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 #include "beacon.h"
00019 #include "HK.h"
00020 Serial chavan(USBTX, USBRX);           // tx, rx
00021 SPI spi(PTD6,PTD7,PTD5);               // mosi, miso, sclk
00022 DigitalOut cs_bar(D5);                 //slave select or chip select
00023 //InterruptIn button(p9);
00024 //#define TIMES 16      
00025 //Timer t;
00026 
00027 /*void interrupt_func()
00028 {
00029     chavan.printf("INTERRUPT_FUNC TRIGGERED\n  wait for 3 secs\n"); 
00030     wait(3);
00031     
00032 }*/
00033 
00034 extern  ShortBeacy Shortbeacon;
00035 void writereg(uint8_t reg,uint8_t val)
00036 {
00037     cs_bar = 0;
00038     spi.write(reg | 0x80);      
00039     spi.write(val);
00040     cs_bar = 1;
00041 }
00042 uint8_t readreg(uint8_t reg)
00043 {
00044     uint8_t val;
00045     cs_bar = 0;
00046     spi.write(reg & ~0x80);        
00047     val = spi.write(0);
00048     cs_bar = 1;
00049     return val;
00050 }
00051         
00052 void FUNC_BEA() {
00053     
00054     //button.rise(&interrupt_func);         //interrupt enabled ( rising edge of pin 9)
00055     printf("\nBeacon function entered\n");
00056     wait(0.02);                             //takes 10 ms for POR event + 10ms for safety                 
00057     
00058     uint8_t byte_counter = 0;
00059     
00060     /*struct Short_beacon{
00061         uint8_t Voltage[1];
00062         uint8_t AngularSpeed[2];
00063         uint8_t SubsystemStatus[1];
00064         uint8_t Temp[3];
00065         uint8_t ErrorFlag[1];
00066         }Shortbeacon = { {0x22}, {0x22, 0x33} , {0x00},{0x00,0x00,0x00}, {0xFE} };
00067     */
00068     //filling hk data
00069     //ShortBeacon Shortbeacon;
00070     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]};
00071     
00072     //mask
00073     //uint8_t mask[] = {0x80, 0x40, 0x20,0x10,0x8,0x4,0x2,0x1};
00074         
00075     for(int i = 0; i < 15 ; i++)
00076     {
00077         chavan.printf("0x%X\n",(short_beacon[i]));    
00078     }
00079     
00080     spi.format(8,0);                    
00081     spi.frequency(10000000);             //10MHz SCLK frequency(its max for rfm69hcw)
00082     cs_bar = 1;                              // Chip must be deselected
00083     
00084     //initialization
00085     //Common configuration registers
00086     writereg(0x01,0x04);       //sequencer on,standby mode
00087     writereg(0x02,0x08);       //packet-mode used  , ook modultion , no dc-shaping
00088     writereg(0x03,0x68);       //1200bps datarate
00089     writereg(0x04,0x2B);       //1200bps datarate
00090     writereg(0x07,0x6C);       //Frequency MSB
00091     writereg(0x08,0xC0);       //Frequency MID
00092     writereg(0x09,0x00);       //Frequency LSB        ....6C C0 00 for 435 MHZ   
00093     
00094     //Transmitter registers
00095     // RegPaLevel(default +13 dBm)
00096     
00097     //IRQ and Pin Mapping Registers
00098     //no DIO mapped yet
00099     //regirq1(0x27): modeready (8th bit) will be checked for interrupts
00100     //regIrq2(0x28): fifothresh (5th bit) ,packetsent(3rd bit) will be checked for interrupts
00101     
00102     //Packet Engine Registers
00103     writereg(0x2C,0x00);        //set preamble
00104     writereg(0x2D,0x0A);        //set preamble
00105     writereg(0x2E,0x80);        //sync off        
00106     writereg(0x2F,0x5E);        //sync word 1               
00107     writereg(0x37,0x08 | 0x40);// | 0x10);        //packetconfig1, 0x40 for data whitening (only for testing)                
00108     writereg(0x38,0x00);        //payload length = 0 ... unlimited payload mode
00109     writereg(0x3C,0xB0);         //fifothresh = 48      because we want it cleared once its 40!!!!
00110     //Initialization complete
00111     
00112     //while(chavan.getc() == 't'){
00113     //t.start();  
00114     //Filling Data into FIFO 64 BYTES : eff.32 bits = 4bytes                  //fread
00115     cs_bar = 0; 
00116     spi.write(0x80);//fifo write access
00117     for(byte_counter=0 ; byte_counter<4; byte_counter++)
00118     {    
00119         for(int i=7; i>=0  ; i--)
00120         {
00121             if((short_beacon[byte_counter] & (uint8_t) pow(2.0,i))!=0)
00122             //if((short_beacon[byte_counter] & mask[i]) != 0)
00123             {
00124                 spi.write(0xFF);
00125                 spi.write(0xFF);
00126             }
00127     else
00128             {
00129                 spi.write(0x00);
00130                 spi.write(0x00);
00131             }
00132         }
00133     }
00134     cs_bar = 1; //cs_bar
00135                 
00136     //Check for fifoThresh
00137     printf("\nfor loop executed\n");
00138     while((readreg(0x28) & 0x20) != 0x20);                         
00139     printf("\nwhile loop executed\n");
00140     //Highpower settings
00141     writereg(0x11,0x7F);    //RegPalevel (20db)                //~
00142     writereg(0x13,0x0F);    //RegOCP
00143     writereg(0x5A,0x5D);    //RegTestPa1
00144     writereg(0x5C,0x7C);    //RegTestPa2
00145         
00146     //Set to Tx mode
00147     writereg(0x01,0x0C);
00148     
00149         printf("\npre 2nd while loop\n");
00150         //Check for fifoThresh
00151         while((readreg(0x28) & 0x20) != 0x00);  
00152         printf("\n2nd while loop executed\n");        
00153         while(byte_counter!=15){
00154             
00155         //writing again
00156         cs_bar = 0;
00157         spi.write(0x80);   
00158         for(int i=7; i>=0 ;i--)
00159         {
00160             if((short_beacon[byte_counter] & (uint8_t) pow(2.0,i))!=0)
00161             //if((short_beacon[byte_counter] & mask[i]) != 0)
00162         {
00163             spi.write(0xFF);
00164             spi.write(0xFF);
00165         }
00166         else
00167         {
00168             spi.write(0x00);
00169             spi.write(0x00);
00170         }
00171         }
00172         cs_bar = 1;
00173         byte_counter++;
00174                        
00175         //Check for fifoThresh
00176         while((readreg(0x28) & 0x20) != 0x00);
00177     }
00178     printf("\n3rd big while loop executed\n");
00179     //wait for packet sent bit to fire
00180     while((readreg(0x28) & 0x08) != 0x08);
00181     printf("\n4th while loop executed\n");
00182     //chavan.printf("packet sent!!! \n");    
00183     
00184     //Switch back to Standby Mode
00185     writereg(0x01,0x04);
00186     
00187     //Lowpowermode
00188     writereg(0x11,0x9F);    //RegPalevel (13db)
00189     writereg(0x13,0x1A);    //RegOCP
00190     writereg(0x5A,0x55);    //RegTestPa1(setting PA_BOOST on RFIO)
00191     writereg(0x5C,0x70);    //RegTestPa2(setting PA_BOOST on RFIO)
00192     
00193     //wait for modeready
00194     while((readreg(0x27)&0x80)!=0x80);
00195     
00196     //t.stop();
00197     //chavan.printf(" time taken to init + transmit = %f \n", t.read()) ;
00198     //}
00199 printf("\nBeacon function exiting\n");
00200 }