![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
rfm22 receive code for BAE
main.cpp
- Committer:
- shekhar
- Date:
- 2014-12-26
- Revision:
- 0:7031cc82d88a
- Child:
- 1:0aa0c0b64f0c
File content as of revision 0:7031cc82d88a:
#include "beacon.h" Serial pc(USBTX, USBRX); // tx, rx SPI spi(D11, D12, D13); // mosi, miso, sclk DigitalOut cs(D10); //slave select or chip select void writereg(uint8_t reg,uint8_t val) { cs = 0;__disable_irq();spi.write(reg | 0x80);spi.write(val);__enable_irq();cs = 1; } uint8_t readreg(uint8_t reg) { int val;cs = 0;__disable_irq();spi.write(reg & ~0x80);val = spi.write(0);__enable_irq();cs = 1;return val; } void clearTxBuf() { writereg(RF22_REG_08_OPERATING_MODE2,0x01); writereg(RF22_REG_08_OPERATING_MODE2,0x00); } void clearRxBuf() { writereg(RF22_REG_08_OPERATING_MODE2,0x02); writereg(RF22_REG_08_OPERATING_MODE2,0x00); } int setFrequency(float centre,float afcPullInRange) { //freq setting begins uint8_t fbsel = 0x40; uint8_t afclimiter; if (centre >= 480.0) { centre /= 2; fbsel |= 0x20; afclimiter = afcPullInRange * 1000000.0 / 1250.0; } else { if (afcPullInRange < 0.0 || afcPullInRange > 0.159375) return false; afclimiter = afcPullInRange * 1000000.0 / 625.0; } centre /= 10.0; float integerPart = floor(centre); float fractionalPart = centre - integerPart; uint8_t fb = (uint8_t)integerPart - 24; // Range 0 to 23 fbsel |= fb; uint16_t fc = fractionalPart * 64000; writereg(RF22_REG_73_FREQUENCY_OFFSET1, 0); // REVISIT writereg(RF22_REG_74_FREQUENCY_OFFSET2, 0); writereg(RF22_REG_75_FREQUENCY_BAND_SELECT, fbsel); writereg(RF22_REG_76_NOMINAL_CARRIER_FREQUENCY1, fc >> 8); writereg(RF22_REG_77_NOMINAL_CARRIER_FREQUENCY0, fc & 0xff); writereg(RF22_REG_2A_AFC_LIMITER, afclimiter); return 0; } void init() { //reset() writereg(RF22_REG_07_OPERATING_MODE1,0x80); //sw_reset wait(1); //takes time to reset clearTxBuf(); clearRxBuf(); //txfifoalmostempty writereg(RF22_REG_7D_TX_FIFO_CONTROL2,10); //rxfifoalmostfull writereg(RF22_REG_7E_RX_FIFO_CONTROL,20); //Packet-engine registers writereg(RF22_REG_30_DATA_ACCESS_CONTROL,0x8E); //RF22_REG_30_DATA_ACCESS_CONTROL, RF22_ENPACRX | RF22_ENPACTX | RF22_ENCRC | RF22_CRC_CRC_16_IBM //&0x77 = diasable packet rx-tx handling writereg(RF22_REG_32_HEADER_CONTROL1,0x88); //RF22_REG_32_HEADER_CONTROL1, RF22_BCEN_HEADER3 | RF22_HDCH_HEADER3 writereg(RF22_REG_33_HEADER_CONTROL2,0x42); //RF22_REG_33_HEADER_CONTROL2, RF22_HDLEN_4 | RF22_SYNCLEN_2 writereg(RF22_REG_34_PREAMBLE_LENGTH,8); //RF22_REG_34_PREAMBLE_LENGTH, nibbles); preamble length = 8; writereg(RF22_REG_36_SYNC_WORD3,0x2D); //syncword3=2D writereg(RF22_REG_37_SYNC_WORD2,0xD4); //syncword2=D4 writereg(RF22_REG_3F_CHECK_HEADER3,0); //RF22_REG_3F_CHECK_HEADER3, RF22_DEFAULT_NODE_ADDRESS writereg(RF22_REG_3A_TRANSMIT_HEADER3,0xab); //header_to writereg(RF22_REG_3B_TRANSMIT_HEADER2,0xbc); //header_from writereg(RF22_REG_3C_TRANSMIT_HEADER1,0xcd); //header_ids writereg(RF22_REG_3D_TRANSMIT_HEADER0,0xde); //header_flags writereg(RF22_REG_3F_CHECK_HEADER3,0xab); writereg(RF22_REG_40_CHECK_HEADER2,0xbc); writereg(RF22_REG_41_CHECK_HEADER1,0xcd); writereg(RF22_REG_42_CHECK_HEADER0,0xde); //RSSI threshold for clear channel indicator writereg(RF22_REG_27_RSSI_THRESHOLD,0xA5); //55 for -80dBm, 2D for -100dBm, 7D for -60dBm, A5 for -40dBm, CD for -20 dBm writereg(RF22_REG_0B_GPIO_CONFIGURATION0,0x15); // TX state ?? writereg(RF22_REG_0C_GPIO_CONFIGURATION1,0x12); // RX state ?? //interrupts // spiWrite(RF22_REG_05_INTERRUPT_ENABLE1, RF22_ENTXFFAEM |RF22_ENRXFFAFULL | RF22_ENPKSENT |RF22_ENPKVALID| RF22_ENCRCERROR); // spiWrite(RF22_REG_06_INTERRUPT_ENABLE2, RF22_ENPREAVAL); setFrequency(435.0, 0.05); //return !(statusRead() & RF22_FREQERR); if((readreg(RF22_REG_02_DEVICE_STATUS)& 0x08)!= 0x00) pc.printf("frequency not set properly\n"); //frequency set //setModemConfig(FSK_Rb2_4Fd36); FSK_Rb2_4Fd36, ///< FSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz //setmodemregisters //0x1b, 0x03, 0x41, 0x60, 0x27, 0x52, 0x00, 0x07, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x22, 0x3a = FSK_RB2_4FD36 //0xc8, 0x03, 0x39, 0x20, 0x68, 0xdc, 0x00, 0x6b, 0x2a, 0x08, 0x2a, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x21, 0x08 = OOK,2.4, 335 writereg(RF22_REG_1C_IF_FILTER_BANDWIDTH,0x2B); writereg(RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE,0x03); writereg(RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE,0x41); writereg(RF22_REG_21_CLOCK_RECOVERY_OFFSET2,0x60); writereg(RF22_REG_22_CLOCK_RECOVERY_OFFSET1,0x27); //updated 20 to 25 reg values from excel sheet for 1.2 Khz freq. deviation,fsk writereg(RF22_REG_23_CLOCK_RECOVERY_OFFSET0,0x52); writereg(RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1,0x00); writereg(RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0,0x51); /*writereg(RF22_REG_2C_OOK_COUNTER_VALUE_1,0x2a); writereg(RF22_REG_2D_OOK_COUNTER_VALUE_2,0x08);*/ //not required for fsk (OOK counter value) writereg(RF22_REG_2E_SLICER_PEAK_HOLD,0x1e); //?? writereg(RF22_REG_58,0x80); writereg(RF22_REG_69_AGC_OVERRIDE1,0x60); writereg(RF22_REG_6E_TX_DATA_RATE1,0x09); writereg(RF22_REG_6F_TX_DATA_RATE0,0xd5); writereg(RF22_REG_70_MODULATION_CONTROL1,0x2c); writereg(RF22_REG_71_MODULATION_CONTROL2,0x22);//ook = 0x21 //fsk = 0x22 writereg(RF22_REG_72_FREQUENCY_DEVIATION,0x02); //set tx power writereg(RF22_REG_6D_TX_POWER,0x07); //20dbm writereg(RF22_REG_3E_PACKET_LENGTH,RX_DATA); //packet length } int main() { wait(1); // wait for POR to complete //change the timing later cs=1; // chip must be deselected wait(1); //change the time later spi.format(8,0); spi.frequency(10000000); //10MHz SCLK if (readreg(RF22_REG_00_DEVICE_TYPE) == 0x08) pc.printf("spi connection valid\n"); else pc.printf("error in spi connection\n"); init(); //init complete pc.printf("init complete.....press r to receive\n"); //******** while(1)//pc.getc()=='r') { uint8_t data[255]; // for filling the received data int u=0,i=0; int bar = TIMES; //rf22.waitAvailable(); clearTxBuf(); clearRxBuf(); //setModeRx(); writereg(RF22_REG_07_OPERATING_MODE1,0x04);//rxon while((readreg(RF22_REG_04_INTERRUPT_STATUS2)& 0x10) != 0x10) pc.printf("rssi?\n"); //preamble?? while(!(readreg(0x04)&0x40)) pc.printf("detecting preamble\n"); //checking syncword while(!(readreg(RF22_REG_04_INTERRUPT_STATUS2)& 0x80)) pc.printf("sync?\n"); //check for fifothreshold //while((readreg(0x03)& 0x10) != 0x10) // pc.printf("fifo1?\n"); while(u != RX_DATA)//fifo_thresh { pc.printf("1 \n"); if((RX_DATA - u) > TIMES) { //check for fifo_thresh while((readreg(RF22_REG_03_INTERRUPT_STATUS1)& 0x10) != 0x10) pc.printf("fifo2?\n"); bar = TIMES; //reading cs = 0; spi.write(0x7F); for(i=0; i<bar;i++){ data[u+i] = spi.write(0); //pc.printf("0x%X \n",data[u+i]); } u=u+i; pc.printf("u= %d \n",u); cs = 1; } else { pc.printf("2\n"); wait(0.15); bar = RX_DATA - u; //reading cs = 0; spi.write(0x7F); for(i=0; i<bar;i++){ data[u+i] = spi.write(0); //pc.printf("0x%X \n",data[u+i]); } u=u+i; cs = 1; pc.printf("u= %d \n",u); } } //packet valid?? while(!(readreg(RF22_REG_03_INTERRUPT_STATUS1)& 0x02)) pc.printf("checking if packet is valid\n"); //while(1) // pc.printf("0x%X 0x%X *** ",readreg(0x03),readreg(0x04)); pc.printf("packet valid\n"); //4Breceived packet length //while(0x) /*//Printing data for(int i=0; i<RX_DATA; i++) pc.printf("0x%X \n",data[i]); //for(int i = 0; i<12; i++) // pc.printf("%c ",data[i]); //while(!(readreg(0x04)&0x40)) //pc.printf("detecting preamble\n"); */ pc.printf("Received data:\n"); //for(int i=0;i<240;i++) pc.printf("0x%X",hk[i]); // converting uint_8 to bool bool shortbeacon[120]; for(int i = 0; i<120; i++) data[2*i] == 0xFF ? shortbeacon[i] = 1 :shortbeacon[i] = 0; /*for(int i = 0; i<120 ; i++) pc.printf(" %d \n",shortbeacon[i]);*/ //converting bool to uint_8 uint8_t s_beacon[15]; for(int i = 0, m =0 ; i < 15 ; i++ ) for(int n = 0; n < 8; n++,m++) { if(shortbeacon[m]) { s_beacon[i]<<=1; s_beacon[i] |= 0x01; } else s_beacon[i] <<= 1; } pc.printf("Call Sign : "); for(int i = 0; i<7 ; i++) pc.printf(" %X ",s_beacon[i]); pc.printf("\n\nVoltage[0] : "); pc.printf(" 0x%X \n\n",s_beacon[7]); pc.printf("AngularSpeed[0] : "); pc.printf(" 0x%X \n\n",s_beacon[8]); pc.printf("AngularSpeed[1] : "); pc.printf(" 0x%X \n\n",s_beacon[9]); pc.printf("SubsystemStatus[0] : "); pc.printf(" 0x%X \n\n",s_beacon[10]); pc.printf("Temp[0] : "); pc.printf(" 0x%X \n\n",s_beacon[11]); pc.printf("Temp[1] : "); pc.printf(" 0x%X \n\n",s_beacon[12]); pc.printf("Temp[2] : "); pc.printf(" 0x%X \n\n",s_beacon[13]); pc.printf("ErrorFlag[0] : "); pc.printf(" 0x%X \n\n",s_beacon[14]); pc.printf("received headers : \n"); pc.printf("header1 = 0x%X , header2 = 0x%X , header3 = 0x%X , header4 = 0x%X \n",readreg(0x47),readreg(0x48),readreg(0x49),readreg(0x4A)); } }