1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798 |
- #include "mbed.h"
- #include "main.h"
- #include "ds3231.h"
- InterruptIn IO_Rtc(PB_5);
- #define BCDToDecimal(x) (((x >> 4) * 10) + (x & 0xF))
- #define DecimalToBCD(x) (((x / 10) << 4) | (x % 10))
- void DS3231_Init(void (*Callback)()) {
- DS3231_REGS regs = {0};
- regs.Control_1.nEOSC = 0; // Enable internal oscillator on VBAT
- regs.Control_1.BBSQW = 0; // Disable outputs on VBAT
- regs.Control_1.RS1 = 0; // Set square wave output to 1Hz
- regs.Control_1.RS2 = 0; // Set square wave output tp 1Hz
- regs.Control_1.INTCN = 0; // Enable square wave output
- regs.Control_1.A1IE = 0; // Disable alarm 1
- regs.Control_1.A2IE = 0; // Disable alarm 2
- regs.Control_2.EN32KHZ = 0; // Disable 32kHz output
- I2C_Write(DS3231_ADDR, FIELD_OFFSET(DS3231_REGS, Control_1),
- regs.AS_BYTE + FIELD_OFFSET(DS3231_REGS, Control_1),
- FIELD_SIZE_THROUGH(DS3231_REGS, Control_1, Control_2));
- IO_Rtc.rise(Callback);
- }
- void DS3231_SetTime(int Second, int Minute, int Hour) {
- DS3231_REGS regs = {0};
- regs.Second.Value = DecimalToBCD(Second);
- regs.Minute.Value = DecimalToBCD(Minute);
- regs.Hour.Value = DecimalToBCD(Hour);
- regs.Hour.n24 = 0;
- I2C_Write(DS3231_ADDR, FIELD_OFFSET(DS3231_REGS, Second),
- regs.AS_BYTE + FIELD_OFFSET(DS3231_REGS, Second),
- FIELD_SIZE_THROUGH(DS3231_REGS, Second, Hour));
- }
- void DS3231_SetDate(int Day, int Date, int Month, int Year, int Century) {
- DS3231_REGS regs = {0};
- regs.DayOfWeek.Value = DecimalToBCD(Day);
- regs.Day.Value = DecimalToBCD(Date);
- regs.Month.Value = DecimalToBCD(Month);
- regs.Month.Century = DecimalToBCD(Century);
- regs.Year.Value = DecimalToBCD(Year);
- I2C_Write(DS3231_ADDR, FIELD_OFFSET(DS3231_REGS, Day),
- regs.AS_BYTE + FIELD_OFFSET(DS3231_REGS, Day),
- FIELD_SIZE_THROUGH(DS3231_REGS, Day, Year));
- }
- void DS3231_GetTime(int *Second, int *Minute, int *Hour) {
- DS3231_REGS regs = {0};
- I2C_Read(DS3231_ADDR, FIELD_OFFSET(DS3231_REGS, Second),
- regs.AS_BYTE + FIELD_OFFSET(DS3231_REGS, Second),
- FIELD_SIZE_THROUGH(DS3231_REGS, Second, Hour));
- *Second = BCDToDecimal(regs.Second.Value);
- *Minute = BCDToDecimal(regs.Minute.Value);
- *Hour = BCDToDecimal(regs.Hour.Value);
- }
- void DS3231_GetDate(int *Day, int *Date, int *Month, int *Year) {
- DS3231_REGS regs = {0};
- I2C_Read(DS3231_ADDR, FIELD_OFFSET(DS3231_REGS, Day),
- regs.AS_BYTE + FIELD_OFFSET(DS3231_REGS, Day),
- FIELD_SIZE_THROUGH(DS3231_REGS, Day, Year));
- *Day = BCDToDecimal(regs.DayOfWeek.Value);
- *Date = BCDToDecimal(regs.Day.Value);
- *Month = BCDToDecimal(regs.Month.Value);
- *Year = BCDToDecimal(regs.Year.Value);
- }
- bool IsDst(int DayOfWeek, int Day, int Month, int Hour_24) {
- // December through Feburary are always outside DST
- if (Month < 3 || Month > 11) return false;
- // April through October are always in DST
- if (Month > 3 && Month < 11) return true;
- int prevSunday = Day - DayOfWeek;
- // In March, in DST if previous sunday is between 8th and 14th
- if (Month == 3) {
- if (prevSunday < 8) return false;
- if (prevSunday > 14) return true;
- return (Day == prevSunday) ? Hour_24 >= 2 : true;
- }
- // In November, in DST if before the first Sunday
- if (prevSunday <= 0) return true;
- return (prevSunday == Day && Day <= 7) ? (Hour_24 < 2) : false;
- }
|