From 638184f1a28f6e2fab225d9630baccdcff6dbf16 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Tue, 13 Aug 2002 11:10:11 +0000
Subject: Added LCD contrast setting

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1710 a1c6a512-1295-4272-9138-f99709370657
---
 apps/settings.c        |  6 ++++++
 apps/settings.h        |  8 +++++++-
 apps/settings_menu.c   |  8 ++++++++
 firmware/drivers/lcd.c | 36 +++++++++++++++++++++---------------
 firmware/drivers/lcd.h |  1 +
 5 files changed, 43 insertions(+), 16 deletions(-)

diff --git a/apps/settings.c b/apps/settings.c
index 274a124d31..5dd5ea144a 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -276,6 +276,8 @@ int settings_save( void )
     
     rtc_config_block[0x11] = (unsigned char)global_settings.avc;
     
+    rtc_config_block[0x12] = (unsigned char)global_settings.contrast;
+    
     memcpy(&rtc_config_block[0x24], &global_settings.total_uptime, 4);
     
     if(save_config_buffer())
@@ -350,9 +352,13 @@ void settings_load(void)
         if (rtc_config_block[0x11] != 0xFF)
             global_settings.avc = rtc_config_block[0x11];
 
+        if (rtc_config_block[0x12] != 0xff)
+            global_settings.contrast = rtc_config_block[0x12];
+
         if (rtc_config_block[0x24] != 0xFF)
             memcpy(&global_settings.total_uptime, &rtc_config_block[0x24], 4);
     }
+    lcd_set_contrast(global_settings.contrast);
     lcd_scroll_speed(global_settings.scroll_speed);
     backlight_time(global_settings.backlight);
 #ifdef HAVE_CHARGE_CTRL
diff --git a/apps/settings.h b/apps/settings.h
index e0f0571def..1315cdcbd9 100644
--- a/apps/settings.h
+++ b/apps/settings.h
@@ -101,7 +101,13 @@ extern struct user_settings global_settings;
 #define DEFAULT_LOUDNESS_SETTING    0
 #define DEFAULT_BASS_BOOST_SETTING  0
 #define DEFAULT_AVC_SETTING         0
-#define DEFAULT_CONTRAST_SETTING    0
+#ifdef HAVE_LCD_CHARCELLS
+#define MAX_CONTRAST_SETTING    31
+#define DEFAULT_CONTRAST_SETTING    15
+#else
+#define MAX_CONTRAST_SETTING    63
+#define DEFAULT_CONTRAST_SETTING    32
+#endif
 #define DEFAULT_POWEROFF_SETTING    0
 #define DEFAULT_BACKLIGHT_SETTING   5
 #define DEFAULT_WPS_DISPLAY         0 
diff --git a/apps/settings_menu.c b/apps/settings_menu.c
index b2ca475619..0dbe50d9cb 100644
--- a/apps/settings_menu.c
+++ b/apps/settings_menu.c
@@ -35,6 +35,13 @@
 #include "powermgmt.h"
 #include "rtc.h"
 
+
+static void contrast(void)
+{
+    set_int( "[Contrast]", "", &global_settings.contrast, 
+             lcd_set_contrast, 1, 0, MAX_CONTRAST_SETTING );
+}
+
 static void shuffle(void)
 {
     set_bool( "[Shuffle]", &global_settings.playlist_shuffle );
@@ -133,6 +140,7 @@ void settings_menu(void)
         { "MP3/M3U filter",  mp3_filter      },
         { "Sort mode",       sort_case       },
         { "Backlight Timer", backlight_timer },
+        { "Contrast",    contrast    },  
         { "Scroll speed",    scroll_speed    },  
         { "While Playing",   wps_set         },
 #ifdef HAVE_CHARGE_CTRL
diff --git a/firmware/drivers/lcd.c b/firmware/drivers/lcd.c
index 81dc41fff3..b67be4e761 100644
--- a/firmware/drivers/lcd.c
+++ b/firmware/drivers/lcd.c
@@ -38,9 +38,6 @@
 
 #define LCDR (PBDR_ADDR+1)
 
-/* PA14 : /LCD-BL --- backlight */
-#define LCD_BL 6
-
 #ifdef HAVE_LCD_CHARCELLS
 
 #define LCD_DS  1 // PB0 = 1 --- 0001 ---  LCD-DS
@@ -323,18 +320,7 @@ static void lcd_write(bool command, int byte)
     PBDR |= LCD_CS; /* disable lcd chip select */
 }
 #endif /* ASM_IMPLEMENTATION */
-
-/*** BACKLIGHT ***/
-
-void lcd_backlight(bool on)
-{
-    if ( on )
-    PAIOR |= LCD_BL;
-    else
-    PAIOR &= ~LCD_BL;
-}
-
-#endif /* SIMULATOR */
+#endif /* !SIMULATOR */
 
 unsigned char icon_mirror[11];
 
@@ -524,6 +510,26 @@ void lcd_init (void)
 }
 #endif
 
+#ifdef SIMULATOR
+void lcd_set_contrast(int val)
+{
+    val = val;
+}
+#else
+#ifdef HAVE_LCD_BITMAP
+void lcd_set_contrast(int val)
+{
+    lcd_write(true, LCD_CNTL_CONTRAST);
+    lcd_write(true, val);
+}
+#else
+void lcd_set_contrast(int val)
+{
+    lcd_write(true, LCD_CONTRAST_SET);
+    lcd_write(false, 31-val);
+}
+#endif
+#endif
 
 #if defined(HAVE_LCD_BITMAP) || defined(SIMULATOR) /* not CHARCELLS */
 
diff --git a/firmware/drivers/lcd.h b/firmware/drivers/lcd.h
index 145d858c54..2ce6339b8c 100644
--- a/firmware/drivers/lcd.h
+++ b/firmware/drivers/lcd.h
@@ -35,6 +35,7 @@ extern void lcd_puts_scroll(int x, int y, unsigned char* string );
 extern void lcd_icon(int icon, bool enable);
 extern void lcd_stop_scroll(void);
 extern void lcd_scroll_speed( int speed );
+extern void lcd_set_contrast(int val);
 
 #if defined(SIMULATOR) || defined(HAVE_LCD_BITMAP)
 extern void lcd_update(void);
-- 
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