H300/X5: Moved backlight brightness code to target tree. Created __backlight_set_brightness in backlight-(target).c. backlight_set_brightness range clamps and calls the backlight driver.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11488 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 11 insertions, 0 deletions

diff --git a/firmware/target/coldfire/iaudio/x5/backlight-target.h b/firmware/target/coldfire/iaudio/x5/backlight-target.h
index 262650ae24..e982e656d6 100755
--- a/firmware/target/coldfire/iaudio/x5/backlight-target.h
+++ b/firmware/target/coldfire/iaudio/x5/backlight-target.h
@@ -21,6 +21,7 @@
 
 void __backlight_on(void);
 void __backlight_off(void);
+void __backlight_set_brightness(int val);
 void __remote_backlight_on(void);
 void __remote_backlight_off(void);
 
diff --git a/firmware/target/coldfire/iaudio/x5/backlight-x5.c b/firmware/target/coldfire/iaudio/x5/backlight-x5.c
index 70a5d957b6..9d02c35988 100755
--- a/firmware/target/coldfire/iaudio/x5/backlight-x5.c
+++ b/firmware/target/coldfire/iaudio/x5/backlight-x5.c
@@ -40,6 +40,16 @@ void __backlight_off(void)
     lcd_enable(false);
 }
 
+/* set brightness by changing the PWM */
+void __backlight_set_brightness(int val)
+{
+    /* disable IRQs while bitbanging */
+    int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
+    pcf50606_write(0x35, (val << 1) | 0x01); /* 512Hz, Enable PWM */
+    /* enable IRQs again */
+    set_irq_level(old_irq_level);
+}
+
 void __remote_backlight_on(void)
 {
     and_l(~0x00200000, &GPIO_OUT);