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Add support for Sansa scrollwheel backlight. Turn light on when scrollwheel is in use, then back off again after a 5 second timeout.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11807 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Barry Wardell 2006-12-18 19:08:41 +00:00
parent e90006133b
commit a69b53dc89
1 changed files with 32 additions and 1 deletions
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33
firmware/target/arm/sandisk/sansa-e200/button-e200.c
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@ -31,12 +31,29 @@
static unsigned int old_wheel_value = 0;
static unsigned int wheel_repeat = BUTTON_NONE;
/* Wheel backlight control */
#define WHEEL_BACKLIGHT_TIMEOUT 5*HZ;
static unsigned int wheel_backlight_timer;
void wheel_backlight_on(bool enable)
{
if(enable)
GPIOG_OUTPUT_VAL |=0x80;
else
GPIOG_OUTPUT_VAL &=~ 0x80;
}
void button_init_device(void)
{
/* Enable all buttons */
GPIOF_ENABLE |= 0xff;
GPIOH_ENABLE |= 0xc0;
/* Scrollwheel light - enable control through GPIOG pin 7 and set timeout */
GPIOG_ENABLE = 0x80;
GPIOG_OUTPUT_EN |= 0x80;
wheel_backlight_timer = WHEEL_BACKLIGHT_TIMEOUT;
/* Read initial wheel value (bit 6-7 of GPIOH) */
old_wheel_value = GPIOH_INPUT_VAL & 0xc0;
}
@ -137,6 +154,20 @@ int button_read_device(void)
old_wheel_value = new_wheel_value;
}
if(wheel_backlight_timer>0){
wheel_backlight_timer--;
if(wheel_backlight_timer==0){
wheel_backlight_on(false);
}
}
if( (btn & BUTTON_SCROLL_UP) || (btn & BUTTON_SCROLL_DOWN) ){
if(wheel_backlight_timer==0){
wheel_backlight_on(true);
}
wheel_backlight_timer = WHEEL_BACKLIGHT_TIMEOUT;
}
return btn;
}