File content as of revision 1:41dd31bbbe6d:

#include "mbed.h"
#include "PCF8523.h"

extern Serial dbg;

PCF8523::PCF8523(PinName sda, PinName scl) : i2c (sda, scl)
{
    i2c.frequency(100000);
}

PCF8523::~PCF8523()
{
    
}

bool PCF8523::write(char adr, char data)
{
    w[0] = adr;
    w[1] = data;
    if (i2c.write(address, w, 2) != 0) return 0;
    
    return true;
}

char PCF8523::read(char adr)
{
    char start = adr;
    if (i2c.write(address, &start, 1, true) != 0) return 0;
    if (i2c.read(address, r, 1) != 0) return 0;
    
    return r[0];
}

time_t PCF8523::now()
{
    struct tm now;
    
    char buffer[6];
    
    buffer [0] = read(SEC);
    buffer [1] = read(MIN);
    buffer [2] = read(HOUR);
    buffer [3] = read(DAY);
    buffer [4] = read(MONTH);
    buffer [5] = read(YEAR);
    
    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[4] & 0x1F) - 1;
    now.tm_year = bcdToDecimal(buffer[5] & 0xFF) + 2000 - 1900;
    
    return mktime(&now);
}

bool PCF8523::set_time(time_t time)
{
    struct tm *now;
    char buffer[9];
    
    now = localtime(&time);
    
    buffer[0] = decimalToBcd(now->tm_sec) & 0x7F; // VL = 0
    buffer[1] = decimalToBcd(now->tm_min) & 0x7F;
    buffer[2] = decimalToBcd(now->tm_hour) & 0x3F;
    buffer[3] = decimalToBcd(now->tm_mday) & 0x3F;
    buffer[4] = now->tm_wday + 1;
    buffer[5] = decimalToBcd(now->tm_mon+1) & 0x1F;
    buffer[6] = decimalToBcd(now->tm_year + 1900 - 2000);
    
    if(!write(SEC, buffer[0]))return 0;
    if(!write(MIN, buffer[1]))return 0;
    if(!write(HOUR, buffer[2]))return 0;
    if(!write(DAY, buffer[3]))return 0;
    if(!write(WDAY, buffer[4]))return 0;
    if(!write(MONTH, buffer[5]))return 0;
    if(!write(YEAR, buffer[6]))return 0;
    
    return true;
}

bool PCF8523::Initialize(char adr, uint8_t val)
{
    char buffer[4];
    buffer[0] = val;
    if(!write(adr, buffer[0]))return 0;
    
    return true;
}

bool PCF8523::IsConnected()
{
    bool ok = false;
    
    i2c.start();
    i2c.stop();
    
    if (i2c.read(address, &data[0], 1) != 0)
    {
        dbg.printf("PCF8523 is not detected\r\n");
        ok = false;
    }
    else
    {
        dbg.printf("PCF8523 is detected\r\n");
        ok = true;
    }
        
    data[0] = 0;
    i2c.start();
    i2c.stop();
    
    return ok;
}

bool PCF8523::set_alarm(const struct tm &now, bool min_en, bool hour_en, bool mday_en)
{
    /*
    // Alarm register                   | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
    CTRL1       = 0x00, // Ctrl 1       |Cap Sel|   T   | Stop  |  SR   | 12-24 |  SIE  |  AIE  |  CIE  |
    
    MINALARM    = 0x0A, // Minute       | AEN_M |                       ( 0 - 59 )                      |
    HOURALARM   = 0x0B, // Hour         | AEN_H |   X   |               ( 0 - 23 )                      |
                        // Hour         | AEN_H |   X   | AM/PM |       ( 1 - 12 )                      |
    DAYALARM    = 0x0C, // Day          | AEN_D |   X   |               ( 1 - 31 )                      |
    WDAYALARM   = 0x0D, // Day of week  | AEN_W |   X   |   X   |   X   |   X   |       ( 0 - 6 )       |
    
    AEN_M, AEN_H, AEN_D, AEN_W => 0 = enable; 1 = disable
    */
    
    char buffer[3] = {0x00, 0x00, 0x00};
    
//    if(now.tm_min >= 60)
//        now.tm_min = 0;
//    
//    if(now.tm_hour >= 24)
//        now.tm_hour = 0;
//        
//    if(now.tm_mday >= 32)
//        now.tm_mday = 1;
//        
    if(min_en)
    {
        buffer[0] = (decimalToBcd(now.tm_min) & 0x7F);
        if(!write(MINALARM, buffer[0]))return 0;
    }
    else
    {
        buffer[0] = (decimalToBcd(now.tm_min) | 0x80);
        if(!write(MINALARM, buffer[0]))return 0;
    }
    
    if(hour_en)
    {
        buffer[1] = (decimalToBcd(now.tm_hour) & 0x3F);
        if(!write(HOURALARM, buffer[1]))return 0;
    }
    else
    {
        buffer[1] = (decimalToBcd(now.tm_hour) | 0x80);
        if(!write(HOURALARM, buffer[1]))return 0;
    }
    
    if(mday_en)
    {
        buffer[2] = (decimalToBcd(now.tm_mday) & 0x3F);
        if(!write(DAYALARM, buffer[2]))return 0;
    }
    else
    {
        buffer[2] = (decimalToBcd(now.tm_mday) | 0x80);
        if(!write(DAYALARM, buffer[2]))return 0;
    }
    return true;
}

bool PCF8523::enable_alarm(bool enable)
{
    char buffer = read(CTRL1);
    
    if(enable)
    {
        // Disable Clockout & other Timers
        if(!write(TMRCLKOUT, 0x38))
        
        // Clear any existing flags
        alarm_off(0x08);
        
        // enable AIE bit
        buffer = buffer | 0x02;
    }
    else
    {
        buffer &= ~0x02;
    }
    
    if(!write(CTRL1, buffer)) return 0;
    
    return true;
}

bool PCF8523::alarm_off(char buffer)
{   
    // clear AF flag
    buffer = buffer - 0x08;
    
    if(!write(CTRL2, buffer))return 0;
    
    return true;
}

bool PCF8523::check_alarm()
{
    char buffer;
    
    buffer = read(CTRL2);
    
    if(buffer & 0x08)
    {
        if(alarm_off(buffer))
            return true;
        else return 0;
    }
    else return 0;
}

bool PCF8523::software_reset()
{
    char buffer = 0x58;
    
    if(!write(CTRL1, buffer)) return 0;
    
    return 1;
}