pradeep shekhar
rfm22 receive code for BAE
Diff: main.cpp
- Revision:
- 0:7031cc82d88a
- Child:
- 1:0aa0c0b64f0c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Dec 26 10:34:54 2014 +0000
@@ -0,0 +1,275 @@
+#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));
+}
+
+}
\ No newline at end of file