void rtc_set_alarm(int h, int m)
{
unsigned char buf[4] = {0};
int i, rv;
/* clear alarm interrupt */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, buf);
buf[0] &= RTC_AF;
pp_i2c_send(RTC_ADDR, RTC_CTRL2, buf[0]);
/* prepare new alarm */
if( m >= 0 )
buf[0] = DEC2BCD(m);
else
/* ignore minutes comparison query */
buf[0] = RTC_AE;
if( h >= 0 )
buf[1] = DEC2BCD(h);
else
/* ignore hours comparison query */
buf[1] = RTC_AE;
/* ignore day and wday */
buf[2] = RTC_AE;
buf[3] = RTC_AE;
/* write new alarm */
for(i = 0; i < 4; i++)
pp_i2c_send(RTC_ADDR, RTC_ALARM_MINUTES + i, buf[i]);
/* note: alarm is not enabled at the point */
}
void rtc_init(void)
{
unsigned char tmp;
int rv;
/* initialize Control 1 register */
tmp = 0;
pp_i2c_send(RTC_ADDR, RTC_CTRL1, tmp);
/* read value of the Control 2 register - we'll need it to preserve alarm and timer interrupt assertion flags */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
/* preserve alarm and timer interrupt flags */
tmp &= (RTC_TF | RTC_AF | RTC_TIE | RTC_AIE);
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
bool rtc_check_alarm_started(bool release_alarm)
{
static bool alarm_state, run_before = false;
unsigned char tmp=0;
bool started;
int rv=0;
if (run_before)
{
started = alarm_state;
alarm_state &= ~release_alarm;
}
else
{
/* read Control 2 register which contains alarm flag */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
alarm_state = started = ( (tmp & RTC_AF) && (tmp & RTC_AIE) );
if(release_alarm && started)
{
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
/* clear alarm interrupt enable and alarm flag */
tmp &= ~(RTC_AF | RTC_AIE);
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
run_before = true;
rtc_lock_alarm_clear = false;
}
return started;
}
int pcf50605_write_multiple(int address, const unsigned char* buf, int count)
{
int i;
i2c_lock();
for (i = 0; i < count; i++)
pp_i2c_send(0x8, address + i, buf[i]);
i2c_unlock();
return 0;
}
void rtc_enable_alarm(bool enable)
{
unsigned char tmp=0;
int rv=0;
if(enable)
{
/* enable alarm interrupt */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
tmp |= RTC_AIE;
tmp &= ~RTC_AF;
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
else
{
/* disable alarm interrupt */
if(rtc_lock_alarm_clear)
/* lock disabling alarm before it was checked whether or not the unit was started by RTC alarm */
return;
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
tmp &= ~(RTC_AIE | RTC_AF);
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
}
int rtc_write_datetime(const struct tm *tm)
{
unsigned int i;
unsigned char buf[7];
buf[0] = tm->tm_sec;
buf[1] = tm->tm_min;
buf[2] = tm->tm_hour;
buf[3] = tm->tm_mday;
buf[4] = tm->tm_wday;
buf[5] = tm->tm_mon + 1;
buf[6] = tm->tm_year - 100;
for (i = 0; i < sizeof(buf); i++)
pp_i2c_send(RTC_ADDR, 0x02 + i, DEC2BCD(buf[i]));
return 1;
}
int pcf50605_write(int address, unsigned char val)
{
pp_i2c_send(0x8, address, val);
return 0;
}