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authorThom Johansen <thomj@rockbox.org>2007-02-28 21:55:11 +0000
committerThom Johansen <thomj@rockbox.org>2007-02-28 21:55:11 +0000
commit8fd6d658a1caeddc0a84dd69ffe45739bd466e74 (patch)
tree91f79d4d40d898a303998710a18ae62d8b8c7082 /firmware/drivers/rtc/rtc_pcf50605.c
parentab66955664f8987d064247dc6d585b5618745d29 (diff)
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Add wake on alarm support for Ipods. Rename HAVE_ALARM_MOD to HAVE_ALARM_RTC since it's not always a mod. Make Ipod PCF driver keep other flags in OOCC1 that have been set instead of overwriting them.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12522 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/drivers/rtc/rtc_pcf50605.c')
-rw-r--r--firmware/drivers/rtc/rtc_pcf50605.c94
1 files changed, 90 insertions, 4 deletions
diff --git a/firmware/drivers/rtc/rtc_pcf50605.c b/firmware/drivers/rtc/rtc_pcf50605.c
index 1bc40146ff..fedcdd3cdf 100644
--- a/firmware/drivers/rtc/rtc_pcf50605.c
+++ b/firmware/drivers/rtc/rtc_pcf50605.c
@@ -24,8 +24,12 @@
#include "pcf50605.h"
#include <stdbool.h>
+/* Values which each disable one alarm time register */
+static char alarm_disable[] = { 0x7f, 0x7f, 0x3f, 0x07, 0x3f, 0x1f, 0xff };
+
void rtc_init(void)
{
+ rtc_check_alarm_started(false);
}
int rtc_read_datetime(unsigned char* buf)
@@ -35,11 +39,93 @@ int rtc_read_datetime(unsigned char* buf)
int rtc_write_datetime(unsigned char* buf)
{
- int i;
+ pcf50605_write_multiple(0x0a, buf, 7);
+ return 1;
+}
+
+/**
+ * Checks the PCF interrupt 1 register bit 7 to see if an alarm interrupt has
+ * triggered since last we checked.
+ */
+bool rtc_check_alarm_flag(void)
+{
+ return pcf50605_read(0x02) & 0x80;
+}
- for (i=0;i<7;i++) {
- pcf50605_write(0x0a+i, buf[i]);
+/**
+ * Enables or disables the alarm.
+ * The Ipod bootloader clears all PCF interrupt registers and always enables
+ * the "wake on RTC" bit on OOCC1, so we have to rely on other means to find
+ * out if we just woke from an alarm.
+ * Return value is always false for us.
+ */
+bool rtc_enable_alarm(bool enable)
+{
+ if (enable) {
+ /* Tell the PCF to ignore everything but second, minute and hour, so
+ * that an alarm will trigger the next time the alarm time occurs.
+ */
+ pcf50605_write_multiple(0x14, alarm_disable + 3, 4);
+ /* Unmask the alarm interrupt (might be unneeded) */
+ pcf50605_write(0x5, pcf50605_read(0x5) & ~0x80);
+ /* Make sure wake on RTC is set */
+ pcf50605_write(0x8, pcf50605_read(0x8) | 0x10);
+ } else {
+ /* We use this year to indicate a disabled alarm. If you happen to live
+ * around this time and are annoyed by this, feel free to seek out my
+ * grave and do something nasty to it.
+ */
+ pcf50605_write(0x17, 0x99);
}
+ return false;
+}
- return 1;
+/**
+ * Check if alarm caused unit to start.
+ */
+bool rtc_check_alarm_started(bool release_alarm)
+{
+ static bool run_before = false, alarm_state;
+ bool rc;
+
+ if (run_before) {
+ rc = alarm_state;
+ alarm_state &= ~release_alarm;
+ } else {
+ char rt[3], at[3];
+ /* The Ipod bootloader seems to read (and thus clear) the PCF interrupt
+ * registers, so we need to find some other way to detect if an alarm
+ * just happened
+ */
+ pcf50605_read_multiple(0x0a, rt, 3);
+ pcf50605_read_multiple(0x11, at, 3);
+
+ /* If alarm time and real time match within 10 seconds of each other, we
+ * assume an alarm just triggered
+ */
+ rc = alarm_state = rt[1] == at[1] && rt[2] == at[2]
+ && (rt[0] - at[0]) <= 10;
+ run_before = true;
+ }
+ return rc;
+}
+
+void rtc_set_alarm(int h, int m)
+{
+ /* Set us to wake at the first second of the specified time */
+ pcf50605_write(0x11, 0);
+ /* Convert to BCD */
+ pcf50605_write(0x12, ((m/10) << 4) | m%10);
+ pcf50605_write(0x13, ((h/10) << 4) | h%10);
}
+
+void rtc_get_alarm(int *h, int *m)
+{
+ char buf[2];
+
+ pcf50605_read_multiple(0x12, buf, 2);
+ /* Convert from BCD */
+ *m = ((buf[0] >> 4) & 0x7)*10 + (buf[0] & 0x0f);
+ *h = ((buf[1] >> 4) & 0x3)*10 + (buf[1] & 0x0f);
+}
+