Definition in file RTC.h.
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| void | RTC_init (void) |
| Start Timer/Counter2 in asynchronous operation using a 32.768kHz crystal. | |
| void | Time_update (void) |
| Updates the time and date variables. | |
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Start Timer/Counter2 in asynchronous operation using a 32.768kHz crystal.
Definition at line 35 of file RTC.c. References DAY, Delay(), HOUR, MINUTE, MONTH, SECOND, YEAR_HI, and YEAR_LO. Referenced by Initialization(). 00036 { 00037 Delay(1000); // wait for 1 sec to let the Xtal stabilize after a power-on, 00038 00039 __disable_interrupt(); // disabel global interrupt 00040 00041 TIMSK2 = 0; // disable OCIE2A and TOIE2 00042 00043 ASSR = (1<<AS2); // select asynchronous operation of Timer2 00044 00045 TCNT2 = 0; // clear TCNT2A 00046 TCCR2A = (1<<CS22) | (1<<CS20); // select precaler: 32.768 kHz / 128 = 1 sec between each overflow 00047 00048 while(ASSR & (0x01 | 0x04)); // wait for TCN2UB and TCR2UB to be cleared 00049 00050 TIFR2 = 0xFF; // clear interrupt-flags 00051 TIMSK2 = (1<<TOIE2); // enable Timer2 overflow interrupt 00052 00053 __enable_interrupt(); // enable global interrupt 00054 00055 // initial time and date setting 00056 HOUR = 8; 00057 MINUTE = 0; 00058 SECOND = 0; 00059 DAY = 4; 00060 MONTH = 11; 00061 YEAR_LO = 2; 00062 YEAR_HI = 20; 00063 }
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Updates the time and date variables.
Definition at line 68 of file RTC.c. References DAY, FALSE, HOUR, MaxDate, MINUTE, MONTH, SECOND, TRUE, YEAR_HI, and YEAR_LO. Referenced by main(). 00069 { 00070 unsigned char LeapYear = FALSE; 00071 00072 //the variable SECOND gets updated in the Timer0 Overflow Interrupt Routine every second 00073 00074 if(SECOND > 59) // if one minute 00075 { 00076 SECOND = 0; // clear SECOND 00077 MINUTE++; // increment MINUTE 00078 00079 if(MINUTE > 59) // if one hour 00080 { 00081 MINUTE = 0; // clear MINUTE 00082 HOUR++; // increment HOUR 00083 00084 if(HOUR > 23) // if one hour 00085 { 00086 HOUR = 0; // clear HOUR 00087 DAY++; // increment DAY 00088 00089 if(MONTH == 2) // if it's February 00090 { 00091 // check for leap year 00092 if(!YEAR_LO) // if YEAR_LO = 0, (a century has passed) 00093 { 00094 if(!(YEAR_HI%4)) // check if YEAR_HI is divisible by 4 00095 LeapYear = TRUE; // then it is a leap year 00096 } 00097 else if(!(YEAR_LO%4) & (YEAR_LO != 0)) // else if YEAR_LO is divisible by 4 and not zero 00098 LeapYear = TRUE; // then it's a leap year 00099 } 00100 00101 if(DAY > (MaxDate[MONTH] + LeapYear)) // if a whole month has passed 00102 { 00103 DAY = 1; // clear DAY 00104 MONTH++; // increment MONTH 00105 00106 if(MONTH > 12) // if one year 00107 { 00108 MONTH = 1; // clear MONTH 00109 YEAR_LO++; // increment YEAR_LO 00110 00111 if(YEAR_LO > 99) // if one century 00112 { 00113 YEAR_LO = 0; // clear YEAR_LO 00114 YEAR_HI++; // increment YEAR_HI 00115 00116 if(YEAR_HI > 99) // if 100 centuries 00117 YEAR_HI = 0; // the AVR is still going strong :) 00118 } 00119 } 00120 } 00121 } 00122 } 00123 } 00124 }
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1.4.5