/*
* PCF8523 slightly changed its 7 bytes encoded in BCD:
* 03h - Seconds - 00-59
* 04h - Minutes - 00-59
* 05h - Hours - 00-23
* 06h - monthday - 01-31
* 07h - weekday - 00-06
* 08h - Month - 01-12
* 09h - Year - 00-99
*
*/
time_t rtc_readValue() {
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
ESP_ERROR_CHECK(i2c_master_start(cmd));
ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (RTC_ADDRESS << 1) | I2C_MASTER_WRITE, true /* expect ack */));
ESP_ERROR_CHECK(i2c_master_write_byte(cmd, 0x03, 1)); // start address
ESP_ERROR_CHECK(i2c_master_start(cmd));
ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (RTC_ADDRESS << 1) | I2C_MASTER_READ, true /* expect ack */));
uint8_t data[7];
ESP_ERROR_CHECK(i2c_master_read(cmd, data, 7, false));
ESP_ERROR_CHECK(i2c_master_stop(cmd));
COMMANDCHECKOKERR(i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000/portTICK_PERIOD_MS),"RTC COMMAND");
i2c_cmd_link_delete(cmd);
int i;
for (i=0; i<7; i++) {
ESP_LOGD(tag, "%d: 0x%.2x", i, data[i]);
}
struct tm tm;
tm.tm_sec = bcdToInt(data[0]);
tm.tm_min = bcdToInt(data[1]);
tm.tm_hour = bcdToInt(data[2]);
tm.tm_mday = bcdToInt(data[3]);
tm.tm_mon = bcdToInt(data[5]) - 1; // 0-11 - Note: The month on the PCF8523 is 1-12.
tm.tm_year = bcdToInt(data[6]) + 100; // Years since 1900
time_t readTime = mktime(&tm);
return readTime;
}
uint8_t DS3231::getTimeYear() {
prepRead(TIMEYEAR, 1);
return bcdToInt(Wire.read());
}
uint8_t DS3231::getTimeDate() {
prepRead(TIMEDATE, 1);
return bcdToInt(Wire.read());
}
uint8_t DS3231::getTimeMonth() {
prepRead(TIMECENTURYMONTH, 1);
// century bit is tied into month and should be ignored if set.
return Wire.peek() & 0x80 ? bcdToInt(Wire.read() & ~0x80) : bcdToInt(Wire.read());
}
uint8_t DS3231::getTimeDayOfTheWeek() {
prepRead(TIMEDAY, 1);
return bcdToInt(Wire.read());
}
bool DS3231::getTimeHoursIsPM() {
prepRead(TIMEHOUR, 1);
// if 12 hour bit 0x40 is set then return 0x20 AM/PM bit, else calculate AM/PM based off 24 hour clock
return Wire.peek() & 0x40 ? Wire.read() & 0x20 : bcdToInt(Wire.read()) > 12 ? true : false;
}
uint8_t DS3231::getTimeHours() {
prepRead(TIMEHOUR, 1);
// if 12 hour clock 0x40 bit is set then ignore 12 hour and BAM/PM 0x20 bit before returning
return Wire.peek() & 0x40 ? bcdToInt(Wire.read() & ~0x60) : bcdToInt(Wire.read());
}
uint8_t DS3231::getTimeMinutes() {
prepRead(TIMEMINUTE, 1);
return bcdToInt(Wire.read());
}
uint8_t DS3231::getTimeSeconds() {
prepRead(TIMESECOND, 1);
return bcdToInt(Wire.read());
}
