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