Implement contrast setting for iPod greyscale LCD

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8643 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 6 insertions, 2 deletions

diff --git a/firmware/drivers/lcd-2bit-horz.c b/firmware/drivers/lcd-2bit-horz.c
index fd6be0be05..1045ba654b 100644
--- a/firmware/drivers/lcd-2bit-horz.c
+++ b/firmware/drivers/lcd-2bit-horz.c
@@ -84,7 +84,7 @@ void lcd_init(void)
 
 int lcd_default_contrast(void)
 {
-    return 96;
+    return 40;
 }
 
 /*** parameter handling ***/
diff --git a/firmware/drivers/lcd-ipod.c b/firmware/drivers/lcd-ipod.c
index d37981a964..d1d63b9911 100644
--- a/firmware/drivers/lcd-ipod.c
+++ b/firmware/drivers/lcd-ipod.c
@@ -158,9 +158,13 @@ void lcd_update(void)
     lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
 }
 
+/* Rockbox stores the contrast as 0..63 - we add 64 to it */
 void lcd_set_contrast(int val)
 {
-    lcd_cmd_and_data(0x4, 0x4, val);
+    if (val < 0) val = 0;
+    else if (val > 63) val = 63;
+
+    lcd_cmd_and_data(0x4, 0x4, val + 64);
     lcd_contrast = val;
 }