Sansa Clip: grey lib support (not calibrated yet)

Declare HAVE_LCD_INVERT
Put the framebuffer into IRAM

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19249 a1c6a512-1295-4272-9138-f99709370657

5 files changed, 143 insertions, 13 deletions

diff --git a/apps/plugins/lib/grey_core.c b/apps/plugins/lib/grey_core.c
index 008104a04f..c4eb0fc080 100644
--- a/apps/plugins/lib/grey_core.c
+++ b/apps/plugins/lib/grey_core.c
@@ -207,6 +207,27 @@ static const unsigned char lcdlinear[256] = {
 };
 #define LCD_SCANRATE 51 /* Hz */
 
+#elif defined SANSA_CLIP /* NOT verified */
+static const unsigned char lcdlinear[256] = {
+  0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,  15,
+ 16,  17,  18,  19,  20,  21,  22,  23,  24,  25,  26,  27,  28,  29,  30,  31,
+ 32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,
+ 48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
+ 64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
+ 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
+ 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
+112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
+128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
+144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
+160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
+176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
+192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
+208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
+224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
+240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
+};
+#define LCD_SCANRATE 78 /* Hz */
+
 #else  /* not yet calibrated targets - generic linear mapping */
 /* TODO: calibrate iFP7xx */
 static const unsigned char lcdlinear[256] = {
diff --git a/firmware/SOURCES b/firmware/SOURCES
index 47dcfe5c86..9b576d435a 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -1068,6 +1068,7 @@ target/arm/pcm-telechips.c
 #ifdef SANSA_CLIP
 #ifndef SIMULATOR
 target/arm/as3525/sansa-clip/lcd-ssd1303.c
+target/arm/as3525/sansa-clip/lcd-as-clip.S
 target/arm/as3525/sansa-clip/button-clip.c
 target/arm/as3525/sansa-clip/backlight-clip.c
 target/arm/as3525/as3525-codec.c
diff --git a/firmware/export/config-clip.h b/firmware/export/config-clip.h
index 4266b59a7f..d54d4f3488 100644
--- a/firmware/export/config-clip.h
+++ b/firmware/export/config-clip.h
@@ -61,6 +61,9 @@
 /* define this if you can flip your LCD */
 #define HAVE_LCD_FLIP
 
+/* define this if you can invert the pixels */
+#define HAVE_LCD_INVERT
+
 /* Define this if your LCD can set contrast */
 #define HAVE_LCD_CONTRAST
 
@@ -68,7 +71,7 @@
 #define MAX_CONTRAST_SETTING        50
 #define DEFAULT_CONTRAST_SETTING    30
 
-/* #define IRAM_LCDFRAMEBUFFER IDATA_ATTR *//* put the lcd frame buffer in IRAM */
+#define IRAM_LCDFRAMEBUFFER IDATA_ATTR /* put the lcd frame buffer in IRAM */
 
 #define CONFIG_KEYPAD SANSA_CLIP_PAD
 
diff --git a/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S b/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S
new file mode 100644
index 0000000000..aab46861ba
--- /dev/null
+++ b/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S
@@ -0,0 +1,99 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 by Jens Arnold
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "as3525.h"
+
+    .text
+    .align      2
+
+    .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, =GPIOA_BASE
+    mov     r3, #(1<<5)
+    str     r3, [lr, #(4*(1<<5))] @ set pin D/C# of LCD controller (data)
+
+    ldr     lr, =DBOP_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}
+
+    orr     r7, r7, r7, lsl #8  @ we set 15:13 to the MSb and 3:0 to the LSb
+    strh    r7, [lr, #0x10]     @ DBOP_DOUT
+
+1:
+    ldr     r5, [lr, #0xC]      @ DBOP_STAT
+    ands    r5, r5, #(1<<10)    @ wait until push fifo empties
+    beq     1b
+
+    subs    r2, r2, #1
+    bne     .greyloop
+
+    ldmfd   sp!, {r4-r8, pc}
+    .size   lcd_grey_data,.-lcd_grey_data
diff --git a/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c b/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c
index f1e1c24b85..703b7e1307 100644
--- a/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c
+++ b/firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c
@@ -88,6 +88,7 @@ void lcd_write_command(int byte)
     GPIOA_PIN(5) = 0;
 
     /* Write command */
+    /* Only bits 15:12 and 3:0 of DBOP_DOUT are meaningful */
     DBOP_DOUT = (byte << 8) | byte;
 
     /* While push fifo is not empty */
@@ -103,6 +104,7 @@ void lcd_write_data(const fb_data* p_bytes, int count)
     while (count--)
     {
         /* Write pixels */
+        /* Only bits 15:12 and 3:0 of DBOP_DOUT are meaningful */
         DBOP_DOUT = (*p_bytes << 8) | *p_bytes;
 
         p_bytes++; /* next packed pixels */
@@ -266,26 +268,30 @@ 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)
 {
-    /* TODO */
-
-#if 0
     if(!display_on)
         return;
-#endif
-
-    (void)values;
-    (void)phases;
-    (void)x;
-    (void)by;
-    (void)width;
-    (void)bheight;
-    (void)stride;
+
+    stride <<= 3; /* 8 pixels per block */
+    /* Copy display bitmap to hardware */
+    while (bheight--)
+    {
+        lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
+        lcd_write_command (LCD_CNTL_HIGHCOL | (((x+2+xoffset)>>4) & 0xf));
+        lcd_write_command (LCD_CNTL_LOWCOL | ((x+2+xoffset) & 0xf));
+
+        lcd_grey_data(values, phases, width);
+
+        values += stride;
+        phases += stride;
+    }
 }
 
 /* Update the display.