rfm22 receive code for BAE

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main.cpp

00001 #include "beacon.h"
00002 Serial pc(USBTX, USBRX);          // tx, rx
00003 SPI spi(D11, D12, D13);              // mosi, miso, sclk
00004 DigitalOut cs(D10);                //slave select or chip select
00005 
00006 void writereg(uint8_t reg,uint8_t val)
00007 {
00008     cs = 0;__disable_irq();spi.write(reg | 0x80);spi.write(val);__enable_irq();cs = 1;
00009 }
00010 uint8_t readreg(uint8_t reg)
00011 {
00012     int val;cs = 0;__disable_irq();spi.write(reg & ~0x80);val = spi.write(0);__enable_irq();cs = 1;return val;
00013 }
00014 void clearTxBuf()
00015 {
00016     writereg(RF22_REG_08_OPERATING_MODE2,0x01);
00017     writereg(RF22_REG_08_OPERATING_MODE2,0x00);
00018 }
00019 void clearRxBuf()
00020 {
00021     writereg(RF22_REG_08_OPERATING_MODE2,0x02);
00022     writereg(RF22_REG_08_OPERATING_MODE2,0x00);
00023 }
00024 int setFrequency(float centre,float afcPullInRange)
00025 {
00026 //freq setting begins 
00027     uint8_t fbsel = 0x40;
00028     uint8_t afclimiter;
00029     if (centre >= 480.0) {
00030         centre /= 2;
00031         fbsel |= 0x20;
00032         afclimiter = afcPullInRange * 1000000.0 / 1250.0;
00033     } else {
00034         if (afcPullInRange < 0.0 || afcPullInRange > 0.159375)
00035             return false;
00036         afclimiter = afcPullInRange * 1000000.0 / 625.0;
00037     }
00038     centre /= 10.0;
00039     float integerPart = floor(centre);
00040     float fractionalPart = centre - integerPart;
00041  
00042     uint8_t fb = (uint8_t)integerPart - 24; // Range 0 to 23
00043     fbsel |= fb;
00044     uint16_t fc = fractionalPart * 64000;
00045     writereg(RF22_REG_73_FREQUENCY_OFFSET1, 0);  // REVISIT
00046     writereg(RF22_REG_74_FREQUENCY_OFFSET2, 0);
00047     writereg(RF22_REG_75_FREQUENCY_BAND_SELECT, fbsel);
00048     writereg(RF22_REG_76_NOMINAL_CARRIER_FREQUENCY1, fc >> 8);
00049     writereg(RF22_REG_77_NOMINAL_CARRIER_FREQUENCY0, fc & 0xff);
00050     writereg(RF22_REG_2A_AFC_LIMITER, afclimiter);
00051     return 0;
00052 }
00053 
00054 void init()
00055 {
00056     //reset()
00057     writereg(RF22_REG_07_OPERATING_MODE1,0x80);        //sw_reset
00058     wait(1);                    //takes time to reset                                  
00059 
00060     clearTxBuf();                                                             
00061     clearRxBuf();                                                             
00062     //txfifoalmostempty
00063     writereg(RF22_REG_7D_TX_FIFO_CONTROL2,10);
00064     //rxfifoalmostfull
00065     writereg(RF22_REG_7E_RX_FIFO_CONTROL,20);
00066     //Packet-engine registers
00067     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
00068     //&0x77 = diasable packet rx-tx handling
00069     writereg(RF22_REG_32_HEADER_CONTROL1,0x88);    //RF22_REG_32_HEADER_CONTROL1, RF22_BCEN_HEADER3 | RF22_HDCH_HEADER3
00070     writereg(RF22_REG_33_HEADER_CONTROL2,0x42);    //RF22_REG_33_HEADER_CONTROL2, RF22_HDLEN_4 | RF22_SYNCLEN_2
00071     writereg(RF22_REG_34_PREAMBLE_LENGTH,8);       //RF22_REG_34_PREAMBLE_LENGTH, nibbles); preamble length = 8;
00072     writereg(RF22_REG_36_SYNC_WORD3,0x2D);    //syncword3=2D
00073     writereg(RF22_REG_37_SYNC_WORD2,0xD4);    //syncword2=D4
00074     writereg(RF22_REG_3F_CHECK_HEADER3,0);    //RF22_REG_3F_CHECK_HEADER3, RF22_DEFAULT_NODE_ADDRESS
00075     writereg(RF22_REG_3A_TRANSMIT_HEADER3,0xab);    //header_to
00076     writereg(RF22_REG_3B_TRANSMIT_HEADER2,0xbc);    //header_from 
00077     writereg(RF22_REG_3C_TRANSMIT_HEADER1,0xcd);    //header_ids
00078     writereg(RF22_REG_3D_TRANSMIT_HEADER0,0xde);    //header_flags
00079     writereg(RF22_REG_3F_CHECK_HEADER3,0xab);   
00080     writereg(RF22_REG_40_CHECK_HEADER2,0xbc);   
00081     writereg(RF22_REG_41_CHECK_HEADER1,0xcd);   
00082     writereg(RF22_REG_42_CHECK_HEADER0,0xde); 
00083     
00084     //RSSI threshold for clear channel indicator
00085     writereg(RF22_REG_27_RSSI_THRESHOLD,0xA5);         //55 for -80dBm, 2D for -100dBm, 7D for -60dBm, A5 for -40dBm, CD for -20 dBm
00086     
00087     writereg(RF22_REG_0B_GPIO_CONFIGURATION0,0x15); // TX state                        ??
00088     writereg(RF22_REG_0C_GPIO_CONFIGURATION1,0x12); // RX state                        ??
00089     
00090     //interrupts
00091     // spiWrite(RF22_REG_05_INTERRUPT_ENABLE1, RF22_ENTXFFAEM |RF22_ENRXFFAFULL | RF22_ENPKSENT |RF22_ENPKVALID| RF22_ENCRCERROR);
00092     // spiWrite(RF22_REG_06_INTERRUPT_ENABLE2, RF22_ENPREAVAL);
00093     
00094     setFrequency(435.0, 0.05);
00095     
00096     //return !(statusRead() & RF22_FREQERR);
00097     if((readreg(RF22_REG_02_DEVICE_STATUS)& 0x08)!= 0x00)
00098     pc.printf("frequency not set properly\n");
00099     //frequency set
00100 
00101     //setModemConfig(FSK_Rb2_4Fd36);       FSK_Rb2_4Fd36,       ///< FSK, No Manchester, Rb = 2.4kbs,  Fd = 36kHz
00102     //setmodemregisters
00103     //0x1b, 0x03, 0x41, 0x60, 0x27, 0x52, 0x00, 0x07, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x22, 0x3a = FSK_RB2_4FD36
00104     //0xc8, 0x03, 0x39, 0x20, 0x68, 0xdc, 0x00, 0x6b, 0x2a, 0x08, 0x2a, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x21, 0x08 = OOK,2.4, 335
00105     writereg(RF22_REG_1C_IF_FILTER_BANDWIDTH,0x2B);
00106     writereg(RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE,0x03);
00107     writereg(RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE,0x41);
00108     writereg(RF22_REG_21_CLOCK_RECOVERY_OFFSET2,0x60);                     
00109     writereg(RF22_REG_22_CLOCK_RECOVERY_OFFSET1,0x27);           //updated 20 to 25 reg values from excel sheet for 1.2 Khz freq. deviation,fsk
00110     writereg(RF22_REG_23_CLOCK_RECOVERY_OFFSET0,0x52);
00111     writereg(RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1,0x00);
00112     writereg(RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0,0x51);
00113     /*writereg(RF22_REG_2C_OOK_COUNTER_VALUE_1,0x2a);
00114     writereg(RF22_REG_2D_OOK_COUNTER_VALUE_2,0x08);*/    //not required for fsk (OOK counter value)
00115     writereg(RF22_REG_2E_SLICER_PEAK_HOLD,0x1e);         //??
00116     writereg(RF22_REG_58,0x80);
00117     writereg(RF22_REG_69_AGC_OVERRIDE1,0x60);
00118     writereg(RF22_REG_6E_TX_DATA_RATE1,0x09);
00119     writereg(RF22_REG_6F_TX_DATA_RATE0,0xd5);
00120     writereg(RF22_REG_70_MODULATION_CONTROL1,0x2c);
00121     writereg(RF22_REG_71_MODULATION_CONTROL2,0x22);//ook = 0x21 //fsk = 0x22
00122     writereg(RF22_REG_72_FREQUENCY_DEVIATION,0x02);
00123     //set tx power
00124     writereg(RF22_REG_6D_TX_POWER,0x07);    //20dbm
00125     writereg(RF22_REG_3E_PACKET_LENGTH,RX_DATA); //packet length     
00126 
00127 }
00128 int main()
00129 {
00130     wait(1);                     // wait for POR to complete   //change the timing later
00131     cs=1;                          // chip must be deselected
00132     wait(1);                    //change the time later
00133     spi.format(8,0);
00134     spi.frequency(10000000);       //10MHz SCLK    
00135     if (readreg(RF22_REG_00_DEVICE_TYPE) == 0x08) pc.printf("spi connection valid\n");
00136     else pc.printf("error in spi connection\n");
00137 
00138     init();
00139     
00140     //init complete
00141     pc.printf("init complete....\n");
00142     
00143     //********
00144 
00145 while(1)//pc.getc()=='r')
00146 {
00147     uint8_t data[255];         // for filling the received data
00148     int u=0,i=0;
00149     int bar = TIMES;
00150     //rf22.waitAvailable();
00151     clearTxBuf();                                                             
00152     clearRxBuf();                                                             
00153     //setModeRx();
00154     writereg(RF22_REG_07_OPERATING_MODE1,0x04);//rxon
00155     while((readreg(RF22_REG_04_INTERRUPT_STATUS2)& 0x10) != 0x10) ;
00156     //pc.printf("rssi?\n");
00157     //preamble??
00158     while(!(readreg(0x04)&0x40))
00159     pc.printf("detecting preamble\n");
00160     //checking syncword
00161     while(!(readreg(RF22_REG_04_INTERRUPT_STATUS2)& 0x80))
00162     pc.printf("sync?\n");
00163             //check for fifothreshold
00164     //while((readreg(0x03)& 0x10) != 0x10)
00165     //    pc.printf("fifo1?\n");
00166     while(u != RX_DATA)//fifo_thresh
00167     {                
00168     pc.printf("1 \n");
00169     if((RX_DATA - u) > TIMES)
00170     {
00171         //check for fifo_thresh
00172         while((readreg(RF22_REG_03_INTERRUPT_STATUS1)& 0x10) != 0x10)
00173             pc.printf("fifo2?\n");
00174         bar = TIMES;
00175         //reading
00176         cs = 0;
00177         spi.write(0x7F);
00178         for(i=0; i<bar;i++){
00179         data[u+i] = spi.write(0);
00180         //pc.printf("0x%X \n",data[u+i]);
00181         }
00182         u=u+i;
00183         pc.printf("u= %d \n",u); 
00184         cs = 1;            
00185     }
00186     else
00187     {
00188         pc.printf("2\n");
00189         wait(0.15);
00190         bar = RX_DATA - u;
00191         //reading
00192         cs = 0;
00193         spi.write(0x7F);
00194         for(i=0; i<bar;i++){
00195         data[u+i] = spi.write(0);
00196         //pc.printf("0x%X \n",data[u+i]);        
00197         }
00198         u=u+i;
00199         cs = 1;    
00200         pc.printf("u= %d \n",u);
00201     }        
00202     }  
00203     //packet valid??
00204     while(!(readreg(RF22_REG_03_INTERRUPT_STATUS1)& 0x02))
00205     pc.printf("checking if packet is valid\n");  
00206     
00207     //while(1)
00208     //    pc.printf("0x%X  0x%X  *** ",readreg(0x03),readreg(0x04));
00209     pc.printf("packet valid\n");
00210     //4Breceived packet length
00211     //while(0x)
00212     
00213     /*//Printing data
00214     for(int i=0; i<RX_DATA; i++)
00215     pc.printf("0x%X \n",data[i]);
00216     //for(int i = 0; i<12; i++)
00217     //    pc.printf("%c ",data[i]);
00218     //while(!(readreg(0x04)&0x40))
00219     //pc.printf("detecting preamble\n");   */
00220     pc.printf("Received data:\n");
00221     //for(int i=0;i<240;i++) pc.printf("0x%X",hk[i]);
00222     // converting uint_8 to bool
00223     bool shortbeacon[120];
00224     for(int i = 0; i<120; i++)
00225     data[2*i] == 0xFF ? shortbeacon[i] = 1 :shortbeacon[i] =  0; 
00226     /*for(int i = 0; i<120 ; i++)
00227     pc.printf(" %d \n",shortbeacon[i]);*/
00228     
00229     //converting bool to uint_8
00230     uint8_t s_beacon[15];
00231     for(int i = 0, m =0 ; i < 15 ; i++ )
00232     for(int n = 0; n < 8; n++,m++)
00233     {
00234         if(shortbeacon[m])
00235         {
00236              s_beacon[i]<<=1;
00237              s_beacon[i] |= 0x01;
00238         }  
00239         else
00240         s_beacon[i] <<= 1;
00241     }
00242     
00243     
00244     pc.printf("Call Sign : ");
00245     for(int i = 0; i<7 ; i++)
00246     pc.printf(" %X ",s_beacon[i]);
00247     
00248     pc.printf("\n\nVoltage[0] : ");
00249     pc.printf(" 0x%X \n\n",s_beacon[7]);
00250     
00251     pc.printf("AngularSpeed[0] : ");
00252     pc.printf(" 0x%X \n\n",s_beacon[8]);
00253     
00254     pc.printf("AngularSpeed[1] : ");
00255     pc.printf(" 0x%X \n\n",s_beacon[9]);
00256     
00257     pc.printf("SubsystemStatus[0] : ");
00258     pc.printf(" 0x%X \n\n",s_beacon[10]);
00259 
00260     pc.printf("Temp[0] : ");
00261     pc.printf(" 0x%X \n\n",s_beacon[11]);
00262     
00263     pc.printf("Temp[1] : ");
00264     pc.printf(" 0x%X \n\n",s_beacon[12]);
00265     
00266     pc.printf("Temp[2] : ");
00267     pc.printf(" 0x%X \n\n",s_beacon[13]);
00268     
00269     pc.printf("ErrorFlag[0] : ");
00270     pc.printf(" 0x%X \n\n",s_beacon[14]);
00271     pc.printf("received headers : \n");
00272     pc.printf("header1 = 0x%X , header2 = 0x%X , header3 = 0x%X , header4 = 0x%X \n",readreg(0x47),readreg(0x48),readreg(0x49),readreg(0x4A));
00273 }
00274 
00275 }