beacon.cpp

00001 //switch off the sync!!!!!!!
00002 //switch off the preamble!!!!!!!
00003 /*for crc in tx:
00004 regIrq2(0x28) :
00005 
00006 regpacketconfig 1(0x37) :
00007 set crc detection/calc. on : | 0x10
00008 crcautoclearoff : | 0x08  
00009 
00010 for data whitening : regpacketconfig 1(0x37) :| 0x40
00011 for 
00012 
00013 
00014 
00015 */
00016 // 6CC000 for 435 MHz
00017 //set all values as FF for checking on spectrum analyzer
00018 
00019 #include "beacon.h"
00020 #include "EPS.h"
00021 #include "pin_config.h"
00022 Serial pc_bea(USBTX, USBRX);           // tx, rx
00023 DigitalOut cs(PIN6);                 //slave select or chip select
00024 SPI spi(PIN16,PIN17,PIN15);
00025 //DigitalOut cs_bar(PTC11);              //slave select or chip select
00026 //InterruptIn button(p9);
00027 //#define TIMES 16      
00028 //Timer t;
00029 
00030 /*void interrupt_func()
00031 {
00032     pc_bea.printf("INTERRUPT_FUNC TRIGGERED\n  wait for 3 secs\n"); 
00033     wait(3);
00034     
00035 }*/
00036 
00037 /***********************************************global variable declaration***************************************************************/
00038 extern uint32_t BAE_STATUS;
00039 extern uint32_t BAE_ENABLE;
00040 extern  ShortBeacy Shortbeacon;
00041 
00042 void writereg(uint8_t reg,uint8_t val)
00043 {
00044     cs = 0;__disable_irq();spi.write(reg | 0x80);spi.write(val);__enable_irq();cs = 1;
00045 }
00046 uint8_t readreg(uint8_t reg)
00047 {
00048     int val;cs = 0;__disable_irq();spi.write(reg & ~0x80);val = spi.write(0);__enable_irq();cs = 1;return val;
00049 }
00050 void clearTxBuf()
00051 {
00052     writereg(RF22_REG_08_OPERATING_MODE2,0x01);
00053     writereg(RF22_REG_08_OPERATING_MODE2,0x00);
00054 }
00055 void clearRxBuf()
00056 {
00057     writereg(RF22_REG_08_OPERATING_MODE2,0x02);
00058     writereg(RF22_REG_08_OPERATING_MODE2,0x00);
00059 }
00060 int setFrequency(float centre,float afcPullInRange)
00061 {
00062 //freq setting begins 
00063     uint8_t fbsel = 0x40;
00064     uint8_t afclimiter;
00065     if (centre >= 480.0) {
00066         centre /= 2;
00067         fbsel |= 0x20;
00068         afclimiter = afcPullInRange * 1000000.0 / 1250.0;
00069     } else {
00070         if (afcPullInRange < 0.0 || afcPullInRange > 0.159375)
00071             return false;
00072         afclimiter = afcPullInRange * 1000000.0 / 625.0;
00073     }
00074     centre /= 10.0;
00075     float integerPart = floor(centre);
00076     float fractionalPart = centre - integerPart;
00077  
00078     uint8_t fb = (uint8_t)integerPart - 24; // Range 0 to 23
00079     fbsel |= fb;
00080     uint16_t fc = fractionalPart * 64000;
00081     writereg(RF22_REG_73_FREQUENCY_OFFSET1, 0);  // REVISIT
00082     writereg(RF22_REG_74_FREQUENCY_OFFSET2, 0);
00083     writereg(RF22_REG_75_FREQUENCY_BAND_SELECT, fbsel);
00084     writereg(RF22_REG_76_NOMINAL_CARRIER_FREQUENCY1, fc >> 8);
00085     writereg(RF22_REG_77_NOMINAL_CARRIER_FREQUENCY0, fc & 0xff);
00086     writereg(RF22_REG_2A_AFC_LIMITER, afclimiter);
00087     return 0;
00088 }
00089     
00090 
00091 
00092 void FCTN_BEA_INIT()
00093 {
00094     BAE_STATUS |= 0x00000004;                //set BEA_INIT_STATUS  flag
00095     writereg(RF22_REG_07_OPERATING_MODE1,0x80);        //sw_reset
00096     wait(1);                    //takes time to reset                                  
00097 
00098     clearTxBuf();                                                             
00099     clearRxBuf();                                                             
00100     //txfifoalmostempty
00101     writereg(RF22_REG_7D_TX_FIFO_CONTROL2,5);
00102     //rxfifoalmostfull
00103     writereg(RF22_REG_7E_RX_FIFO_CONTROL,20);
00104     //Packet-engine registers
00105     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
00106     //&0x77 = diasable packet rx-tx handling
00107     writereg(RF22_REG_32_HEADER_CONTROL1,0x88);    //RF22_REG_32_HEADER_CONTROL1, RF22_BCEN_HEADER3 | RF22_HDCH_HEADER3
00108     writereg(RF22_REG_33_HEADER_CONTROL2,0x42);    //RF22_REG_33_HEADER_CONTROL2, RF22_HDLEN_4 | RF22_SYNCLEN_2
00109     writereg(RF22_REG_34_PREAMBLE_LENGTH,8);       //RF22_REG_34_PREAMBLE_LENGTH, nibbles); preamble length = 8;
00110     writereg(RF22_REG_36_SYNC_WORD3,0x2D);    //syncword3=2D
00111     writereg(RF22_REG_37_SYNC_WORD2,0xD4);    //syncword2=D4
00112     writereg(RF22_REG_3F_CHECK_HEADER3,0);    //RF22_REG_3F_CHECK_HEADER3, RF22_DEFAULT_NODE_ADDRESS
00113     writereg(RF22_REG_3A_TRANSMIT_HEADER3,0xab);    //header_to
00114     writereg(RF22_REG_3B_TRANSMIT_HEADER2,0xbc);    //header_from 
00115     writereg(RF22_REG_3C_TRANSMIT_HEADER1,0xcd);    //header_ids
00116     writereg(RF22_REG_3D_TRANSMIT_HEADER0,0xde);    //header_flags
00117     writereg(RF22_REG_3F_CHECK_HEADER3,0xab);   
00118     writereg(RF22_REG_40_CHECK_HEADER2,0xbc);   
00119     writereg(RF22_REG_41_CHECK_HEADER1,0xcd);   
00120     writereg(RF22_REG_42_CHECK_HEADER0,0xde);
00121     
00122     //RSSI threshold for clear channel indicator
00123     writereg(RF22_REG_27_RSSI_THRESHOLD,0xA5);         //55 for -80dBm, 2D for -100dBm, 7D for -60dBm, A5 for -40dBm, CD for -20 dBm
00124     
00125     writereg(RF22_REG_0B_GPIO_CONFIGURATION0,0x15); // TX state                        ??
00126     writereg(RF22_REG_0C_GPIO_CONFIGURATION1,0x12); // RX state                        ??
00127     
00128     //interrupts
00129     // spiWrite(RF22_REG_05_INTERRUPT_ENABLE1, RF22_ENTXFFAEM |RF22_ENRXFFAFULL | RF22_ENPKSENT |RF22_ENPKVALID| RF22_ENCRCERROR);
00130     // spiWrite(RF22_REG_06_INTERRUPT_ENABLE2, RF22_ENPREAVAL);
00131     
00132     setFrequency(435.0, 0.05);
00133     
00134     //return !(statusRead() & RF22_FREQERR);
00135     if((readreg(RF22_REG_02_DEVICE_STATUS)& 0x08)!= 0x00)
00136     printf("frequency not set properly\n");
00137     //frequency set
00138 
00139     //setModemConfig(FSK_Rb2_4Fd36);       FSK_Rb2_4Fd36,       ///< FSK, No Manchester, Rb = 2.4kbs,  Fd = 36kHz
00140     //setmodemregisters
00141     //0x1b, 0x03, 0x41, 0x60, 0x27, 0x52, 0x00, 0x07, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x22, 0x3a = FSK_RB2_4FD36
00142     //0xc8, 0x03, 0x39, 0x20, 0x68, 0xdc, 0x00, 0x6b, 0x2a, 0x08, 0x2a, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x21, 0x08 = OOK,2.4, 335
00143     writereg(RF22_REG_1C_IF_FILTER_BANDWIDTH,0x2B);
00144     writereg(RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE,0x03);
00145     writereg(RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE,0x41);
00146     writereg(RF22_REG_21_CLOCK_RECOVERY_OFFSET2,0x60);                     
00147     writereg(RF22_REG_22_CLOCK_RECOVERY_OFFSET1,0x27);           //updated 20 to 25 reg values from excel sheet for 1.2 Khz freq. deviation,fsk
00148     writereg(RF22_REG_23_CLOCK_RECOVERY_OFFSET0,0x52);
00149     writereg(RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1,0x00);
00150     writereg(RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0,0x51);
00151     /*writereg(RF22_REG_2C_OOK_COUNTER_VALUE_1,0x2a);
00152     writereg(RF22_REG_2D_OOK_COUNTER_VALUE_2,0x08);*/    //not required for fsk (OOK counter value)
00153     writereg(RF22_REG_2E_SLICER_PEAK_HOLD,0x1e);         //??
00154     writereg(RF22_REG_58,0x80);
00155     writereg(RF22_REG_69_AGC_OVERRIDE1,0x60);
00156     writereg(RF22_REG_6E_TX_DATA_RATE1,0x09);
00157     writereg(RF22_REG_6F_TX_DATA_RATE0,0xd5);
00158     writereg(RF22_REG_70_MODULATION_CONTROL1,0x2c);
00159     writereg(RF22_REG_71_MODULATION_CONTROL2,0x22);//ook = 0x21 //fsk = 0x22
00160     writereg(RF22_REG_72_FREQUENCY_DEVIATION,0x02);
00161     //set tx power
00162     writereg(RF22_REG_6D_TX_POWER,0x07);    //20dbm
00163     writereg(RF22_REG_3E_PACKET_LENGTH,TX_DATA); //packet length  
00164     BAE_STATUS &= 0xFFFFFFFB;            //clear BEA_INIT_STATUS flag  
00165 }
00166 
00167 void FCTN_BEA_TX_MAIN()
00168 {
00169     //FCTN_BEA_INIT(); 
00170     BAE_STATUS |= 0x00000008;            //set BEA_TX_MAIN_STATUS flag
00171     printf("\nBeacon function entered\n");
00172     wait(1);                     // wait for POR to complete   //change the timing later
00173     cs=1;                          // chip must be deselected
00174     wait(1);                    //change the time later
00175     spi.format(8,0);
00176     spi.frequency(10000000);       //10MHz SCLK    
00177     if (readreg(RF22_REG_00_DEVICE_TYPE) == 0x08) printf("spi connection valid\n");
00178     else printf("error in spi connection\n");
00179 
00180        
00181     
00182     //********
00183     //button.rise(&interrupt_func);         //interrupt enabled ( rising edge of pin 9)
00184     wait(0.02);                                                           // pl. update this value  or even avoid it!!!                  
00185     //extract values from short_beacon[]
00186     uint8_t byte_counter = 0;
00187     /*struct Short_beacon{
00188         uint8_t Voltage[1];
00189         uint8_t AngularSpeed[2];
00190         uint8_t SubsystemStatus[1];
00191         uint8_t Temp[3];
00192         uint8_t ErrorFlag[1];
00193         }Shortbeacon = { {0x88}, {0x99, 0xAA} , {0xAA},{0xAA,0xDD,0xEE}, {0x00} };
00194     */
00195     //filling hk data
00196     uint8_t short_beacon[] = { 0xAB, 0x8A, 0xE2, 0xBB, 0xB8, 0xA2, 0x8E,Shortbeacon.Voltage[0],Shortbeacon.AngularSpeed[0], Shortbeacon.AngularSpeed[1],Shortbeacon.SubsystemStatus[0],Shortbeacon.Temp[0],Shortbeacon.Temp[1],Shortbeacon.Temp[2],Shortbeacon.ErrorFlag[0]};
00197     
00198     for(int i = 0; i < 15 ; i++)
00199     {
00200         printf("0x%X\n",(short_beacon[i]));    
00201     }
00202     //tx settings begin
00203     //setModeIdle();
00204     writereg(RF22_REG_07_OPERATING_MODE1,0x01);        //ready mode
00205     //fillTxBuf(data, len);
00206     clearTxBuf();  
00207         
00208     //Set to Tx mode
00209     writereg(RF22_REG_07_OPERATING_MODE1,0x09);
00210     
00211     while(byte_counter!=15){
00212         //Check for fifoThresh
00213         while((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x20) != 0x20);
00214         //writing again
00215         cs = 0;
00216         spi.write(0xFF);   
00217         for(int i=7; i>=0 ;i--)
00218         {
00219             //pc.printf("%d\n",byte_counter);
00220             if((short_beacon[byte_counter] & (uint8_t) pow(2.0,i))!=0)
00221         {
00222             spi.write(0xFF);
00223             spi.write(0xFF);
00224         }
00225         else
00226         {
00227             spi.write(0x00);
00228             spi.write(0x00);
00229             
00230         }
00231         }
00232         cs = 1;
00233         byte_counter++;
00234         
00235     }  
00236     //rf22.waitPacketSent();
00237     while((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x04) != 0x04);//pc.printf(" chck pkt sent!\n");     
00238     printf("\nBeacon function exiting\n");
00239     BAE_STATUS &= 0xFFFFFFF7;             // clear BEA_TX_MAIN_STATUS flag
00240 }