Patch No 1387627 by Peter D'Hoye: Backlight Brightness setting for H300

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8280 a1c6a512-1295-4272-9138-f99709370657

apps/lang/english.lang

@@ -3550,3 +3550,10 @@ desc: in radio screen / menu
 eng: "Mode:"
 voice: ""
 new:
+
+id: LANG_BRIGHTNESS
+desc: in settings_menu
+eng: "Brightness"
+voice: "Brightness"
+new:
+

apps/settings.c

@@ -488,6 +488,10 @@ static const struct bit_entry hd_bits[] =
 #endif
     {4, S_O(default_codepage), 0, "default codepage", "iso8859-1,iso8859-7,iso8859-8,cp1251,iso8859-11,iso8859-6,iso8859-9,iso8859-2,sjis,gb2312,ksx1001,big5,utf-8" },
     
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+    {4, S_O(brightness), 9, "brightness", "2,3,4,5,6,7,8,9,10,11,12,13,14,15"},
+#endif
+
     /* If values are just added to the end, no need to bump the version. */
     /* new stuff to be added at the end */
 
@@ -891,6 +895,9 @@ void settings_apply(void)
     backlight_set_fade_in(global_settings.backlight_fade_in);
     backlight_set_fade_out(global_settings.backlight_fade_out);
 #endif
+#endif
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+    backlight_set_brightness(global_settings.brightness);
 #endif
     ata_spindown(global_settings.disk_spindown);
 #if (CONFIG_CODEC == MAS3507D) && !defined(SIMULATOR)

apps/settings.h

@@ -381,6 +381,10 @@ struct user_settings
 #ifdef HAVE_REMOTE_LCD
     unsigned char rwps_file[MAX_FILENAME+1];  /* last remote-wps */
 #endif
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS 
+    int brightness;         /* iriver h300: backlight PWM value: 2..15
+                                (0 and 1 are black) */
+#endif
 };
 
 enum optiontype { INT, BOOL };
@@ -442,6 +446,11 @@ extern const char rec_base_directory[];
 #endif
 #define MIN_CONTRAST_SETTING        5
 
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+#define MIN_BRIGHTNESS_SETTING      2
+#define MAX_BRIGHTNESS_SETTING      15
+#endif
+
 /* argument bits for settings_load() */
 #define SETTINGS_RTC 1 /* only the settings from the RTC nonvolatile RAM */
 #define SETTINGS_HD  2 /* only the settings fron the disk sector */

apps/settings_menu.c

@@ -214,6 +214,16 @@ static bool backlight_fade_out(void)
 #endif
 #endif /* CONFIG_BACKLIGHT */
 
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+static bool brightness(void)
+{
+    return set_int( str(LANG_BRIGHTNESS), "", UNIT_INT,
+                    &global_settings.brightness, 
+                    backlight_set_brightness, 1, MIN_BRIGHTNESS_SETTING,
+                    MAX_BRIGHTNESS_SETTING, NULL );
+}
+#endif
+
 #ifdef HAVE_REMOTE_LCD
 
 static bool remote_backlight_timer(void)
@@ -1525,6 +1535,9 @@ static bool lcd_settings_menu(void)
         { ID2P(LANG_BACKLIGHT_FADE_IN), backlight_fade_in },
         { ID2P(LANG_BACKLIGHT_FADE_OUT), backlight_fade_out },
 #endif
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+        { ID2P(LANG_BRIGHTNESS), brightness },
+#endif
 #endif /* CONFIG_BACKLIGHT */
         { ID2P(LANG_CONTRAST),        contrast },
 #ifdef HAVE_LCD_BITMAP

firmware/backlight.c

@@ -30,6 +30,10 @@
 #include "timer.h"
 #include "backlight.h"
 
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+#include "pcf50606.h" /* iRiver brightness */
+#endif
+ 
 #if CONFIG_BACKLIGHT == BL_IRIVER_H300
 #include "lcd.h" /* for lcd_enable() */
 #endif
@@ -538,3 +542,13 @@ void remote_backlight_set_timeout(int index) {(void)index;}
 #endif
 #endif /* #ifdef CONFIG_BACKLIGHT */
 
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+void backlight_set_brightness(int val)
+{
+    /* set H300 brightness by changing the PWM
+       accepts 0..15 but note that 0 and 1 give a black display! */
+    unsigned char ucVal = (unsigned char)(val & 0x0F);
+    pcf50606_set_bl_pwm(ucVal);
+}
+#endif
+

firmware/drivers/pcf50606.c

@@ -44,6 +44,7 @@
 /* delay loop to achieve 400kHz at 120MHz CPU frequency */
 #define DELAY    do { int _x; for(_x=0;_x<22;_x++);} while(0)
 
+void pcf50606_set_bl_pwm(unsigned char ucVal);
 
 static void pcf50606_i2c_start(void)
 {
@@ -281,5 +282,23 @@ void pcf50606_init(void)
     set_voltages();
 
     /* Backlight PWM = 512Hz 50/50 */
-    pcf50606_write(0x35, 0x13);
+    /*pcf50606_write(0x35, 0x13);*/
+    pcf50606_set_bl_pwm(9);
+}
+
+void pcf50606_set_bl_pwm(unsigned char ucVal)
+{
+    /* set the backlight PWM */
+    /* range is 0 - 15 */
+
+    /* limit incoming value */
+    ucVal = ucVal & 0x0F;   
+
+    /* shift one bit left */
+    ucVal = ucVal << 1;
+    ucVal = ucVal | 0x01;
+
+    /* 0x00 = 512Hz */
+    ucVal = ucVal | 0x00;   
+    pcf50606_write(0x35, ucVal);
 }

firmware/export/backlight.h

@@ -49,3 +49,7 @@ void sim_backlight(int value);
 void sim_remote_backlight(int value);
 #endif
 #endif
+
+#ifdef HAVE_BACKLIGHT_BRIGHTNESS
+void backlight_set_brightness(int val);
+#endif

firmware/export/config-h300.h

@@ -100,4 +100,6 @@
 #define BOOTFILE_EXT "iriver"
 #define BOOTFILE "rockbox." BOOTFILE_EXT
 
+#define HAVE_BACKLIGHT_BRIGHTNESS
+
 #endif

firmware/export/pcf50606.h

@@ -25,6 +25,7 @@ int pcf50606_write_multiple(int address, const unsigned char* buf, int count);
 int pcf50606_write(int address, unsigned char val);
 int pcf50606_read_multiple(int address, unsigned char* buf, int count);
 int pcf50606_read(int address);
+void pcf50606_set_bl_pwm(unsigned char ucVal);
 #endif
 
 #endif