0], 4) << 7) +
613 | (GET_BIT(ctx->interleaveIn[1], 4) << 6) +
614 | (GET_BIT(ctx->interleaveIn[2], 4) << 5) +
615 | (GET_BIT(ctx->interleaveIn[3], 4) << 4) +
616 | (GET_BIT(ctx->interleaveIn[4], 4) << 3) +
617 | (GET_BIT(ctx->interleaveIn[5], 4) << 2) +
618 | (GET_BIT(ctx->interleaveIn[6], 4) << 1) +
619 | (GET_BIT(ctx->interleaveIn[7], 4));
620 |
621 | uint8_t q = (GET_BIT(ctx->interleaveIn[8], 3) << 7) +
622 | (GET_BIT(ctx->interleaveIn[9], 3) << 6) +
623 | (GET_BIT(ctx->interleaveIn[10],3) << 5) +
624 | (GET_BIT(ctx->interleaveIn[11],3) << 4) +
625 | (GET_BIT(ctx->interleaveIn[8], 4) << 3) +
626 | (GET_BIT(ctx->interleaveIn[9], 4) << 2) +
627 | (GET_BIT(ctx->interleaveIn[10],4) << 1) +
628 | (GET_BIT(ctx->interleaveIn[11],4));
629 |
630 | uint8_t e = (GET_BIT(ctx->interleaveIn[0], 5) << 7) +
631 | (GET_BIT(ctx->interleaveIn[1], 5) << 6) +
632 | (GET_BIT(ctx->interleaveIn[2], 5) << 5) +
633 | (GET_BIT(ctx->interleaveIn[3], 5) << 4) +
634 | (GET_BIT(ctx->interleaveIn[4], 5) << 3) +
635 | (GET_BIT(ctx->interleaveIn[5], 5) << 2) +
636 | (GET_BIT(ctx->interleaveIn[6], 5) << 1) +
637 | (GET_BIT(ctx->interleaveIn[7], 5));
638 |
639 | uint8_t f = (GET_BIT(ctx->interleaveIn[0], 6) << 7) +
640 | (GET_BIT(ctx->interleaveIn[1], 6) << 6) +
641 | (GET_BIT(ctx->interleaveIn[2], 6) << 5) +
642 | (GET_BIT(ctx->interleaveIn[3], 6) << 4) +
643 | (GET_BIT(ctx->interleaveIn[4], 6) << 3) +
644 | (GET_BIT(ctx->interleaveIn[5], 6) << 2) +
645 | (GET_BIT(ctx->interleaveIn[6], 6) << 1) +
646 | (GET_BIT(ctx->interleaveIn[7], 6));
647 |
648 | uint8_t s = (GET_BIT(ctx->interleaveIn[8], 5) << 7) +
649 | (GET_BIT(ctx->interleaveIn[9], 5) << 6) +
650 | (GET_BIT(ctx->interleaveIn[10],5) << 5) +
651 | (GET_BIT(ctx->interleaveIn[11],5) << 4) +
652 | (GET_BIT(ctx->interleaveIn[8], 6) << 3) +
653 | (GET_BIT(ctx->interleaveIn[9], 6) << 2) +
654 | (GET_BIT(ctx->interleaveIn[10],6) << 1) +
655 | (GET_BIT(ctx->interleaveIn[11],6));
656 |
657 | uint8_t g = (GET_BIT(ctx->interleaveIn[0], 7) << 7) +
658 | (GET_BIT(ctx->interleaveIn[1], 7) << 6) +
659 | (GET_BIT(ctx->interleaveIn[2], 7) << 5) +
660 | (GET_BIT(ctx->interleaveIn[3], 7) << 4) +
661 | (GET_BIT(ctx->interleaveIn[4], 7) << 3) +
662 | (GET_BIT(ctx->interleaveIn[5], 7) << 2) +
663 | (GET_BIT(ctx->interleaveIn[6], 7) << 1) +
664 | (GET_BIT(ctx->interleaveIn[7], 7));
665 |
666 | uint8_t h = (GET_BIT(ctx->interleaveIn[0], 8) << 7) +
667 | (GET_BIT(ctx->interleaveIn[1], 8) << 6) +
668 | (GET_BIT(ctx->interleaveIn[2], 8) << 5) +
669 | (GET_BIT(ctx->interleaveIn[3], 8) << 4) +
670 | (GET_BIT(ctx->interleaveIn[4], 8) << 3) +
671 | (GET_BIT(ctx->interleaveIn[5], 8) << 2) +
672 | (GET_BIT(ctx->interleaveIn[6], 8) << 1) +
673 | (GET_BIT(ctx->interleaveIn[7], 8));
674 |
675 | uint8_t t = (GET_BIT(ctx->interleaveIn[8], 7) << 7) +
676 | (GET_BIT(ctx->interleaveIn[9], 7) << 6) +
677 | (GET_BIT(ctx->interleaveIn[10],7) << 5) +
678 | (GET_BIT(ctx->interleaveIn[11],7) << 4) +
679 | (GET_BIT(ctx->interleaveIn[8], 8) << 3) +
680 | (GET_BIT(ctx->interleaveIn[9], 8) << 2) +
681 | (GET_BIT(ctx->interleaveIn[10],8) << 1) +
682 | (GET_BIT(ctx->interleaveIn[11],8));
683 |
684 | ctx->interleaveIn[0] = a;
685 | ctx->interleaveIn[1] = b;
686 | ctx->interleaveIn[2] = p;
687 | ctx->interleaveIn[3] = c;
688 | ctx->interleaveIn[4] = d;
689 | ctx->interleaveIn[5] = q;
690 | ctx->interleaveIn[6] = e;
691 | ctx->interleaveIn[7] = f;
692 | ctx->interleaveIn[8] = s;
693 | ctx->interleaveIn[9] = g;
694 | ctx->interleaveIn[10] = h;
695 | ctx->interleaveIn[11] = t;
696 | }
--------------------------------------------------------------------------------
/protocol/LLP.h:
--------------------------------------------------------------------------------
1 | #ifndef PROTOCOL_LLP_H
2 | #define PROTOCOL_LLP_H
3 |
4 | #include
5 | #include
6 | #include "device.h"
7 |
8 | #define LLP_ADDR_BROADCAST 0xFFFF
9 |
10 | #define LLP_INTERLEAVE_SIZE 12
11 | #define LLP_MIN_FRAME_LENGTH LLP_INTERLEAVE_SIZE
12 | #define LLP_MAX_FRAME_LENGTH 48 * LLP_INTERLEAVE_SIZE
13 | #define LLP_HEADER_SIZE 10
14 | #define LLP_CHECKSUM_SIZE 2
15 | #define LLP_MAX_DATA_SIZE LLP_MAX_FRAME_LENGTH - LLP_HEADER_SIZE - LLP_CHECKSUM_SIZE
16 | #define LLP_DATA_BLOCK_SIZE ((LLP_INTERLEAVE_SIZE/3)*2)
17 |
18 | #define LLP_CRC_SIZE 2
19 | #define LLP_CRC_CORRECT 0xF0B8
20 |
21 | struct LLPCtx; // Forward declarations
22 |
23 | typedef void (*llp_callback_t)(struct LLPCtx *ctx);
24 |
25 | typedef struct LLPAddress {
26 | uint16_t network;
27 | uint16_t host;
28 | } LLPAddress;
29 |
30 | typedef struct LLPHeader {
31 | LLPAddress src;
32 | LLPAddress dst;
33 | uint8_t flags;
34 | uint8_t padding;
35 | } LLPHeader;
36 |
37 | typedef struct LLPMsg {
38 | LLPHeader header;
39 | const uint8_t *data;
40 | size_t len;
41 | } LLPMsg;
42 |
43 | typedef struct LLPCtx {
44 | uint8_t buf[LLP_MAX_FRAME_LENGTH];
45 | FILE *ch;
46 | LLPAddress *address;
47 | size_t frame_len;
48 | size_t readLength;
49 | uint16_t crc_in;
50 | uint16_t crc_out;
51 | uint8_t calculatedParity;
52 | long correctionsMade;
53 | llp_callback_t hook;
54 | bool sync;
55 | bool escape;
56 | bool ready_for_data;
57 | uint8_t interleaveCounter; // Keeps track of when we have received an entire interleaved block
58 | uint8_t interleaveOut[LLP_INTERLEAVE_SIZE]; // A buffer for interleaving bytes before they are sent
59 | uint8_t interleaveIn[LLP_INTERLEAVE_SIZE]; // A buffer for storing interleaved bytes before they are deinterleaved
60 | } LLPCtx;
61 |
62 | void llp_broadcast(LLPCtx *ctx, const void *_buf, size_t len);
63 | void llp_send(LLPCtx *ctx, LLPAddress *dst, const void *_buf, size_t len);
64 | void llp_sendRaw(LLPCtx *ctx, const void *_buf, size_t len);
65 | void llp_poll(LLPCtx *ctx);
66 | void llp_init(LLPCtx *ctx, LLPAddress *address, FILE *channel, llp_callback_t hook);
67 |
68 | void llpInterleave(LLPCtx *ctx, uint8_t byte);
69 | void llpDeinterleave(LLPCtx *ctx);
70 | uint8_t llpParityBlock(uint8_t first, uint8_t other);
71 |
72 | #endif
--------------------------------------------------------------------------------
/util/CRC-CCIT.c:
--------------------------------------------------------------------------------
1 | #include "CRC-CCIT.h"
2 |
3 | const uint16_t crc_ccit_table[256] PROGMEM = {
4 | 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
5 | 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
6 | 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
7 | 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
8 | 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
9 | 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
10 | 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
11 | 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
12 | 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
13 | 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
14 | 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
15 | 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
16 | 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
17 | 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
18 | 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
19 | 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
20 | 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
21 | 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
22 | 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
23 | 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
24 | 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
25 | 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
26 | 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
27 | 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
28 | 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
29 | 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
30 | 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
31 | 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
32 | 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
33 | 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
34 | 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
35 | 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78,
36 | };
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/util/CRC-CCIT.h:
--------------------------------------------------------------------------------
1 | // CRC-CCIT Implementation based on work by Francesco Sacchi
2 |
3 | #ifndef CRC_CCIT_H
4 | #define CRC_CCIT_H
5 |
6 | #include
7 | #include
8 |
9 | #define CRC_CCIT_INIT_VAL ((uint16_t)0xFFFF)
10 |
11 | extern const uint16_t crc_ccit_table[256];
12 |
13 | inline uint16_t update_crc_ccit(uint8_t c, uint16_t prev_crc) {
14 | return (prev_crc >> 8) ^ pgm_read_word(&crc_ccit_table[(prev_crc ^ c) & 0xff]);
15 | }
16 |
17 |
18 | #endif
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/util/FIFO.h:
--------------------------------------------------------------------------------
1 | #ifndef UTIL_FIFO_H
2 | #define UTIL_FIFO_H
3 |
4 | #include
5 | #include
6 |
7 | typedef struct FIFOBuffer
8 | {
9 | unsigned char *begin;
10 | unsigned char *end;
11 | unsigned char * volatile head;
12 | unsigned char * volatile tail;
13 | } FIFOBuffer;
14 |
15 | inline bool fifo_isempty(const FIFOBuffer *f) {
16 | return f->head == f->tail;
17 | }
18 |
19 | inline bool fifo_isfull(const FIFOBuffer *f) {
20 | return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
21 | }
22 |
23 | inline void fifo_push(FIFOBuffer *f, unsigned char c) {
24 | *(f->tail) = c;
25 |
26 | if (f->tail == f->end) {
27 | f->tail = f->begin;
28 | } else {
29 | f->tail++;
30 | }
31 | }
32 |
33 | inline unsigned char fifo_pop(FIFOBuffer *f) {
34 | if(f->head == f->end) {
35 | f->head = f->begin;
36 | return *(f->end);
37 | } else {
38 | return *(f->head++);
39 | }
40 | }
41 |
42 | inline void fifo_flush(FIFOBuffer *f) {
43 | f->head = f->tail;
44 | }
45 |
46 | inline bool fifo_isempty_locked(const FIFOBuffer *f) {
47 | bool result;
48 | ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
49 | result = fifo_isempty(f);
50 | }
51 | return result;
52 | }
53 |
54 | inline bool fifo_isfull_locked(const FIFOBuffer *f) {
55 | bool result;
56 | ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
57 | result = fifo_isfull(f);
58 | }
59 | return result;
60 | }
61 |
62 | inline void fifo_push_locked(FIFOBuffer *f, unsigned char c) {
63 | ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
64 | fifo_push(f, c);
65 | }
66 | }
67 |
68 | inline unsigned char fifo_pop_locked(FIFOBuffer *f) {
69 | unsigned char c;
70 | ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
71 | c = fifo_pop(f);
72 | }
73 | return c;
74 | }
75 |
76 | inline void fifo_init(FIFOBuffer *f, unsigned char *buffer, size_t size) {
77 | f->head = f->tail = f->begin = buffer;
78 | f->end = buffer + size -1;
79 | }
80 |
81 | inline size_t fifo_len(FIFOBuffer *f) {
82 | return f->end - f->begin;
83 | }
84 |
85 | #endif
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/util/constants.h:
--------------------------------------------------------------------------------
1 | #define PROTOCOL_KISS 0x01
2 | #define PROTOCOL_SIMPLE_SERIAL 0x02
3 |
4 | #define m328p 0x01
5 | #define m1284p 0x02
6 | #define m644p 0x03
7 |
8 | #define REF_3V3 0x01
9 | #define REF_5V 0x02
10 |
11 | #define SERIAL_FRAMING_KISS 0x01
12 | #define SERIAL_FRAMING_DIRECT 0x02
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/util/time.h:
--------------------------------------------------------------------------------
1 | #ifndef UTIL_TIME_H
2 | #define UTIL_TIME_H
3 |
4 | #include
5 | #include "device.h"
6 |
7 | #define DIV_ROUND(dividend, divisor) (((dividend) + (divisor) / 2) / (divisor))
8 | #define CLOCK_TICKS_PER_SEC CONFIG_AFSK_DAC_SAMPLERATE
9 |
10 | typedef int32_t ticks_t;
11 | typedef int32_t mtime_t;
12 |
13 | volatile ticks_t _clock;
14 |
15 | inline ticks_t timer_clock(void) {
16 | ticks_t result;
17 |
18 | ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
19 | result = _clock;
20 | }
21 |
22 | return result;
23 | }
24 |
25 |
26 | inline ticks_t ms_to_ticks(mtime_t ms) {
27 | return ms * DIV_ROUND(CLOCK_TICKS_PER_SEC, 1000);
28 | }
29 |
30 | inline void cpu_relax(void) {
31 | // Do nothing!
32 | }
33 |
34 | inline void delay_ms(unsigned long ms) {
35 | ticks_t start = timer_clock();
36 | unsigned long n_ticks = ms_to_ticks(ms);
37 | while (timer_clock() - start < n_ticks) {
38 | cpu_relax();
39 | }
40 | }
41 |
42 |
43 | #endif
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