BCN.cpp

00001 
00002 #include "BCN.h"
00003 #include <stdio.h>
00004 #include "pin_config.h"
00005 //Check the pin names
00006 //Takes max 4.3 sec in void FCTN_BCN_TX_MAIN() (temp.calc. + long_beacon + short_beacon) 
00007 
00008 Serial pc_bcn(USBTX, USBRX);        //tx,rx
00009 SPI spi(PIN16, PIN17, PIN15);              // mosi, miso, sclk 
00010 DigitalOut cs(PIN6);                //slave select or chip select
00011 Timer t_i;
00012 Timeout rf_sl_timeout;
00013 Ticker loop;
00014 
00015 //GLOBAL VARIABLES
00016 uint8_t BCN_INIT_STATUS = 0;
00017 uint8_t BCN_TX_MAIN_STATUS = 0;
00018 uint8_t BCN_TX_STATUS = 0;
00019 uint8_t BCN_TX_EN = 1;              //hardcoding for now    //check where is this variable toggled??
00020 uint8_t BCN_FEN = 0;                //hardcoding for now    //write this value to flash
00021 uint8_t BCN_STANDBY = 0;            //hardcoding for now    //check where is this variable toggled??
00022 uint8_t BCN_TS_BUFFER = 0;              // For Temperature 
00023 
00024 void FCTN_BCN_INIT()
00025 {
00026     pc_bcn.printf("FCTN_BCN_INIT\n");
00027     BCN_INIT_STATUS = 1;
00028     if(BCN_FEN == 0)
00029         rf_sl_timeout.attach(&FCTN_BCN_FEN, 30);
00030     Init_BEACON_HW();
00031     BCN_INIT_STATUS = 0;
00032 }
00033 void FCTN_BCN_FEN()
00034 {
00035     pc_bcn.printf("FCTN_FEN\n");
00036     BCN_FEN = 1;//write this value to flash
00037 }
00038 void FCTN_BCN_TX_MAIN()
00039 {
00040     pc_bcn.printf("FCTN_BCN_TX_MAIN\n");
00041     t_i.start();
00042     int begin = t_i.read_us();
00043     BCN_TX_MAIN_STATUS = 1;
00044     
00045     if(BCN_FEN == 1)
00046     {
00047         if(BCN_TX_EN == 1)
00048         {
00049             //Measure and store BCN temperature in BCN_TS_BUFFER
00050             BCN_TS_BUFFER = check_Temperature();
00051             pc_bcn.printf("\n\ntemperature = %d\n\n",BCN_TS_BUFFER);
00052             //Get BCN_HK data from BCN HW(SPI) //Store BCN_HK data in BCN_HK_BUFFER
00053             if(BCN_STANDBY == 1 )
00054             {
00055                 Set_BCN_TX_STATUS(BCN_TX_STANDBY);
00056                 BCN_TX_MAIN_STATUS = 0;
00057                 
00058                 // break;
00059             }
00060             else
00061             {       
00062                     //transmit short beacon and long beacon
00063                     //SHORT_BCN_TX();
00064                     LONG_BCN_TX();
00065                     
00066                     if(Check_ACK_RECEIVED() == 1)
00067                     {
00068                         Set_BCN_TX_STATUS(BCN_TX_SUCCESS);
00069                         BCN_TX_MAIN_STATUS = 0;   
00070                     }
00071                     else
00072                     {
00073                         Set_BCN_TX_STATUS(BCN_TX_FAILURE);
00074                         BCN_TX_MAIN_STATUS = 0;
00075                         
00076                     }
00077              }
00078         }
00079         else
00080         {
00081             Set_BCN_TX_STATUS(BCN_TX_DISABLED);
00082             BCN_TX_MAIN_STATUS = 0;
00083         }
00084     }
00085     else
00086     {
00087         Set_BCN_TX_STATUS(BCN_RF_SILENCE);  //Window of RF Silence: None of the Txs should be on.
00088         BCN_TX_MAIN_STATUS = 0;
00089     }
00090     t_i.stop();
00091     int end = t_i.read_us();
00092     pc_bcn.printf("The time required for FCTN_BCN_TX_MAIN is %d useconds\r\n", end-begin);
00093     
00094 }
00095 
00096 void Set_BCN_TX_STATUS(uint8_t STATUS)
00097 {
00098     BCN_TX_STATUS = STATUS;
00099 }
00100 
00101 uint8_t check_Temperature()
00102 {   
00103     uint8_t temperature;
00104     writereg(RF22_REG_0F_ADC_CONFIGURATION,0x00);            
00105     writereg(RF22_REG_12_Temperature_Sensor_Calibration,0x20);
00106     writereg(RF22_REG_0F_ADC_CONFIGURATION,0x80);
00107     wait(0.1);
00108     temperature = readreg(RF22_REG_11_ADC_Value);
00109     temperature = (float)temperature*0.5 - 64;
00110     return temperature;
00111 }
00112 
00113 void SHORT_BCN_TX()
00114 {
00115     writereg(RF22_REG_6E_TX_DATA_RATE,0x01);
00116     writereg(RF22_REG_6F_TX_DATA_RATE,0x50);//160bps
00117     writereg(RF22_REG_3E_PACKET_LENGTH,SHORT_TX_DATA); //short packet length 
00118     wait(0.02);      
00119                                                                            
00120     uint32_t timeout_count = 10e5;
00121     //extract values from short_beacon[]
00122     
00123     struct Short_beacon
00124     {
00125         uint8_t Voltage[1];
00126         uint8_t AngularSpeed[2];
00127         uint8_t SubsystemStatus[1];
00128         uint8_t Temp[3];
00129         uint8_t ErrorFlag[1];
00130     }Shortbeacon = { {0x88}, {0x99, 0xAA} , {0xAA},{0xAA,0xDD,0xEE}, {0x00} };
00131     
00132     //filling hk data
00133     //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]};
00134     uint8_t short_beacon[] = { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,Shortbeacon.Voltage[0],Shortbeacon.AngularSpeed[0], Shortbeacon.AngularSpeed[1],Shortbeacon.SubsystemStatus[0],Shortbeacon.Temp[0],Shortbeacon.Temp[1],Shortbeacon.Temp[2],Shortbeacon.ErrorFlag[0]};
00135            
00136     clearTxBuf();     
00137     //writing data first time
00138     int byte = 0;
00139     cs = 0;
00140     spi.write(0xFF);   
00141 
00142     for (int byte_counter = 0; byte_counter <15 ; byte_counter++)
00143     {
00144         for(int j = 3; j >= 0 ; j--)
00145         {
00146             if((short_beacon[byte_counter] & (uint8_t) pow(2.0,(j*2+1)))!= pow(2.0,(j*2+1)))
00147             {
00148                 byte=0x00;
00149             }
00150             else
00151             { 
00152                 byte=0xF0;
00153             }  
00154             if((short_beacon[byte_counter] & (uint8_t) pow(2.0,j*2))!= pow(2.0,j*2))
00155             {
00156                 byte=byte | 0x00;
00157             }
00158             else
00159             { 
00160                byte=byte | 0x0F;
00161             }
00162             spi.write(byte);
00163          }
00164     }   
00165     
00166     cs = 1;
00167     
00168     //Set to Tx mode
00169     writereg(RF22_REG_07_OPERATING_MODE1,0x08);//*
00170     wait(0.1);  
00171     //Check for fifoThresh
00172     while(timeout_count--)if((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x20) == 0x20)break;
00173     timeout_count=10e5;
00174     
00175     //Check for packet_sent
00176     while(timeout_count--)if((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x04) == 0x04)break;
00177     
00178     //pc_bcn.printf("Short packet sent\r\n");
00179     
00180     writereg(RF22_REG_07_OPERATING_MODE1,0x00);        //standby mode
00181     
00182 }
00183 void LONG_BCN_TX()
00184 {
00185     writereg(RF22_REG_6E_TX_DATA_RATE,0x08);
00186     writereg(RF22_REG_6F_TX_DATA_RATE,0x31);//1000 bps
00187     writereg(RF22_REG_3E_PACKET_LENGTH,LONG_TX_DATA); //long packet length
00188     wait(0.02);                                                           
00189     uint32_t timeout_count=10e5;
00190    
00191     //get long_beacon array
00192     
00193     uint8_t Long_beacon[125];
00194     for(int i = 0;i<125;)
00195     {
00196         Long_beacon[i++] = 0xAA;
00197     }
00198    
00199    
00200    
00201     
00202     //setModeIdle();
00203     clearTxBuf();     
00204     //writing data first time
00205     cs = 0;
00206     spi.write(0xFF);   
00207     for(int i=0; i<60;i++)
00208     {
00209         spi.write(Long_beacon[i]);
00210     }
00211     cs = 1;
00212     
00213     //Set to Tx mode
00214     writereg(RF22_REG_07_OPERATING_MODE1,0x08);//*
00215     wait(0.1);
00216     
00217     //Check for fifoThresh
00218     while(timeout_count--)if((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x20) == 0x20)break;
00219     timeout_count=10e5;
00220     
00221     cs = 0;
00222     spi.write(0xFF);   
00223     for(int i=60; i<125;i++)
00224     {
00225         spi.write(Long_beacon[i]);
00226     }
00227     cs = 1;
00228     wait(0.1);
00229     //Check for fifoThresh
00230     while(timeout_count--)if((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x20) == 0x20)break;
00231     timeout_count=10e5;
00232     
00233     //Check for packetsent interrupt
00234     while(timeout_count--)if((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x04) == 0x04)break;
00235          
00236     //pc_bcn.printf("Long packet sent\r\n");
00237     
00238     writereg(RF22_REG_07_OPERATING_MODE1,0x00);        //standby mode
00239 }
00240 void reset_rfm()
00241 {
00242     FCTN_BCN_INIT();
00243 }
00244 void writereg(uint8_t reg,uint8_t val)
00245 {
00246     uint8_t count = 0; 
00247     for(;;count++)
00248     {
00249         int read_val =0; cs = 0;spi.write(reg | 0x80);spi.write(val);cs = 1;
00250         if(reg != 0x7 && reg != 0x58 && reg != 0xF) 
00251         {        
00252             read_val = readreg(reg);
00253             if (read_val == val)
00254             {
00255                 break;    
00256             }
00257             else if(count == 5)
00258             {
00259                 reset_rfm(), printf("reg = 0x%X\n",reg);break;
00260             }
00261         }
00262         else
00263         break;
00264     }
00265 }   
00266 uint8_t readreg(uint8_t reg)
00267 {
00268     uint8_t val;cs = 0;spi.write(reg & ~0x80);val = spi.write(0);cs = 1;return val;
00269 }
00270 void clearTxBuf()
00271 {
00272     writereg(RF22_REG_08_OPERATING_MODE2,0x01);
00273     writereg(RF22_REG_08_OPERATING_MODE2,0x00);
00274 }
00275 uint8_t setFrequency(double centre)
00276 {
00277     uint8_t fbsel = 0x40;
00278     if (centre >= 480.0) {
00279         centre /= 2;
00280         fbsel |= 0x20;
00281     } 
00282     centre /= 10.0;
00283     double integerPart = floor(centre);
00284     double fractionalPart = centre - integerPart;
00285  
00286     uint8_t fb = (uint8_t)integerPart - 24; // Range 0 to 23
00287     fbsel |= fb;
00288     uint16_t fc = fractionalPart * 64000;
00289     writereg(RF22_REG_73_FREQUENCY_OFFSET1, 0);  // REVISIT
00290     writereg(RF22_REG_74_FREQUENCY_OFFSET2, 0);
00291     writereg(RF22_REG_75_FREQUENCY_BAND_SELECT, fbsel);
00292     writereg(RF22_REG_76_NOMINAL_CARRIER_FREQUENCY1, fc >> 8);
00293     writereg(RF22_REG_77_NOMINAL_CARRIER_FREQUENCY0, fc & 0xff);
00294     return 0;
00295 }
00296 
00297 
00298 void Init_BEACON_HW()
00299 {
00300     wait(0.1);
00301     cs=1;                          // chip must be deselected
00302     wait(0.1);
00303     spi.format(8,0);
00304     spi.frequency(10000000);       //10MHz SCLK
00305     
00306     //should either have a flag for invalid SPI or discard this for actual case or add reset
00307     if (readreg(RF22_REG_00_DEVICE_TYPE) == 0x08)
00308         pc_bcn.printf("spi connection valid\r\n");
00309     else
00310         {pc_bcn.printf("error in spi connection\r\n");
00311         reset_rfm();
00312         }
00313     
00314     writereg(RF22_REG_07_OPERATING_MODE1,0x80);        //sw_reset
00315     wait(0.1);                    //takes time to reset                                  
00316 
00317     clearTxBuf();                                                                                                                        
00318     
00319     writereg(RF22_REG_07_OPERATING_MODE1,0x00);        //standby mode
00320        
00321     //txfifoalmostempty
00322     writereg(RF22_REG_7D_TX_FIFO_CONTROL2,30);
00323 
00324     //Packet-engine registers
00325     writereg(RF22_REG_30_DATA_ACCESS_CONTROL,0x00); 
00326     
00327     writereg(RF22_REG_33_HEADER_CONTROL2,0x08);    
00328     writereg(RF22_REG_34_PREAMBLE_LENGTH,0x00);       
00329 
00330     writereg(RF22_REG_0B_GPIO_CONFIGURATION0,0x15); // TX state                        
00331     writereg(RF22_REG_0C_GPIO_CONFIGURATION1,0x12); // RX state                        
00332 
00333     setFrequency(435.0);
00334 
00335     if((readreg(RF22_REG_02_DEVICE_STATUS)& 0x08)!= 0x00)
00336         {
00337             pc_bcn.printf("frequency not set properly\r\n");
00338             reset_rfm();
00339         }
00340 
00341     //set Modem Configuration
00342     //writereg(RF22_REG_1C_IF_FILTER_BANDWIDTH,0xdf);
00343     //writereg(RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE,0x03);
00344     //writereg(RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE,0x39);
00345     //writereg(RF22_REG_21_CLOCK_RECOVERY_OFFSET2,0x20);                     
00346     //writereg(RF22_REG_22_CLOCK_RECOVERY_OFFSET1,0x68);           //updated 20 to 25 reg values from excel sheet for 1.2 Khz freq. deviation,fsk
00347     //writereg(RF22_REG_23_CLOCK_RECOVERY_OFFSET0,0xdc);
00348     //writereg(RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1,0x00);
00349     //writereg(RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0,0x6B);
00350     //writereg(RF22_REG_2C_OOK_COUNTER_VALUE_1,0x2C);
00351     //writereg(RF22_REG_2D_OOK_COUNTER_VALUE_2,0x11);    //not required for fsk (OOK counter value)
00352     //writereg(RF22_REG_2E_SLICER_PEAK_HOLD,0x2A);         //??
00353     writereg(RF22_REG_58,0x80);
00354     //writereg(RF22_REG_69_AGC_OVERRIDE1,0x60);
00355     
00356     //Data rate set later
00357       
00358     writereg(RF22_REG_70_MODULATION_CONTROL1,0x20);
00359     writereg(RF22_REG_71_MODULATION_CONTROL2,0x21);//ook = 0x21
00360     
00361     //set tx power
00362     writereg(RF22_REG_6D_TX_POWER,0x07);    //20dbm
00363     
00364     //TX_packet_length written later
00365 }
00366 bool Check_ACK_RECEIVED()
00367 {
00368     if((readreg(RF22_REG_03_INTERRUPT_STATUS1) & 0x04) == 0x04)  
00369     {
00370         printf("Packet sent: ACK received\r\n");
00371         return 1;   
00372     }
00373     else
00374     {
00375         pc_bcn.printf("Packet not sent\r\n");
00376         return 0;
00377     }
00378 }
00379 /*int main()
00380 {
00381     FCTN_BCN_INIT(); 
00382     
00383     loop.attach(&FCTN_BCN_TX_MAIN, 10.0);//in actual case its 30.0
00384     
00385     while(1);
00386     
00387 }*/