From 05fdb1ad30bbeeabe3cb74f4f5d366a53c8f3cef Mon Sep 17 00:00:00 2001
From: Miika Pekkarinen <miipekk@ihme.org>
Date: Sat, 19 Nov 2005 07:58:20 +0000
Subject: Added option to reduce (and almost prevent) the remote lcd ticking
 problem with a cost slightly more CPU usage.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7985 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/lcd-h100-remote.c | 18 +++++++++++++++---
 firmware/export/lcd-remote.h       |  1 +
 2 files changed, 16 insertions(+), 3 deletions(-)

(limited to 'firmware')

diff --git a/firmware/drivers/lcd-h100-remote.c b/firmware/drivers/lcd-h100-remote.c
index aaf8a1e..221338b 100644
--- a/firmware/drivers/lcd-h100-remote.c
+++ b/firmware/drivers/lcd-h100-remote.c
@@ -61,7 +61,11 @@
 #define RS_HI      or_l(0x00010000, &GPIO_OUT)
 
 /* delay loop */
-#define DELAY   do { int _x; for(_x=0;_x<3;_x++);} while (0)
+#define DELAY_DEFAULT   do { int _x = 0; for (_x = 0;_x < 2;_x++); } while (0)
+#define DELAY_EMIREDUCE do { int _x = cpu_frequency >> 21; while (_x--); } \
+                            while (0)
+#define DELAY   do { if (emireduce) DELAY_EMIREDUCE; \
+                    else DELAY_DEFAULT; } while (0)
 
 #define SCROLLABLE_LINES 13
 
@@ -77,6 +81,9 @@ static int curfont = FONT_SYSFIXED;
 #ifndef SIMULATOR
 static int xoffset; /* needed for flip */
 
+/* If set to true, will prevent "ticking" to headphones. */
+static bool emireduce = false;
+
 /* remote hotplug */
 static int countdown;  /* for remote plugging debounce */
 static bool last_remote_status = false;
@@ -177,7 +184,7 @@ void lcd_remote_write_data(const unsigned char* p_bytes, int count)
                 CLK_HI;
                 data <<= 1;
                 DELAY;
-            
+                
                 CLK_LO;
             }
         }
@@ -343,6 +350,11 @@ int lcd_remote_default_contrast(void)
 
 #ifndef SIMULATOR
 
+void lcd_remote_emireduce(bool state)
+{
+    emireduce = state;
+}
+
 void lcd_remote_powersave(bool on)
 {
     if (remote_initialized)
@@ -476,7 +488,7 @@ static void remote_tick(void)
             }
         }
     }
-}  
+}
 #endif /* !SIMULATOR */
 
 /* LCD init */
diff --git a/firmware/export/lcd-remote.h b/firmware/export/lcd-remote.h
index bc7f84c..6d5091f 100644
--- a/firmware/export/lcd-remote.h
+++ b/firmware/export/lcd-remote.h
@@ -34,6 +34,7 @@ extern void lcd_remote_backlight_on(void);
 extern void lcd_remote_backlight_off(void);
 extern int  lcd_remote_default_contrast(void);
 extern void lcd_remote_set_contrast(int val);
+extern void lcd_remote_emireduce(bool state);
 
 extern void lcd_remote_clear_display(void);
 extern void lcd_remote_puts(int x, int y, const unsigned char *string);
-- 
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