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最近研究了s3c2410下LCD控制器的相关知识，主要的参考资料就是 三星s3c2410数据手册(arm920T)，英文版，看的不是非常明白，后来参考了WinCE下的部分代码，似有所领悟。于是写了此程序，用以在LCD上显示图片。
本程序可以在LCD上居中显示小于800×480的任意大小的图片。用到的辅助工具就是上篇文章中的RGB分量提取器.
关键模块如下： 0、全局变量的定义： #define DMA_BUFFER_BASE 0xAC000000
#define DMA_PHYSICAL_BASE 0x35000000 // S3C2410X01 0x30000000 #define FRAMEBUF_BASE (DMA_BUFFER_BASE + 0x00100000)
#define FRAMEBUF_DMA_BASE (DMA_PHYSICAL_BASE + 0x00000000)//0x00100000 #define IOP_BASE 0x56000000 // 0x56000000 typedef struct {
unsigned int GPACON; // 00
unsigned int GPADAT;
unsigned int PAD1[2];
...................
}IOPreg;
// Define LCD type of S3C2400X01
#define TFT24BPP 3
#define LCDTYPE TFT24BPP // define LCD type as upper definition.
//
// Registers : LCD Controller
// #define LCD_BASE 0x4D000000 // 0x4D000000
typedef struct {
unsigned int LCDCON1; // 00
unsigned int LCDCON2; // 04
unsigned int LCDCON3; // 08
.....................
}LCDreg ; // LCD register value #define MODE_TFT_24BIT (224)
#define LCD_XSIZE_TFT (800)
#define LCD_YSIZE_TFT (480)
#define ARRAY_SIZE_TFT_24BIT (SCR_XSIZE*4*SCR_YSIZE)
#define HOZVAL_TFT (LCD_XSIZE_TFT-1)
#define LINEVAL_TFT (LCD_YSIZE_TFT-1)
#define MVAL (13)
#define MVAL_USED (0)
#define VBPD ((32-1)&0xff)
#define VFPD ((11-1)&0xff)
#define VSPW ((2-1) &0x3f)
#define HBPD ((88-1)&0x7f)
#define HFPD ((40-1)&0xff)
#define HSPW ((128-1)&0xff)
#define CLKVAL_TFT (1)
#define M5D(n) ((n) & 0x1fffff) U32* pLCDBuffer24=(U32*)FRAMEBUF_DMA_BASE;
U32* picData; volatile LCDreg *s2410LCD = (LCDreg *)LCD_BASE; volatile IOPreg *s2410IOP= (IOPreg *)IOP_BASE; int nCol = 800;//象素列数
int nRow = 480;//象素行数
U32* picDataT=NULL; 1、入口函数，其中包括了相应端口、寄存器初始化的入口，aa,bb,cc,dd,ee是可选择的5幅预定义图片的GRB码数组，具体代码如下 void lcd_Main(void)
{
char sel;
Uart_Printf("Lcd_Driver ");
lcd_port_init();
lcd_regs_init();
Uart_Printf("select one Picture to show(1 2 3 4 5 0) ");
while((sel = Uart_Getch()) != 'e')
{
Uart_Printf("%c ",sel);
switch(sel)
{
case '1':
picData = (U32*)aa;break;
case '2':
picData =(U32*)bb;break;
case '3':
picData = (U32*)cc;break;
case '4':
picData = (U32*)dd; break;
case '5':
picData = (U32*)ee;break;
default:
Uart_Printf("Input 1 2 3 4 5 0 ");
}
lcd_display();
Uart_Printf("select one Picture to show(1 2 3 4 5 0) ");
}
Uart_Printf("Exit");
//lcd_close();
} 2、相应端口设置，包括GPC，GPD，GPG的相应位的设置：
void lcd_port_init(void)
{ // LCD port initialize.
s2410IOP->GPCUP = 0xFFFFFFFF;
s2410IOP->GPCCON = 0xAAAAAAAA; s2410IOP->GPDUP = 0xFFFFFFFF;
s2410IOP->GPDCON = 0xAAAAAAAA; s2410IOP->GPGCON &= ~(3 << 8); /**//* Set LCD_PWREN as output */
s2410IOP->GPGCON |= (1 << 8); s2410IOP->GPGDAT |= (1 << 4); //* Backlight ON，关键，不然lcd不亮
} 3、控制寄存器设置： void lcd_regs_init(void)
{
#ifdef MODE_TFT_24BIT s2410LCD->LCDCON1 = (1 << 8) | //* VCLK = HCLK / ((CLKVAL + 1) * 2) -> About 7 Mhz
(MVAL_USED << 7) | //* 0 : Each Frame
(3 << 5) | // TFT LCD Pannel
(13 << 1) | //Y: // 24bpp Mode
(0 << 0) ; // Disable LCD Output s2410LCD->LCDCON2 = (VBPD << 24) | //* VBPD : ((32-1)&0xff)
(LINEVAL_TFT << 14) | //* LINEVAL_TFT : 480 - 1
(VFPD << 6) | //* VFPD : ((11-1)&0xff)
(VSPW << 0) ; //* VSPW : ((2-1) &0x3f) s2410LCD->LCDCON3 = (HBPD << 19) | //* HBPD : ((88-1)&0x7f)
(HOZVAL_TFT << 8) | //* HOZVAL_TFT : 800 - 1
(HFPD << 0) ; //* HFPD : ((40-1)&0xff)
s2410LCD->LCDCON4 = (MVAL << 8) | //* MVAL : 13
(HSPW << 0) ; //* HSPW : ((128-1)&0xff)
s2410LCD->LCDCON5 = 0x00000000;
/**//*
s2410LCD->LCDCON5 = (0 << 12) | // BPP24BL : LSB valid
(0 << 11) | // FRM565 MODE : 5:5:5:1 Format
(0 << 10) | // INVVCLK : VCLK Falling Edge
(0 << 9) | // INVVLINE : Inverted Polarity
(0 << 8) | // INVVFRAME : Inverted Polarity
(0 << 7) | // INVVD : Normal
(0 << 6) | // INVVDEN : Normal
(0 << 5) | // INVPWREN : Normal
(0 << 4) | // INVENDLINE : Normal
(0 << 3) | // PWREN : Disable PWREN
(0 << 2) | // ENLEND : Disable LEND signal
(0 << 1) | // BSWP : Swap Disable
(0 << 0) ; // HWSWP : Swap Enable
*/
s2410LCD->LCDSADDR1 = ((FRAMEBUF_DMA_BASE >> 22) << 21) |
((M5D(FRAMEBUF_DMA_BASE >> 1)) << 0);
//LCDBANK = ((FRAMEBUF_DMA_BASE >> 22) << 21)
//LCDBASEU = ((M5D(FRAMEBUF_DMA_BASE) >> 1) << 0)
s2410LCD->LCDSADDR2 = (M5D(FRAMEBUF_DMA_BASE) >> 1) + ( (LCD_XSIZE_TFT*2) + 0 )*(LINEVAL_TFT+1);
//LCDBASEL = s2410LCD->LCDSADDR2
s2410LCD->LCDSADDR3 = (((LCD_XSIZE_TFT - LCD_XSIZE_TFT) / 1) << 11) | (LCD_XSIZE_TFT);
//OFFSIZE = (((LCD_XSIZE_TFT - LCD_XSIZE_TFT) / 1) << 11) == 0
//PAGEWIDTH = (LCD_XSIZE_TFT)
s2410LCD->TPAL = 0x0;
s2410LCD->LCDCON1 |= 1;
#endif
}
4、居中显示图片：
void lcd_display(void)
{
int y;
int pw, ph;
int sw=800, sh=480;
U32* pdata;
U32* pBt=NULL;
lcd_clear();
get_XY();//获得图片的宽与高，以保存在RGB数组的头两个字节。
pw = nCol, ph = nRow;
pBt = pLCDBuffer24 + sw*(sh/2-ph/2) + (sw/2-pw/2);//定位图片显示的起始位置
pdata = (U32*)picDataT;
for(y=0; y<nRow; ++y)
...{
memcpy((pBt+800*y),(char*)pdata,nCol*4);//一行一行显示
pdata = (U32*)(pdata+nCol);
}
s2410LCD->LCDCON1 |= 0;
} 5、每次显示都要获得图片的宽度和高度，并且清除前面的屏幕，所谓清屏就是显示背景图片（蓝色）：
void lcd_clear()
{
int y=0;
U32* pdata = (U32*)(bgData+2);
for(y=0; y<480; ++y)
{
memcpy((pLCDBuffer24+800*y),(char*)pdata,800*4);
pdata = (U32*)(pdata+800);
}
} void get_XY(void)
{
nCol = picData[0];
nRow = picData[1];
picDataT =(U32*) (picData + 2);
}
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