lcdlib.c

s3c44b0芯片的一个lcd实用例子

#include <string.h>
#include "44b.h"
#include "44blib.h"
#include "def.h"
#include "lcd.h"
#include "lcdlib.h"
#include "glib.h"

unsigned int (*frameBuffer1)[SCR_XSIZE/32];
unsigned int (*frameBuffer4)[SCR_XSIZE/16];
void Lcd_Init(int depth)
{
    //320x240 1bit/1pixel LCD
    rPCONC=0x0f05ff55;	
	rPCOND=0xaaaa;
    switch(depth)
    {
    case 1:    
	if((U32)frameBuffer1==0)
	{
	    frameBuffer1=(unsigned int (*)[SCR_XSIZE/32])malloc(ARRAY_SIZE_MONO); 
	}
	rLCDCON1=(0)|(1<<5)|(MVAL_USED<<7)|(0x1<<8)|(0x1<<10)|(CLKVAL_MONO<<12);
	//disable,8B_SNGL_SCAN,WDLY=8clk,WLH=8clk,
	rLCDCON2=(LINEVAL)|(HOZVAL<<10)|(10<<21);  
	//LINEBLANK=10 (without any calculation) 
	rLCDSADDR1= (0x0<<27) | ( ((U32)frameBuffer1>>22)<<21 ) | M5D((U32)frameBuffer1>>1);
	//monochrome, LCDBANK, LCDBASEU
	rLCDSADDR2= M5D( (((U32)frameBuffer1+(SCR_XSIZE*LCD_YSIZE)/8)>>1) ) | (MVAL<<21);
	rLCDSADDR3= (LCD_XSIZE/16) | ( ((SCR_XSIZE-LCD_XSIZE)/16)<<9 );
	rLCDCON1=(1)|(1<<5)|(MVAL_USED<<7)|(0x1<<8)|(0x1<<10)|(CLKVAL_MONO<<12);
	//enable,4B_SNGL_SCAN,WDLY=8clk,WLH=8clk,
	break;
    case 4:
	if((U32)frameBuffer4==0)
	{
	    frameBuffer4=(unsigned int (*)[SCR_XSIZE/16])malloc(ARRAY_SIZE_G4); 
	}
	rLCDCON1=(0)|(1<<5)|(MVAL_USED<<7)|(0x3<<8)|(0x3<<10)|(CLKVAL_G4<<12);
	// disable,4B_SNGL_SCAN,WDLY=8clk,WLH=8clk,
	rLCDCON2=(LINEVAL)|(HOZVAL<<10)|(10<<21);  
	//LINEBLANK=10 (without any calculation) 
	rLCDSADDR1= (0x1<<27) | ( ((U32)frameBuffer4>>22)<<21 ) | M5D((U32)frameBuffer4>>1);
	// 4-gray, LCDBANK, LCDBASEU
	rLCDSADDR2= M5D((((U32)frameBuffer4+(SCR_XSIZE*LCD_YSIZE/4))>>1)) | (MVAL<<21);
	rLCDSADDR3= (LCD_XSIZE/8) | ( ((SCR_XSIZE-LCD_XSIZE)/8)<<9 );
	// The following value has to be changed for better display.
	// Select 4 levels among 16 gray levels.
	rBLUELUT=0xfa40; 
	rDITHMODE=0x0;
	rDP1_2 =0xa5a5;      
	rDP4_7 =0xba5da65;
	rDP3_5 =0xa5a5f;
	rDP2_3 =0xd6b;
	rDP5_7 =0xeb7b5ed;
	rDP3_4 =0x7dbe;
	rDP4_5 =0x7ebdf;
	rDP6_7 =0x7fdfbfe;
	rLCDCON1=(1)|(1<<5)|(MVAL_USED<<7)|(0x3<<8)|(0x3<<10)|(CLKVAL_G4<<12);
	// enable,4B_SNGL_SCAN,WDLY=8clk,WLH=8clk,
	break;
    default:
	break;
    }	
}

void Lcd_MoveViewPort(int vx,int vy,int depth)
{
    U32 addr;
    switch(depth)
    {
    case 1:
    	// LCDBASEU,LCDBASEL register has to be changed before 12 words before the end of VLINE.
    	// In mono mode, x=320 is 10 words, So, We can't change LCDBASEU,LCDBASEL 
    	// during LINECNT=1~0 at mono mode. 
		//The processor mode should be superviser mode.  
    	DisableInterrupt(); 
    #if (LCD_XSIZE<512)
    	while((rLCDCON1>>22)<=1); // if x<512
    #else	
    	while((rLCDCON1>>22)==0); // if x>512 ((12+4)*32) 
    #endif

        addr=(U32)frameBuffer1+(vx/8)+vy*(SCR_XSIZE/8);
		rLCDSADDR1= (0x0<<27) | ( (addr>>22)<<21 ) | M5D(addr>>1);
	    // monochrome, LCDBANK, LCDBASEU
		rLCDSADDR2= M5D( ((addr+(SCR_XSIZE*LCD_YSIZE/8))>>1) ) | (MVAL<<21);
		EnableInterrupt();
       	break;
    case 4:
		//The processor mode should be superviser mode.  
    	DisableInterrupt(); 
    #if (LCD_XSIZE<256)
    	while((rLCDCON1>>22)<=1); // if x<256
    #else	
    	while((rLCDCON1>>22)==0); // if x>256
    #endif
        addr=(U32)frameBuffer4+(vx/4)+vy*(SCR_XSIZE/4);
	rLCDSADDR1= (0x1<<27) | ( (addr>>22)<<21 ) | M5D(addr>>1);
	    // 4-gray, LCDBANK, LCDBASEU
	rLCDSADDR2= M5D(((addr+(SCR_XSIZE*LCD_YSIZE/4))>>1)) | (MVAL<<21);
	EnableInterrupt();
    	break;
    }
}    
    
void Lcd_Display(void)
{
    int i,j;
    for(j=0;j<240;j++)
        for(i=0;i<20;i++)
        {
			frameBuffer1[j][i]=0xffff0000;
			frameBuffer4[j][i]=0xffff0000;
        }
}