vga.c

这是飞凌TE2410开发板的Bootloader源程序。

#include "iic.h"
#include "bootpara.h"


void _Delay(int time)
{
	volatile int i, j;

	for (i = 0; i < time * 512; i++)
		j = i;
}

//**********************[IicPoll ]**************************************
void _IicPoll(void)
{
    U32 iicSt,i;
    
    iicSt = rIICSTAT; 
    if(iicSt & 0x8){}                   //When bus arbitration is failed.
    if(iicSt & 0x4){}                   //When a slave address is matched with IICADD
    if(iicSt & 0x2){}                   //When a slave address is 0000000b
    if(iicSt & 0x1){}                   //When ACK isn't received

    switch(__iicMode)
    {
        case POLLACK:
            __iicStatus = iicSt;
            break;

        case RDDATA:
            if((__iicDataCount--)==0)
            {
                __iicData[__iicPt++] = rIICDS;
            
                rIICSTAT = 0x90;                //Stop MasRx condition 
                rIICCON  = 0xaf;                //Resumes IIC operation.
                _Delay(1);                       //Wait until stop condtion is in effect.
                                                //Too long time... 
                                                //The pending bit will not be set after issuing stop condition.
                break;    
            }      
            __iicData[__iicPt++] = rIICDS;
                        //The last data has to be read with no ack.
            if((__iicDataCount)==0)
                rIICCON = 0x2f;                 //Resumes IIC operation with NOACK.  
            else 
                rIICCON = 0xaf;                 //Resumes IIC operation with ACK
            break;

        case WRDATA:
            if((__iicDataCount--)==0)
            {
                rIICSTAT = 0xd0;                //stop MasTx condition 
                rIICCON  = 0xaf;                //resumes IIC operation.
                _Delay(1);                       //wait until stop condtion is in effect.
                       //The pending bit will not be set after issuing stop condition.
                break;    
            }
            rIICDS = __iicData[__iicPt++];        //_iicData[0] has dummy.
            for(i=0;i<10;i++);                  //for setup time until rising edge of IICSCL
            rIICCON = 0xaf;                     //resumes IIC operation.
            break;

        case SETRDADDR:
//          printk("[S%d]",_iicDataCount);
            if((__iicDataCount--)==0)
            {
                break;                  //IIC operation is stopped because of IICCON[4]    
            }
            rIICDS = __iicData[__iicPt++];
            for(i=0;i<10;i++);          //for setup time until rising edge of IICSCL
            rIICCON = 0xaf;             //resumes IIC operation.
            break;

        default:
            break;      
    }
}


//**********************[ Run_IicPoll ]*********************************
void _Run_IicPoll(void)
{
    if(rIICCON & 0x10)                  //Tx/Rx Interrupt Enable
       _IicPoll();
}       
    
void __Wr24C080(U32 slvAddr,U32 addr,U8 data)
{
   int times = 0;
   
    __iicMode      = WRDATA;
    __iicPt        = 0;
    __iicData[0]   = (U8)addr;
    __iicData[1]   = data;
    __iicDataCount = 2;

    if (__iic_error)
		return;
    
    rIICDS        = slvAddr;            //0xa0
      //Master Tx mode, Start(Write), IIC-bus data output enable
      //Bus arbitration sucessful, Address as slave status flag Cleared,
      //Address zero status flag cleared, Last received bit is 0
    rIICSTAT      = 0xf0;      
      //Clearing the pending bit isn't needed because the pending bit has been cleared.
    while(__iicDataCount!=-1)
       _Run_IicPoll();

    __iicMode = POLLACK;

    while(1)
    {
        rIICDS     = slvAddr;
        __iicStatus = 0x100;             //To check if _iicStatus is changed 
        rIICSTAT   = 0xf0;              //Master Tx, Start, Output Enable, Sucessful, Cleared, Cleared, 0
        rIICCON    = 0xaf;              //Resumes IIC operation. 
        while(__iicStatus==0x100 && times++ < 512)  
            _Run_IicPoll();

	 if (times > 512)
	 	__iic_error = 1;
        if(!(__iicStatus & 0x1) || __iic_error)
            break;                      //When ACK is received
    }
    rIICSTAT = 0xd0;                    //Master Tx condition, Stop(Write), Output Enable
    rIICCON  = 0xaf;                    //Resumes IIC operation. 
    _Delay(1);                           //Wait until stop condtion is in effect.
      //Write is completed.
}


void display_format(int mode)
{
	if(mode==2)
	{
		__Wr24C080(VGA_ADDR, 0x00, 0x61);
		__Wr24C080(VGA_ADDR, 0x04, 0x00);
		__Wr24C080(VGA_ADDR, 0x07, 0x64);
		__Wr24C080(VGA_ADDR, 0x08, 0x01);
		__Wr24C080(VGA_ADDR, 0x0a, 0x30);
		__Wr24C080(VGA_ADDR, 0x0b, 0x20);
		__Wr24C080(VGA_ADDR, 0x09, 0x69);
		__Wr24C080(VGA_ADDR, 0x0e, 0x0a);
		__Wr24C080(VGA_ADDR, 0x10, 0x00);
		__Wr24C080(VGA_ADDR, 0x3d, 0x00);
		__Wr24C080(VGA_ADDR, 0x01, 0x08);	

		__Wr24C080(VGA_ADDR, 0x1c, 0xe0);
		__Wr24C080(VGA_ADDR, 0x20, 0x0a);
		__Wr24C080(VGA_ADDR, 0x21, 0x01);
		__Wr24C080(VGA_ADDR, 0x24, 0x01);	
		
		__Wr24C080(VGA_ADDR, 0x04, 0x00);
	
	}
	else
	{
		__Wr24C080(VGA_ADDR, 0x04, 0x20);
	
	}
	if (__iic_error == 0)
		Uart_Printf(" |VGA init done!                                              |\n");

	else
		Uart_Printf(" |VGA init unsuccessful!!!                                    |\n");

	
}

int display_init()
{
	//int ret;
	unsigned value;
	
	IICCON = ACK_ENA | CLK_512 | 0xf;
    	rGPEUP  |= 0xc000;                  //Pull-up disable
    	rGPECON |= 0xa00000;                //GPE15:IICSDA , GPE14:IICSCL    

      //Enable ACK, Prescaler IICCLK=PCLK/16, Enable interrupt, Transmit clock value Tx clock=IICCLK/16
    	rIICCON  = (1<<7) | (0<<6) | (1<<5) | (0xf);
	
    	rIICADD  = 0x10;                    //2410 slave address = [7:1]
    	rIICSTAT = 0x10;                    //IIC bus data output enable(Rx/Tx)

#if 1
	BANKCON6=0x00018001;  //TRCD=4 clocks /SDRAM
	BANKCON7=0x00018001;  //TRCD=4 clocks /SDRAM
	//BANKCON6=0x00018001;  //TRCD=2 clocks /SDRAM
	//BANKCON7=0x00018001;  //TRCD=2 clocks /SDRAM	
	
	REFRESH=0x008e01e9;   //刷新时间为15.6us HCLK=@100M
	MRSRB6=0x20;   //CL=2HCLK
	MRSRB7=0x20;   //CL=2HCLK
#endif
    value = 1;
    if(boot_params.display_sel.val==2)value=2;//TV mode	
    __iic_error = 0;
    
	display_format(value);
}