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/*
* File: Header file to use DS3231 RTC module with PIC16F877A
* Author: B.Aswinth Raj
* Created on 5 May, 2018, 10:06 PM
* Connect the RTC module to SDA and SCK pins of the PIC.
* This header needs the PIC16f877a_I2C.h header to compile
*/
//PIN 18 -> RC3 -> SCL
//PIN 23 -> RC4 ->SDA
/****** Functions for RTC module *******/
#include "ds3231.h"
#include "i2c.h"
#include "main.h"
int BCD_2_DEC(int to_convert) {
return (to_convert >> 4) * 10 + (to_convert & 0x0F);
}
int DEC_2_BCD(int to_convert) {
return ((to_convert / 10) << 4) + (to_convert % 10);
}
unsigned int Get_DayOfWeek(unsigned int y, unsigned int m, unsigned int d) {
return (d += m < 3 ? y-- : y - 2, 23*m/9 + d + 4 + y/4- y/100 + y/400)%7 + 1; // 01 - 07, 01 = Sunday
}
void Read_Alarms_Temp() {
I2C_Master_Start(); // Start I2C
I2C_Master_Write(0xD0); // RTC chip address
I2C_Master_Write(0x07); // (alarm1 seconds register)
I2C_Master_Repeated_Start(); // Restart I2C
//READ
I2C_Master_Write(0xD1); // Initialize data read
alarm1_sec = BCD_2_DEC(I2C_Master_Read(1)); // Read alarm1 seconds 07h
alarm1_min = BCD_2_DEC(I2C_Master_Read(1)); // Read alarm1 minutes 08h
alarm1_hour = BCD_2_DEC(I2C_Master_Read(1)); // Read alarm1 hours 09h
I2C_Master_Read(1); // skip alarm1 day/date 0Ah
alarm2_min = BCD_2_DEC(I2C_Master_Read(1)); // Read alarm2 minutes 0Bh
alarm2_hour = BCD_2_DEC(I2C_Master_Read(1)); // Read alarm2 hours 0Ch
I2C_Master_Read(1); // Skip alarm2 day/date 0Dh
control_reg = I2C_Master_Read(1); // Read control register 0Eh
status_reg = I2C_Master_Read(1); // Read status register 0Fh
I2C_Master_Read(1); // Skip aging offset register
temperature_msb = I2C_Master_Read(1); // Read temperature MSB 011h
temperature_lsb = I2C_Master_Read(0); // Read temperature LSB 012h
I2C_Master_Stop();
}
void Set_Date() {
I2C_Master_Start(); // Start I2C
I2C_Master_Write(0xD0); // RTC Chip address
I2C_Master_Write(4); // send register address
I2C_Master_Write(DEC_2_BCD(date)); //update date
I2C_Master_Write(DEC_2_BCD(month)); //update month
I2C_Master_Write(DEC_2_BCD(year)); //update year
I2C_Master_Stop();
}
void Set_DayOfWeek(int dow) {
I2C_Master_Start(); // Start I2C
I2C_Master_Write(0xD0); // RTC Chip address
I2C_Master_Write(3); // send register address
I2C_Master_Write(dow); //update day of week
I2C_Master_Stop();
}
void Set_Time() {
I2C_Master_Start(); // Start I2C
I2C_Master_Write(0xD0); // RTC Chip address
I2C_Master_Write(0); // send register address
I2C_Master_Write(DEC_2_BCD(sec)); //update sec
I2C_Master_Write(DEC_2_BCD(min)); //update min
I2C_Master_Write(DEC_2_BCD(hour)); //update hour
I2C_Master_Stop();
}
void Update_Current_Date_Time() {
//START to Read
I2C_Master_Start();
I2C_Master_Write(0xD0); // RTC Chip address
I2C_Master_Write(0);
I2C_Master_Repeated_Start(); // Restart I2C
//READ
I2C_Master_Write(0xD1); // Initialize data read
sec = BCD_2_DEC(I2C_Master_Read(1)); // Read sec from register 00h
min = BCD_2_DEC(I2C_Master_Read(1)); // Read min from register 01h
hour = BCD_2_DEC(I2C_Master_Read(1)); // Read hour from register 02h
day = I2C_Master_Read(1); // Read day from register 03h
date = BCD_2_DEC(I2C_Master_Read(1)); // Read date from register 04h
month = BCD_2_DEC(I2C_Master_Read(1)); // Read month from register 05h
year = BCD_2_DEC(I2C_Master_Read(1)); // Read year from register 06h
I2C_Master_Stop();
//END Reading
I2C_Master_Start();
I2C_Master_Write(0xD1);
I2C_Master_Read(1);
I2C_Master_Stop();
}
void Write_Alarms() {
I2C_Master_Start(); // Start I2C
I2C_Master_Write(0xD0); // RTC Chip Address
I2C_Master_Write(7); // Send Alarm1 register address
I2C_Master_Write(0); // Write 0 to Alarm1 seconds
I2C_Master_Write(DEC_2_BCD(alarm1_min)); // Write Alarm1 minutes
I2C_Master_Write(DEC_2_BCD(alarm1_hour)); // Write Alarm1 hours
I2C_Master_Write(0x80); // Alarm1 when H:M:S matches
I2C_Master_Write(DEC_2_BCD(alarm2_min)); // Write Alarm2 minutes
I2C_Master_Write(DEC_2_BCD(alarm2_hour)); // Write Alarm2 hours
I2C_Master_Write(0x80); // Alarm2 when H:M:S matches
//Write data to control register (enable interupt when alarm);
I2C_Master_Write(4 | alarm1_status | (alarm2_status << 1));
I2C_Master_Write(0); // Clear alarm flag bits
I2C_Master_Stop(); // Stop I2C
__delay_ms(200); // Wait 200ms
}
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