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A proper alarm clock for the V2/FM (and v1 with mod)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5818 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Christi Scarborough 2005-02-06 17:21:42 +00:00
parent 59eb461f82
commit a83ffb208f
5 changed files with 62 additions and 23 deletions
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36
firmware/drivers/rtc.c
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@ -20,6 +20,7 @@
#ifdef HAVE_RTC
#include "i2c.h"
#include "rtc.h"
#include "kernel.h"
#include <stdbool.h>
#define RTC_ADR 0xd0
@ -31,7 +32,7 @@ void rtc_init(void)
unsigned char data;
#ifdef HAVE_ALARM_MOD
/* Check + save alarm bit first, since something in rtc_init resets AF */
/* Check + save alarm bit first, before the power thread starts watching */
rtc_check_alarm_started(false);
#endif
@ -67,7 +68,6 @@ void rtc_init(void)
otherwise the player can't be turned off. */
rtc_write(8, rtc_read(8) | 0x80);
rtc_enable_alarm(false);
#endif
}
@ -85,12 +85,23 @@ bool rtc_check_alarm_started(bool release_alarm)
alarm_state &= ~release_alarm;
} else {
/* This call resets AF, so we store the state for later recall */
rc = alarm_state = ((rtc_read(0x0f) & 0x40) != 0);
rc = alarm_state = rtc_check_alarm_flag();
run_before = true;
}
return rc;
}
/*
* Checks the AL register. This call resets AL once read.
*
* We're only interested if ABE is set. AL is still raised regardless
* even if the unit is off when the alarm occurs.
*/
bool rtc_check_alarm_flag(void)
{
return ( ( (rtc_read(0x0f) & 0x40) != 0) &&
(rtc_read(0x0a) & 0x20) );
}
/* set alarm time registers to the given time (repeat once per day) */
void rtc_set_alarm(int h, int m)
@ -140,14 +151,21 @@ bool rtc_enable_alarm(bool enable)
rtc_write(0x0a, data);
/* check if alarm flag AF is off (as it should be) */
if ((rtc_read(0x0f) & 0x40) != 0) /* on */
/* in some cases enabling the alarm results in an activated AF flag */
/* this should not happen, but it does */
/* if you know why, tell me! */
/* for now, we try again forever in this case */
while (rtc_check_alarm_flag()) /* on */
{
data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
rtc_write(0x0a, data);
return true;
} else {
return false; /* all ok */
data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
rtc_write(0x0a, data);
sleep(HZ / 10);
rtc_check_alarm_flag();
data |= 0xa0; /* turn bit d7=AFE and d5=ABE on */
rtc_write(0x0a, data);
}
return false; /* all ok */
}
#endif /* HAVE_ALARM_MOD */