8fd6d658a1
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12522 a1c6a512-1295-4272-9138-f99709370657
131 lines
4 KiB
C
131 lines
4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "i2c.h"
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#include "rtc.h"
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#include "kernel.h"
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#include "system.h"
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#include "pcf50605.h"
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#include <stdbool.h>
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/* Values which each disable one alarm time register */
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static char alarm_disable[] = { 0x7f, 0x7f, 0x3f, 0x07, 0x3f, 0x1f, 0xff };
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void rtc_init(void)
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{
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rtc_check_alarm_started(false);
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}
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int rtc_read_datetime(unsigned char* buf)
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{
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return pcf50605_read_multiple(0x0a, buf, 7);
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}
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int rtc_write_datetime(unsigned char* buf)
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{
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pcf50605_write_multiple(0x0a, buf, 7);
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return 1;
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}
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/**
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* Checks the PCF interrupt 1 register bit 7 to see if an alarm interrupt has
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* triggered since last we checked.
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*/
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bool rtc_check_alarm_flag(void)
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{
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return pcf50605_read(0x02) & 0x80;
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}
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/**
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* Enables or disables the alarm.
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* The Ipod bootloader clears all PCF interrupt registers and always enables
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* the "wake on RTC" bit on OOCC1, so we have to rely on other means to find
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* out if we just woke from an alarm.
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* Return value is always false for us.
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*/
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bool rtc_enable_alarm(bool enable)
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{
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if (enable) {
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/* Tell the PCF to ignore everything but second, minute and hour, so
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* that an alarm will trigger the next time the alarm time occurs.
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*/
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pcf50605_write_multiple(0x14, alarm_disable + 3, 4);
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/* Unmask the alarm interrupt (might be unneeded) */
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pcf50605_write(0x5, pcf50605_read(0x5) & ~0x80);
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/* Make sure wake on RTC is set */
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pcf50605_write(0x8, pcf50605_read(0x8) | 0x10);
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} else {
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/* We use this year to indicate a disabled alarm. If you happen to live
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* around this time and are annoyed by this, feel free to seek out my
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* grave and do something nasty to it.
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*/
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pcf50605_write(0x17, 0x99);
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}
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return false;
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}
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/**
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* Check if alarm caused unit to start.
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*/
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bool rtc_check_alarm_started(bool release_alarm)
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{
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static bool run_before = false, alarm_state;
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bool rc;
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if (run_before) {
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rc = alarm_state;
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alarm_state &= ~release_alarm;
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} else {
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char rt[3], at[3];
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/* The Ipod bootloader seems to read (and thus clear) the PCF interrupt
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* registers, so we need to find some other way to detect if an alarm
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* just happened
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*/
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pcf50605_read_multiple(0x0a, rt, 3);
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pcf50605_read_multiple(0x11, at, 3);
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/* If alarm time and real time match within 10 seconds of each other, we
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* assume an alarm just triggered
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*/
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rc = alarm_state = rt[1] == at[1] && rt[2] == at[2]
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&& (rt[0] - at[0]) <= 10;
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run_before = true;
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}
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return rc;
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}
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void rtc_set_alarm(int h, int m)
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{
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/* Set us to wake at the first second of the specified time */
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pcf50605_write(0x11, 0);
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/* Convert to BCD */
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pcf50605_write(0x12, ((m/10) << 4) | m%10);
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pcf50605_write(0x13, ((h/10) << 4) | h%10);
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}
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void rtc_get_alarm(int *h, int *m)
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{
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char buf[2];
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pcf50605_read_multiple(0x12, buf, 2);
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/* Convert from BCD */
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*m = ((buf[0] >> 4) & 0x7)*10 + (buf[0] & 0x0f);
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*h = ((buf[1] >> 4) & 0x3)*10 + (buf[1] & 0x0f);
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}
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