SimpleNixieClock/src/ds3231.c

#include "ds3231.h"
#include "i2c.h"

/**
 * @brief Инициализация RTC
 */
void RTC_Init(void) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_CONTROL_ADDR);
  I2C_WriteByte(DS3231_CONV);
  I2C_Stop();
}

/**
 * @brief Чтение времени и календаря
 */
void RTC_ReadAll(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_TIME_CAL_ADDR);
  I2C_Stop();

  I2C_Start();
  I2C_WriteByte(DS3231_I2C_RDADDR);
  I2C_ReadByte(&data->Sec, TWI_ACK);
  I2C_ReadByte(&data->Min, TWI_ACK);
  I2C_ReadByte(&data->Hr, TWI_ACK);
  I2C_ReadByte(&data->WD, TWI_ACK);
  I2C_ReadByte(&data->Day, TWI_ACK);
  I2C_ReadByte(&data->Mon, TWI_ACK);
  I2C_ReadByte(&data->Year, TWI_NACK);
  I2C_Stop();
}

/**
 * @brief Чтение времени
 */
void RTC_ReadTime(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_TIME_CAL_ADDR);
  I2C_Stop();

  I2C_Start();
  I2C_WriteByte(DS3231_I2C_RDADDR);
  I2C_ReadByte(&data->Sec, TWI_ACK);
  I2C_ReadByte(&data->Min, TWI_ACK);
  I2C_ReadByte(&data->Hr, TWI_NACK);
  I2C_Stop();
}

/**
 * @brief Чтение календаря
 */
void RTC_ReadCalendar(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_CALENDAR_ADDR);
  I2C_Stop();

  I2C_Start();
  I2C_WriteByte(DS3231_I2C_RDADDR);
  I2C_ReadByte(&data->WD, TWI_ACK);
  I2C_ReadByte(&data->Day, TWI_ACK);
  I2C_ReadByte(&data->Mon, TWI_ACK);
  I2C_ReadByte(&data->Year, TWI_NACK);
  I2C_Stop();
}

/**
 * @brief Запись времени и календаря
 */
void RTC_WriteAll(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_TIME_CAL_ADDR);
  I2C_WriteByte(data->Sec);
  I2C_WriteByte(data->Min);
  I2C_WriteByte(data->Hr);
  I2C_WriteByte(data->WD);
  I2C_WriteByte(data->Day);
  I2C_WriteByte(data->Mon);
  I2C_WriteByte(data->Year);
  I2C_Stop();
}

/**
 * @brief Запись времени
 */
void RTC_WriteTime(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_TIME_CAL_ADDR);
  I2C_WriteByte(data->Sec);
  I2C_WriteByte(data->Min);
  I2C_WriteByte(data->Hr);
  I2C_Stop();
}

/**
 * @brief Запись часов
 */
void RTC_WriteHH(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_TIME_CAL_ADDR + 2);
  I2C_WriteByte(data->Hr);
  I2C_Stop();
}

/**
 * @brief Запись часов и минут
 */
void RTC_WriteHHMM(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_TIME_CAL_ADDR + 1);
  I2C_WriteByte(data->Min);
  I2C_WriteByte(data->Hr);
  I2C_Stop();
}

/**
 * @brief Запись календаря
 */
void RTC_WriteCalendar(rtc_t * data) {
  I2C_Start();
  I2C_WriteByte(DS3231_I2C_WRADDR);
  I2C_WriteByte(DS3231_CALENDAR_ADDR);
  I2C_WriteByte(data->WD);
  I2C_WriteByte(data->Day);
  I2C_WriteByte(data->Mon);
  I2C_WriteByte(data->Year);
  I2C_Stop();
}

/**
 * @brief Convert BCD value to Binary
 */
uint8_t bcd2bin(uint8_t bcd)
{
    return (10 * (bcd >> 4) + (bcd & 0x0f));
}

/**
 * @brief Convert Binary value to BCD
 */
uint8_t bin2bcd(uint8_t bin)
{
    return (((bin / 10 ) << 4) | (bin % 10));
}