Bonjour
Je cherche à utiliser une clock temps reelle : DS1307 avec un Pic pour passer un des ports du Pic à "1" ( RB0 par exemple ) lorsqu'une date et heure précise se présente.
Pourriez vous m'aider svp, je ne sais pas comment démarrer.
Je vous remercie beaucoup,
Code:#include <16F876a.h> #include <ds1307.h> #fuses NOWDT,XT, PUT, NOPROTECT, BROWNOUT ,NODEBUG ,NOLVP #use delay(clock=4000000) #use rs232(baud=9600,parity=N,xmit=PIN_A0,rcv=PIN_A1,bits=8) #zero_ram int DATE,MTH,YR,HR,MT,SECDS,DOW; // void main() { setup_adc_ports(NO_ANALOGS); setup_adc(ADC_OFF); setup_spi(FALSE); setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1); setup_comparator(NC_NC_NC_NC); setup_vref(FALSE); ds1307_init(); while(1){ ds1307_get_time(HR,MT,SECDS); ds1307_get_date(DATE,MTH,YR,DOW); printf("\rTime %2D:%02D:%02D",HR,MT,SECDS); printf(" Date %2D/%02D/%02D",DATE,MTH,YR); delay_ms(100); if(!input(PIN_C0 )) ds1307_set_date_time(28,1,8,2,11,50,0); // Time 11:50:00 Date 28/01/08 } } __________________________________________________ DS1307.C Code: ////////////////////////////////////////////////////////////////////////////////// /// DS1307.C /// /// Driver for Real Time Clock /// /// /// /// ds1307_init() - Enable oscillator without clearing the seconds register -/// /// used when PIC loses power and DS1307 run from 3V BAT /// /// - Disable squarewave output /// /// /// /// ds1307_set_date_time(day,mth,year,dow,hour,min,sec) Set the date/time /// /// /// /// ds1307_get_date(day,mth,year,dow) Get the date /// /// /// /// ds1307_get_time(hr,min,sec) Get the time /// /// /// //////////////////////////////////////////////////////////////////////////////// #use delay(clock=4000000) #define RTC_SDA PIN_C4 #define RTC_SCL PIN_C3 #use i2c(master, sda=RTC_SDA, scl=RTC_SCL) BYTE bin2bcd(BYTE binary_value); BYTE bcd2bin(BYTE bcd_value); void ds1307_init(void) { BYTE seconds = 0; i2c_start(); i2c_write(0xD0); // WR to RTC i2c_write(0x00); // REG 0 i2c_start(); i2c_write(0xD1); // RD from RTC seconds = bcd2bin(i2c_read(0)); // Read current "seconds" in DS1307 i2c_stop(); seconds &= 0x7F; delay_us(3); i2c_start(); i2c_write(0xD0); // WR to RTC i2c_write(0x00); // REG 0 i2c_write(bin2bcd(seconds)); // Start oscillator with current "seconds value i2c_start(); i2c_write(0xD0); // WR to RTC i2c_write(0x07); // Control Register i2c_write(0x80); // Disable squarewave output pin i2c_stop(); } void ds1307_set_date_time(BYTE day, BYTE mth, BYTE year, BYTE dow, BYTE hr, BYTE min, BYTE sec) { sec &= 0x7F; hr &= 0x3F; i2c_start(); i2c_write(0xD0); // I2C write address i2c_write(0x00); // Start at REG 0 - Seconds i2c_write(bin2bcd(sec)); // REG 0 i2c_write(bin2bcd(min)); // REG 1 i2c_write(bin2bcd(hr)); // REG 2 i2c_write(bin2bcd(dow)); // REG 3 i2c_write(bin2bcd(day)); // REG 4 i2c_write(bin2bcd(mth)); // REG 5 i2c_write(bin2bcd(year)); // REG 6 i2c_write(0x80); // REG 7 - Disable squarewave output pin i2c_stop(); } void ds1307_get_date(BYTE &day, BYTE &mth, BYTE &year, BYTE &dow) { i2c_start(); i2c_write(0xD0); i2c_write(0x03); // Start at REG 3 - Day of week i2c_start(); i2c_write(0xD1); dow = bcd2bin(i2c_read() & 0x7f); // REG 3 day = bcd2bin(i2c_read() & 0x3f); // REG 4 mth = bcd2bin(i2c_read() & 0x1f); // REG 5 year = bcd2bin(i2c_read(0)); // REG 6 i2c_stop(); } void ds1307_get_time(BYTE &hr, BYTE &min, BYTE &sec) { i2c_start(); i2c_write(0xD0); i2c_write(0x00); // Start at REG 0 - Seconds i2c_start(); i2c_write(0xD1); sec = bcd2bin(i2c_read() & 0x7f); min = bcd2bin(i2c_read() & 0x7f); hr = bcd2bin(i2c_read(0) & 0x3f); i2c_stop(); } BYTE bin2bcd(BYTE binary_value) { BYTE temp; BYTE retval; temp = binary_value; retval = 0; while(1) { // Get the tens digit by doing multiple subtraction // of 10 from the binary value. if(temp >= 10) { temp -= 10; retval += 0x10; } else // Get the ones digit by adding the remainder. { retval += temp; break; } } return(retval); } // Input range - 00 to 99. BYTE bcd2bin(BYTE bcd_value) { BYTE temp; temp = bcd_value; // Shifting upper digit right by 1 is same as multiplying by 8. temp >>= 1; // Isolate the bits for the upper digit. temp &= 0x78; // Now return: (Tens * 8) + (Tens * 2) + Ones return(temp + (temp >> 2) + (bcd_value & 0x0f)); }
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