From c0e898ae2983d36f6f58f26b25f543c69d281457 Mon Sep 17 00:00:00 2001
From: Frank Gevaerts <frank@gevaerts.be>
Date: Tue, 16 Sep 2008 16:51:25 +0000
Subject: Now reads the LCD controller ID succesfully and flashes it using the
 backlight

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18531 a1c6a512-1295-4272-9138-f99709370657
---
 bootloader/meizu_m6sl.c                           |  34 ++++++-
 firmware/target/arm/s5l8700/meizu-m6sl/lcd-m6sl.c | 104 ++++++++++++++++++++++
 2 files changed, 134 insertions(+), 4 deletions(-)

diff --git a/bootloader/meizu_m6sl.c b/bootloader/meizu_m6sl.c
index 442a0f9e18..86c4c5731e 100644
--- a/bootloader/meizu_m6sl.c
+++ b/bootloader/meizu_m6sl.c
@@ -77,9 +77,10 @@ void bl_debug(bool bit)
     }
 }
 
-void bl_debug_int(unsigned int input)
+void bl_debug_count(unsigned int input)
 {
     unsigned int i;
+    delay(SHORT_DELAY*3);
     for (i = 0; i < input; i++)
     {
         PDAT0 ^= (1 << 2); //Toggle backlight
@@ -87,12 +88,26 @@ void bl_debug_int(unsigned int input)
         PDAT0 ^= (1 << 2); //Toggle backlight
         delay(2*SHORT_DELAY);
     }
+}
+void bl_debug_int(unsigned int input,unsigned int count)
+{
+    unsigned int i;
+    for (i = 0; i < count; i++)
+    {
+        bl_debug(input>>i & 1);
+    }
     delay(SHORT_DELAY*6);
 }
 
+/* These functions are supposed to be static in lcd-m6sl.c, but
+   we use them here for testing */
+void init_lcd_spi(void);
+unsigned int lcd_read_id(void);
+
 void main(void)
 {
     //Set backlight pin to output and enable
+    unsigned int model;
     int oldval = PCON0;
     PCON0 = ((oldval & ~(3 << 4)) | (1 << 4));
     PDAT0 |= (1 << 2);
@@ -108,9 +123,18 @@ void main(void)
     // Wait for play to be released
     while((PDAT1 & (1 << 4)));
     PDAT0 ^= (1 << 2); //Toggle backlight
+    delay(LONG_DELAY);
+
+    init_lcd_spi();
+    model=lcd_read_id();
+    bl_debug_count((model&0xf000)>>12);
+    bl_debug_count((model&0xf00)>>8);
+    bl_debug_count((model&0xf0)>>4);
+    bl_debug_count(model&0xf);
 
     /* Calibrate the lot */
-    qt1106_io(QT1106_MODE_FREE | QT1106_MOD_INF | QT1106_DI | QT1106_SLD_SLIDER | QT1106_CAL_WHEEL | QT1106_CAL_KEYS | QT1106_RES_4);
+    qt1106_io(QT1106_MODE_FREE | QT1106_MOD_INF | QT1106_DI \
+       | QT1106_SLD_SLIDER | QT1106_CAL_WHEEL | QT1106_CAL_KEYS | QT1106_RES_4);
 
     /* Set to maximum sensitivity */
     qt1106_io(QT1106_CT | (0x00 << 8) );
@@ -119,8 +143,10 @@ void main(void)
     {
         qt1106_wait();
 
-        int slider = qt1106_io(QT1106_MODE_FREE | QT1106_MOD_INF | QT1106_DI | QT1106_SLD_SLIDER | QT1106_RES_4);
-        bl_debug_int(((slider&0xff)) + 1);
+        int slider = qt1106_io(QT1106_MODE_FREE | QT1106_MOD_INF \
+            | QT1106_DI | QT1106_SLD_SLIDER | QT1106_RES_4);
+        if(slider & 0x008000)
+            bl_debug_count(((slider&0xff)) + 1);
     }
 
     //power off
diff --git a/firmware/target/arm/s5l8700/meizu-m6sl/lcd-m6sl.c b/firmware/target/arm/s5l8700/meizu-m6sl/lcd-m6sl.c
index 1affab3b01..567023d35e 100644
--- a/firmware/target/arm/s5l8700/meizu-m6sl/lcd-m6sl.c
+++ b/firmware/target/arm/s5l8700/meizu-m6sl/lcd-m6sl.c
@@ -29,6 +29,110 @@
 /*** definitions ***/
 
 
+#define SPIDELAY(_x) void(_x);
+
+#define SETMOSI() (PDAT4 |= (1 << 3))
+#define CLRMOSI() (PDAT4 &= ~(1 << 3))
+
+#define MISO ((PDAT1 >> 1) & 1)
+
+#define SETCLK() (PDAT4 |= (1 << 2))
+#define CLRCLK() (PDAT4 &= ~(1 << 2))
+
+#define SETSS() (PDAT7 |= (1 << 1))
+#define CLRSS() (PDAT7 &= ~(1 << 1))
+
+void init_lcd_spi(void)
+{
+    int oldval;
+
+    oldval = PCON1;
+    //Set P1.1 to input
+    PCON1 = ((oldval & ~(0xf << 4)));
+
+    oldval = PCON4;
+    //Set P4.2 and 4.3 to output
+    PCON4 = ((oldval & ~(0xf << 8 | 0xf << 12)) | (1 << 8 | 1 << 12));
+
+    oldval = PCON4;
+    //Set P4.2 and 4.3 to output
+    PCON4 = ((oldval & ~(0xf << 8 | 0xf << 12)) | (1 << 8 | 1 << 12));
+
+    oldval = PCON7;
+    //Set P7.0 and 7.1 to output
+    PCON7 = ((oldval & ~(0xf << 0 | 0xf << 4)) | (1 << 0 | 1 << 4));
+
+    SETSS();
+    SETCLK();
+}
+
+static inline void delay(int duration)
+{
+    volatile int i;
+    for(i=0;i<duration;i++);
+}
+
+unsigned int lcd_spi_io(unsigned int output,unsigned int bits,unsigned int inskip)
+{
+    unsigned int input = 0;
+    unsigned int i;
+
+    //delay(10);  // < 470 us
+
+    CLRSS();
+    //delay(13); // > 22 us
+
+    for (i = 0; i < bits+inskip; i++) {
+
+        CLRCLK();
+
+        if(i<bits)
+        {
+            if (output & (1 << (bits-1)))
+                SETMOSI();
+            else
+                CLRMOSI();
+            output <<= 1;
+        }
+        else
+        {
+            CLRMOSI();
+        }
+
+        //delay(20); // >> 6.7 us
+
+        SETCLK();
+
+        if(i>=inskip)
+        {
+            input <<= 1;
+            input |= MISO;
+        }
+
+        //delay(20); // >> 6.7 us
+    }
+
+    SETSS();
+
+    return (input);
+}
+
+
+void spi_set_reg(unsigned char reg,unsigned short value)
+{
+    lcd_spi_io(0x700000|reg,24,0); // possibly 0x74
+    lcd_spi_io(0x720000|value,24,0); // possibly 0x77
+}
+
+unsigned int lcd_read_id(void)
+{
+    unsigned int device_code;
+    lcd_spi_io(0x700000,24,0); // possibly 0x74
+
+    device_code=lcd_spi_io(0x7300,16,24); // possibly 0x77
+    return device_code;
+}
+
 /** globals **/
 
 static int xoffset; /* needed for flip */
-- 
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