Graphikchip SSD1963: Weiß geht nicht

[Joachim .. (joachim_01)]

Moin,

hab hiern SSD1963 für ein 272x480 LCD im 565RGB Modus (16bit Busbreite) 
der an nem Cortex M3 hängt. Das Display funktioniert eigentlich nicht 
schlecht, aber es scheint als ob mindestens weiß (0xFFFF) rumzickt und 
den Controller gelegentlich völlig durcheinander bringt. Nach der 
Initialisierung kommt statt weiß nur knallbuntes Rauschen (nicht 
formatierter internes RAM des SSD1963?), danach wird weiß, jedesmal 
durch schwarz (0000) ersetzt, dargestellt.
Textfonts funktionieren, HW-mäßig scheint also alles ok zu sein. Der 
hier gepostete Init Code ist aus unbekannter chinesischer Quelle und war 
ursprünglich für nen ollen 8051 gedacht.

uint32_t HDP = 479;
uint32_t HT = 531;  //horiz. total period (display + non-display) in pixel clocks 
uint32_t HPS = 43;  //byte of the non-display period between the start of the horiz. sync (LLINE) signal and first
                    //display data = "hor. back porch + hor. pulse width?"
uint32_t LPS = 8;   //horizontal sync pulse (LLINE) start location in pixel clocks = "front porch?"
uint32_t HPW = 10;  //horizontal sync pulse width (= (HPW + 1) pixels )
uint32_t VDP = 271;
uint32_t VT = 288;
uint32_t VPS = 12; //Vertical Sync Pulse Width = (VPW + 1) lines 
uint32_t FPS = 4;  //vertical sync pulse (LFRAME) start location in lines.
uint32_t VPW = 10;


void Lcd_Init(void)
 {
   gpio_set_pin_high(LCD_CS); // LCD_CS = 1;
   gpio_set_pin_high(LCD_RD);
   gpio_set_pin_high(LCD_WR);   
   
   gpio_set_pin_high(LCD_RES);
   mdelay(100);
   gpio_set_pin_low(LCD_RES);
   mdelay(5);   
   gpio_set_pin_high(LCD_RES);
   mdelay(5);
   gpio_set_pin_high(LCD_CS);
   //gpio_set_pin_high(LCD_RD);
   //gpio_set_pin_high(LCD_WR);
   mdelay(5);
   
   gpio_set_pin_low(LCD_CS);

  LCD_WR_REG(0x00E2);    //PLL multiplier, set PLL clock to 120M
//    LCD_WR_DATA(0x002d);  //N=0x36 for 6.5M, 0x23 for 10M crystal
    LCD_WR_DATA(0x0023);  //N=0x36 for 6.5M, 0x23 for 10M crystal
    LCD_WR_DATA(0x0002);
    LCD_WR_DATA(0x0004);
    mdelay(1);

  LCD_WR_REG(0x00E0);
  LCD_WR_DATA(0x0001);  // 03
  mdelay(10);


  LCD_WR_REG(0x00E0);
    LCD_WR_DATA(0x0003);  // 03
    mdelay(10);

  LCD_WR_REG(0x0001);    // software reset
    mdelay(100);

  LCD_WR_REG(0x00E6);    //PLL setting for PCLK, depends on resolution
    LCD_WR_DATA(0x0000);
    LCD_WR_DATA(0x00ff);
    LCD_WR_DATA(0x00be);  
     
   LCD_WR_REG(0x00B0);  //LCD SPECIFICATION
     LCD_WR_DATA(0x0020);  //24bit to panel
     LCD_WR_DATA(0x0000);
     LCD_WR_DATA((HDP>>8)&0X00FF);  //Set HDP
     LCD_WR_DATA(HDP&0X00FF);
     LCD_WR_DATA((VDP>>8)&0X00FF);  //Set VDP
     LCD_WR_DATA(VDP&0X00FF);
     LCD_WR_DATA(0x0000);
     mdelay(5);
  
   LCD_WR_REG(0x00B4);  //HSYNC   ///531[d] = 213[h] 
     LCD_WR_DATA((HT>>8) & 0x00FF);  //Set HT    2     
     LCD_WR_DATA(HT & 0x00FF);
     LCD_WR_DATA((HPS>>8) & 0x00FF);  //Set HPS
     LCD_WR_DATA(HPS&0X00FF);
     LCD_WR_DATA(HPW);         //Set HPW
     LCD_WR_DATA((LPS>>8)&0X00FF);  //SetLPS
     LCD_WR_DATA(LPS&0X00FF);
     LCD_WR_DATA(0x0000);

   LCD_WR_REG(0x00B6);  //VSYNC
    LCD_WR_DATA((VT>>8)&0X00FF);   //Set VT
    LCD_WR_DATA(VT&0X00FF);
    LCD_WR_DATA((VPS>>8)&0X00FF);  //Set VPS
    LCD_WR_DATA(VPS&0X00FF);
    LCD_WR_DATA(VPW);         //Set VPW
    LCD_WR_DATA((FPS>>8)&0X00FF);  //Set FPS
    LCD_WR_DATA(FPS&0X00FF);


   LCD_WR_REG(0x0036); //rotation
    LCD_WR_DATA(0x0000);

  LCD_WR_REG(0x3A);  //Set Pixel Format
    LCD_WR_DATA(0x50);


   LCD_WR_REG(0x00F0); //pixel data interface
    LCD_WR_DATA(0x0003);  // width: 16-bit (565 format) 

   mdelay(5);

   LCD_WR_REG(0x0029); //display on

   LCD_WR_REG(0x00BE); //set PWM for B/L
    LCD_WR_DATA(0x0006);
    LCD_WR_DATA(0x00f0);
    LCD_WR_DATA(0x0001);
    LCD_WR_DATA(0x00f0);
    LCD_WR_DATA(0x0000);
    LCD_WR_DATA(0x0000);

   LCD_WR_REG(0x00d0);
    LCD_WR_DATA(0x000d);

   //----------LCD RESET---GPIO0-------------------//
   LCD_WR_REG(0x00B8);
    LCD_WR_DATA(0x0000);    //GPIO3=input, GPIO[2:0]=output
    LCD_WR_DATA(0x0001);    //GPIO0 normal

   LCD_WR_REG(0x00BA);
    LCD_WR_DATA(0x0000);
 }