stdalone beacon without flowchart
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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 void init() 00054 { 00055 //reset() 00056 writereg(RF22_REG_07_OPERATING_MODE1,0x80); //switch_reset 00057 wait(1); //takes time to reset 00058 00059 clearTxBuf(); 00060 clearRxBuf(); 00061 //txfifoalmostempty 00062 writereg(RF22_REG_7D_TX_FIFO_CONTROL2,10); 00063 //rxfifoalmostfull 00064 writereg(RF22_REG_7E_RX_FIFO_CONTROL,20); 00065 //Packet-engine registers 00066 writereg(RF22_REG_30_DATA_ACCESS_CONTROL,0x06); //RF22_REG_30_DATA_ACCESS_CONTROL, RF22_ENPACRX | RF22_ENPACTX | RF22_ENCRC | RF22_CRC_CRC_16_IBM 00067 //&0x77 = diasable packet rx-tx handling 00068 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,4); //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,0xdf); 00106 writereg(RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE,0x03); 00107 writereg(RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE,0x39); 00108 writereg(RF22_REG_21_CLOCK_RECOVERY_OFFSET2,0x20); 00109 writereg(RF22_REG_22_CLOCK_RECOVERY_OFFSET1,0x68); //updated 20 to 25 reg values from excel sheet for 1.2 Khz freq. deviation,fsk 00110 writereg(RF22_REG_23_CLOCK_RECOVERY_OFFSET0,0xdc); 00111 writereg(RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1,0x00); 00112 writereg(RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0,0x6B); 00113 writereg(RF22_REG_2C_OOK_COUNTER_VALUE_1,0x2C); 00114 writereg(RF22_REG_2D_OOK_COUNTER_VALUE_2,0x11); //not required for fsk (OOK counter value) 00115 writereg(RF22_REG_2E_SLICER_PEAK_HOLD,0x2A); //?? 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_CONTROL2,0x21);//ook = 0x21 //fsk = 0x22 00122 writereg(RF22_REG_72_FREQUENCY_DEVIATION,0x50); 00123 //set tx power 00124 writereg(RF22_REG_6D_TX_POWER,0x07); //20dbm 00125 } 00126 int main() 00127 { 00128 wait(1); // wait for POR to complete //change the timing later 00129 cs=1; // chip must be deselected 00130 wait(1); //change the time later 00131 spi.format(8,0); 00132 spi.frequency(10000000); //10MHz SCLK 00133 if (readreg(RF22_REG_00_DEVICE_TYPE) == 0x08) pc.printf("spi connection valid\n"); 00134 else pc.printf("error in spi connection\n"); 00135 00136 init(); 00137 00138 00139 //init complete 00140 pc.printf("init complete.....press t to send\n"); 00141 00142 00143 //******** 00144 00145 while(1)//pc.getc()=='t') 00146 { 00147 /*uint8_t data[] = "Hello World!"; 00148 pc.printf("%d %d %d %d %d %d %d %d %d %d %d %d",data[0],data[1],data[2],data[3],data[4],data[5],data[6],data[7],data[8],data[9],data[10],data[11],data[12]);*/ 00149 00150 uint8_t data[500]; //starts from 0,1,2,3,4!!!; 00151 int i = 0; //for loops 00152 int u = 0; //universal count for hk array 00153 int n=0,bar = 0; 00154 //filling hk data 00155 /* 1 for(int n=0; n<4; n++) 00156 data[n] = 0x55; 00157 data[4] = 0x2D; 00158 data[5] = 0xD4; 00159 data[6] = 0xab; 00160 data[7] = 0xbc; 00161 data[8] = 0xcd; 00162 data[9] = 0xde; 00163 data[10]= 0xa9; 00164 for(int n=11; n<50; n++) 00165 data[n] = 0x5A; 00166 for(int n=50; n<60; n++) 00167 data[n] = 0x5A; 00168 for(int n=60; n<75; n++) 00169 data[n] = 0xCC; 00170 for(int n=75; n<97; n++) 00171 data[n] = 0xBC; 00172 for(int n=97; n<110; n++) 00173 data[n] = 0xEC; 00174 for(int n=110; n<TX_DATA; n++) 00175 data[n] = n; */ 00176 for(int i=0; i<7; i++){ 00177 data[n++] = 0x49; 00178 data[n++] = 0x49; 00179 data[n++] = 0x54; 00180 data[n++] = 0x4D; 00181 data[n++] = 0x53; 00182 data[n++] = 0x41; 00183 data[n++] = 0x54; 00184 } 00185 /*for(int n=150; n<180; n++) 00186 data[n] = 0xBC; 00187 for(int n=180; n<210; n++) 00188 data[n] = 0x6B; 00189 for(int n=210; n<330; n++) 00190 data[n] = 0x7D; 00191 for(int n=330; n<TX_DATA; n++) 00192 data[n] = 0xFF;*/ 00193 00194 //tx settings begin 00195 00196 //setModeIdle(); 00197 writereg(RF22_REG_07_OPERATING_MODE1,0x01); //ready mode 00198 //fillTxBuf(data, len); 00199 clearTxBuf(); 00200 //Filling Data into FIFO for the first time 00201 cs = 0; 00202 spi.write(0xFF); //fifo write access 00203 for(i=0; i< 20; i++) { //datalen; i++){ 00204 spi.write(data[i]); 00205 //pc.printf("0x%X \n",data[u+i]); 00206 } 00207 u=i;//check its 64 00208 cs = 1; 00209 //Set to Tx mode 00210 writereg(RF22_REG_07_OPERATING_MODE1,0x09); 00211 uint8_t reg=0x07; 00212 pc.printf("reg07 : 0x%X",readreg(reg)); 00213 //Check for fifoempty Thresh 00214 while((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x20) != 0x20) pc.printf("fifothresh1?\n"); 00215 00216 while(u!=TX_DATA) { 00217 if((TX_DATA - u) >= TIMES) 00218 bar = TIMES; 00219 else 00220 bar = (TX_DATA - u); 00221 00222 //writing again 00223 cs = 0; 00224 spi.write(0xFF); //FIFO write access 00225 for(i=0; i<bar; i++){ 00226 spi.write(data[u + i]); 00227 //pc.printf("0x%X \n",data[u+i]); 00228 } 00229 u = u + i; 00230 cs = 1; 00231 wait(0.01); 00232 //Check for fifoThresh 00233 while((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x20) != 0x20) pc.printf("fifothresh2?\n"); 00234 } 00235 //rf22.waitPacketSent(); 00236 while((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x04) != 0x04)pc.printf(" chck pkt sent!\n"); 00237 pc.printf(" packet sent "); 00238 00239 } 00240 }
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