From 9b83c6c4bddca41411d31b8aab17ecc577b37eb4 Mon Sep 17 00:00:00 2001
From: Hristo Kovachev <bger@rockbox.org>
Date: Thu, 22 Dec 2005 10:43:36 +0000
Subject: 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
---
 firmware/backlight.c          | 14 ++++++++++++++
 firmware/drivers/pcf50606.c   | 21 ++++++++++++++++++++-
 firmware/export/backlight.h   |  4 ++++
 firmware/export/config-h300.h |  2 ++
 firmware/export/pcf50606.h    |  1 +
 5 files changed, 41 insertions(+), 1 deletion(-)

(limited to 'firmware')

diff --git a/firmware/backlight.c b/firmware/backlight.c
index 291c5da8e7..d118830721 100644
--- a/firmware/backlight.c
+++ b/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
+
diff --git a/firmware/drivers/pcf50606.c b/firmware/drivers/pcf50606.c
index b99b2e9e88..cb05d25345 100644
--- a/firmware/drivers/pcf50606.c
+++ b/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);
 }
diff --git a/firmware/export/backlight.h b/firmware/export/backlight.h
index 9c3f5aa90b..f4c62a2028 100644
--- a/firmware/export/backlight.h
+++ b/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
diff --git a/firmware/export/config-h300.h b/firmware/export/config-h300.h
index 20e27c505b..54a2ef543f 100644
--- a/firmware/export/config-h300.h
+++ b/firmware/export/config-h300.h
@@ -100,4 +100,6 @@
 #define BOOTFILE_EXT "iriver"
 #define BOOTFILE "rockbox." BOOTFILE_EXT
 
+#define HAVE_BACKLIGHT_BRIGHTNESS
+
 #endif
diff --git a/firmware/export/pcf50606.h b/firmware/export/pcf50606.h
index fd180bfaee..daacbac725 100644
--- a/firmware/export/pcf50606.h
+++ b/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
-- 
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