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-rw-r--r--firmware/target/sh/archos/recorder/backlight-target.h18
1 files changed, 14 insertions, 4 deletions
diff --git a/firmware/target/sh/archos/recorder/backlight-target.h b/firmware/target/sh/archos/recorder/backlight-target.h
index f9da89b042..9eff09016a 100644
--- a/firmware/target/sh/archos/recorder/backlight-target.h
+++ b/firmware/target/sh/archos/recorder/backlight-target.h
@@ -28,14 +28,24 @@
static inline void _backlight_on(void)
{
- /* Enable square wave */
- rtc_write(0x0a, rtc_read(0x0a) | 0x40);
+ rtc_write(0x13, 0x10); /* 32 kHz square wave */
+ rtc_write(0x0a, rtc_read(0x0a) | 0x40); /* Enable square wave */
}
static inline void _backlight_off(void)
{
- /* Disable square wave */
- rtc_write(0x0a, rtc_read(0x0a) & ~0x40);
+ /* While on, backlight is flashing at 32 kHz. If the square wave output
+ is disabled while the backlight is lit, it will become constantly lit,
+ (brighter) and slowly fade. This resets the square wave counter and
+ results in the unlit state */
+ unsigned char rtc_0a = rtc_read(0x0a) & ~0x40;
+ rtc_write(0x0a, rtc_0a); /* Disable square wave */
+ rtc_write(0x13, 0xF0); /* 1 Hz square wave */
+ rtc_write(0x0a, rtc_0a | 0x40); /* Enable square wave */
+
+ /* When the square wave output is disabled in the unlit state,
+ the backlight stays off */
+ rtc_write(0x0a, rtc_0a);
}
#endif