ilkay KOZAK / RadioHead-148

V148

Fork of RadioHead-148 by David Rimer

RH_NRF24.cpp@1:b7641da2b203, 2017-10-25 (annotated)

Committer:
ilkaykozak
Date:
Wed Oct 25 05:14:09 2017 +0000
Revision:
1:b7641da2b203
Parent:
0:ab4e012489ef 
V148

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davidr99 0:ab4e012489ef 1 // NRF24.cpp
davidr99 0:ab4e012489ef 2 //
davidr99 0:ab4e012489ef 3 // Copyright (C) 2012 Mike McCauley
davidr99 0:ab4e012489ef 4 // $Id: RH_NRF24.cpp,v 1.21 2015/03/29 03:53:47 mikem Exp $
davidr99 0:ab4e012489ef 5
davidr99 0:ab4e012489ef 6 #include <RH_NRF24.h>
davidr99 0:ab4e012489ef 7
davidr99 0:ab4e012489ef 8 RH_NRF24::RH_NRF24(PINS chipEnablePin, PINS slaveSelectPin, RHGenericSPI& spi)
davidr99 0:ab4e012489ef 9 :
davidr99 0:ab4e012489ef 10 RHNRFSPIDriver(slaveSelectPin, spi),
davidr99 0:ab4e012489ef 11 _rxBufValid(0)
davidr99 0:ab4e012489ef 12 {
davidr99 0:ab4e012489ef 13 _configuration = RH_NRF24_EN_CRC | RH_NRF24_CRCO; // Default: 2 byte CRC enabled
davidr99 0:ab4e012489ef 14 _chipEnablePin = chipEnablePin;
davidr99 0:ab4e012489ef 15 }
davidr99 0:ab4e012489ef 16
davidr99 0:ab4e012489ef 17 bool RH_NRF24::init()
davidr99 0:ab4e012489ef 18 {
davidr99 0:ab4e012489ef 19 // Teensy with nRF24 is unreliable at 8MHz:
davidr99 0:ab4e012489ef 20 // so is Arduino with RF73
davidr99 0:ab4e012489ef 21 _spi.setFrequency(RHGenericSPI::Frequency1MHz);
davidr99 0:ab4e012489ef 22 if (!RHNRFSPIDriver::init())
davidr99 0:ab4e012489ef 23 return false;
davidr99 0:ab4e012489ef 24
davidr99 0:ab4e012489ef 25 // Initialise the slave select pin
davidr99 0:ab4e012489ef 26 #if (RH_PLATFORM != RH_PLATFORM_MBED)
davidr99 0:ab4e012489ef 27 pinMode(_chipEnablePin, OUTPUT);
davidr99 0:ab4e012489ef 28 #endif
davidr99 0:ab4e012489ef 29 digitalWrite(_chipEnablePin, LOW);
davidr99 0:ab4e012489ef 30
davidr99 0:ab4e012489ef 31 // Clear interrupts
davidr99 0:ab4e012489ef 32 spiWriteRegister(RH_NRF24_REG_07_STATUS, RH_NRF24_RX_DR | RH_NRF24_TX_DS | RH_NRF24_MAX_RT);
davidr99 0:ab4e012489ef 33 // Enable dynamic payload length on all pipes
davidr99 0:ab4e012489ef 34 spiWriteRegister(RH_NRF24_REG_1C_DYNPD, RH_NRF24_DPL_ALL);
davidr99 0:ab4e012489ef 35 // Enable dynamic payload length, disable payload-with-ack, enable noack
davidr99 0:ab4e012489ef 36 spiWriteRegister(RH_NRF24_REG_1D_FEATURE, RH_NRF24_EN_DPL | RH_NRF24_EN_DYN_ACK);
davidr99 0:ab4e012489ef 37 // Test if there is actually a device connected and responding
davidr99 0:ab4e012489ef 38 // CAUTION: RFM73 and version 2.0 silicon may require ACTIVATE
davidr99 0:ab4e012489ef 39 if (spiReadRegister(RH_NRF24_REG_1D_FEATURE) != (RH_NRF24_EN_DPL | RH_NRF24_EN_DYN_ACK))
davidr99 0:ab4e012489ef 40 {
davidr99 0:ab4e012489ef 41 spiWrite(RH_NRF24_COMMAND_ACTIVATE, 0x73);
davidr99 0:ab4e012489ef 42 // Enable dynamic payload length, disable payload-with-ack, enable noack
davidr99 0:ab4e012489ef 43 spiWriteRegister(RH_NRF24_REG_1D_FEATURE, RH_NRF24_EN_DPL | RH_NRF24_EN_DYN_ACK);
davidr99 0:ab4e012489ef 44 if (spiReadRegister(RH_NRF24_REG_1D_FEATURE) != (RH_NRF24_EN_DPL | RH_NRF24_EN_DYN_ACK))
davidr99 0:ab4e012489ef 45 return false;
davidr99 0:ab4e012489ef 46 }
davidr99 0:ab4e012489ef 47
davidr99 0:ab4e012489ef 48 // Make sure we are powered down
davidr99 0:ab4e012489ef 49 setModeIdle();
davidr99 0:ab4e012489ef 50
davidr99 0:ab4e012489ef 51 // Flush FIFOs
davidr99 0:ab4e012489ef 52 flushTx();
davidr99 0:ab4e012489ef 53 flushRx();
davidr99 0:ab4e012489ef 54
davidr99 0:ab4e012489ef 55 setChannel(2); // The default, in case it was set by another app without powering down
davidr99 0:ab4e012489ef 56 setRF(RH_NRF24::DataRate2Mbps, RH_NRF24::TransmitPower0dBm);
davidr99 0:ab4e012489ef 57
davidr99 0:ab4e012489ef 58 return true;
davidr99 0:ab4e012489ef 59 }
davidr99 0:ab4e012489ef 60
davidr99 0:ab4e012489ef 61 // Use the register commands to read and write the registers
davidr99 0:ab4e012489ef 62 uint8_t RH_NRF24::spiReadRegister(uint8_t reg)
davidr99 0:ab4e012489ef 63 {
davidr99 0:ab4e012489ef 64 return spiRead((reg & RH_NRF24_REGISTER_MASK) | RH_NRF24_COMMAND_R_REGISTER);
davidr99 0:ab4e012489ef 65 }
davidr99 0:ab4e012489ef 66
davidr99 0:ab4e012489ef 67 uint8_t RH_NRF24::spiWriteRegister(uint8_t reg, uint8_t val)
davidr99 0:ab4e012489ef 68 {
davidr99 0:ab4e012489ef 69 return spiWrite((reg & RH_NRF24_REGISTER_MASK) | RH_NRF24_COMMAND_W_REGISTER, val);
davidr99 0:ab4e012489ef 70 }
davidr99 0:ab4e012489ef 71
davidr99 0:ab4e012489ef 72 uint8_t RH_NRF24::spiBurstReadRegister(uint8_t reg, uint8_t* dest, uint8_t len)
davidr99 0:ab4e012489ef 73 {
davidr99 0:ab4e012489ef 74 return spiBurstRead((reg & RH_NRF24_REGISTER_MASK) | RH_NRF24_COMMAND_R_REGISTER, dest, len);
davidr99 0:ab4e012489ef 75 }
davidr99 0:ab4e012489ef 76
davidr99 0:ab4e012489ef 77 uint8_t RH_NRF24::spiBurstWriteRegister(uint8_t reg, uint8_t* src, uint8_t len)
davidr99 0:ab4e012489ef 78 {
davidr99 0:ab4e012489ef 79 return spiBurstWrite((reg & RH_NRF24_REGISTER_MASK) | RH_NRF24_COMMAND_W_REGISTER, src, len);
davidr99 0:ab4e012489ef 80 }
davidr99 0:ab4e012489ef 81
davidr99 0:ab4e012489ef 82 uint8_t RH_NRF24::statusRead()
davidr99 0:ab4e012489ef 83 {
davidr99 0:ab4e012489ef 84 // status is a side-effect of NOP, faster than reading reg 07
davidr99 0:ab4e012489ef 85 return spiCommand(RH_NRF24_COMMAND_NOP);
davidr99 0:ab4e012489ef 86 }
davidr99 0:ab4e012489ef 87
davidr99 0:ab4e012489ef 88 uint8_t RH_NRF24::flushTx()
davidr99 0:ab4e012489ef 89 {
davidr99 0:ab4e012489ef 90 return spiCommand(RH_NRF24_COMMAND_FLUSH_TX);
davidr99 0:ab4e012489ef 91 }
davidr99 0:ab4e012489ef 92
davidr99 0:ab4e012489ef 93 uint8_t RH_NRF24::flushRx()
davidr99 0:ab4e012489ef 94 {
davidr99 0:ab4e012489ef 95 return spiCommand(RH_NRF24_COMMAND_FLUSH_RX);
davidr99 0:ab4e012489ef 96 }
davidr99 0:ab4e012489ef 97
davidr99 0:ab4e012489ef 98 bool RH_NRF24::setChannel(uint8_t channel)
davidr99 0:ab4e012489ef 99 {
davidr99 0:ab4e012489ef 100 spiWriteRegister(RH_NRF24_REG_05_RF_CH, channel & RH_NRF24_RF_CH);
davidr99 0:ab4e012489ef 101 return true;
davidr99 0:ab4e012489ef 102 }
davidr99 0:ab4e012489ef 103
davidr99 0:ab4e012489ef 104 bool RH_NRF24::setOpMode(uint8_t mode)
davidr99 0:ab4e012489ef 105 {
davidr99 0:ab4e012489ef 106 _configuration = mode;
davidr99 0:ab4e012489ef 107 return true;
davidr99 0:ab4e012489ef 108 }
davidr99 0:ab4e012489ef 109
davidr99 0:ab4e012489ef 110 bool RH_NRF24::setNetworkAddress(uint8_t* address, uint8_t len)
davidr99 0:ab4e012489ef 111 {
davidr99 0:ab4e012489ef 112 if (len < 3 || len > 5)
davidr99 0:ab4e012489ef 113 return false;
davidr99 0:ab4e012489ef 114
davidr99 0:ab4e012489ef 115 // Set both TX_ADDR and RX_ADDR_P0 for auto-ack with Enhanced shockwave
davidr99 0:ab4e012489ef 116 spiWriteRegister(RH_NRF24_REG_03_SETUP_AW, len-2); // Mapping [3..5] = [1..3]
davidr99 0:ab4e012489ef 117 spiBurstWriteRegister(RH_NRF24_REG_0A_RX_ADDR_P0, address, len);
davidr99 0:ab4e012489ef 118 spiBurstWriteRegister(RH_NRF24_REG_10_TX_ADDR, address, len);
davidr99 0:ab4e012489ef 119 return true;
davidr99 0:ab4e012489ef 120 }
davidr99 0:ab4e012489ef 121
davidr99 0:ab4e012489ef 122 bool RH_NRF24::setRF(DataRate data_rate, TransmitPower power)
davidr99 0:ab4e012489ef 123 {
davidr99 0:ab4e012489ef 124 uint8_t value = (power << 1) & RH_NRF24_PWR;
davidr99 0:ab4e012489ef 125 // Ugly mapping of data rates to noncontiguous 2 bits:
davidr99 0:ab4e012489ef 126 if (data_rate == DataRate250kbps)
davidr99 0:ab4e012489ef 127 value |= RH_NRF24_RF_DR_LOW;
davidr99 0:ab4e012489ef 128 else if (data_rate == DataRate2Mbps)
davidr99 0:ab4e012489ef 129 value |= RH_NRF24_RF_DR_HIGH;
davidr99 0:ab4e012489ef 130 // else DataRate1Mbps, 00
davidr99 0:ab4e012489ef 131
davidr99 0:ab4e012489ef 132 // RFM73 needs this:
davidr99 0:ab4e012489ef 133 value |= RH_NRF24_LNA_HCURR;
davidr99 0:ab4e012489ef 134
davidr99 0:ab4e012489ef 135 spiWriteRegister(RH_NRF24_REG_06_RF_SETUP, value);
davidr99 0:ab4e012489ef 136 // If we were using auto-ack, we would have to set the appropriate timeout in reg 4 here
davidr99 0:ab4e012489ef 137 // see NRF24::setRF()
davidr99 0:ab4e012489ef 138 return true;
davidr99 0:ab4e012489ef 139 }
davidr99 0:ab4e012489ef 140
davidr99 0:ab4e012489ef 141 void RH_NRF24::setModeIdle()
davidr99 0:ab4e012489ef 142 {
davidr99 0:ab4e012489ef 143 if (_mode != RHModeIdle)
davidr99 0:ab4e012489ef 144 {
davidr99 0:ab4e012489ef 145 spiWriteRegister(RH_NRF24_REG_00_CONFIG, _configuration);
davidr99 0:ab4e012489ef 146 digitalWrite(_chipEnablePin, LOW);
davidr99 0:ab4e012489ef 147 _mode = RHModeIdle;
davidr99 0:ab4e012489ef 148 }
davidr99 0:ab4e012489ef 149 }
davidr99 0:ab4e012489ef 150
davidr99 0:ab4e012489ef 151 bool RH_NRF24::sleep()
davidr99 0:ab4e012489ef 152 {
davidr99 0:ab4e012489ef 153 if (_mode != RHModeSleep)
davidr99 0:ab4e012489ef 154 {
davidr99 0:ab4e012489ef 155 spiWriteRegister(RH_NRF24_REG_00_CONFIG, 0); // Power Down mode
davidr99 0:ab4e012489ef 156 digitalWrite(_chipEnablePin, LOW);
davidr99 0:ab4e012489ef 157 _mode = RHModeSleep;
davidr99 0:ab4e012489ef 158 }
davidr99 0:ab4e012489ef 159 }
davidr99 0:ab4e012489ef 160
davidr99 0:ab4e012489ef 161 void RH_NRF24::setModeRx()
davidr99 0:ab4e012489ef 162 {
davidr99 0:ab4e012489ef 163 if (_mode != RHModeRx)
davidr99 0:ab4e012489ef 164 {
davidr99 0:ab4e012489ef 165 spiWriteRegister(RH_NRF24_REG_00_CONFIG, _configuration | RH_NRF24_PWR_UP | RH_NRF24_PRIM_RX);
davidr99 0:ab4e012489ef 166 digitalWrite(_chipEnablePin, HIGH);
davidr99 0:ab4e012489ef 167 _mode = RHModeRx;
davidr99 0:ab4e012489ef 168 }
davidr99 0:ab4e012489ef 169 }
davidr99 0:ab4e012489ef 170
davidr99 0:ab4e012489ef 171 void RH_NRF24::setModeTx()
davidr99 0:ab4e012489ef 172 {
davidr99 0:ab4e012489ef 173 if (_mode != RHModeTx)
davidr99 0:ab4e012489ef 174 {
davidr99 0:ab4e012489ef 175 // Its the CE rising edge that puts us into TX mode
davidr99 0:ab4e012489ef 176 // CE staying high makes us go to standby-II when the packet is sent
davidr99 0:ab4e012489ef 177 digitalWrite(_chipEnablePin, LOW);
davidr99 0:ab4e012489ef 178 // Ensure DS is not set
davidr99 0:ab4e012489ef 179 spiWriteRegister(RH_NRF24_REG_07_STATUS, RH_NRF24_TX_DS | RH_NRF24_MAX_RT);
davidr99 0:ab4e012489ef 180 spiWriteRegister(RH_NRF24_REG_00_CONFIG, _configuration | RH_NRF24_PWR_UP);
davidr99 0:ab4e012489ef 181 digitalWrite(_chipEnablePin, HIGH);
davidr99 0:ab4e012489ef 182 _mode = RHModeTx;
davidr99 0:ab4e012489ef 183 }
davidr99 0:ab4e012489ef 184 }
davidr99 0:ab4e012489ef 185
davidr99 0:ab4e012489ef 186 bool RH_NRF24::send(const uint8_t* data, uint8_t len)
davidr99 0:ab4e012489ef 187 {
davidr99 0:ab4e012489ef 188 if (len > RH_NRF24_MAX_MESSAGE_LEN)
davidr99 0:ab4e012489ef 189 return false;
davidr99 0:ab4e012489ef 190 // Set up the headers
davidr99 0:ab4e012489ef 191 _buf[0] = _txHeaderTo;
davidr99 0:ab4e012489ef 192 _buf[1] = _txHeaderFrom;
davidr99 0:ab4e012489ef 193 _buf[2] = _txHeaderId;
davidr99 0:ab4e012489ef 194 _buf[3] = _txHeaderFlags;
davidr99 0:ab4e012489ef 195 memcpy(_buf+RH_NRF24_HEADER_LEN, data, len);
davidr99 0:ab4e012489ef 196 spiBurstWrite(RH_NRF24_COMMAND_W_TX_PAYLOAD_NOACK, _buf, len + RH_NRF24_HEADER_LEN);
davidr99 0:ab4e012489ef 197 setModeTx();
davidr99 0:ab4e012489ef 198 // Radio will return to Standby II mode after transmission is complete
davidr99 0:ab4e012489ef 199 _txGood++;
davidr99 0:ab4e012489ef 200 return true;
davidr99 0:ab4e012489ef 201 }
davidr99 0:ab4e012489ef 202
davidr99 0:ab4e012489ef 203 bool RH_NRF24::waitPacketSent()
davidr99 0:ab4e012489ef 204 {
davidr99 0:ab4e012489ef 205 // If we are not currently in transmit mode, there is no packet to wait for
davidr99 0:ab4e012489ef 206 if (_mode != RHModeTx)
davidr99 0:ab4e012489ef 207 return false;
davidr99 0:ab4e012489ef 208
davidr99 0:ab4e012489ef 209 // Wait for either the Data Sent or Max ReTries flag, signalling the
davidr99 0:ab4e012489ef 210 // end of transmission
davidr99 0:ab4e012489ef 211 // We dont actually use auto-ack, so prob dont expect to see RH_NRF24_MAX_RT
davidr99 0:ab4e012489ef 212 uint8_t status;
davidr99 0:ab4e012489ef 213 while (!((status = statusRead()) & (RH_NRF24_TX_DS | RH_NRF24_MAX_RT)))
davidr99 0:ab4e012489ef 214 YIELD;
davidr99 0:ab4e012489ef 215
davidr99 0:ab4e012489ef 216 // Must clear RH_NRF24_MAX_RT if it is set, else no further comm
davidr99 0:ab4e012489ef 217 if (status & RH_NRF24_MAX_RT)
davidr99 0:ab4e012489ef 218 flushTx();
davidr99 0:ab4e012489ef 219 setModeIdle();
davidr99 0:ab4e012489ef 220 spiWriteRegister(RH_NRF24_REG_07_STATUS, RH_NRF24_TX_DS | RH_NRF24_MAX_RT);
davidr99 0:ab4e012489ef 221 // Return true if data sent, false if MAX_RT
davidr99 0:ab4e012489ef 222 return status & RH_NRF24_TX_DS;
davidr99 0:ab4e012489ef 223 }
davidr99 0:ab4e012489ef 224
davidr99 0:ab4e012489ef 225 bool RH_NRF24::isSending()
davidr99 0:ab4e012489ef 226 {
davidr99 0:ab4e012489ef 227 return !(spiReadRegister(RH_NRF24_REG_00_CONFIG) & RH_NRF24_PRIM_RX) &&
davidr99 0:ab4e012489ef 228 !(statusRead() & (RH_NRF24_TX_DS | RH_NRF24_MAX_RT));
davidr99 0:ab4e012489ef 229 }
davidr99 0:ab4e012489ef 230
davidr99 0:ab4e012489ef 231 bool RH_NRF24::printRegisters()
davidr99 0:ab4e012489ef 232 {
davidr99 0:ab4e012489ef 233 #ifdef RH_HAVE_SERIAL
davidr99 0:ab4e012489ef 234 // Iterate over register range, but don't process registers not in use.
davidr99 0:ab4e012489ef 235 for (uint8_t r = RH_NRF24_REG_00_CONFIG; r <= RH_NRF24_REG_1D_FEATURE; r++)
davidr99 0:ab4e012489ef 236 {
davidr99 0:ab4e012489ef 237 if ((r <= RH_NRF24_REG_17_FIFO_STATUS) || (r >= RH_NRF24_REG_1C_DYNPD))
davidr99 0:ab4e012489ef 238 {
davidr99 0:ab4e012489ef 239 Serial.print(r, HEX);
davidr99 0:ab4e012489ef 240 Serial.print(": ");
davidr99 0:ab4e012489ef 241 uint8_t len = 1;
davidr99 0:ab4e012489ef 242 // Address registers are 5 bytes in size
davidr99 0:ab4e012489ef 243 if ( (RH_NRF24_REG_0A_RX_ADDR_P0 == r)
davidr99 0:ab4e012489ef 244 || (RH_NRF24_REG_0B_RX_ADDR_P1 == r)
davidr99 0:ab4e012489ef 245 || (RH_NRF24_REG_10_TX_ADDR == r) )
davidr99 0:ab4e012489ef 246 {
davidr99 0:ab4e012489ef 247 len = 5;
davidr99 0:ab4e012489ef 248 }
davidr99 0:ab4e012489ef 249 uint8_t buf[5];
davidr99 0:ab4e012489ef 250 spiBurstReadRegister(r, buf, len);
davidr99 0:ab4e012489ef 251 for (uint8_t j = 0; j < len; ++j)
davidr99 0:ab4e012489ef 252 {
davidr99 0:ab4e012489ef 253 Serial.print(buf[j], HEX);
davidr99 0:ab4e012489ef 254 Serial.print(" ");
davidr99 0:ab4e012489ef 255 }
davidr99 0:ab4e012489ef 256 Serial.println("");
davidr99 0:ab4e012489ef 257 }
davidr99 0:ab4e012489ef 258 }
davidr99 0:ab4e012489ef 259 #endif
davidr99 0:ab4e012489ef 260
davidr99 0:ab4e012489ef 261 return true;
davidr99 0:ab4e012489ef 262 }
davidr99 0:ab4e012489ef 263
davidr99 0:ab4e012489ef 264 // Check whether the latest received message is complete and uncorrupted
davidr99 0:ab4e012489ef 265 void RH_NRF24::validateRxBuf()
davidr99 0:ab4e012489ef 266 {
davidr99 0:ab4e012489ef 267 if (_bufLen < 4)
davidr99 0:ab4e012489ef 268 return; // Too short to be a real message
davidr99 0:ab4e012489ef 269 // Extract the 4 headers
davidr99 0:ab4e012489ef 270 _rxHeaderTo = _buf[0];
davidr99 0:ab4e012489ef 271 _rxHeaderFrom = _buf[1];
davidr99 0:ab4e012489ef 272 _rxHeaderId = _buf[2];
davidr99 0:ab4e012489ef 273 _rxHeaderFlags = _buf[3];
davidr99 0:ab4e012489ef 274 if (_promiscuous ||
davidr99 0:ab4e012489ef 275 _rxHeaderTo == _thisAddress ||
davidr99 0:ab4e012489ef 276 _rxHeaderTo == RH_BROADCAST_ADDRESS)
davidr99 0:ab4e012489ef 277 {
davidr99 0:ab4e012489ef 278 _rxGood++;
davidr99 0:ab4e012489ef 279 _rxBufValid = true;
davidr99 0:ab4e012489ef 280 }
davidr99 0:ab4e012489ef 281 }
davidr99 0:ab4e012489ef 282
davidr99 0:ab4e012489ef 283 bool RH_NRF24::available()
davidr99 0:ab4e012489ef 284 {
davidr99 0:ab4e012489ef 285 if (!_rxBufValid)
davidr99 0:ab4e012489ef 286 {
davidr99 0:ab4e012489ef 287 if (_mode == RHModeTx)
davidr99 0:ab4e012489ef 288 return false;
davidr99 0:ab4e012489ef 289 setModeRx();
davidr99 0:ab4e012489ef 290 if (spiReadRegister(RH_NRF24_REG_17_FIFO_STATUS) & RH_NRF24_RX_EMPTY)
davidr99 0:ab4e012489ef 291 return false;
davidr99 0:ab4e012489ef 292 // Manual says that messages > 32 octets should be discarded
davidr99 0:ab4e012489ef 293 uint8_t len = spiRead(RH_NRF24_COMMAND_R_RX_PL_WID);
davidr99 0:ab4e012489ef 294 if (len > 32)
davidr99 0:ab4e012489ef 295 {
davidr99 0:ab4e012489ef 296 flushRx();
davidr99 0:ab4e012489ef 297 clearRxBuf();
davidr99 0:ab4e012489ef 298 setModeIdle();
davidr99 0:ab4e012489ef 299 return false;
davidr99 0:ab4e012489ef 300 }
davidr99 0:ab4e012489ef 301 // Clear read interrupt
davidr99 0:ab4e012489ef 302 spiWriteRegister(RH_NRF24_REG_07_STATUS, RH_NRF24_RX_DR);
davidr99 0:ab4e012489ef 303 // Get the message into the RX buffer, so we can inspect the headers
davidr99 0:ab4e012489ef 304 spiBurstRead(RH_NRF24_COMMAND_R_RX_PAYLOAD, _buf, len);
davidr99 0:ab4e012489ef 305 _bufLen = len;
davidr99 0:ab4e012489ef 306 // 140 microsecs (32 octet payload)
davidr99 0:ab4e012489ef 307 validateRxBuf();
davidr99 0:ab4e012489ef 308 if (_rxBufValid)
davidr99 0:ab4e012489ef 309 setModeIdle(); // Got one
davidr99 0:ab4e012489ef 310 }
davidr99 0:ab4e012489ef 311 return _rxBufValid;
davidr99 0:ab4e012489ef 312 }
davidr99 0:ab4e012489ef 313
davidr99 0:ab4e012489ef 314 void RH_NRF24::clearRxBuf()
davidr99 0:ab4e012489ef 315 {
davidr99 0:ab4e012489ef 316 _rxBufValid = false;
davidr99 0:ab4e012489ef 317 _bufLen = 0;
davidr99 0:ab4e012489ef 318 }
davidr99 0:ab4e012489ef 319
davidr99 0:ab4e012489ef 320 bool RH_NRF24::recv(uint8_t* buf, uint8_t* len)
davidr99 0:ab4e012489ef 321 {
davidr99 0:ab4e012489ef 322 if (!available())
davidr99 0:ab4e012489ef 323 return false;
davidr99 0:ab4e012489ef 324 if (buf && len)
davidr99 0:ab4e012489ef 325 {
davidr99 0:ab4e012489ef 326 // Skip the 4 headers that are at the beginning of the rxBuf
davidr99 0:ab4e012489ef 327 if (*len > _bufLen-RH_NRF24_HEADER_LEN)
davidr99 0:ab4e012489ef 328 *len = _bufLen-RH_NRF24_HEADER_LEN;
davidr99 0:ab4e012489ef 329 memcpy(buf, _buf+RH_NRF24_HEADER_LEN, *len);
davidr99 0:ab4e012489ef 330 }
davidr99 0:ab4e012489ef 331 clearRxBuf(); // This message accepted and cleared
davidr99 0:ab4e012489ef 332 return true;
davidr99 0:ab4e012489ef 333 }
davidr99 0:ab4e012489ef 334
davidr99 0:ab4e012489ef 335 uint8_t RH_NRF24::maxMessageLength()
davidr99 0:ab4e012489ef 336 {
davidr99 0:ab4e012489ef 337 return RH_NRF24_MAX_MESSAGE_LEN;
davidr99 0:ab4e012489ef 338 }