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PCF8563.c
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PCF8563.c
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/*
* PCF8563.c
*
* Created: 2014-11-18 20:00:32
* Author: Jakub Pachciarek
*
* Not implemented:
* - TEST1, STOP, TESTC, TI_TP bits - can be accessed trough raw PCF_Write and PCF_Read
*/
#include <avr/io.h>
#include "PCF8563.h"
//PHYSICAL LAYER
void TWI_Init()
{
//About 100kHz for 1.6MHz clock
TWBR = 0; //Set bitrate factor to 0
TWSR &= ~((1<<TWPS1) | (1<<TWPS0)); //Set prescaler to 1
}
void TWI_Start()
{
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
while (!(TWCR & (1<<TWINT)));
}
void TWI_Stop()
{
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
while ((TWCR & (1<<TWSTO)));
}
uint8_t TWI_Read(uint8_t ack)
{
TWCR = (1<<TWINT) | (1<<TWEN) | (((ack ? 1 : 0)<<TWEA));
while (!(TWCR & (1<<TWINT)));
return TWDR;
}
void TWI_Write(uint8_t byte)
{
TWDR = byte;
TWCR = (1<<TWINT) | (1<<TWEN);
while (!(TWCR & (1<<TWINT)));
}
//COMMUNICATION LAYER
void PCF_Write(uint8_t addr, uint8_t *data, uint8_t count) {
TWI_Start();
TWI_Write(PCF8563_WRITE_ADDR);
TWI_Write(addr);
while (count) {
count--;
TWI_Write(*data);
data++;
}
TWI_Stop();
}
void PCF_Read(uint8_t addr, uint8_t *data, uint8_t count) {
TWI_Start();
TWI_Write(PCF8563_WRITE_ADDR);
TWI_Write(addr);
TWI_Stop();
TWI_Start();
TWI_Write(PCF8563_READ_ADDR);
while (count)
{
count--;
*data = TWI_Read(count);
data++;
}
TWI_Stop();
}
//APPLICATION LAYER
//0 - 99 binary to BCD code conversion
#define BinToBCD(bin) ((((bin) / 10) << 4) + ((bin) % 10))
void PCF_Init(uint8_t mode)
{
TWI_Init();
uint8_t tmp = 0b00000000;
PCF_Write(0x00, &tmp, 1); //Control_status_1
mode &= 0b00010011; //Mask unnecessary bits
PCF_Write(0x01, &mode, 1); //Control_status_2
}
uint8_t PCF_GetAndClearFlags()
{
uint8_t flags;
PCF_Read(0x01, &flags, 1); //Control_status_2
uint8_t cleared = flags & 0b00010011; //Mask only configuration bits
PCF_Write(0x01, &cleared, 1); //Control_status_2
return flags & 0x0C; //Mask unnecessary bits
}
void PCF_SetClockOut(uint8_t mode)
{
mode &= 0b10000011;
PCF_Write(0x0D, &mode, 1); //CLKOUT_control
}
void PCF_SetTimer(uint8_t mode, uint8_t count)
{
mode &= 0b10000011;
PCF_Write(0x0E, &mode, 1); //Timer_control
PCF_Write(0x0F, &count, 1); //Timer
}
uint8_t PCF_GetTimer()
{
uint8_t count;
PCF_Read(0x0F, &count, 1); //Timer
return count;
}
uint8_t PCF_SetAlarm(PCF_Alarm *alarm)
{
if ((alarm->minute >= 60 && alarm->minute != 80) || (alarm->hour >= 24 && alarm->hour != 80) || (alarm->day > 32 && alarm->day != 80) || (alarm->weekday > 6 && alarm->weekday != 80))
{
return 1;
}
uint8_t buffer[4];
buffer[0] = BinToBCD(alarm->minute) & 0xFF;
buffer[1] = BinToBCD(alarm->hour) & 0xBF;
buffer[2] = BinToBCD(alarm->day) & 0xBF;
buffer[3] = BinToBCD(alarm->weekday) & 0x87;
PCF_Write(0x09, buffer, sizeof(buffer));
return 0;
}
uint8_t PCF_GetAlarm(PCF_Alarm *alarm)
{
uint8_t buffer[4];
PCF_Read(0x09, buffer, sizeof(buffer));
alarm->minute = (((buffer[0] >> 4) & 0x0F) * 10) + (buffer[0] & 0x0F);
alarm->hour = (((buffer[1] >> 4) & 0x0B) * 10) + (buffer[1] & 0x0F);
alarm->day = (((buffer[2] >> 4) & 0x0B) * 10) + (buffer[2] & 0x0F);
alarm->weekday = (((buffer[3] >> 4) & 0x08) * 10) + (buffer[3] & 0x07);
return 0;
}
uint8_t PCF_SetDateTime(PCF_DateTime *dateTime)
{
if (dateTime->second >= 60 || dateTime->minute >= 60 || dateTime->hour >= 24 || dateTime->day > 32 || dateTime->weekday > 6 || dateTime->month > 12 || dateTime->year < 1900 || dateTime->year >= 2100)
{
return 1;
}
uint8_t buffer[7];
buffer[0] = BinToBCD(dateTime->second) & 0x7F;
buffer[1] = BinToBCD(dateTime->minute) & 0x7F;
buffer[2] = BinToBCD(dateTime->hour) & 0x3F;
buffer[3] = BinToBCD(dateTime->day) & 0x3F;
buffer[4] = BinToBCD(dateTime->weekday) & 0x07;
buffer[5] = BinToBCD(dateTime->month) & 0x1F;
if (dateTime->year >= 2000)
{
buffer[5] |= 0x80;
buffer[6] = BinToBCD(dateTime->year - 2000);
}
else
{
buffer[6] = BinToBCD(dateTime->year - 1900);
}
PCF_Write(0x02, buffer, sizeof(buffer));
return 0;
}
uint8_t PCF_GetDateTime(PCF_DateTime *dateTime)
{
uint8_t buffer[7];
PCF_Read(0x02, buffer, sizeof(buffer));
dateTime->second = (((buffer[0] >> 4) & 0x07) * 10) + (buffer[0] & 0x0F);
dateTime->minute = (((buffer[1] >> 4) & 0x07) * 10) + (buffer[1] & 0x0F);
dateTime->hour = (((buffer[2] >> 4) & 0x03) * 10) + (buffer[2] & 0x0F);
dateTime->day = (((buffer[3] >> 4) & 0x03) * 10) + (buffer[3] & 0x0F);
dateTime->weekday = (buffer[4] & 0x07);
dateTime->month = ((buffer[5] >> 4) & 0x01) * 10 + (buffer[5] & 0x0F);
dateTime->year = 1900 + ((buffer[6] >> 4) & 0x0F) * 10 + (buffer[6] & 0x0F);
if (buffer[5] & 0x80)
{
dateTime->year += 100;
}
if (buffer[0] & 0x80) //Clock integrity not guaranted
{
return 1;
}
return 0;
}