├── .gitignore ├── LICENSE ├── LT8920.cpp ├── LT8920.h ├── README.md └── examples ├── RxDemo └── RxDemo.ino ├── TxDemo └── TxDemo.ino ├── lt8920test └── lt8920test.ino └── scanner └── scanner.ino /.gitignore: -------------------------------------------------------------------------------- 1 | # Prerequisites 2 | *.d 3 | 4 | # Compiled Object files 5 | *.slo 6 | *.lo 7 | *.o 8 | *.obj 9 | 10 | # Precompiled Headers 11 | *.gch 12 | *.pch 13 | 14 | # Compiled Dynamic libraries 15 | *.so 16 | *.dylib 17 | *.dll 18 | 19 | # Fortran module files 20 | *.mod 21 | *.smod 22 | 23 | # Compiled Static libraries 24 | *.lai 25 | *.la 26 | *.a 27 | *.lib 28 | 29 | # Executables 30 | *.exe 31 | *.out 32 | *.app 33 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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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 | -------------------------------------------------------------------------------- /LT8920.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include "LT8920.h" 3 | 4 | #define REGISTER_READ 0b10000000 //bin 5 | #define REGISTER_WRITE 0b00000000 //bin 6 | #define REGISTER_MASK 0b01111111 //bin 7 | 8 | #define R_CHANNEL 7 9 | #define CHANNEL_RX_BIT 7 10 | #define CHANNEL_TX_BIT 8 11 | #define CHANNEL_MASK 0b01111111 ///bin 12 | #define DEFAULT_CHANNEL 0x31 13 | 14 | #define R_CURRENT 9 15 | #define CURRENT_POWER_SHIFT 12 16 | #define CURRENT_POWER_MASK 0b1111000000000000 17 | #define CURRENT_GAIN_SHIFT 7 18 | #define CURRENT_GAIN_MASK 0b0000011110000000 19 | 20 | #define R_DATARATE 44 21 | #define DATARATE_MASK 0xFF00 22 | #define DATARATE_1MBPS 0x0101 23 | #define DATARATE_250KBPS 0x0401 24 | #define DATARATE_125KBPS 0x0801 25 | #define DATARATE_62KBPS 0x1001 26 | 27 | #define R_SYNCWORD1 36 28 | #define R_SYNCWORD2 37 29 | #define R_SYNCWORD3 38 30 | #define R_SYNCWORD4 39 31 | 32 | #define R_PACKETCONFIG 41 33 | #define PACKETCONFIG_CRC_ON 0x8000 34 | #define PACKETCONFIG_SCRAMBLE_ON 0x4000 35 | #define PACKETCONFIG_PACK_LEN_ENABLE 0x2000 36 | #define PACKETCONFIG_FW_TERM_TX 0x1000 37 | #define PACKETCONFIG_AUTO_ACK 0x0800 38 | #define PACKETCONFIG_PKT_FIFO_POLARITY 0x0400 39 | 40 | #define R_STATUS 48 41 | #define STATUS_CRC_BIT 15 42 | 43 | 44 | #define R_FIFO 50 45 | #define R_FIFO_CONTROL 52 46 | 47 | void LT8920::dump_register(uint8_t reg) { 48 | uint16_t r = readRegister(reg); 49 | Serial.print("reg: "); 50 | Serial.print(reg); 51 | Serial.print(" , value: "); 52 | Serial.println(r,HEX); 53 | } 54 | 55 | LT8920::LT8920(const uint8_t cs, const uint8_t pkt, const uint8_t rst) 56 | { 57 | _pin_chipselect = cs; 58 | _pin_pktflag = pkt; 59 | _pin_reset = rst; 60 | _channel = DEFAULT_CHANNEL; 61 | 62 | pinMode(_pin_chipselect, OUTPUT); 63 | pinMode(_pin_pktflag, INPUT); 64 | pinMode(_pin_reset, OUTPUT); 65 | 66 | digitalWrite(_pin_chipselect, HIGH); 67 | } 68 | 69 | void LT8920::begin() 70 | { 71 | if(_pin_reset > 0) 72 | { 73 | digitalWrite(_pin_reset, LOW); 74 | delay(200); 75 | digitalWrite(_pin_reset, HIGH); 76 | delay(200); 77 | 78 | } 79 | //setup 80 | 81 | writeRegister(0, 0x6fe0); 82 | writeRegister(1, 0x5681); 83 | writeRegister(2, 0x6617); 84 | writeRegister(4, 0x9cc9); //why does this differ from powerup (5447) 85 | writeRegister(5, 0x6637); //why does this differ from powerup (f000) 86 | writeRegister(8, 0x6c90); //power (default 71af) UNDOCUMENTED 87 | 88 | setCurrentControl(4, 0); // power & gain. 89 | 90 | writeRegister(10, 0x7ffd); //bit 0: XTAL OSC enable 91 | writeRegister(11, 0x0000); //bit 8: Power down RSSI (0= RSSI operates normal) 92 | writeRegister(12, 0x0000); 93 | writeRegister(13, 0x48bd); //(default 4855) 94 | 95 | writeRegister(22, 0x00ff); 96 | writeRegister(23, 0x8005); //bit 2: Calibrate VCO before each Rx/Tx enable 97 | writeRegister(24, 0x0067); 98 | writeRegister(25, 0x1659); 99 | writeRegister(26, 0x19e0); 100 | writeRegister(27, 0x1300); //bits 5:0, Crystal Frequency adjust 101 | writeRegister(28, 0x1800); 102 | 103 | //fedcba9876543210 104 | writeRegister(32, 0x5000); //AAABBCCCDDEEFFFG A preamble length, B, syncword length, c trailer length, d packet type 105 | // E FEC_type, F BRCLK_SEL, G reserved 106 | //0x5000 = 0101 0000 0000 0000 = preamble 010 (3 bytes), B 10 (48 bits) 107 | writeRegister(33, 0x3fc7); 108 | writeRegister(34, 0x2000); // 109 | writeRegister(35, 0x0300); //POWER mode, bit 8/9 on = retransmit = 3x (default) 110 | setSyncWord(0x03805a5a03800380); 111 | 112 | writeRegister(40, 0x4401); //max allowed error bits = 0 (01 = 0 error bits) 113 | writeRegister(R_PACKETCONFIG, 114 | PACKETCONFIG_CRC_ON | 115 | PACKETCONFIG_PACK_LEN_ENABLE | 116 | PACKETCONFIG_FW_TERM_TX 117 | ); 118 | 119 | writeRegister(42, 0xfdb0); 120 | writeRegister(43, 0x000f); 121 | 122 | //setDataRate(LT8920_1MBPS); 123 | 124 | writeRegister(R_FIFO, 0x0000); //TXRX_FIFO_REG (FIFO queue) 125 | 126 | writeRegister(R_FIFO_CONTROL, 0x8080); //Fifo Rx/Tx queue reset 127 | 128 | delay(200); 129 | writeRegister(R_CHANNEL, _BV(CHANNEL_TX_BIT)); //set TX mode. (TX = bit 8, RX = bit 7, so RX would be 0x0080) 130 | delay(2); 131 | writeRegister(R_CHANNEL, _channel); // Frequency = 2402 + channel 132 | } 133 | 134 | void LT8920::setChannel(uint8_t channel) 135 | { 136 | _channel = channel; 137 | writeRegister(R_CHANNEL, (_channel & CHANNEL_MASK)); 138 | } 139 | 140 | uint8_t LT8920::getChannel() 141 | { 142 | return _channel; 143 | } 144 | 145 | void LT8920::setCurrentControl(uint8_t power, uint8_t gain) 146 | { 147 | writeRegister(R_CURRENT, 148 | ((power << CURRENT_POWER_SHIFT) & CURRENT_POWER_MASK) | 149 | ((gain << CURRENT_GAIN_SHIFT) & CURRENT_GAIN_MASK)); 150 | } 151 | 152 | bool LT8920::setDataRate(DataRate rate) 153 | { 154 | uint16_t newValue; 155 | 156 | switch (rate) 157 | { 158 | case LT8920_1MBPS: 159 | newValue = DATARATE_1MBPS; 160 | break; 161 | case LT8920_250KBPS: 162 | newValue = DATARATE_250KBPS; 163 | break; 164 | case LT8920_125KBPS: 165 | newValue = DATARATE_125KBPS; 166 | break; 167 | case LT8920_62KBPS: 168 | newValue = DATARATE_62KBPS; 169 | break; 170 | default: 171 | return false; 172 | } 173 | 174 | writeRegister(R_DATARATE, newValue); 175 | return ( (readRegister(R_DATARATE) & DATARATE_MASK) == (newValue & DATARATE_MASK)); 176 | } 177 | 178 | LT8920::DataRate LT8920::getDataRate() 179 | { 180 | uint16_t value = readRegister(R_DATARATE) & DATARATE_MASK; 181 | switch (value) 182 | { 183 | case DATARATE_1MBPS: 184 | return LT8920_1MBPS; 185 | case DATARATE_250KBPS: 186 | return LT8920_250KBPS; 187 | case DATARATE_125KBPS: 188 | return LT8920_125KBPS; 189 | case DATARATE_62KBPS: 190 | return LT8920_62KBPS; 191 | } 192 | } 193 | 194 | uint16_t LT8920::readRegister(uint8_t reg) 195 | { 196 | digitalWrite(_pin_chipselect, LOW); 197 | SPI.transfer(REGISTER_READ | (REGISTER_MASK & reg)); 198 | uint8_t high = SPI.transfer(0x00); 199 | uint8_t low = SPI.transfer(0x00); 200 | 201 | digitalWrite(_pin_chipselect, HIGH); 202 | 203 | // Serial.print(reg); 204 | // Serial.print(" = "); 205 | // Serial.println(high << 8 | low); 206 | 207 | return (high << 8 | low); 208 | } 209 | 210 | uint8_t LT8920::writeRegister(uint8_t reg, uint16_t data) 211 | { 212 | uint8_t high = data >> 8; 213 | uint8_t low = data & 0xFF; 214 | 215 | return writeRegister2(reg, high, low); 216 | } 217 | 218 | uint8_t LT8920::writeRegister2(uint8_t reg, uint8_t high, uint8_t low) 219 | { 220 | 221 | // char sbuf[32]; 222 | // sprintf_P(sbuf, PSTR("%d => %02x%02x"), reg, high, low); 223 | // Serial.println(sbuf); 224 | 225 | 226 | digitalWrite(_pin_chipselect, LOW); 227 | uint8_t result = SPI.transfer(REGISTER_WRITE | (REGISTER_MASK & reg)); 228 | SPI.transfer(high); 229 | SPI.transfer(low); 230 | 231 | digitalWrite(_pin_chipselect, HIGH); 232 | return result; 233 | } 234 | 235 | void LT8920::sleep() 236 | { 237 | //set bit 14 on register 35. 238 | writeRegister(35, readRegister(35) | _BV(14)); 239 | } 240 | 241 | void LT8920::whatsUp(Stream &stream) 242 | { 243 | uint16_t mode = readRegister(R_CHANNEL); 244 | stream.print("\nTx_EN="); 245 | stream.println((mode & _BV(CHANNEL_TX_BIT)) != false); 246 | stream.print("Rx_EN="); 247 | stream.println((mode & _BV(CHANNEL_RX_BIT)) != false); 248 | stream.print("Channel="); 249 | stream.println(mode & CHANNEL_MASK); 250 | 251 | //read the status register. 252 | uint16_t state = readRegister(R_STATUS); 253 | 254 | bool crc_error = state & _BV(15); 255 | bool fec23_error = state & _BV(14); 256 | uint8_t framer_st = (state & 0b0011111100000000) >> 8; 257 | bool pkt_flag = state & _BV(6); 258 | bool fifo_flag = state & _BV(5); 259 | 260 | stream.print("CRC="); 261 | stream.println(crc_error); 262 | stream.print("FEC="); 263 | stream.println(fec23_error); 264 | stream.print("FRAMER_ST="); 265 | stream.println(framer_st); 266 | stream.print("PKT="); 267 | stream.println(pkt_flag); 268 | stream.print("FIFO="); 269 | stream.println(fifo_flag); 270 | 271 | uint16_t fifo = readRegister(R_FIFO_CONTROL); 272 | stream.print("FIFO_WR_PTR="); 273 | stream.println((fifo >> 8) & 0b111111); 274 | stream.print("FIFO_RD_PTR="); 275 | stream.println(fifo & 0b111111); 276 | } 277 | 278 | bool LT8920::available() 279 | { 280 | //read the PKT_FLAG state; this can also be done with a hard wire. 281 | 282 | if (digitalRead(_pin_pktflag) != 0) 283 | { 284 | return true; 285 | } 286 | 287 | return false; 288 | } 289 | 290 | int LT8920::read(uint8_t *buffer, size_t maxBuffer) 291 | { 292 | uint16_t value = readRegister(R_STATUS); 293 | if (bitRead(value, STATUS_CRC_BIT) == 0) 294 | { 295 | //CRC ok 296 | 297 | uint16_t data = readRegister(R_FIFO); 298 | uint8_t packetSize = data >> 8; 299 | if(maxBuffer < packetSize+1) 300 | { 301 | //BUFFER TOO SMALL 302 | return -2; 303 | } 304 | 305 | uint8_t pos; 306 | buffer[pos++] = (data & 0xFF); 307 | while (pos < packetSize) 308 | { 309 | data = readRegister(R_FIFO); 310 | buffer[pos++] = data >> 8; 311 | buffer[pos++] = data & 0xFF; 312 | } 313 | 314 | return packetSize; 315 | } 316 | else 317 | { 318 | //CRC error 319 | return -1; 320 | } 321 | } 322 | 323 | void LT8920::startListening() 324 | { 325 | writeRegister(R_CHANNEL, _channel & CHANNEL_MASK); //turn off rx/tx 326 | delay(3); 327 | writeRegister(R_FIFO_CONTROL, 0x0080); //flush rx 328 | writeRegister(R_CHANNEL, (_channel & CHANNEL_MASK) | _BV(CHANNEL_RX_BIT)); //enable RX 329 | delay(5); 330 | } 331 | 332 | /* set the BRCLK_SEL value */ 333 | void LT8920::setClock(uint8_t clock) 334 | { 335 | //register 32, bits 3:1. 336 | uint16_t val = readRegister(35); 337 | val &= 0b1111111111110001; 338 | val |= ((clock & 0x07) << 1);; 339 | 340 | writeRegister(35, val); 341 | } 342 | 343 | bool LT8920::sendPacket(uint8_t *data, size_t packetSize) 344 | { 345 | if (packetSize < 1 || packetSize > 255) 346 | { 347 | return false; 348 | } 349 | 350 | writeRegister(R_CHANNEL, 0x0000); 351 | writeRegister(R_FIFO_CONTROL, 0x8000); //flush tx 352 | 353 | //packets are sent in 16bit words, and the first word will be the packet size. 354 | //start spitting out words until we are done. 355 | 356 | uint8_t pos = 0; 357 | writeRegister2(R_FIFO, packetSize, data[pos++]); 358 | while (pos < packetSize) 359 | { 360 | uint8_t msb = data[pos++]; 361 | uint8_t lsb = data[pos++]; 362 | 363 | writeRegister2(R_FIFO, msb, lsb); 364 | } 365 | 366 | writeRegister(R_CHANNEL, (_channel & CHANNEL_MASK) | _BV(CHANNEL_TX_BIT)); //enable TX 367 | 368 | //Wait until the packet is sent. 369 | while (digitalRead(_pin_pktflag) == 0) 370 | { 371 | //do nothing. 372 | } 373 | 374 | return true; 375 | } 376 | 377 | void LT8920::setSyncWord(uint64_t syncWord) 378 | { 379 | writeRegister(R_SYNCWORD1, syncWord); 380 | writeRegister(R_SYNCWORD2, syncWord >> 16); 381 | writeRegister(R_SYNCWORD3, syncWord >> 32); 382 | writeRegister(R_SYNCWORD4, syncWord >> 48); 383 | } 384 | 385 | void LT8920::setSyncWordLength(uint8_t option) 386 | { 387 | option &= 0x03; 388 | option <<= 11; 389 | 390 | writeRegister(32, (readRegister(32) & 0b0001100000000000) | option); 391 | } 392 | 393 | uint8_t LT8920::getRSSI() 394 | { 395 | //RSSI: 15:10 396 | uint16_t value = readRegister(6); 397 | 398 | return (value >> 10); 399 | } 400 | 401 | void LT8920::scanRSSI(uint16_t *buffer, uint8_t start_channel, uint8_t num_channels) 402 | { 403 | // writeRegister(R_CHANNEL, _BV(CHANNEL_RX_BIT)); 404 | // 405 | // //add read mode. 406 | writeRegister(R_FIFO_CONTROL, 0x8080); //flush rx 407 | // writeRegister(R_CHANNEL, 0x0000); 408 | 409 | //set number of channels to scan. 410 | writeRegister(42, (readRegister(42) & 0b0000001111111111) | ((num_channels-1 & 0b111111) << 10)); 411 | 412 | //set channel scan offset. 413 | writeRegister(43, (readRegister(43) & 0b0000000011111111) | ((start_channel & 0b1111111) << 8)); 414 | writeRegister(43, (readRegister(43) & 0b0111111111111111) | _BV(15)); 415 | 416 | while(digitalRead(_pin_pktflag) == 0) 417 | { 418 | } 419 | 420 | 421 | //read the results. 422 | uint8_t pos = 0; 423 | while(pos < num_channels) 424 | { 425 | uint16_t data = readRegister(R_FIFO); 426 | buffer[pos++] = data >> 8; 427 | } 428 | } 429 | -------------------------------------------------------------------------------- /LT8920.h: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (C) 2015 Rob van der Veer, 3 | 4 | This program is free software; you can redistribute it and/or 5 | modify it under the terms of the GNU General Public License 6 | version 2 as published by the Free Software Foundation. 7 | */ 8 | 9 | #ifndef LT8920_H 10 | #define LT8920_H 11 | 12 | class LT8920 13 | { 14 | 15 | public: 16 | /** Data Data 17 | */ 18 | enum DataRate 19 | { 20 | LT8920_1MBPS, /** default transmit rate */ 21 | LT8920_250KBPS, /** 250 Kpbs, only on lt8910 */ 22 | LT8920_125KBPS, /** 125 Kbps, only on lt8910 */ 23 | LT8920_62KBPS /** 62 Kbps, only on lt8910 */ 24 | }; 25 | 26 | private: 27 | uint8_t _pin_chipselect; 28 | uint8_t _pin_pktflag; 29 | uint8_t _pin_reset; 30 | uint8_t _channel; 31 | 32 | public: 33 | /** Construct a new instance 34 | * @param cs Chip Select, this is the SLAVE SELECT pin. Please note that it is a different location than the NRF24L01+ SS pin. 35 | * @param pkt PKT_flag input signal pin. Comparable to the NRF24L01+ IRQ pin. 36 | * @param rst RESET pin. Use 0 to disable. 37 | */ 38 | LT8920(const uint8_t cs, const uint8_t pkt, const uint8_t rst); 39 | 40 | /** Configures the module for initial use */ 41 | void begin(); 42 | 43 | /** 设置信道 44 | * @param channel has significant 7 bits 45 | */ 46 | void setChannel(uint8_t channel); 47 | /** Retrieve the current channel */ 48 | uint8_t getChannel(); 49 | 50 | /** Set power and gain 51 | * @param power 0-0xf 52 | * @param gain 0-0xf 53 | */ 54 | void setCurrentControl(uint8_t power, uint8_t gain); 55 | 56 | /** Sets the data rate 57 | * @param rate the transmission/reception speed 58 | * @returns true when the data rate was succesfully changed. 59 | */ 60 | bool setDataRate(DataRate rate); 61 | 62 | /** Returns the data rate 63 | * @returns the active data rate. 64 | */ 65 | DataRate getDataRate(); 66 | 67 | /** Read the value of a register 68 | * @param reg 69 | */ 70 | uint16_t readRegister(uint8_t reg); 71 | 72 | /** Writes to a register 73 | * @param reg The register to write to 74 | * @param data 16bits of data, MSB first */ 75 | uint8_t writeRegister(uint8_t reg, uint16_t data); 76 | 77 | /** Writes to a register, one byte at a time. 78 | * This is a convenience function, because the LT8920 uses 16 bits registers with all 16 bits written at once. 79 | * @param reg The register to write to 80 | * @param high bits 15..8 81 | * @param low bits 7..0 */ 82 | uint8_t writeRegister2(uint8_t reg, uint8_t high, uint8_t low); 83 | 84 | void dump_register(uint8_t reg); 85 | 86 | /** Put the LT8920 module to sleep mode. 87 | * In contrast to POWER DOWN, this mode will keep the register values 88 | * Any SPI call will awaken the module automatically */ 89 | void sleep(); 90 | 91 | /** Dumps debug information on the selected port 92 | * @param stream the output stream to use as output, eg. `whatsUp(&Serial);` 93 | */ 94 | void whatsUp(Stream &stream); 95 | 96 | /** Signals a packet ready in the FIFO queue */ 97 | bool available(); 98 | 99 | /** Read a packet into the buffer 100 | * @param buffer a pointer to a buffer large enough to hold the packet 101 | * @param maxBuffer the maximum size of the buffer. Any bytes left over in the buffer will be dropped. 102 | * @returns the size of the packet that was read, -1 for CRC error 103 | */ 104 | int read(uint8_t *buffer, size_t maxBuffer); 105 | 106 | /** Switch the module to RX mode */ 107 | void startListening(); 108 | 109 | /** Sets the internal clock divider 110 | * @param clock 111 | */ 112 | void setClock(uint8_t clock); 113 | 114 | /** Sends a packet 115 | * This call blocks until the packet was sent and the Tx Buffer has been completed 116 | * @param data 117 | * @param packetSize 118 | * @returns true when the packet was sent, or false when the packetSize was invalid. 119 | */ 120 | bool sendPacket(uint8_t *data, size_t packetSize); 121 | 122 | /** Set Syncword 123 | * @param syncWord 64 bits of sync word settings. 124 | * @see setSyncwordLength 125 | */ 126 | void setSyncWord(uint64_t syncWord); 127 | 128 | /** Sets the length of the sync word used 129 | * @param length: 130 | * 11 = 64bits, 10 = 48 bits, 01 = 32 bits, 00 = 16 bits 131 | * @see Check the datasheet for which bits are actually used. 132 | */ 133 | void setSyncWordLength(uint8_t length); 134 | 135 | /** Scan the signal strength for one or more channels 136 | * @param buffer points to a buffer to store the signal strengths, at least num_channels 137 | * @param start_channel starting channel to scan, where Frequency = 2402 + channel 138 | * @param num_channels number of channels to scan in this batch, for example scanning 4 channels 139 | * with start 2480 will scan 2480, 2481, 2482, 2483 140 | */ 141 | void scanRSSI(uint16_t *buffer, uint8_t start_channel, uint8_t num_channels); 142 | 143 | /** retrieve the analog signal strength for the current channel */ 144 | uint8_t getRSSI(); 145 | }; 146 | 147 | 148 | #endif //LT8920_H 149 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # LT8920 2 | Arduino Library for LT8920 2.4G RF Transceiver 3 | This project is based on LT8910 Project: https://github.com/534659123/LT8910 4 | Change List: 5 | 1. fix some small bugs. 6 | 2. works on ESP8266 Arduino. 7 | 3. clean some notes. 8 | 4. add dump_register method for debug. 9 | 5. remove some useless files. 10 | 11 | Note: Data rate may have issues when setting other value than 1Mbps. 12 | -------------------------------------------------------------------------------- /examples/RxDemo/RxDemo.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include "LT8920.h" 3 | 4 | const uint8_t PIN_NRF_RST = 16; 5 | const uint8_t PIN_NRF_CS = 5; 6 | const uint8_t PIN_NRF_PKT = 4; 7 | 8 | 9 | LT8920 lt(PIN_NRF_CS, PIN_NRF_PKT, PIN_NRF_RST); 10 | 11 | void setup() 12 | { 13 | Serial.begin(74880); 14 | SPI.begin(); 15 | SPI.setBitOrder(MSBFIRST); 16 | SPI.setClockDivider(SPI_CLOCK_DIV64); 17 | delay(500); 18 | lt.begin(); 19 | lt.setCurrentControl(0,0); 20 | lt.setDataRate(LT8920::LT8920_1MBPS); 21 | lt.setChannel(0x20); 22 | } 23 | 24 | void loop() 25 | { 26 | if (lt.available()) 27 | { 28 | uint8_t data[16]; 29 | int packetSize = lt.read(data, 16); 30 | if (packetSize > 0) 31 | { 32 | Serial.println(F("Packet read OK")); 33 | Serial.println((char *)data); 34 | } 35 | else 36 | { 37 | Serial.println(F("CRC is ERROR")); 38 | } 39 | lt.startListening(); 40 | } 41 | } -------------------------------------------------------------------------------- /examples/TxDemo/TxDemo.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include "LT8920.h" 3 | 4 | const uint8_t PIN_NRF_RST = 16; 5 | const uint8_t PIN_NRF_CS = 5; 6 | const uint8_t PIN_NRF_PKT = 4; 7 | 8 | LT8920 lt(PIN_NRF_CS, PIN_NRF_PKT, PIN_NRF_RST); 9 | 10 | uint8_t number = 0; 11 | 12 | void setup() 13 | { 14 | Serial.begin(74880); 15 | SPI.begin(); 16 | SPI.setBitOrder(MSBFIRST); 17 | SPI.setClockDivider(SPI_CLOCK_DIV64); 18 | delay(500); 19 | lt.begin(); 20 | lt.setCurrentControl(0,0); 21 | lt.setDataRate(LT8920::LT8920_1MBPS); 22 | lt.setChannel(0x20); 23 | } 24 | 25 | void loop() 26 | { 27 | delay(100); 28 | uint8_t data[16]; 29 | sprintf((char *)data,"number: %d",number++); 30 | lt.sendPacket(data, strlen((char *)data)+1); 31 | Serial.println((char *)data); 32 | } 33 | -------------------------------------------------------------------------------- /examples/lt8920test/lt8920test.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include "LT8920.h" 3 | 4 | const uint8_t PIN_NRF_RST = 16; 5 | const uint8_t PIN_NRF_CS = 5; 6 | const uint8_t PIN_NRF_PKT = 4; 7 | const uint8_t PIN_ROLE = 0; 8 | bool writer; 9 | 10 | LT8920 lt(PIN_NRF_CS, PIN_NRF_PKT, PIN_NRF_RST); 11 | 12 | void setup() 13 | { 14 | Serial.begin(74800); 15 | SPI.begin(); 16 | SPI.setBitOrder(MSBFIRST); 17 | SPI.setClockDivider(SPI_CLOCK_DIV16); 18 | 19 | pinMode(PIN_ROLE, INPUT_PULLUP); 20 | 21 | delay(500); 22 | 23 | lt.begin(); 24 | lt.setCurrentControl(4,15); 25 | lt.setDataRate(LT8920::LT8920_62KBPS); 26 | lt.setChannel(0x06); 27 | 28 | char sbuf[32]; 29 | 30 | //verify chip registers. 31 | for (int i = 0; i <= 50; i++) 32 | { 33 | uint16_t value = lt.readRegister(i); 34 | 35 | sprintf_P(sbuf, PSTR("%d = %04x\r\n"), i, value); 36 | Serial.print(sbuf); 37 | } 38 | 39 | if ((digitalRead(PIN_ROLE) == LOW)) 40 | { 41 | writer = true; 42 | Serial.println(F("Writer mode")); 43 | } 44 | else 45 | { 46 | writer = false; 47 | Serial.println(F("Reader mode")); 48 | lt.startListening(); 49 | } 50 | 51 | lt.whatsUp(Serial); 52 | Serial.println(F("Boot completed.")); 53 | } 54 | 55 | void loop() 56 | { 57 | if (writer) 58 | { 59 | delay(2000); 60 | 61 | //send a packet. 62 | uint8_t data[] = { 1,2,3,4,5 }; 63 | 64 | lt.sendPacket(data, 5); 65 | lt.whatsUp(Serial); 66 | } 67 | else 68 | { 69 | if (lt.available()) 70 | { 71 | Serial.println(F("Data available")); 72 | 73 | uint8_t buf[32]; 74 | 75 | int packetSize = lt.read(buf, 32); 76 | if (packetSize > 0) 77 | { 78 | Serial.println(F("Packet read OK")); 79 | 80 | //dump the packet. 81 | for(int i = 0; i < packetSize; i++) 82 | { 83 | Serial.print(i); 84 | Serial.print("="); 85 | Serial.println(buf[i]); 86 | } 87 | } 88 | else 89 | { 90 | Serial.println(F("Packet read fail")); 91 | lt.whatsUp(Serial); 92 | } 93 | 94 | lt.startListening(); 95 | } 96 | } 97 | } 98 | -------------------------------------------------------------------------------- /examples/scanner/scanner.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include "LT8920.h" 3 | 4 | const uint8_t PIN_NRF_RST = 16; 5 | const uint8_t PIN_NRF_CS = 5; 6 | const uint8_t PIN_NRF_PKT = 4; 7 | const uint8_t PIN_ROLE = 0; 8 | 9 | LT8920 lt(PIN_NRF_CS, PIN_NRF_PKT, PIN_NRF_RST); 10 | 11 | void setup() 12 | { 13 | Serial.begin(74800); 14 | 15 | SPI.begin(); 16 | SPI.setBitOrder(MSBFIRST); 17 | SPI.setClockDivider(SPI_CLOCK_DIV16); 18 | 19 | lt.begin(); 20 | lt.setCurrentControl(15,15); 21 | lt.setChannel(0x06); 22 | } 23 | 24 | void loop() 25 | { 26 | uint16_t wifi_Channels[] = { 27 | 2412, 28 | 2417, 29 | 2422, 30 | 2427, 31 | 2432, 32 | 2437, 33 | 2442, 34 | 2447, 35 | 2452, 36 | 2457, 37 | 2462, 38 | 2467, 39 | 2472, 40 | 2484 41 | }; 42 | 43 | uint16_t signals[32]; 44 | char sbuf[64]; 45 | 46 | Serial.println("\n\n"); 47 | 48 | for(int i = 0; i < sizeof(wifi_Channels)/sizeof(uint16_t); i++) 49 | { 50 | lt.scanRSSI(&signals[i], wifi_Channels[i]-2402, 1); 51 | } 52 | 53 | for(int i = 0; i < sizeof(wifi_Channels)/sizeof(uint16_t); i++) 54 | { 55 | sprintf(sbuf, "[%02d] %d = %04x ", i+1, wifi_Channels[i], signals[i]); 56 | Serial.print(sbuf); 57 | for(int j =0 ; j < signals[i]/2; j++) 58 | { 59 | Serial.print('#'); 60 | } 61 | Serial.println(); 62 | } 63 | delay(250); 64 | } 65 | --------------------------------------------------------------------------------