1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
12 * All files in this archive are subject to the GNU General Public License.
13 * See the file COPYING in the source tree root for full license agreement.
15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
16 * KIND, either express or implied.
18 ****************************************************************************/
27 /* Values which each disable one alarm time register */
28 static const char alarm_disable
[] = {
29 0x7f, 0x7f, 0x3f, 0x07, 0x3f, 0x1f, 0xff
34 rtc_check_alarm_started(false);
37 int rtc_read_datetime(unsigned char* buf
)
39 return pcf50605_read_multiple(0x0a, buf
, 7);
42 int rtc_write_datetime(unsigned char* buf
)
44 pcf50605_write_multiple(0x0a, buf
, 7);
49 * Checks the PCF interrupt 1 register bit 7 to see if an alarm interrupt has
50 * triggered since last we checked.
52 bool rtc_check_alarm_flag(void)
54 return pcf50605_read(0x02) & 0x80;
58 * Enables or disables the alarm.
59 * The Ipod bootloader clears all PCF interrupt registers and always enables
60 * the "wake on RTC" bit on OOCC1, so we have to rely on other means to find
61 * out if we just woke from an alarm.
62 * Return value is always false for us.
64 bool rtc_enable_alarm(bool enable
)
67 /* Tell the PCF to ignore everything but second, minute and hour, so
68 * that an alarm will trigger the next time the alarm time occurs.
70 pcf50605_write_multiple(0x14, alarm_disable
+ 3, 4);
71 /* Unmask the alarm interrupt (might be unneeded) */
72 pcf50605_write(0x5, pcf50605_read(0x5) & ~0x80);
73 /* Make sure wake on RTC is set when shutting down */
74 pcf50605_wakeup_flags
|= 0x10;
76 /* We use this year to indicate a disabled alarm. If you happen to live
77 * around this time and are annoyed by this, feel free to seek out my
78 * grave and do something nasty to it.
80 pcf50605_write(0x17, 0x99);
81 /* Make sure we don't wake on RTC after shutting down */
82 pcf50605_wakeup_flags
&= ~0x10;
88 * Check if alarm caused unit to start.
90 bool rtc_check_alarm_started(bool release_alarm
)
92 static bool run_before
= false, alarm_state
;
97 alarm_state
&= ~release_alarm
;
100 /* The Ipod bootloader seems to read (and thus clear) the PCF interrupt
101 * registers, so we need to find some other way to detect if an alarm
104 pcf50605_read_multiple(0x0a, rt
, 3);
105 pcf50605_read_multiple(0x11, at
, 3);
107 /* If alarm time and real time match within 10 seconds of each other, we
108 * assume an alarm just triggered
110 rc
= alarm_state
= rt
[1] == at
[1] && rt
[2] == at
[2]
111 && (rt
[0] - at
[0]) <= 10;
117 void rtc_set_alarm(int h
, int m
)
119 /* Set us to wake at the first second of the specified time */
120 pcf50605_write(0x11, 0);
122 pcf50605_write(0x12, ((m
/10) << 4) | m
%10);
123 pcf50605_write(0x13, ((h
/10) << 4) | h
%10);
126 void rtc_get_alarm(int *h
, int *m
)
130 pcf50605_read_multiple(0x12, buf
, 2);
131 /* Convert from BCD */
132 *m
= ((buf
[0] >> 4) & 0x7)*10 + (buf
[0] & 0x0f);
133 *h
= ((buf
[1] >> 4) & 0x3)*10 + (buf
[1] & 0x0f);