cdms_rtc.h

00001 void FCTN_CDMS_INIT_RTC()
00002 {
00003     SPI_mutex.lock();
00004     gCS_RTC=1;
00005     spi.format(8,0);
00006     spi.frequency(1000000);
00007     //clearing the halt bit 
00008     gCS_RTC=1;
00009     gCS_RTC=0;
00010     spi.write(0x8C);
00011     spi.write(0x00);
00012      
00013     //clearing the OF bit 
00014     gCS_RTC=1;
00015     gCS_RTC=0;
00016     spi.write(0x8F);
00017     spi.write(0x00);
00018      
00019     //century bits
00020     gCS_RTC=1;
00021     gCS_RTC=0;
00022     spi.write(0x80|0x03);
00023     spi.write(0x00);
00024  
00025     //Kick starting the oscillator 
00026     gCS_RTC=1;
00027     gCS_RTC=0;
00028     spi.write(0x81); //register address with write flag
00029     spi.write(0x80);//enabling stop bit in the seconds register
00030  
00031     gCS_RTC=1;
00032     gCS_RTC=0;
00033     spi.write(0x81);
00034     spi.write(0x00);//disabling the stop bit to restart the oscillator 
00035  
00036     
00037     gCS_RTC=1;
00038     gCS_RTC=0;
00039     spi.write(0x80); 
00040     spi.write(0x01); // set milliseconds value to 00
00041     gCS_RTC=1;
00042  
00043     gCS_RTC=0;
00044     spi.write(0x81); 
00045     spi.write(0x01); //set seconds value to 00
00046     gCS_RTC=1;
00047  
00048     gCS_RTC=0;
00049     spi.write(0x82); 
00050     spi.write(0x01);//set minutes value to 00
00051     gCS_RTC=1;
00052  
00053     gCS_RTC=0;
00054     spi.write(0x83); 
00055     spi.write(0x23); //set the hours to 01
00056     gCS_RTC=1;
00057     
00058     gCS_RTC=0;
00059     spi.write(0x84); 
00060     spi.write(0x01); //set day of the week to 01
00061     gCS_RTC=1;
00062     
00063     gCS_RTC=0;
00064     spi.write(0x85); 
00065     spi.write(0x31); //set date of the month to 01
00066     gCS_RTC=1;
00067     
00068     gCS_RTC=0;
00069     spi.write(0x86); 
00070     spi.write(0x12); //set month to 01
00071     gCS_RTC=1;
00072     
00073     gCS_RTC=0;
00074     spi.write(0x87); 
00075     spi.write(0x01); //set year to 00(2000)
00076     gCS_RTC=1;
00077 //    printf("\n\r rtc initalised \n");
00078     SPI_mutex.unlock();
00079 }
00080  
00081 uint64_t FCTN_CDMS_RD_RTC()
00082 {    
00083     SPI_mutex.lock();
00084     uint8_t response;
00085     //printf("\n\r Entered rtc\n");
00086     gCS_RTC=1;
00087     gCS_RTC=0;
00088     spi.write(0x00); //reading milliseconds register
00089     response = spi.write(0x00); // read the value by sending dummy byte
00090     uint8_t centiseconds =  (uint8_t(response&0xF0)>>4)*10+uint8_t(response&0x0F)*1;
00091     
00092     gCS_RTC=1;
00093     gCS_RTC=0;
00094     spi.write(0x01); //reading seconds register
00095     response =spi.write(0x01);
00096     uint8_t seconds =  ((response&0x70)>>4)*10+(response&0x0F)*1;
00097     
00098     gCS_RTC=1;
00099     gCS_RTC=0;
00100     spi.write(0x02); //reading minutes register
00101     response =spi.write(0x01);
00102     uint8_t minutes =  ((response&0xF0)>>4)*10+(response&0x0F)*1;
00103     
00104     gCS_RTC=1;
00105     gCS_RTC=0;
00106     spi.write(0x03); //reading hours register
00107     response=spi.write(0x01);
00108     uint8_t hours =  ((response&0x30)>>4)*10+(response&0x0F)*1;
00109     
00110     gCS_RTC=1;
00111     gCS_RTC=0;
00112     spi.write(0x04); //reading day's  register
00113     uint8_t day =spi.write(0x01);
00114     
00115     gCS_RTC=1;
00116     gCS_RTC=0;
00117     spi.write(0x05); //reading date register
00118     response =spi.write(0x01);
00119     uint8_t date =  ((response&0x30)>>4)*10+(response&0x0F)*1;
00120     
00121     gCS_RTC=1;
00122     gCS_RTC=0;
00123     spi.write(0x06); //reading month registe
00124     response =spi.write(0x01);
00125     uint8_t month =  ((response&0x10)>>4)*10+(response&0x0F)*1;
00126     
00127     gCS_RTC=1;
00128     gCS_RTC=0;
00129     spi.write(0x07); //reading year's registe
00130     response =spi.write(0x01);
00131     uint8_t year =  ((response&0xF0)>>4)*10+(response&0x0F)*1;
00132     gCS_RTC=1;
00133     //sprintf(Time_stamp,"%02d%02d%02d%02d%02d%02d%02d%02d",year, month, date, day, hours, minutes, seconds, milliseconds );
00134     uint8_t Time_stamp[8] = {year, month, date, day, hours, minutes, seconds, centiseconds};
00135     for(int i= 0; i<8;i++);
00136         //printf("%d\t",Time_stamp[i]);
00137     //printf("read\r\n");
00138     uint64_t time;
00139     time = 0;
00140     time = time|(((uint64_t)(centiseconds&0x7F)));
00141     time = time|(((uint64_t)(seconds&0x3F))<<7);
00142     time = time|(((uint64_t)(minutes&0x3F))<<13);
00143     time = time|(((uint64_t)(hours&0x1F))<<19);
00144     time = time|(((uint64_t)(day&0x1F))<<24);
00145     time = time|(((uint64_t)(month&0x07))<<29);
00146     time = time|(((uint64_t)(year&0x03))<<33);
00147     time = (time&0x00000007FFFFFFFF);
00148     //printf("\n\r%x%x", (int)(time >> 32), (int)(time));
00149     //printf("\n\r0x%016llx\n\r", time);
00150    return time;
00151    SPI_mutex.unlock();
00152 }