Make the greyscale library work on the m:robe 100. Testing on target done by Robert Kukla & Dominik Riebeling.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17028 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/olympus/mrobe-100/lcd-as-mr100.S

@@ -0,0 +1,115 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 by Jens Arnold
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "cpu.h"
+
+    .text
+    .align      2
+
+
+    .global     lcd_write_data
+    .type       lcd_write_data,%function
+
+lcd_write_data:
+    str     lr, [sp, #-4]!
+    ldr     lr, =LCD1_BASE
+
+.loop:
+    ldrb    r2, [r0], #1
+1:
+    ldr     r3, [lr]
+    tst     r3, #LCD1_BUSY_MASK
+    bne     1b
+    str     r2, [lr, #0x10]
+
+    subs    r1, r1, #1
+    bne     .loop
+
+    ldr     pc, [sp], #4
+    .size   lcd_write_data,.-lcd_write_data
+
+
+    .global     lcd_grey_data
+    .type       lcd_grey_data,%function
+
+/* A high performance function to write grey phase data to the display,
+ * one or multiple pixels.
+ *
+ * Arguments:
+ *   r0 - pixel value data address
+ *   r1 - pixel phase data address
+ *   r2 - pixel block count
+ *
+ * Register usage:
+ *   r3/r4 - current block of phases
+ *   r5/r6 - current block of values
+ *   r7 - lcd data accumulator
+ *   r8 - phase signs mask
+ *   lr - lcd bridge address
+ */
+ 
+lcd_grey_data:
+    stmfd   sp!, {r4-r8, lr}
+    mov     r8, #0x80
+    orr     r8, r8, r8, lsl #8
+    orr     r8, r8, r8, lsl #16
+    ldr     lr, =LCD1_BASE
+
+.greyloop:
+    ldmia   r1, {r3-r4}         /* Fetch 8 pixel phases */
+    ldmia   r0!, {r5-r6}        /* Fetch 8 pixel values */
+
+    mov     r7, #0xff
+    tst     r3, #0x80
+    biceq   r7, r7, #0x80
+    tst     r3, #0x8000
+    biceq   r7, r7, #0x40
+    tst     r3, #0x800000
+    biceq   r7, r7, #0x20
+    tst     r3, #0x80000000
+    biceq   r7, r7, #0x10
+    bic     r3, r3, r8
+    add     r3, r3, r5
+
+    tst     r4, #0x80
+    biceq   r7, r7, #0x08
+    tst     r4, #0x8000
+    biceq   r7, r7, #0x04
+    tst     r4, #0x800000
+    biceq   r7, r7, #0x02
+    tst     r4, #0x80000000
+    biceq   r7, r7, #0x01
+    bic     r4, r4, r8
+    add     r4, r4, r6
+
+    stmia   r1!, {r3-r4}
+
+1:
+    ldr     r5, [lr]
+    tst     r5, #LCD1_BUSY_MASK
+    bne     1b
+    str     r7, [lr, #0x10]
+
+    subs    r2, r2, #1
+    bne     .greyloop
+
+    ldmfd   sp!, {r4-r8, pc}
+    .size   lcd_grey_data,.-lcd_grey_data
+

firmware/target/arm/olympus/mrobe-100/lcd-mr100.c

@@ -76,17 +76,6 @@ void lcd_write_command(int byte)
     LCD1_CMD = byte;
 }
 
-/* send LCD data */
-
-void lcd_write_data(const fb_data* p_bytes, int count)
-{
-    while (count--)
-    {
-        while (LCD1_CONTROL & LCD1_BUSY_MASK); /* wait for LCD */
-        LCD1_DATA = *(p_bytes++);
-    }    
-}
-
 static int xoffset; /* needed for flip */
 
 /*** hardware configuration ***/
@@ -146,8 +135,7 @@ void lcd_init_device(void)
     LCD1_CONTROL |= 0x4;
     udelay(10);
 
-    LCD1_CONTROL = 0x690;
-    LCD1_CONTROL = 0x694;
+    LCD1_CONTROL = 0x0094;
 
     /* OF just reads these */
     LCD1_CONTROL;
@@ -206,18 +194,30 @@ void lcd_blit_mono(const unsigned char* data, int x, int by, int width,
     }
 }
 
+/* Helper function for lcd_grey_phase_blit(). */
+void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
+
 /* Performance function that works with an external buffer
    note that by and bheight are in 8-pixel units! */
 void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
                          int x, int by, int width, int bheight, int stride)
 {
-    (void)values;
-    (void)phases;
-    (void)x;
-    (void)by;
-    (void)width;
-    (void)bheight;
-    (void)stride;
+    int cmd1, cmd2;
+
+    stride <<= 3;  /* 8 pixels per block */
+    cmd1 = LCD_CNTL_HIGHCOL | (((x + xoffset) >> 4) & 0xf);
+    cmd2 = LCD_CNTL_LOWCOL | ((x + xoffset) & 0xf);
+
+    while (bheight--)
+    {
+        lcd_write_command(LCD_CNTL_PAGE | (by++ & 0xff));
+        lcd_write_command(cmd1);
+        lcd_write_command(cmd2);
+
+        lcd_grey_data(values, phases, width);
+        values += stride;
+        phases += stride;
+    }
 }
  
 /* Update the display.