From 57667c51cf09de052222484ce94fbd6da113a55c Mon Sep 17 00:00:00 2001
From: Rafaël Carré <rafael.carre@gmail.com>
Date: Wed, 6 Jan 2010 23:41:36 +0000
Subject: Sansa AMS: refactor DBOP button reading (e200v2/Fuze/c200v2)

This gets rid of LCD glitches on Sansa Fuze, and now LCD transfers can
get interrupted by button reading

Flyspray: FS #10603
Author: Bertrik Sikken

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24192 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/lcd-c200_c200v2.c | 74 +----------------------------------
 1 file changed, 2 insertions(+), 72 deletions(-)

(limited to 'firmware/target/arm/lcd-c200_c200v2.c')

diff --git a/firmware/target/arm/lcd-c200_c200v2.c b/firmware/target/arm/lcd-c200_c200v2.c
index 62f1dc20f6..45a37d9d7b 100644
--- a/firmware/target/arm/lcd-c200_c200v2.c
+++ b/firmware/target/arm/lcd-c200_c200v2.c
@@ -25,11 +25,8 @@
 #include "lcd.h"
 #include "kernel.h"
 #include "system.h"
-
 #ifdef SANSA_C200V2
-/* button driver needs to know if a lcd operation is in progress */
-static bool lcd_busy = false;
-static unsigned short dbop_input = 0xFFFF;
+#include "dbop-as3525.h"
 #endif
 
 /* Display status */
@@ -183,45 +180,6 @@ static inline void as3525_dbop_init(void)
     lcd_delay(20);
 }
 
-static unsigned short lcd_dbop_read(void)
-{
-    unsigned int dbop_ctrl_old = DBOP_CTRL;
-    unsigned int dbop_timpol23_old = DBOP_TIMPOL_23;
-    unsigned int value;
-    
-    /* make sure that the DBOP FIFO is empty */
-    while ((DBOP_STAT & (1<<10)) == 0);
-
-    /* write DBOP_DOUT to pre-charge DBOP data lines with a high level */
-    DBOP_TIMPOL_23 = 0xe167e167;    /* no strobe towards lcd */
-    DBOP_CTRL = (1 << 16) |         /* enw=1 (enable write) */
-                (1 << 12);          /* ow=1 (16-bit data width) */
-    DBOP_DOUT = 0xFFFF;             /* all pins high */
-    while ((DBOP_STAT & (1<<10)) == 0);
-
-    /* perform a DBOP read */
-    DBOP_CTRL = (1 << 15) |         /* strd=1 (start read) */
-                (1 << 12) |         /* ow=1 (16-bit data width) */
-                (31 << 0);          /* rs_t=31 (read DBOP at end of cycle) */
-    while ((DBOP_STAT & (1<<16)) == 0);
-    value = DBOP_DIN;
-    
-    /* restore previous values */
-    DBOP_TIMPOL_23 = dbop_timpol23_old;
-    DBOP_CTRL = dbop_ctrl_old;
-    
-    return value;
-}
-
-/* get the DBOP input value, either directly or cached if DBOP is busy */
-unsigned short int lcd_dbop_input(void)
-{
-    if (!lcd_busy) {
-        dbop_input = lcd_dbop_read();
-    }
-    return dbop_input;
-}
-
 #endif
 
 /* LCD init */
@@ -292,13 +250,7 @@ int lcd_default_contrast(void)
 
 void lcd_set_contrast(int val)
 {
-#ifdef SANSA_C200V2
-    lcd_busy = true;
-#endif
     lcd_send_command(R_CONTRAST_CONTROL1, val);
-#ifdef SANSA_C200V2
-    lcd_busy = false;
-#endif
 }
 
 void lcd_set_invert_display(bool yesno)
@@ -313,9 +265,6 @@ void lcd_enable(bool yesno)
     if (yesno == is_lcd_enabled)
         return;
 
-#ifdef SANSA_C200V2
-    lcd_busy = true;
-#endif
     if ((is_lcd_enabled = yesno))
     {
         lcd_send_command(R_STANDBY_OFF, 0);
@@ -326,9 +275,6 @@ void lcd_enable(bool yesno)
     {
         lcd_send_command(R_STANDBY_ON, 0);
     }
-#ifdef SANSA_C200V2
-    lcd_busy = false;
-#endif
 }
 #endif
 
@@ -343,18 +289,12 @@ bool lcd_active(void)
 /* turn the display upside down (call lcd_update() afterwards) */
 void lcd_set_flip(bool yesno)
 {
-#ifdef SANSA_C200V2
-    lcd_busy = true;
-#endif
     lcd_send_command(R_DRIVER_OUTPUT_MODE, yesno ? 0x02 : 0x07);
-#ifdef SANSA_C200V2
-    lcd_busy = false;
-#endif
 }
 
 /*** update functions ***/
 
-#if MEMORYSIZE > 2
+#if MEMORYSIZE > 2  /* not for C200V2 */
 void lcd_yuv_set_options(unsigned options)
 {
     lcd_yuv_options = options;
@@ -450,12 +390,6 @@ void lcd_update_rect(int x, int y, int width, int height)
 
     addr = &lcd_framebuffer[y][x];
 
-#ifdef SANSA_C200V2
-    lcd_busy = true;
-    /* perform a dbop read before doing a potentially lengthy lcd update */
-    dbop_input = lcd_dbop_read();
-#endif
-
     if (width <= 1) {
         /* The X end address must be larger than the X start address, so we
          * switch to vertical mode for single column updates and set the
@@ -476,8 +410,4 @@ void lcd_update_rect(int x, int y, int width, int height)
         lcd_write_data(addr, width);
         addr += LCD_WIDTH;
     } while (--height > 0);
-
-#ifdef SANSA_C200V2
-    lcd_busy = false;
-#endif
 }
-- 
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