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| #include "defines.h" |
| #include "DS3231.h" |
| #include "I2C1.h" |
| |
| void DS3231_Init() { |
| uint8_t reg[3]; |
| reg[0] = DS3231_CONTROL; |
| |
| /* Control Register (0x0E) |
| * Bit 7 - !EOSC |
| * Bit 6 - BBSQW |
| * Bit 5 - CONV |
| * Bit 4 - RS2 |
| * Bit 3 - RS1 |
| * Bit 2 - INTCN |
| * Bit 1 - A2IE |
| * Bit 0 - A1IE |
| */ |
| reg[1] = 0x04; |
| |
| /* Control Register 2 (0x0F) |
| * Bit 3 = EN32kHZ |
| */ |
| reg[2] = 0x00; |
| |
| // Set the configuration registers |
| I2C1_Master_Send(DS3231_ADDRESS, 3, reg); |
| while (!I2C1_Get_Status()); |
| } |
| |
| uint8_t DS3231_Get_Status(void) { |
| /* Status Register (0x0F) |
| * Bit 7 - OSF |
| * Bit 3 - EN32kHz |
| * Bit 2 - BSY |
| * Bit 1 - A2F |
| * Bit 0 - A1F |
| */ |
| uint8_t value; |
| I2C1_Master_Restart(DS3231_ADDRESS, 0x0F, 1); |
| while (!I2C1_Get_Status()); |
| I2C1_Read_Buffer(&value); |
| return value; |
| } |
| |
| void DS3231_Set_Time(DS3231_TIME *time) { |
| |
| // Format the data in a way that the chip expects |
| #ifndef DS3231_TIME_ONLY |
| uint8_t output[8]; |
| #else |
| uint8_t output[4]; |
| #endif |
| output[0] = DS3231_SECONDS; |
| output[1] = ((time->sec / 10) << 4) | (time->sec % 10); |
| output[2] = ((time->min / 10) << 4) | (time->min % 10); |
| output[3] = ((time->hour / 10) << 4) | (time->hour % 10); |
| #ifndef DS3231_TIME_ONLY |
| if (!time->h_mil) { |
| output[3] |= (time->h_am_pm) ? 0x60 : 0x40; |
| } |
| output[4] = time->day; |
| output[5] = ((time->date / 10) << 4) | (time->date % 10); |
| output[6] = ((time->month / 10) << 4) | (time->month % 10); |
| output[7] = ((time->year / 10) << 4) | (time->year % 10); |
| #endif |
| |
| // Check the status to make sure that it isnt currently busy |
| while (DS3231_Get_Status() & 0x04); |
| |
| // Write the data to the chip |
| #ifndef DS3231_TIME_ONLY |
| I2C1_Master_Send(DS3231_ADDRESS, 8, output); |
| #else |
| I2C1_Master_Send(DS3231_ADDRESS, 4, output); |
| #endif |
| while (!I2C1_Get_Status()); |
| } |
| |
| void DS3231_Get_Time(DS3231_TIME *time) { |
| |
| // Check the status to make sure that it isnt currently busy |
| while (DS3231_Get_Status() & 0x04); |
| |
| // Request time data from the chip |
| #ifndef DS3231_TIME_ONLY |
| uint8_t input[7]; |
| I2C1_Master_Restart(DS3231_ADDRESS, 0x00, 7); |
| #else |
| uint8_t input[3]; |
| I2C1_Master_Restart(DS3231_ADDRESS, 0x00, 3); |
| #endif |
| while (!I2C1_Get_Status()); |
| I2C1_Read_Buffer(input); |
| |
| // Parse BCD format into decimal and return |
| time->sec = ((input[0] >> 4) * 10) + (input[0] & 0x0F); |
| time->min = ((input[1] >> 4) * 10) + (input[1] & 0x0F); |
| if (input[2] & 0x40) { |
| time->h_mil = 0; |
| time->h_am_pm = (input[2] & 0x20) ? 1 : 0; |
| time->hour = (((input[2] >> 4) & 0x01) * 10) + (input[2] & 0x0F); |
| } else { |
| time->h_mil = 1; |
| time->hour = ((input[2] >> 4) * 10) + (input[2] & 0x0F); |
| } |
| #ifndef DS3231_TIME_ONLY |
| time->day = input[3]; |
| time->date = ((input[4] >> 4) * 10) + (input[4] & 0x0F); |
| time->month = ((input[5] >> 4) * 10) + (input[5] & 0x0F); |
| time->year = ((input[6] >> 4) * 10) + (input[6] & 0x0F); |
| #endif |
| } |