├── README
├── Makefile
└── canonicalarduinoread.c


/README:
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 1 | www.chrisheydrick.com
 2 |      
 3 | June 23 2012
 4 | 
 5 | CanonicalArduinoRead write a byte to an Arduino, and then
 6 | receives a serially transmitted string in response.
 7 | 
 8 | The call/response Arduino sketch is here:
 9 | https://gist.github.com/2980344
10 | 
11 | 


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/Makefile:
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 1 | # Generic GNUMakefile found on Wikipedia
 2 | # Just a snippet to stop executing under other make(1) commands
 3 | # that won't understand these lines
 4 | ifneq (,)
 5 | This makefile requires GNU Make.
 6 | endif
 7 |  
 8 | PROGRAM = canonicalarduinoread
 9 | C_FILES := $(wildcard *.c)
10 | OBJS := $(patsubst %.c, %.o, $(C_FILES))
11 | CC = cc
12 | CFLAGS =
13 | LDFLAGS = 
14 |  
15 | all: $(PROGRAM)
16 |  
17 | $(PROGRAM): .depend $(OBJS)
18 | 	$(CC) $(CFLAGS) $(OBJS) $(LDFLAGS) -o $(PROGRAM)
19 |  
20 | depend: .depend
21 |  
22 | .depend: cmd = gcc -MM -MF depend $(var); cat depend >> .depend;
23 | .depend: 
24 | 	@echo "Generating dependencies..."
25 | 	@$(foreach var, $(C_FILES), $(cmd))
26 | 	@rm -f depend
27 |  
28 | -include .depend
29 |  
30 | # These are the pattern matching rules. In addition to the automatic
31 | # variables used here, the variable $* that matches whatever % stands for
32 | # can be useful in special cases.
33 | %.o: %.c
34 | 	$(CC) $(CFLAGS) -c $< -o $@
35 |  
36 | %: %.c
37 | 	$(CC) $(CFLAGS) -o $@ $< 
38 |  
39 | clean:
40 | 	rm -f .depend *.o
41 |  
42 | .PHONY: clean depend
43 | 
44 | 
45 | 


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/canonicalarduinoread.c:
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 1 | /* www.chrisheydrick.com
 2 |      
 3 |    June 23 2012
 4 | 
 5 |    CanonicalArduinoRead write a byte to an Arduino, and then
 6 |    receives a serially transmitted string in response.
 7 | 
 8 |    The call/response Arduino sketch is here:
 9 |    https://gist.github.com/2980344
10 | 
11 |    Arduino sketch details at www.chrisheydrick.com
12 | */
13 | 
14 | #include <stdlib.h>
15 | #include <stdio.h>
16 | #include <string.h>
17 | #include <unistd.h>
18 | #include <stdint.h>
19 | #include <fcntl.h>
20 | #include <termios.h>
21 | #include <errno.h>
22 | #include <sys/ioctl.h>
23 | 
24 | #define DEBUG 1
25 |   
26 | int main(int argc, char *argv[])
27 | {
28 |   int fd, n, i;
29 |   char buf[64] = "temp text";
30 |   struct termios toptions;
31 | 
32 |   /* open serial port */
33 |   fd = open("/dev/ttyACM0", O_RDWR | O_NOCTTY);
34 |   printf("fd opened as %i\n", fd);
35 |   
36 |   /* wait for the Arduino to reboot */
37 |   usleep(3500000);
38 |   
39 |   /* get current serial port settings */
40 |   tcgetattr(fd, &toptions);
41 |   /* set 9600 baud both ways */
42 |   cfsetispeed(&toptions, B9600);
43 |   cfsetospeed(&toptions, B9600);
44 |   /* 8 bits, no parity, no stop bits */
45 |   toptions.c_cflag &= ~PARENB;
46 |   toptions.c_cflag &= ~CSTOPB;
47 |   toptions.c_cflag &= ~CSIZE;
48 |   toptions.c_cflag |= CS8;
49 |   /* Canonical mode */
50 |   toptions.c_lflag |= ICANON;
51 |   /* commit the serial port settings */
52 |   tcsetattr(fd, TCSANOW, &toptions);
53 | 
54 |   /* Send byte to trigger Arduino to send string back */
55 |   write(fd, "0", 1);
56 |   /* Receive string from Arduino */
57 |   n = read(fd, buf, 64);
58 |   /* insert terminating zero in the string */
59 |   buf[n] = 0;
60 | 
61 |   printf("%i bytes read, buffer contains: %s\n", n, buf);
62 |  
63 |   if(DEBUG)
64 |     {
65 |       printf("Printing individual characters in buf as integers...\n\n");
66 |       for(i=0; i<n; i++)
67 | 	{
68 | 	  printf("Byte %i:%i, ",i+1, (int)buf[i]);
69 | 	}
70 |       printf("\n");
71 |     }
72 | 
73 |   return 0;
74 | }
75 | 


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