diff options
Diffstat (limited to 'firmware/target')
| -rw-r--r-- | firmware/target/sh/archos/fm_v2/backlight-target.h | 18 | ||||
| -rw-r--r-- | firmware/target/sh/archos/recorder/backlight-target.h | 18 |
2 files changed, 28 insertions, 8 deletions
diff --git a/firmware/target/sh/archos/fm_v2/backlight-target.h b/firmware/target/sh/archos/fm_v2/backlight-target.h index f9da89b042..9eff09016a 100644 --- a/firmware/target/sh/archos/fm_v2/backlight-target.h +++ b/firmware/target/sh/archos/fm_v2/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 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 |