File content as of revision 1:bcea5c3f58f4:

#include "mbed.h"
#include "PCF8563.h"

extern Serial usart2;

PCF8563::PCF8563(PinName sda, PinName scl) : pcf8563_i2c (sda, scl)
{
    pcf8563_i2c.frequency(PCF8563_FREQ);
}

time_t PCF8563::now()
{
    struct tm now;
    char start = 0x02;
    char buffer[7];
    
    if(pcf8563_i2c.write(W8563_ADDR, &start, 1) != 0) return 0;
    if(pcf8563_i2c.read(R8563_ADDR, buffer, 7) != 0) return 0;
    
    now.tm_sec = bcdToDecimal(buffer[0] & 0x7F);
    now.tm_min = bcdToDecimal(buffer[1] & 0x7F);
    now.tm_hour = bcdToDecimal(buffer[2] & 0x3F);
    now.tm_mday = bcdToDecimal(buffer[3] & 0x3F);
    now.tm_mon = bcdToDecimal(buffer[5] & 0x1F) - 1;
    now.tm_year = bcdToDecimal(buffer[6]) + 2000 - 1900;
    
    return mktime(&now);
}

bool PCF8563::set_time(time_t time)
{
    struct tm *now;
    char buffer[8];
    
    now = localtime(&time);
    
    buffer[0] = 0x02; // memory address
    buffer[1] = decimalToBcd(now->tm_sec) & 0x7F; // VL = 0
    buffer[2] = decimalToBcd(now->tm_min) & 0x7F;
    buffer[3] = decimalToBcd(now->tm_hour) & 0x3F;
    buffer[4] = now->tm_wday + 1;
    buffer[5] = decimalToBcd(now->tm_mday) & 0x3F;
    buffer[6] = decimalToBcd(now->tm_mon+1) & 0x1F;
    buffer[7] = decimalToBcd(now->tm_year + 1900 - 2000);
    
    if(pcf8563_i2c.write(W8563_ADDR, buffer, 9) != 0) return 0;
    
    return true;
}

bool PCF8563::set_alarm(time_t time)
{
    struct tm *now;
    char buffer[5];
    
    now = localtime(&time);
    
    buffer[0] = 0x09; // memory address
    buffer[1] = decimalToBcd(now->tm_min) & 0x80;
    buffer[2] = decimalToBcd(now->tm_hour) & 0x80;
    buffer[3] = decimalToBcd(now->tm_mday) & 0x80;
    buffer[4] = (now->tm_wday + 1) & 0x80;
    if(pcf8563_i2c.write(W8563_ADDR, buffer, 4) != 0) return 0;
    
    char Int[2];
    Int[0] = 0x01; // control address
    Int[1] = 0x02; // set AIE to 1 for INT pin
    if(pcf8563_i2c.write(W8563_ADDR, Int, 2) != 0) return 0;
    
    return true;
}

bool PCF8563::alarmOff()
{
    char start = 0x01;
    char buffer;
    
    if(pcf8563_i2c.write(W8563_ADDR, &start, 1) != 0) return 0;
    //if(pcf8563_i2c.read(R8563_ADDR, buffer, 1) != 0) return 0;
    
    pcf8563_i2c.start();
    pcf8563_i2c.write(R8563_ADDR);
    buffer = pcf8563_i2c.read(0);
    pcf8563_i2c.stop();
    
    buffer = buffer - 0x08; // clear AF to turn off alarm
    
    char send[2];
    send[0] = 0x01; //control 1 address
    send[1] = buffer;
    if(pcf8563_i2c.write(W8563_ADDR, send, 2) != 0) return 0;
    
    return true;
}

bool PCF8563::check_alarm()
{
    char start = 0x01;
    char buffer;
    
    if(pcf8563_i2c.write(W8563_ADDR, &start, 1) != 0) return 0;
    //if(pcf8563_i2c.read(R8563_ADDR, buffer, 1) != 0) return 0;
    
    pcf8563_i2c.start();
    pcf8563_i2c.write(R8563_ADDR);
    buffer = pcf8563_i2c.read(0);
    pcf8563_i2c.stop();
    
    buffer = buffer & 0x08;
    if(buffer == 0x08)
    {
        usart2.printf("== ALARM ON ==\r\n");
        wait_ms(200);
        
        alarmOff();
    }
    return true;
}