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- /*
- ds3231 support module
-
- Copyright (C) 2018 by Pavel Chauzov <poulch at mail dot ru>
-
- */
- #pragma once
-
- #undef I2C_SUPPORT
- #define I2C_SUPPORT 1 // Explicitly request I2C support.
-
- #include <TimeLib.h>
-
-
- #define DS3231ADDR 0x68
-
- #define _bcdToDec(val) ((uint8_t) ((val / 16 * 10) + (val % 16)))
- #define _decToBcd(val) ((uint8_t) ((val / 10 * 16) + (val % 10)))
-
- time_t getTime_rtc() {
- uint8_t data[7];
- tmElements_t tm;
-
- i2c_write_uint8(DS3231ADDR,0);
- i2c_read_buffer(DS3231ADDR, data, 7);
- tm.Second = _bcdToDec(data[0]);
- tm.Minute = _bcdToDec(data[1]);
- tm.Hour = _bcdToDec(data[2]);
- tm.Wday = _bcdToDec(data[3]);
- tm.Day = _bcdToDec(data[4]);
- tm.Month = _bcdToDec(data[5]);
- tm.Year = y2kYearToTm(_bcdToDec(data[6]));
-
- return makeTime(tm);
- }
-
- uint8_t setTime_rtc(time_t nt) {
- uint8_t data[8];
- tmElements_t ct;
- breakTime(nt, ct);
-
- data[0] = 0;
- data[1] = _decToBcd(ct.Second);
- data[2] = _decToBcd(ct.Minute);
- data[3] = _decToBcd(ct.Hour);
- data[4] = _decToBcd(ct.Wday);
- data[5] = _decToBcd(ct.Day);
- data[6] = _decToBcd(ct.Month);
- data[7] = _decToBcd(tmYearToY2k(ct.Year));
- uint8_t s = i2c_write_buffer(DS3231ADDR, data, 8);
- return s;
- }
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