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authorBoris Gjenero <dreamlayers@rockbox.org>2009-04-14 19:23:39 +0000
committerBoris Gjenero <dreamlayers@rockbox.org>2009-04-14 19:23:39 +0000
commit0e74f75deba4029751050eefa6c4d13c1880b5d2 (patch)
tree55cc7fb01e027799cd41352d28f7c415b811fc48 /firmware/target/sh
parent5b6af5e56019eec701f81450b79ca413fbae6032 (diff)
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FS#9635 - On V1, V2 and FM Archos recorders, ensure instant backlight switch-off. (Formerly, backlight switch-off was unpredicrable on some of these devices. The backlight would either turn off instantly or brighten instantly and then fade.)
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20707 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/sh')
-rw-r--r--firmware/target/sh/archos/fm_v2/backlight-target.h18
-rw-r--r--firmware/target/sh/archos/recorder/backlight-target.h18
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