Shuto Naruse
The presence of rtos library, and line 294 in RF12B.cpp causes a crash when ISR occurs on falling edge on pin 9.
RF12B.cpp@0:b4c2aa657754, 2012-03-25 (annotated)
- Committer:
- narshu
- Date:
- Sun Mar 25 20:14:41 2012 +0000
- Revision:
- 0:b4c2aa657754
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| narshu | 0:b4c2aa657754 | 1 | #include "RF12B.h" |
| narshu | 0:b4c2aa657754 | 2 | |
| narshu | 0:b4c2aa657754 | 3 | #include "RF_defs.h" |
| narshu | 0:b4c2aa657754 | 4 | #include <algorithm> |
| narshu | 0:b4c2aa657754 | 5 | |
| narshu | 0:b4c2aa657754 | 6 | //#include "globals.h" |
| narshu | 0:b4c2aa657754 | 7 | |
| narshu | 0:b4c2aa657754 | 8 | DigitalOut DBG2(LED2); |
| narshu | 0:b4c2aa657754 | 9 | DigitalOut DBG3(LED3); |
| narshu | 0:b4c2aa657754 | 10 | DigitalOut DBG4(LED4); |
| narshu | 0:b4c2aa657754 | 11 | |
| narshu | 0:b4c2aa657754 | 12 | RF12B::RF12B(PinName _SDI, |
| narshu | 0:b4c2aa657754 | 13 | PinName _SDO, |
| narshu | 0:b4c2aa657754 | 14 | PinName _SCK, |
| narshu | 0:b4c2aa657754 | 15 | PinName _NCS, |
| narshu | 0:b4c2aa657754 | 16 | PinName _NIRQ):spi(_SDI, _SDO, _SCK), |
| narshu | 0:b4c2aa657754 | 17 | NCS(_NCS), NIRQ(_NIRQ), NIRQ_in(_NIRQ){// rfled(LED3) { |
| narshu | 0:b4c2aa657754 | 18 | |
| narshu | 0:b4c2aa657754 | 19 | /* SPI frequency, word lenght, polarity and phase */ |
| narshu | 0:b4c2aa657754 | 20 | spi.format(16,0); |
| narshu | 0:b4c2aa657754 | 21 | spi.frequency(2000000); |
| narshu | 0:b4c2aa657754 | 22 | |
| narshu | 0:b4c2aa657754 | 23 | /* Set ~CS high */ |
| narshu | 0:b4c2aa657754 | 24 | NCS = 1; |
| narshu | 0:b4c2aa657754 | 25 | |
| narshu | 0:b4c2aa657754 | 26 | /* Initialise RF Module */ |
| narshu | 0:b4c2aa657754 | 27 | init(); |
| narshu | 0:b4c2aa657754 | 28 | |
| narshu | 0:b4c2aa657754 | 29 | /* Setup interrupt to happen on falling edge of NIRQ */ |
| narshu | 0:b4c2aa657754 | 30 | NIRQ.fall(this, &RF12B::rxISR); |
| narshu | 0:b4c2aa657754 | 31 | |
| narshu | 0:b4c2aa657754 | 32 | |
| narshu | 0:b4c2aa657754 | 33 | } |
| narshu | 0:b4c2aa657754 | 34 | |
| narshu | 0:b4c2aa657754 | 35 | /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/ |
| narshu | 0:b4c2aa657754 | 36 | unsigned int RF12B::available() { |
| narshu | 0:b4c2aa657754 | 37 | return fifo.size(); |
| narshu | 0:b4c2aa657754 | 38 | } |
| narshu | 0:b4c2aa657754 | 39 | |
| narshu | 0:b4c2aa657754 | 40 | /* Reads a packet of data, with length "size" Returns false if read failed. TODO: make a metafifo to isolate packets*/ |
| narshu | 0:b4c2aa657754 | 41 | bool RF12B::read(unsigned char* data, unsigned int size) { |
| narshu | 0:b4c2aa657754 | 42 | if (fifo.size() == 0) { |
| narshu | 0:b4c2aa657754 | 43 | return false; |
| narshu | 0:b4c2aa657754 | 44 | } else { |
| narshu | 0:b4c2aa657754 | 45 | unsigned int i = 0; |
| narshu | 0:b4c2aa657754 | 46 | while (fifo.size() > 0 && i < size) { |
| narshu | 0:b4c2aa657754 | 47 | data[i++] = fifo.front(); |
| narshu | 0:b4c2aa657754 | 48 | fifo.pop(); |
| narshu | 0:b4c2aa657754 | 49 | } |
| narshu | 0:b4c2aa657754 | 50 | return true; |
| narshu | 0:b4c2aa657754 | 51 | } |
| narshu | 0:b4c2aa657754 | 52 | } |
| narshu | 0:b4c2aa657754 | 53 | |
| narshu | 0:b4c2aa657754 | 54 | /* Reads a byte of data from the receive buffer */ |
| narshu | 0:b4c2aa657754 | 55 | unsigned char RF12B::read() { |
| narshu | 0:b4c2aa657754 | 56 | if (available()) { |
| narshu | 0:b4c2aa657754 | 57 | unsigned char data = fifo.front(); |
| narshu | 0:b4c2aa657754 | 58 | fifo.pop(); |
| narshu | 0:b4c2aa657754 | 59 | return data; |
| narshu | 0:b4c2aa657754 | 60 | } else { |
| narshu | 0:b4c2aa657754 | 61 | return 0xFF; // Error val although could also be data... |
| narshu | 0:b4c2aa657754 | 62 | } |
| narshu | 0:b4c2aa657754 | 63 | } |
| narshu | 0:b4c2aa657754 | 64 | |
| narshu | 0:b4c2aa657754 | 65 | /* Sends a packet of data to the RF module for transmission TODO: Make asych*/ |
| narshu | 0:b4c2aa657754 | 66 | void RF12B::write(unsigned char *data, unsigned char length) { |
| narshu | 0:b4c2aa657754 | 67 | unsigned char crc = 0; |
| narshu | 0:b4c2aa657754 | 68 | |
| narshu | 0:b4c2aa657754 | 69 | /* Transmitter mode */ |
| narshu | 0:b4c2aa657754 | 70 | changeMode(TX); |
| narshu | 0:b4c2aa657754 | 71 | |
| narshu | 0:b4c2aa657754 | 72 | writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 73 | send(0xAA); // PREAMBLE |
| narshu | 0:b4c2aa657754 | 74 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 75 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 76 | send(0x2D); // SYNC |
| narshu | 0:b4c2aa657754 | 77 | send(0xD4); |
| narshu | 0:b4c2aa657754 | 78 | /* Packet Length */ |
| narshu | 0:b4c2aa657754 | 79 | send(length); |
| narshu | 0:b4c2aa657754 | 80 | crc = crc8(crc, length); |
| narshu | 0:b4c2aa657754 | 81 | send(crc); |
| narshu | 0:b4c2aa657754 | 82 | crc = crc8(crc, crc); |
| narshu | 0:b4c2aa657754 | 83 | /* Packet Data */ |
| narshu | 0:b4c2aa657754 | 84 | for (unsigned char i=0; i<length; i++) { |
| narshu | 0:b4c2aa657754 | 85 | send(data[i]); |
| narshu | 0:b4c2aa657754 | 86 | crc = crc8(crc, data[i]); |
| narshu | 0:b4c2aa657754 | 87 | } |
| narshu | 0:b4c2aa657754 | 88 | send(crc); |
| narshu | 0:b4c2aa657754 | 89 | send(0xAA); // DUMMY BYTES |
| narshu | 0:b4c2aa657754 | 90 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 91 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 92 | |
| narshu | 0:b4c2aa657754 | 93 | /* Back to receiver mode */ |
| narshu | 0:b4c2aa657754 | 94 | changeMode(RX); |
| narshu | 0:b4c2aa657754 | 95 | status(); |
| narshu | 0:b4c2aa657754 | 96 | |
| narshu | 0:b4c2aa657754 | 97 | |
| narshu | 0:b4c2aa657754 | 98 | } |
| narshu | 0:b4c2aa657754 | 99 | |
| narshu | 0:b4c2aa657754 | 100 | /* Transmit a 1-byte data packet */ |
| narshu | 0:b4c2aa657754 | 101 | void RF12B::write(unsigned char data) { |
| narshu | 0:b4c2aa657754 | 102 | write(&data, 1); |
| narshu | 0:b4c2aa657754 | 103 | } |
| narshu | 0:b4c2aa657754 | 104 | |
| narshu | 0:b4c2aa657754 | 105 | void RF12B::write(queue<char> &data, int length) { |
| narshu | 0:b4c2aa657754 | 106 | char crc = 0; |
| narshu | 0:b4c2aa657754 | 107 | char length_byte = 0; |
| narshu | 0:b4c2aa657754 | 108 | |
| narshu | 0:b4c2aa657754 | 109 | /* -1 means try to transmit everything in the queue */ |
| narshu | 0:b4c2aa657754 | 110 | if(length == -1) { |
| narshu | 0:b4c2aa657754 | 111 | length = data.size(); |
| narshu | 0:b4c2aa657754 | 112 | } |
| narshu | 0:b4c2aa657754 | 113 | |
| narshu | 0:b4c2aa657754 | 114 | /* max length of packet is 255 */ |
| narshu | 0:b4c2aa657754 | 115 | length_byte = min(length, 255); |
| narshu | 0:b4c2aa657754 | 116 | |
| narshu | 0:b4c2aa657754 | 117 | /* Transmitter mode */ |
| narshu | 0:b4c2aa657754 | 118 | changeMode(TX); |
| narshu | 0:b4c2aa657754 | 119 | |
| narshu | 0:b4c2aa657754 | 120 | writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 121 | send(0xAA); // PREAMBLE |
| narshu | 0:b4c2aa657754 | 122 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 123 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 124 | send(0x2D); // SYNC |
| narshu | 0:b4c2aa657754 | 125 | send(0xD4); |
| narshu | 0:b4c2aa657754 | 126 | /* Packet Length */ |
| narshu | 0:b4c2aa657754 | 127 | send(length_byte); |
| narshu | 0:b4c2aa657754 | 128 | crc = crc8(crc, length_byte); |
| narshu | 0:b4c2aa657754 | 129 | send(crc); |
| narshu | 0:b4c2aa657754 | 130 | crc = crc8(crc, crc); |
| narshu | 0:b4c2aa657754 | 131 | /* Packet Data */ |
| narshu | 0:b4c2aa657754 | 132 | for (char i=0; i<length_byte; i++) { |
| narshu | 0:b4c2aa657754 | 133 | send(data.front()); |
| narshu | 0:b4c2aa657754 | 134 | crc = crc8(crc, data.front()); |
| narshu | 0:b4c2aa657754 | 135 | data.pop(); |
| narshu | 0:b4c2aa657754 | 136 | } |
| narshu | 0:b4c2aa657754 | 137 | send(crc); |
| narshu | 0:b4c2aa657754 | 138 | send(0xAA); // DUMMY BYTES |
| narshu | 0:b4c2aa657754 | 139 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 140 | send(0xAA); |
| narshu | 0:b4c2aa657754 | 141 | |
| narshu | 0:b4c2aa657754 | 142 | /* Back to receiver mode */ |
| narshu | 0:b4c2aa657754 | 143 | changeMode(RX); |
| narshu | 0:b4c2aa657754 | 144 | status(); |
| narshu | 0:b4c2aa657754 | 145 | } |
| narshu | 0:b4c2aa657754 | 146 | |
| narshu | 0:b4c2aa657754 | 147 | /********************************************************************** |
| narshu | 0:b4c2aa657754 | 148 | * PRIVATE FUNCTIONS |
| narshu | 0:b4c2aa657754 | 149 | *********************************************************************/ |
| narshu | 0:b4c2aa657754 | 150 | |
| narshu | 0:b4c2aa657754 | 151 | /* Initialises the RF12B module */ |
| narshu | 0:b4c2aa657754 | 152 | void RF12B::init() { |
| narshu | 0:b4c2aa657754 | 153 | /* writeCmd(0x80E7); //EL,EF,868band,12.0pF |
| narshu | 0:b4c2aa657754 | 154 | changeMode(RX); |
| narshu | 0:b4c2aa657754 | 155 | writeCmd(0xA640); //frequency select |
| narshu | 0:b4c2aa657754 | 156 | writeCmd(0xC647); //4.8kbps |
| narshu | 0:b4c2aa657754 | 157 | writeCmd(0x94A0); //VDI,FAST,134kHz,0dBm,-103dBm |
| narshu | 0:b4c2aa657754 | 158 | writeCmd(0xC2AC); //AL,!ml,DIG,DQD4 |
| narshu | 0:b4c2aa657754 | 159 | writeCmd(0xCA81); //FIFO8,SYNC,!ff,DR |
| narshu | 0:b4c2aa657754 | 160 | writeCmd(0xCED4); //SYNC=2DD4 |
| narshu | 0:b4c2aa657754 | 161 | writeCmd(0xC483); //@PWR,NO RSTRIC,!st,!fi,OE,EN |
| narshu | 0:b4c2aa657754 | 162 | writeCmd(0x9850); //!mp,90kHz,MAX OUT |
| narshu | 0:b4c2aa657754 | 163 | writeCmd(0xCC17); //OB1, COB0, LPX, Iddy, CDDIT�CBW0 |
| narshu | 0:b4c2aa657754 | 164 | writeCmd(0xE000); //NOT USED |
| narshu | 0:b4c2aa657754 | 165 | writeCmd(0xC800); //NOT USED |
| narshu | 0:b4c2aa657754 | 166 | writeCmd(0xC040); //1.66MHz,2.2V */ |
| narshu | 0:b4c2aa657754 | 167 | |
| narshu | 0:b4c2aa657754 | 168 | writeCmd( |
| narshu | 0:b4c2aa657754 | 169 | RFM_CONFIG_EL | |
| narshu | 0:b4c2aa657754 | 170 | RFM_CONFIG_EF | |
| narshu | 0:b4c2aa657754 | 171 | RFM_CONFIG_BAND_433 //| |
| narshu | 0:b4c2aa657754 | 172 | //RFM_CONFIG_X_11_0pf // meh, using default |
| narshu | 0:b4c2aa657754 | 173 | ); |
| narshu | 0:b4c2aa657754 | 174 | |
| narshu | 0:b4c2aa657754 | 175 | // 2. Power Management Command |
| narshu | 0:b4c2aa657754 | 176 | // leave everything switched off for now |
| narshu | 0:b4c2aa657754 | 177 | /* |
| narshu | 0:b4c2aa657754 | 178 | writeCmd( |
| narshu | 0:b4c2aa657754 | 179 | RFM_POWER_MANAGEMENT // switch all off |
| narshu | 0:b4c2aa657754 | 180 | ); |
| narshu | 0:b4c2aa657754 | 181 | */ |
| narshu | 0:b4c2aa657754 | 182 | |
| narshu | 0:b4c2aa657754 | 183 | // 3. Frequency Setting Command |
| narshu | 0:b4c2aa657754 | 184 | writeCmd( |
| narshu | 0:b4c2aa657754 | 185 | RFM_FREQUENCY | |
| narshu | 0:b4c2aa657754 | 186 | RFM_FREQ_433Band(435.7) //I totally made this value up... if someone knows where the sweetspots are in this band, tell me! |
| narshu | 0:b4c2aa657754 | 187 | ); |
| narshu | 0:b4c2aa657754 | 188 | |
| narshu | 0:b4c2aa657754 | 189 | |
| narshu | 0:b4c2aa657754 | 190 | // 4. Data Rate Command |
| narshu | 0:b4c2aa657754 | 191 | writeCmd(RFM_DATA_RATE_9600); |
| narshu | 0:b4c2aa657754 | 192 | |
| narshu | 0:b4c2aa657754 | 193 | |
| narshu | 0:b4c2aa657754 | 194 | // 5. Receiver Control Command |
| narshu | 0:b4c2aa657754 | 195 | writeCmd( |
| narshu | 0:b4c2aa657754 | 196 | RFM_RX_CONTROL_P20_VDI | |
| narshu | 0:b4c2aa657754 | 197 | RFM_RX_CONTROL_VDI_FAST | |
| narshu | 0:b4c2aa657754 | 198 | //RFM_RX_CONTROL_BW(RFM_BAUD_RATE) | |
| narshu | 0:b4c2aa657754 | 199 | RFM_RX_CONTROL_BW_134 | // CHANGE THIS TO 67 TO IMPROVE RANGE! (though the bitrate must then be below 8kbaud, and fsk modulation changed) |
| narshu | 0:b4c2aa657754 | 200 | RFM_RX_CONTROL_GAIN_0 | |
| narshu | 0:b4c2aa657754 | 201 | RFM_RX_CONTROL_RSSI_103 // Might need adjustment. Datasheet says around 10^-5 bit error rate at this level and baudrate. |
| narshu | 0:b4c2aa657754 | 202 | ); |
| narshu | 0:b4c2aa657754 | 203 | |
| narshu | 0:b4c2aa657754 | 204 | // 6. Data Filter Command |
| narshu | 0:b4c2aa657754 | 205 | writeCmd( |
| narshu | 0:b4c2aa657754 | 206 | RFM_DATA_FILTER_AL | |
| narshu | 0:b4c2aa657754 | 207 | RFM_DATA_FILTER_ML | |
| narshu | 0:b4c2aa657754 | 208 | RFM_DATA_FILTER_DIG //| |
| narshu | 0:b4c2aa657754 | 209 | //RFM_DATA_FILTER_DQD(4) |
| narshu | 0:b4c2aa657754 | 210 | ); |
| narshu | 0:b4c2aa657754 | 211 | |
| narshu | 0:b4c2aa657754 | 212 | // 7. FIFO and Reset Mode Command |
| narshu | 0:b4c2aa657754 | 213 | writeCmd( |
| narshu | 0:b4c2aa657754 | 214 | RFM_FIFO_IT(8) | |
| narshu | 0:b4c2aa657754 | 215 | RFM_FIFO_DR | |
| narshu | 0:b4c2aa657754 | 216 | 0x8 //turn on 16bit sync word |
| narshu | 0:b4c2aa657754 | 217 | ); |
| narshu | 0:b4c2aa657754 | 218 | |
| narshu | 0:b4c2aa657754 | 219 | // 8. FIFO Syncword |
| narshu | 0:b4c2aa657754 | 220 | // Leave as default: 0xD4 |
| narshu | 0:b4c2aa657754 | 221 | |
| narshu | 0:b4c2aa657754 | 222 | // 9. Receiver FIFO Read |
| narshu | 0:b4c2aa657754 | 223 | // when the interupt goes high, (and if we can assume that it was a fifo fill interrupt) we can read a byte using: |
| narshu | 0:b4c2aa657754 | 224 | // result = RFM_READ_FIFO(); |
| narshu | 0:b4c2aa657754 | 225 | |
| narshu | 0:b4c2aa657754 | 226 | // 10. AFC Command |
| narshu | 0:b4c2aa657754 | 227 | writeCmd( |
| narshu | 0:b4c2aa657754 | 228 | //RFM_AFC_AUTO_VDI | //Note this might be changed to improve range. Refer to datasheet. |
| narshu | 0:b4c2aa657754 | 229 | RFM_AFC_AUTO_INDEPENDENT | |
| narshu | 0:b4c2aa657754 | 230 | RFM_AFC_RANGE_LIMIT_7_8 | |
| narshu | 0:b4c2aa657754 | 231 | RFM_AFC_EN | |
| narshu | 0:b4c2aa657754 | 232 | RFM_AFC_OE | |
| narshu | 0:b4c2aa657754 | 233 | RFM_AFC_FI |
| narshu | 0:b4c2aa657754 | 234 | ); |
| narshu | 0:b4c2aa657754 | 235 | |
| narshu | 0:b4c2aa657754 | 236 | // 11. TX Configuration Control Command |
| narshu | 0:b4c2aa657754 | 237 | writeCmd( |
| narshu | 0:b4c2aa657754 | 238 | RFM_TX_CONTROL_MOD_60 | |
| narshu | 0:b4c2aa657754 | 239 | RFM_TX_CONTROL_POW_0 |
| narshu | 0:b4c2aa657754 | 240 | ); |
| narshu | 0:b4c2aa657754 | 241 | |
| narshu | 0:b4c2aa657754 | 242 | |
| narshu | 0:b4c2aa657754 | 243 | // 12. PLL Setting Command |
| narshu | 0:b4c2aa657754 | 244 | writeCmd( |
| narshu | 0:b4c2aa657754 | 245 | 0xCC77 & ~0x01 // Setting the PLL bandwith, less noise, but max bitrate capped at 86.2 |
| narshu | 0:b4c2aa657754 | 246 | // I think this will slow down the pll's reaction time. Not sure, check with someone! |
| narshu | 0:b4c2aa657754 | 247 | ); |
| narshu | 0:b4c2aa657754 | 248 | |
| narshu | 0:b4c2aa657754 | 249 | changeMode(RX); |
| narshu | 0:b4c2aa657754 | 250 | resetRX(); |
| narshu | 0:b4c2aa657754 | 251 | status(); |
| narshu | 0:b4c2aa657754 | 252 | } |
| narshu | 0:b4c2aa657754 | 253 | |
| narshu | 0:b4c2aa657754 | 254 | /* Write a command to the RF Module */ |
| narshu | 0:b4c2aa657754 | 255 | unsigned int RF12B::writeCmd(unsigned int cmd) { |
| narshu | 0:b4c2aa657754 | 256 | NCS = 0; |
| narshu | 0:b4c2aa657754 | 257 | unsigned int recv = spi.write(cmd); |
| narshu | 0:b4c2aa657754 | 258 | NCS = 1; |
| narshu | 0:b4c2aa657754 | 259 | return recv; |
| narshu | 0:b4c2aa657754 | 260 | } |
| narshu | 0:b4c2aa657754 | 261 | |
| narshu | 0:b4c2aa657754 | 262 | /* Sends a byte of data across RF */ |
| narshu | 0:b4c2aa657754 | 263 | void RF12B::send(unsigned char data) { |
| narshu | 0:b4c2aa657754 | 264 | while (NIRQ); |
| narshu | 0:b4c2aa657754 | 265 | writeCmd(0xB800 + data); |
| narshu | 0:b4c2aa657754 | 266 | } |
| narshu | 0:b4c2aa657754 | 267 | |
| narshu | 0:b4c2aa657754 | 268 | /* Change the mode of the RF module to Transmitting or Receiving */ |
| narshu | 0:b4c2aa657754 | 269 | void RF12B::changeMode(rfmode_t _mode) { |
| narshu | 0:b4c2aa657754 | 270 | mode = _mode; |
| narshu | 0:b4c2aa657754 | 271 | if (_mode == TX) { |
| narshu | 0:b4c2aa657754 | 272 | writeCmd(0x8239); //!er,!ebb,ET,ES,EX,!eb,!ew,DC |
| narshu | 0:b4c2aa657754 | 273 | } else { /* mode == RX */ |
| narshu | 0:b4c2aa657754 | 274 | writeCmd(0x8299); //er,!ebb,ET,ES,EX,!eb,!ew,DC |
| narshu | 0:b4c2aa657754 | 275 | } |
| narshu | 0:b4c2aa657754 | 276 | } |
| narshu | 0:b4c2aa657754 | 277 | |
| narshu | 0:b4c2aa657754 | 278 | /* Interrupt routine for data reception */ |
| narshu | 0:b4c2aa657754 | 279 | void RF12B::rxISR() { |
| narshu | 0:b4c2aa657754 | 280 | |
| narshu | 0:b4c2aa657754 | 281 | static int cnt = 0; |
| narshu | 0:b4c2aa657754 | 282 | //printf("%d hits\r\n", cnt); |
| narshu | 0:b4c2aa657754 | 283 | cnt++; |
| narshu | 0:b4c2aa657754 | 284 | |
| narshu | 0:b4c2aa657754 | 285 | DBG2 = !(cnt%3); |
| narshu | 0:b4c2aa657754 | 286 | DBG3 = !((cnt+1)%3); |
| narshu | 0:b4c2aa657754 | 287 | DBG4 = !((cnt+2)%3); |
| narshu | 0:b4c2aa657754 | 288 | |
| narshu | 0:b4c2aa657754 | 289 | |
| narshu | 0:b4c2aa657754 | 290 | unsigned int data = 0; |
| narshu | 0:b4c2aa657754 | 291 | static int i = -2; |
| narshu | 0:b4c2aa657754 | 292 | static unsigned char packet_length = 0; |
| narshu | 0:b4c2aa657754 | 293 | static unsigned char crc = 0; |
| narshu | 0:b4c2aa657754 | 294 | static queue<unsigned char> temp; |
| narshu | 0:b4c2aa657754 | 295 | |
| narshu | 0:b4c2aa657754 | 296 | |
| narshu | 0:b4c2aa657754 | 297 | //Loop while interrupt is asserted |
| narshu | 0:b4c2aa657754 | 298 | while (!NIRQ_in && mode == RX) { |
| narshu | 0:b4c2aa657754 | 299 | |
| narshu | 0:b4c2aa657754 | 300 | |
| narshu | 0:b4c2aa657754 | 301 | // Grab the packet's length byte |
| narshu | 0:b4c2aa657754 | 302 | if (i == -2) { |
| narshu | 0:b4c2aa657754 | 303 | data = writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 304 | if ( (data&0x8000) ) { |
| narshu | 0:b4c2aa657754 | 305 | data = writeCmd(0xB000); |
| narshu | 0:b4c2aa657754 | 306 | packet_length = (data&0x00FF); |
| narshu | 0:b4c2aa657754 | 307 | crc = crc8(crc, packet_length); |
| narshu | 0:b4c2aa657754 | 308 | i++; |
| narshu | 0:b4c2aa657754 | 309 | } |
| narshu | 0:b4c2aa657754 | 310 | } |
| narshu | 0:b4c2aa657754 | 311 | |
| narshu | 0:b4c2aa657754 | 312 | //If we exhaust the interrupt, exit |
| narshu | 0:b4c2aa657754 | 313 | if (NIRQ_in) |
| narshu | 0:b4c2aa657754 | 314 | break; |
| narshu | 0:b4c2aa657754 | 315 | |
| narshu | 0:b4c2aa657754 | 316 | // Check that packet length was correct |
| narshu | 0:b4c2aa657754 | 317 | if (i == -1) { |
| narshu | 0:b4c2aa657754 | 318 | data = writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 319 | if ( (data&0x8000) ) { |
| narshu | 0:b4c2aa657754 | 320 | data = writeCmd(0xB000); |
| narshu | 0:b4c2aa657754 | 321 | unsigned char crcofsize = (data&0x00FF); |
| narshu | 0:b4c2aa657754 | 322 | if (crcofsize != crc) { |
| narshu | 0:b4c2aa657754 | 323 | //It was wrong, start over |
| narshu | 0:b4c2aa657754 | 324 | i = -2; |
| narshu | 0:b4c2aa657754 | 325 | packet_length = 0; |
| narshu | 0:b4c2aa657754 | 326 | crc = 0; |
| narshu | 0:b4c2aa657754 | 327 | temp = queue<unsigned char>(); |
| narshu | 0:b4c2aa657754 | 328 | resetRX(); |
| narshu | 0:b4c2aa657754 | 329 | } else { |
| narshu | 0:b4c2aa657754 | 330 | crc = crc8(crc, crcofsize); |
| narshu | 0:b4c2aa657754 | 331 | i++; |
| narshu | 0:b4c2aa657754 | 332 | } |
| narshu | 0:b4c2aa657754 | 333 | } |
| narshu | 0:b4c2aa657754 | 334 | } |
| narshu | 0:b4c2aa657754 | 335 | |
| narshu | 0:b4c2aa657754 | 336 | //If we exhaust the interrupt, exit |
| narshu | 0:b4c2aa657754 | 337 | if (NIRQ_in) |
| narshu | 0:b4c2aa657754 | 338 | break; |
| narshu | 0:b4c2aa657754 | 339 | |
| narshu | 0:b4c2aa657754 | 340 | // Grab the packet's data |
| narshu | 0:b4c2aa657754 | 341 | if (i >= 0 && i < packet_length) { |
| narshu | 0:b4c2aa657754 | 342 | data = writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 343 | if ( (data&0x8000) ) { |
| narshu | 0:b4c2aa657754 | 344 | data = writeCmd(0xB000); |
| narshu | 0:b4c2aa657754 | 345 | temp.push(data&0x00FF); |
| narshu | 0:b4c2aa657754 | 346 | crc = crc8(crc, (unsigned char)(data&0x00FF)); |
| narshu | 0:b4c2aa657754 | 347 | i++; |
| narshu | 0:b4c2aa657754 | 348 | } |
| narshu | 0:b4c2aa657754 | 349 | } |
| narshu | 0:b4c2aa657754 | 350 | |
| narshu | 0:b4c2aa657754 | 351 | //If we exhaust the interrupt, exit |
| narshu | 0:b4c2aa657754 | 352 | if (NIRQ_in) |
| narshu | 0:b4c2aa657754 | 353 | break; |
| narshu | 0:b4c2aa657754 | 354 | |
| narshu | 0:b4c2aa657754 | 355 | if (i >= packet_length) { |
| narshu | 0:b4c2aa657754 | 356 | data = writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 357 | if ( (data&0x8000) ) { |
| narshu | 0:b4c2aa657754 | 358 | data = writeCmd(0xB000); |
| narshu | 0:b4c2aa657754 | 359 | if ((unsigned char)(data & 0x00FF) == crc) { |
| narshu | 0:b4c2aa657754 | 360 | //If the checksum is correct, add our data to the end of the output buffer |
| narshu | 0:b4c2aa657754 | 361 | while (!temp.empty()) { |
| narshu | 0:b4c2aa657754 | 362 | fifo.push(temp.front()); |
| narshu | 0:b4c2aa657754 | 363 | temp.pop(); |
| narshu | 0:b4c2aa657754 | 364 | } |
| narshu | 0:b4c2aa657754 | 365 | } |
| narshu | 0:b4c2aa657754 | 366 | |
| narshu | 0:b4c2aa657754 | 367 | // Tell RF Module we are finished, and clean up |
| narshu | 0:b4c2aa657754 | 368 | i = -2; |
| narshu | 0:b4c2aa657754 | 369 | packet_length = 0; |
| narshu | 0:b4c2aa657754 | 370 | crc = 0; |
| narshu | 0:b4c2aa657754 | 371 | temp = queue<unsigned char>(); |
| narshu | 0:b4c2aa657754 | 372 | resetRX(); |
| narshu | 0:b4c2aa657754 | 373 | } |
| narshu | 0:b4c2aa657754 | 374 | } |
| narshu | 0:b4c2aa657754 | 375 | } |
| narshu | 0:b4c2aa657754 | 376 | |
| narshu | 0:b4c2aa657754 | 377 | } |
| narshu | 0:b4c2aa657754 | 378 | |
| narshu | 0:b4c2aa657754 | 379 | unsigned int RF12B::status() { |
| narshu | 0:b4c2aa657754 | 380 | return writeCmd(0x0000); |
| narshu | 0:b4c2aa657754 | 381 | } |
| narshu | 0:b4c2aa657754 | 382 | |
| narshu | 0:b4c2aa657754 | 383 | /* Tell the RF Module this packet is received and wait for the next */ |
| narshu | 0:b4c2aa657754 | 384 | void RF12B::resetRX() { |
| narshu | 0:b4c2aa657754 | 385 | writeCmd(0xCA81); |
| narshu | 0:b4c2aa657754 | 386 | writeCmd(0xCA83); |
| narshu | 0:b4c2aa657754 | 387 | }; |
| narshu | 0:b4c2aa657754 | 388 | |
| narshu | 0:b4c2aa657754 | 389 | /* Calculate CRC8 */ |
| narshu | 0:b4c2aa657754 | 390 | unsigned char RF12B::crc8(unsigned char crc, unsigned char data) { |
| narshu | 0:b4c2aa657754 | 391 | crc = crc ^ data; |
| narshu | 0:b4c2aa657754 | 392 | for (int i = 0; i < 8; i++) { |
| narshu | 0:b4c2aa657754 | 393 | if (crc & 0x01) { |
| narshu | 0:b4c2aa657754 | 394 | crc = (crc >> 1) ^ 0x8C; |
| narshu | 0:b4c2aa657754 | 395 | } else { |
| narshu | 0:b4c2aa657754 | 396 | crc >>= 1; |
| narshu | 0:b4c2aa657754 | 397 | } |
| narshu | 0:b4c2aa657754 | 398 | } |
| narshu | 0:b4c2aa657754 | 399 | return crc; |
| narshu | 0:b4c2aa657754 | 400 | } |