Weekday alarm in PCF8583

[otuzsubat]

I want to use weekday alarm in PCF8583. For example, i want that it produces an interrupt at every Monday, 13:30. My code is below. Could you say me where is the mistake?

int int2bcd(int dec){
return ((dec/10)<<4)+(dec%10);
}

void rtc_set(){
i2c_start();
i2c_write(0xA2); //send device address
i2c_write(0x00);//send address byte

i2c_write(0x80);//Stop RTC counting
/*************Write actual time ****************/
i2c_write(0x00);//Hundredth of second
i2c_write(0x00);//Seconds
i2c_write(rtc[3]);//Minutes(in BCD format)
i2c_write(rtc[2]);//Hours(in BCD format, 24hour format)
i2c_write(rtc[0]);//Year/Date(in BCD format)
i2c_write(rtc[1]);//Weekday/Month(in BCD format)
i2c_write(0x00);//Disable Timer
/*************Write alarm time ****************/
i2c_write(0xA0);// Alarm Flag, Interrupt, No timer alarm, Weekday alarm
i2c_write(0x00);//Alarm Hundredth of second
i2c_write(0x00);//Alarm Seconds
i2c_write(int2bcd(alarm.minute));//Alarm Minutes
i2c_write(int2bcd(alarm.hour));//Alarm Hours
i2c_write(0x00);//Alarm Date
i2c_write((0x01<<(alarm.day-1)));//Alarm Weekday
i2c_stop();
delay_ms(5);

i2c_start();//start transmission
i2c_write(0x00); //send device address
i2c_write(0x00);//Send address byte
i2c_write(0x04);//Start RTC counting
i2c_stop();
delay_ms(5);
}

[bdavis]

You are writing to two different device address's - one at the top, and the one near the bottom are different. Doesn't seem correct to me...

[Kenny]

Try poking some values directly into the registers for testing.
I tried the code below and it works. For testing 15 seconds is allowed till the interrupt occurs. The interrupt flag (bit 1 in control reg.) will need to be cleared after it occurs by writing the control byte again
write_rtc(0x00,0x04);

[otuzsubat]