液晶屏TFT问题

小弟请教过路的高手帮我看看这个程序，买了一个2.0寸的屏，弄了个程序点不亮 。接口是用的4SPI接口的 。
//***********************指令*****************************
void write_command (unsigned char y) // (uchar y,uchar x)
{
  unsigned char i;
  cs=0;
  rs=0;
  for(i=0;i<8;i++)
    {
     scl=0;
      if (y&0x80)
          sdi=1;
          else
          sdi=0;
       scl=1;
      y=y<<1;
    }
cs=1;
}
//************************************数据***************************
void write_data(unsigned char w) // (uchar w, uchar v)
{
  unsigned char i;
cs=0;
rs=1;
for(i=0;i<16;i++)
{
  scl=0;
     if ((w&0x8000)==0x8000)
        sdi=1;
         else
         sdi=0;
        scl=1;
      w=w<<1;
    }
cs=1;
}  /*
//*********************************送显示数据
void write_data2(unsigned char data3,unsigned char data4)
{
  unsigned char a,i,b;
   cs=0;
   rs=1;
   a=data3;
   for(i=0;i<8;i++)
     {
        scl=0;
        if (a&0x80)
         sdi=1;
          else
         sdi=0;
        scl=1;
       a=a<<1;
     }
   cs=1;
   cs=0;  
   b=data4;
   for(i=0;i<8;i++)
     {
      scl=0;
      if (b&0x80)
        sdi=1;
          else
         sdi=0;
        scl=1;
   b=b<<1;
     }
cs=1;
}          */
//*******************color***********************
void display_rgb(unsigned char data1)
{
   unsigned int i,j;
   write_command(0x22);
   for(i=0;i<176;i++)
   for(j=0;j<220;j++)
     {
        write_data(data1);
     }
}

void initi(void)
{
   res=1;
   delay(10);
   res=0;
   delay(10);
   res=1;
   delay(120);
write_command(0xd0);write_data(0x0003); // set SS and NL bit
write_command(0xeb);write_data(0x0b00); // set 1 line inversion
write_command(0xec);write_data(0x000f); // set GRAM write direction and
write_command(0xc7);write_data(0x030f); // set GRAM write direction and
write_command(0x01);write_data(0x011C); // set SS and NL bit
write_command(0x02);write_data(0x0100); // set 1 line inversion
write_command(0x03);write_data(0x1030); //
write_command(0x07);write_data(0x0000);
write_command(0x08);write_data(0x0808); //
write_command(0x0F);write_data(0x0601); //

write_command(0x10);write_data(0x0A00); //
write_command(0x11);write_data(0x1B41); //
delay(50);
write_command(0x12);write_data(0x200E); //
write_command(0x13);write_data(0x0020); // Set GVDD 52 30
write_command(0x14);write_data(0x4A5F); // Set VCOMH/VCOML voltage 5f60

write_command(0x30);write_data(0x0000);
write_command(0x31);write_data(0x00DB);
write_command(0x32);write_data(0x0000);
write_command(0x33);write_data(0x0000);
write_command(0x34);write_data(0x00DB);
write_command(0x35);write_data(0x0000);
write_command(0x36);write_data(0x00AF);
write_command(0x37);write_data(0x0000);
write_command(0x38);write_data(0x00DB);
write_command(0x39);write_data(0x0000);

write_command(0x50);write_data(0x0000);
write_command(0x51);write_data(0x0803);
write_command(0x52);write_data(0x0C07);
write_command(0x53);write_data(0x0501);
write_command(0x54);write_data(0x070C);
write_command(0x55);write_data(0x0308);
write_command(0x56);write_data(0x0000);
write_command(0x57);write_data(0x0105);
write_command(0x58);write_data(0x1100);
write_command(0x59);write_data(0x0011);

write_command(0x20);write_data(0x0000); // Set GRAM Address
write_command(0x21);write_data(0x0000); // Set GRAM Address
write_command(0x07);write_data(0x1017);
write_command(0x22);
}
  void  MCUinit(void)
{
    unsigned char n;
        PCA0MD &= ~0x40;

        //OSC
    OSCICN = 0x83;           //Internal oscillator enabled, SYSCLK = Internal Oscillator = 12MHz
    CLKMUL = 0x00;    //Select internal oscillator as clock multiplier source clock

    CLKMUL |= 0x80;   //Enable clock multiplier

        for(n=0;n<255;n++);

        CLKMUL |= 0xC0;           //Initialize the clock multiplier
        while(!(CLKMUL & 0x20));  //Wait for multiplier to lock
    CLKSEL = 0x00;            //Change SYSCLK to (4x Multiplier    ) = 48MHz  (48MHz is as fast as F34 will run); 0x03;

    RSTSRC   |= 0x02;  

        //P0~P4                                         //set high impedance ,        skipped by cros***ar
        P0MDIN |= 0xFF;          //数字输入(无模拟输入）
        P0MDOUT |= 0xFF;                  //推挽输出（可选开漏输出，输出设为推挽，输入设为开漏）

    P1MDOUT |= 0xFF;         
    P1MDIN |= 0xFF;

    P2MDOUT |= 0xFF;                                
        P4MDOUT |= 0xFF;         

        P3MDIN |= 0xFF;
        P3MDOUT |= 0x17;                 //0001 0111

    XBR0     |= 0x02;
    XBR1     |= 0x40;       // Enable Cros***ar

}

//************************************************************************
void main (void)
{
  MCUinit();
   initi();  
  delay(200);

   while(1)
   {        
      display_rgb(0x0000);
       delay(1000);

               
         display_rgb(0xffff);
        delay(1000);
           
                 
        display_rgb(0xf800);
        delay(1000);

               
        display_rgb(0x07e0);
        delay(1000);


      }      
   }
/*************************************************************************/