Oskar Weigl
This is for ICRS\' second generation Quadcopter
RF12B/RF12B.cpp@0:0bbf2f16da9c, 2011-11-18 (annotated)
- Committer:
- madcowswe
- Date:
- Fri Nov 18 18:23:33 2011 +0000
- Revision:
- 0:0bbf2f16da9c
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| madcowswe | 0:0bbf2f16da9c | 1 | #include "RF12B.h" |
| madcowswe | 0:0bbf2f16da9c | 2 | |
| madcowswe | 0:0bbf2f16da9c | 3 | #include "RF_defs.h" |
| madcowswe | 0:0bbf2f16da9c | 4 | #include <algorithm> |
| madcowswe | 0:0bbf2f16da9c | 5 | |
| madcowswe | 0:0bbf2f16da9c | 6 | RF12B::RF12B(PinName _SDI, |
| madcowswe | 0:0bbf2f16da9c | 7 | PinName _SDO, |
| madcowswe | 0:0bbf2f16da9c | 8 | PinName _SCK, |
| madcowswe | 0:0bbf2f16da9c | 9 | PinName _NCS, |
| madcowswe | 0:0bbf2f16da9c | 10 | PinName _NIRQ):spi(_SDI, _SDO, _SCK), |
| madcowswe | 0:0bbf2f16da9c | 11 | NCS(_NCS), NIRQ(_NIRQ), NIRQ_in(_NIRQ), rfled(LED3) { |
| madcowswe | 0:0bbf2f16da9c | 12 | |
| madcowswe | 0:0bbf2f16da9c | 13 | /* SPI frequency, word lenght, polarity and phase */ |
| madcowswe | 0:0bbf2f16da9c | 14 | spi.format(16,0); |
| madcowswe | 0:0bbf2f16da9c | 15 | spi.frequency(2000000); |
| madcowswe | 0:0bbf2f16da9c | 16 | |
| madcowswe | 0:0bbf2f16da9c | 17 | /* Set ~CS high */ |
| madcowswe | 0:0bbf2f16da9c | 18 | NCS = 1; |
| madcowswe | 0:0bbf2f16da9c | 19 | |
| madcowswe | 0:0bbf2f16da9c | 20 | /* Initialise RF Module */ |
| madcowswe | 0:0bbf2f16da9c | 21 | init(); |
| madcowswe | 0:0bbf2f16da9c | 22 | |
| madcowswe | 0:0bbf2f16da9c | 23 | /* Setup interrupt to happen on falling edge of NIRQ */ |
| madcowswe | 0:0bbf2f16da9c | 24 | NIRQ.fall(this, &RF12B::rxISR); |
| madcowswe | 0:0bbf2f16da9c | 25 | } |
| madcowswe | 0:0bbf2f16da9c | 26 | |
| madcowswe | 0:0bbf2f16da9c | 27 | /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/ |
| madcowswe | 0:0bbf2f16da9c | 28 | unsigned int RF12B::available() { |
| madcowswe | 0:0bbf2f16da9c | 29 | return fifo.size(); |
| madcowswe | 0:0bbf2f16da9c | 30 | } |
| madcowswe | 0:0bbf2f16da9c | 31 | |
| madcowswe | 0:0bbf2f16da9c | 32 | /* Reads a packet of data, with length "size" Returns false if read failed. TODO: make a metafifo to isolate packets*/ |
| madcowswe | 0:0bbf2f16da9c | 33 | bool RF12B::read(unsigned char* data, unsigned int size) { |
| madcowswe | 0:0bbf2f16da9c | 34 | if (fifo.size() == 0) { |
| madcowswe | 0:0bbf2f16da9c | 35 | return false; |
| madcowswe | 0:0bbf2f16da9c | 36 | } else { |
| madcowswe | 0:0bbf2f16da9c | 37 | unsigned int i = 0; |
| madcowswe | 0:0bbf2f16da9c | 38 | while (fifo.size() > 0 && i < size) { |
| madcowswe | 0:0bbf2f16da9c | 39 | data[i++] = fifo.front(); |
| madcowswe | 0:0bbf2f16da9c | 40 | fifo.pop(); |
| madcowswe | 0:0bbf2f16da9c | 41 | } |
| madcowswe | 0:0bbf2f16da9c | 42 | return true; |
| madcowswe | 0:0bbf2f16da9c | 43 | } |
| madcowswe | 0:0bbf2f16da9c | 44 | } |
| madcowswe | 0:0bbf2f16da9c | 45 | |
| madcowswe | 0:0bbf2f16da9c | 46 | /* Reads a byte of data from the receive buffer */ |
| madcowswe | 0:0bbf2f16da9c | 47 | unsigned char RF12B::read() { |
| madcowswe | 0:0bbf2f16da9c | 48 | if (available()) { |
| madcowswe | 0:0bbf2f16da9c | 49 | unsigned char data = fifo.front(); |
| madcowswe | 0:0bbf2f16da9c | 50 | fifo.pop(); |
| madcowswe | 0:0bbf2f16da9c | 51 | return data; |
| madcowswe | 0:0bbf2f16da9c | 52 | } else { |
| madcowswe | 0:0bbf2f16da9c | 53 | return 0xFF; // Error val although could also be data... |
| madcowswe | 0:0bbf2f16da9c | 54 | } |
| madcowswe | 0:0bbf2f16da9c | 55 | } |
| madcowswe | 0:0bbf2f16da9c | 56 | |
| madcowswe | 0:0bbf2f16da9c | 57 | /* Sends a packet of data to the RF module for transmission TODO: Make asych*/ |
| madcowswe | 0:0bbf2f16da9c | 58 | void RF12B::write(unsigned char *data, unsigned char length) { |
| madcowswe | 0:0bbf2f16da9c | 59 | unsigned char crc = 0; |
| madcowswe | 0:0bbf2f16da9c | 60 | |
| madcowswe | 0:0bbf2f16da9c | 61 | /* Transmitter mode */ |
| madcowswe | 0:0bbf2f16da9c | 62 | changeMode(TX); |
| madcowswe | 0:0bbf2f16da9c | 63 | |
| madcowswe | 0:0bbf2f16da9c | 64 | writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 65 | send(0xAA); // PREAMBLE |
| madcowswe | 0:0bbf2f16da9c | 66 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 67 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 68 | send(0x2D); // SYNC |
| madcowswe | 0:0bbf2f16da9c | 69 | send(0xD4); |
| madcowswe | 0:0bbf2f16da9c | 70 | /* Packet Length */ |
| madcowswe | 0:0bbf2f16da9c | 71 | send(length); |
| madcowswe | 0:0bbf2f16da9c | 72 | crc = crc8(crc, length); |
| madcowswe | 0:0bbf2f16da9c | 73 | send(crc); |
| madcowswe | 0:0bbf2f16da9c | 74 | crc = crc8(crc, crc); |
| madcowswe | 0:0bbf2f16da9c | 75 | /* Packet Data */ |
| madcowswe | 0:0bbf2f16da9c | 76 | for (unsigned char i=0; i<length; i++) { |
| madcowswe | 0:0bbf2f16da9c | 77 | send(data[i]); |
| madcowswe | 0:0bbf2f16da9c | 78 | crc = crc8(crc, data[i]); |
| madcowswe | 0:0bbf2f16da9c | 79 | } |
| madcowswe | 0:0bbf2f16da9c | 80 | send(crc); |
| madcowswe | 0:0bbf2f16da9c | 81 | send(0xAA); // DUMMY BYTES |
| madcowswe | 0:0bbf2f16da9c | 82 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 83 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 84 | |
| madcowswe | 0:0bbf2f16da9c | 85 | /* Back to receiver mode */ |
| madcowswe | 0:0bbf2f16da9c | 86 | changeMode(RX); |
| madcowswe | 0:0bbf2f16da9c | 87 | status(); |
| madcowswe | 0:0bbf2f16da9c | 88 | } |
| madcowswe | 0:0bbf2f16da9c | 89 | |
| madcowswe | 0:0bbf2f16da9c | 90 | /* Transmit a 1-byte data packet */ |
| madcowswe | 0:0bbf2f16da9c | 91 | void RF12B::write(unsigned char data) { |
| madcowswe | 0:0bbf2f16da9c | 92 | write(&data, 1); |
| madcowswe | 0:0bbf2f16da9c | 93 | } |
| madcowswe | 0:0bbf2f16da9c | 94 | |
| madcowswe | 0:0bbf2f16da9c | 95 | void RF12B::write(queue<char> &data, int length) { |
| madcowswe | 0:0bbf2f16da9c | 96 | char crc = 0; |
| madcowswe | 0:0bbf2f16da9c | 97 | char length_byte = 0; |
| madcowswe | 0:0bbf2f16da9c | 98 | |
| madcowswe | 0:0bbf2f16da9c | 99 | /* -1 means try to transmit everything in the queue */ |
| madcowswe | 0:0bbf2f16da9c | 100 | if(length == -1) { |
| madcowswe | 0:0bbf2f16da9c | 101 | length = data.size(); |
| madcowswe | 0:0bbf2f16da9c | 102 | } |
| madcowswe | 0:0bbf2f16da9c | 103 | |
| madcowswe | 0:0bbf2f16da9c | 104 | /* max length of packet is 255 */ |
| madcowswe | 0:0bbf2f16da9c | 105 | length_byte = min(length, 255); |
| madcowswe | 0:0bbf2f16da9c | 106 | |
| madcowswe | 0:0bbf2f16da9c | 107 | /* Transmitter mode */ |
| madcowswe | 0:0bbf2f16da9c | 108 | changeMode(TX); |
| madcowswe | 0:0bbf2f16da9c | 109 | |
| madcowswe | 0:0bbf2f16da9c | 110 | writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 111 | send(0xAA); // PREAMBLE |
| madcowswe | 0:0bbf2f16da9c | 112 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 113 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 114 | send(0x2D); // SYNC |
| madcowswe | 0:0bbf2f16da9c | 115 | send(0xD4); |
| madcowswe | 0:0bbf2f16da9c | 116 | /* Packet Length */ |
| madcowswe | 0:0bbf2f16da9c | 117 | send(length_byte); |
| madcowswe | 0:0bbf2f16da9c | 118 | crc = crc8(crc, length_byte); |
| madcowswe | 0:0bbf2f16da9c | 119 | send(crc); |
| madcowswe | 0:0bbf2f16da9c | 120 | crc = crc8(crc, crc); |
| madcowswe | 0:0bbf2f16da9c | 121 | /* Packet Data */ |
| madcowswe | 0:0bbf2f16da9c | 122 | for (char i=0; i<length_byte; i++) { |
| madcowswe | 0:0bbf2f16da9c | 123 | send(data.front()); |
| madcowswe | 0:0bbf2f16da9c | 124 | crc = crc8(crc, data.front()); |
| madcowswe | 0:0bbf2f16da9c | 125 | data.pop(); |
| madcowswe | 0:0bbf2f16da9c | 126 | } |
| madcowswe | 0:0bbf2f16da9c | 127 | send(crc); |
| madcowswe | 0:0bbf2f16da9c | 128 | send(0xAA); // DUMMY BYTES |
| madcowswe | 0:0bbf2f16da9c | 129 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 130 | send(0xAA); |
| madcowswe | 0:0bbf2f16da9c | 131 | |
| madcowswe | 0:0bbf2f16da9c | 132 | /* Back to receiver mode */ |
| madcowswe | 0:0bbf2f16da9c | 133 | changeMode(RX); |
| madcowswe | 0:0bbf2f16da9c | 134 | status(); |
| madcowswe | 0:0bbf2f16da9c | 135 | } |
| madcowswe | 0:0bbf2f16da9c | 136 | |
| madcowswe | 0:0bbf2f16da9c | 137 | /********************************************************************** |
| madcowswe | 0:0bbf2f16da9c | 138 | * PRIVATE FUNCTIONS |
| madcowswe | 0:0bbf2f16da9c | 139 | *********************************************************************/ |
| madcowswe | 0:0bbf2f16da9c | 140 | |
| madcowswe | 0:0bbf2f16da9c | 141 | /* Initialises the RF12B module */ |
| madcowswe | 0:0bbf2f16da9c | 142 | void RF12B::init() { |
| madcowswe | 0:0bbf2f16da9c | 143 | /* writeCmd(0x80E7); //EL,EF,868band,12.0pF |
| madcowswe | 0:0bbf2f16da9c | 144 | changeMode(RX); |
| madcowswe | 0:0bbf2f16da9c | 145 | writeCmd(0xA640); //frequency select |
| madcowswe | 0:0bbf2f16da9c | 146 | writeCmd(0xC647); //4.8kbps |
| madcowswe | 0:0bbf2f16da9c | 147 | writeCmd(0x94A0); //VDI,FAST,134kHz,0dBm,-103dBm |
| madcowswe | 0:0bbf2f16da9c | 148 | writeCmd(0xC2AC); //AL,!ml,DIG,DQD4 |
| madcowswe | 0:0bbf2f16da9c | 149 | writeCmd(0xCA81); //FIFO8,SYNC,!ff,DR |
| madcowswe | 0:0bbf2f16da9c | 150 | writeCmd(0xCED4); //SYNC=2DD4 |
| madcowswe | 0:0bbf2f16da9c | 151 | writeCmd(0xC483); //@PWR,NO RSTRIC,!st,!fi,OE,EN |
| madcowswe | 0:0bbf2f16da9c | 152 | writeCmd(0x9850); //!mp,90kHz,MAX OUT |
| madcowswe | 0:0bbf2f16da9c | 153 | writeCmd(0xCC17); //OB1, COB0, LPX, Iddy, CDDIT�CBW0 |
| madcowswe | 0:0bbf2f16da9c | 154 | writeCmd(0xE000); //NOT USED |
| madcowswe | 0:0bbf2f16da9c | 155 | writeCmd(0xC800); //NOT USED |
| madcowswe | 0:0bbf2f16da9c | 156 | writeCmd(0xC040); //1.66MHz,2.2V */ |
| madcowswe | 0:0bbf2f16da9c | 157 | |
| madcowswe | 0:0bbf2f16da9c | 158 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 159 | RFM_CONFIG_EL | |
| madcowswe | 0:0bbf2f16da9c | 160 | RFM_CONFIG_EF | |
| madcowswe | 0:0bbf2f16da9c | 161 | RFM_CONFIG_BAND_433 //| |
| madcowswe | 0:0bbf2f16da9c | 162 | //RFM_CONFIG_X_11_0pf // meh, using default |
| madcowswe | 0:0bbf2f16da9c | 163 | ); |
| madcowswe | 0:0bbf2f16da9c | 164 | |
| madcowswe | 0:0bbf2f16da9c | 165 | // 2. Power Management Command |
| madcowswe | 0:0bbf2f16da9c | 166 | // leave everything switched off for now |
| madcowswe | 0:0bbf2f16da9c | 167 | /* |
| madcowswe | 0:0bbf2f16da9c | 168 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 169 | RFM_POWER_MANAGEMENT // switch all off |
| madcowswe | 0:0bbf2f16da9c | 170 | ); |
| madcowswe | 0:0bbf2f16da9c | 171 | */ |
| madcowswe | 0:0bbf2f16da9c | 172 | |
| madcowswe | 0:0bbf2f16da9c | 173 | // 3. Frequency Setting Command |
| madcowswe | 0:0bbf2f16da9c | 174 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 175 | RFM_FREQUENCY | |
| madcowswe | 0:0bbf2f16da9c | 176 | RFM_FREQ_433Band(435.7) //I totally made this value up... if someone knows where the sweetspots are in this band, tell me! |
| madcowswe | 0:0bbf2f16da9c | 177 | ); |
| madcowswe | 0:0bbf2f16da9c | 178 | |
| madcowswe | 0:0bbf2f16da9c | 179 | |
| madcowswe | 0:0bbf2f16da9c | 180 | // 4. Data Rate Command |
| madcowswe | 0:0bbf2f16da9c | 181 | writeCmd(RFM_DATA_RATE_9600); |
| madcowswe | 0:0bbf2f16da9c | 182 | |
| madcowswe | 0:0bbf2f16da9c | 183 | |
| madcowswe | 0:0bbf2f16da9c | 184 | // 5. Receiver Control Command |
| madcowswe | 0:0bbf2f16da9c | 185 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 186 | RFM_RX_CONTROL_P20_VDI | |
| madcowswe | 0:0bbf2f16da9c | 187 | RFM_RX_CONTROL_VDI_FAST | |
| madcowswe | 0:0bbf2f16da9c | 188 | //RFM_RX_CONTROL_BW(RFM_BAUD_RATE) | |
| madcowswe | 0:0bbf2f16da9c | 189 | RFM_RX_CONTROL_BW_134 | // CHANGE THIS TO 67 TO IMPROVE RANGE! (though the bitrate must then be below 8kbaud, and fsk modulation changed) |
| madcowswe | 0:0bbf2f16da9c | 190 | RFM_RX_CONTROL_GAIN_0 | |
| madcowswe | 0:0bbf2f16da9c | 191 | RFM_RX_CONTROL_RSSI_103 // Might need adjustment. Datasheet says around 10^-5 bit error rate at this level and baudrate. |
| madcowswe | 0:0bbf2f16da9c | 192 | ); |
| madcowswe | 0:0bbf2f16da9c | 193 | |
| madcowswe | 0:0bbf2f16da9c | 194 | // 6. Data Filter Command |
| madcowswe | 0:0bbf2f16da9c | 195 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 196 | RFM_DATA_FILTER_AL | |
| madcowswe | 0:0bbf2f16da9c | 197 | RFM_DATA_FILTER_ML | |
| madcowswe | 0:0bbf2f16da9c | 198 | RFM_DATA_FILTER_DIG //| |
| madcowswe | 0:0bbf2f16da9c | 199 | //RFM_DATA_FILTER_DQD(4) |
| madcowswe | 0:0bbf2f16da9c | 200 | ); |
| madcowswe | 0:0bbf2f16da9c | 201 | |
| madcowswe | 0:0bbf2f16da9c | 202 | // 7. FIFO and Reset Mode Command |
| madcowswe | 0:0bbf2f16da9c | 203 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 204 | RFM_FIFO_IT(8) | |
| madcowswe | 0:0bbf2f16da9c | 205 | RFM_FIFO_DR | |
| madcowswe | 0:0bbf2f16da9c | 206 | 0x8 //turn on 16bit sync word |
| madcowswe | 0:0bbf2f16da9c | 207 | ); |
| madcowswe | 0:0bbf2f16da9c | 208 | |
| madcowswe | 0:0bbf2f16da9c | 209 | // 8. FIFO Syncword |
| madcowswe | 0:0bbf2f16da9c | 210 | // Leave as default: 0xD4 |
| madcowswe | 0:0bbf2f16da9c | 211 | |
| madcowswe | 0:0bbf2f16da9c | 212 | // 9. Receiver FIFO Read |
| madcowswe | 0:0bbf2f16da9c | 213 | // when the interupt goes high, (and if we can assume that it was a fifo fill interrupt) we can read a byte using: |
| madcowswe | 0:0bbf2f16da9c | 214 | // result = RFM_READ_FIFO(); |
| madcowswe | 0:0bbf2f16da9c | 215 | |
| madcowswe | 0:0bbf2f16da9c | 216 | // 10. AFC Command |
| madcowswe | 0:0bbf2f16da9c | 217 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 218 | //RFM_AFC_AUTO_VDI | //Note this might be changed to improve range. Refer to datasheet. |
| madcowswe | 0:0bbf2f16da9c | 219 | RFM_AFC_AUTO_INDEPENDENT | |
| madcowswe | 0:0bbf2f16da9c | 220 | RFM_AFC_RANGE_LIMIT_7_8 | |
| madcowswe | 0:0bbf2f16da9c | 221 | RFM_AFC_EN | |
| madcowswe | 0:0bbf2f16da9c | 222 | RFM_AFC_OE | |
| madcowswe | 0:0bbf2f16da9c | 223 | RFM_AFC_FI |
| madcowswe | 0:0bbf2f16da9c | 224 | ); |
| madcowswe | 0:0bbf2f16da9c | 225 | |
| madcowswe | 0:0bbf2f16da9c | 226 | // 11. TX Configuration Control Command |
| madcowswe | 0:0bbf2f16da9c | 227 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 228 | RFM_TX_CONTROL_MOD_60 | |
| madcowswe | 0:0bbf2f16da9c | 229 | RFM_TX_CONTROL_POW_0 |
| madcowswe | 0:0bbf2f16da9c | 230 | ); |
| madcowswe | 0:0bbf2f16da9c | 231 | |
| madcowswe | 0:0bbf2f16da9c | 232 | |
| madcowswe | 0:0bbf2f16da9c | 233 | // 12. PLL Setting Command |
| madcowswe | 0:0bbf2f16da9c | 234 | writeCmd( |
| madcowswe | 0:0bbf2f16da9c | 235 | 0xCC77 & ~0x01 // Setting the PLL bandwith, less noise, but max bitrate capped at 86.2 |
| madcowswe | 0:0bbf2f16da9c | 236 | // I think this will slow down the pll's reaction time. Not sure, check with someone! |
| madcowswe | 0:0bbf2f16da9c | 237 | ); |
| madcowswe | 0:0bbf2f16da9c | 238 | |
| madcowswe | 0:0bbf2f16da9c | 239 | changeMode(RX); |
| madcowswe | 0:0bbf2f16da9c | 240 | resetRX(); |
| madcowswe | 0:0bbf2f16da9c | 241 | status(); |
| madcowswe | 0:0bbf2f16da9c | 242 | } |
| madcowswe | 0:0bbf2f16da9c | 243 | |
| madcowswe | 0:0bbf2f16da9c | 244 | /* Write a command to the RF Module */ |
| madcowswe | 0:0bbf2f16da9c | 245 | unsigned int RF12B::writeCmd(unsigned int cmd) { |
| madcowswe | 0:0bbf2f16da9c | 246 | NCS = 0; |
| madcowswe | 0:0bbf2f16da9c | 247 | unsigned int recv = spi.write(cmd); |
| madcowswe | 0:0bbf2f16da9c | 248 | NCS = 1; |
| madcowswe | 0:0bbf2f16da9c | 249 | return recv; |
| madcowswe | 0:0bbf2f16da9c | 250 | } |
| madcowswe | 0:0bbf2f16da9c | 251 | |
| madcowswe | 0:0bbf2f16da9c | 252 | /* Sends a byte of data across RF */ |
| madcowswe | 0:0bbf2f16da9c | 253 | void RF12B::send(unsigned char data) { |
| madcowswe | 0:0bbf2f16da9c | 254 | while (NIRQ); |
| madcowswe | 0:0bbf2f16da9c | 255 | writeCmd(0xB800 + data); |
| madcowswe | 0:0bbf2f16da9c | 256 | } |
| madcowswe | 0:0bbf2f16da9c | 257 | |
| madcowswe | 0:0bbf2f16da9c | 258 | /* Change the mode of the RF module to Transmitting or Receiving */ |
| madcowswe | 0:0bbf2f16da9c | 259 | void RF12B::changeMode(rfmode_t _mode) { |
| madcowswe | 0:0bbf2f16da9c | 260 | mode = _mode; |
| madcowswe | 0:0bbf2f16da9c | 261 | if (_mode == TX) { |
| madcowswe | 0:0bbf2f16da9c | 262 | writeCmd(0x8239); //!er,!ebb,ET,ES,EX,!eb,!ew,DC |
| madcowswe | 0:0bbf2f16da9c | 263 | } else { /* mode == RX */ |
| madcowswe | 0:0bbf2f16da9c | 264 | writeCmd(0x8299); //er,!ebb,ET,ES,EX,!eb,!ew,DC |
| madcowswe | 0:0bbf2f16da9c | 265 | } |
| madcowswe | 0:0bbf2f16da9c | 266 | } |
| madcowswe | 0:0bbf2f16da9c | 267 | |
| madcowswe | 0:0bbf2f16da9c | 268 | /* Interrupt routine for data reception */ |
| madcowswe | 0:0bbf2f16da9c | 269 | void RF12B::rxISR() { |
| madcowswe | 0:0bbf2f16da9c | 270 | unsigned int data = 0; |
| madcowswe | 0:0bbf2f16da9c | 271 | static int i = -2; |
| madcowswe | 0:0bbf2f16da9c | 272 | static unsigned char packet_length = 0; |
| madcowswe | 0:0bbf2f16da9c | 273 | static unsigned char crc = 0; |
| madcowswe | 0:0bbf2f16da9c | 274 | static queue<unsigned char> temp; |
| madcowswe | 0:0bbf2f16da9c | 275 | |
| madcowswe | 0:0bbf2f16da9c | 276 | //Loop while interrupt is asserted |
| madcowswe | 0:0bbf2f16da9c | 277 | while (!NIRQ_in && mode == RX) { |
| madcowswe | 0:0bbf2f16da9c | 278 | |
| madcowswe | 0:0bbf2f16da9c | 279 | /* Grab the packet's length byte */ |
| madcowswe | 0:0bbf2f16da9c | 280 | if (i == -2) { |
| madcowswe | 0:0bbf2f16da9c | 281 | data = writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 282 | if ( (data&0x8000) ) { |
| madcowswe | 0:0bbf2f16da9c | 283 | data = writeCmd(0xB000); |
| madcowswe | 0:0bbf2f16da9c | 284 | packet_length = (data&0x00FF); |
| madcowswe | 0:0bbf2f16da9c | 285 | crc = crc8(crc, packet_length); |
| madcowswe | 0:0bbf2f16da9c | 286 | i++; |
| madcowswe | 0:0bbf2f16da9c | 287 | } |
| madcowswe | 0:0bbf2f16da9c | 288 | } |
| madcowswe | 0:0bbf2f16da9c | 289 | |
| madcowswe | 0:0bbf2f16da9c | 290 | //If we exhaust the interrupt, exit |
| madcowswe | 0:0bbf2f16da9c | 291 | if (NIRQ_in) |
| madcowswe | 0:0bbf2f16da9c | 292 | break; |
| madcowswe | 0:0bbf2f16da9c | 293 | |
| madcowswe | 0:0bbf2f16da9c | 294 | // Check that packet length was correct |
| madcowswe | 0:0bbf2f16da9c | 295 | if (i == -1) { |
| madcowswe | 0:0bbf2f16da9c | 296 | data = writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 297 | if ( (data&0x8000) ) { |
| madcowswe | 0:0bbf2f16da9c | 298 | data = writeCmd(0xB000); |
| madcowswe | 0:0bbf2f16da9c | 299 | unsigned char crcofsize = (data&0x00FF); |
| madcowswe | 0:0bbf2f16da9c | 300 | if (crcofsize != crc) { |
| madcowswe | 0:0bbf2f16da9c | 301 | //It was wrong, start over |
| madcowswe | 0:0bbf2f16da9c | 302 | i = -2; |
| madcowswe | 0:0bbf2f16da9c | 303 | packet_length = 0; |
| madcowswe | 0:0bbf2f16da9c | 304 | crc = 0; |
| madcowswe | 0:0bbf2f16da9c | 305 | temp = queue<unsigned char>(); |
| madcowswe | 0:0bbf2f16da9c | 306 | resetRX(); |
| madcowswe | 0:0bbf2f16da9c | 307 | } else { |
| madcowswe | 0:0bbf2f16da9c | 308 | crc = crc8(crc, crcofsize); |
| madcowswe | 0:0bbf2f16da9c | 309 | i++; |
| madcowswe | 0:0bbf2f16da9c | 310 | } |
| madcowswe | 0:0bbf2f16da9c | 311 | } |
| madcowswe | 0:0bbf2f16da9c | 312 | } |
| madcowswe | 0:0bbf2f16da9c | 313 | |
| madcowswe | 0:0bbf2f16da9c | 314 | //If we exhaust the interrupt, exit |
| madcowswe | 0:0bbf2f16da9c | 315 | if (NIRQ_in) |
| madcowswe | 0:0bbf2f16da9c | 316 | break; |
| madcowswe | 0:0bbf2f16da9c | 317 | |
| madcowswe | 0:0bbf2f16da9c | 318 | /* Grab the packet's data */ |
| madcowswe | 0:0bbf2f16da9c | 319 | if (i >= 0 && i < packet_length) { |
| madcowswe | 0:0bbf2f16da9c | 320 | data = writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 321 | if ( (data&0x8000) ) { |
| madcowswe | 0:0bbf2f16da9c | 322 | data = writeCmd(0xB000); |
| madcowswe | 0:0bbf2f16da9c | 323 | temp.push(data&0x00FF); |
| madcowswe | 0:0bbf2f16da9c | 324 | crc = crc8(crc, (unsigned char)(data&0x00FF)); |
| madcowswe | 0:0bbf2f16da9c | 325 | i++; |
| madcowswe | 0:0bbf2f16da9c | 326 | } |
| madcowswe | 0:0bbf2f16da9c | 327 | } |
| madcowswe | 0:0bbf2f16da9c | 328 | |
| madcowswe | 0:0bbf2f16da9c | 329 | //If we exhaust the interrupt, exit |
| madcowswe | 0:0bbf2f16da9c | 330 | if (NIRQ_in) |
| madcowswe | 0:0bbf2f16da9c | 331 | break; |
| madcowswe | 0:0bbf2f16da9c | 332 | |
| madcowswe | 0:0bbf2f16da9c | 333 | if (i >= packet_length) { |
| madcowswe | 0:0bbf2f16da9c | 334 | data = writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 335 | if ( (data&0x8000) ) { |
| madcowswe | 0:0bbf2f16da9c | 336 | data = writeCmd(0xB000); |
| madcowswe | 0:0bbf2f16da9c | 337 | if ((unsigned char)(data & 0x00FF) == crc) { |
| madcowswe | 0:0bbf2f16da9c | 338 | //If the checksum is correct, add our data to the end of the output buffer |
| madcowswe | 0:0bbf2f16da9c | 339 | while (!temp.empty()) { |
| madcowswe | 0:0bbf2f16da9c | 340 | fifo.push(temp.front()); |
| madcowswe | 0:0bbf2f16da9c | 341 | temp.pop(); |
| madcowswe | 0:0bbf2f16da9c | 342 | } |
| madcowswe | 0:0bbf2f16da9c | 343 | } |
| madcowswe | 0:0bbf2f16da9c | 344 | |
| madcowswe | 0:0bbf2f16da9c | 345 | /* Tell RF Module we are finished, and clean up */ |
| madcowswe | 0:0bbf2f16da9c | 346 | i = -2; |
| madcowswe | 0:0bbf2f16da9c | 347 | packet_length = 0; |
| madcowswe | 0:0bbf2f16da9c | 348 | crc = 0; |
| madcowswe | 0:0bbf2f16da9c | 349 | temp = queue<unsigned char>(); |
| madcowswe | 0:0bbf2f16da9c | 350 | resetRX(); |
| madcowswe | 0:0bbf2f16da9c | 351 | } |
| madcowswe | 0:0bbf2f16da9c | 352 | } |
| madcowswe | 0:0bbf2f16da9c | 353 | } |
| madcowswe | 0:0bbf2f16da9c | 354 | } |
| madcowswe | 0:0bbf2f16da9c | 355 | |
| madcowswe | 0:0bbf2f16da9c | 356 | unsigned int RF12B::status() { |
| madcowswe | 0:0bbf2f16da9c | 357 | return writeCmd(0x0000); |
| madcowswe | 0:0bbf2f16da9c | 358 | } |
| madcowswe | 0:0bbf2f16da9c | 359 | |
| madcowswe | 0:0bbf2f16da9c | 360 | /* Tell the RF Module this packet is received and wait for the next */ |
| madcowswe | 0:0bbf2f16da9c | 361 | void RF12B::resetRX() { |
| madcowswe | 0:0bbf2f16da9c | 362 | writeCmd(0xCA81); |
| madcowswe | 0:0bbf2f16da9c | 363 | writeCmd(0xCA83); |
| madcowswe | 0:0bbf2f16da9c | 364 | }; |
| madcowswe | 0:0bbf2f16da9c | 365 | |
| madcowswe | 0:0bbf2f16da9c | 366 | /* Calculate CRC8 */ |
| madcowswe | 0:0bbf2f16da9c | 367 | unsigned char RF12B::crc8(unsigned char crc, unsigned char data) { |
| madcowswe | 0:0bbf2f16da9c | 368 | crc = crc ^ data; |
| madcowswe | 0:0bbf2f16da9c | 369 | for (int i = 0; i < 8; i++) { |
| madcowswe | 0:0bbf2f16da9c | 370 | if (crc & 0x01) { |
| madcowswe | 0:0bbf2f16da9c | 371 | crc = (crc >> 1) ^ 0x8C; |
| madcowswe | 0:0bbf2f16da9c | 372 | } else { |
| madcowswe | 0:0bbf2f16da9c | 373 | crc >>= 1; |
| madcowswe | 0:0bbf2f16da9c | 374 | } |
| madcowswe | 0:0bbf2f16da9c | 375 | } |
| madcowswe | 0:0bbf2f16da9c | 376 | return crc; |
| madcowswe | 0:0bbf2f16da9c | 377 | } |