TQ2440 学习笔记—— 25、LCD 控制器
（韦东山——嵌入式Linux 应用开发完全手册）
LCD 控制器
写程序：
1、打开背光
2、时序设置
3、在FrameBuffer 里写数据（不同的像素，其格式不同）
/*
* FILE: lcddrv.c
* 提供操作LCD控制器、调色板等的底层函数
*/
#include
#include "s3c24xx.h"
#include "lcddrv.h"
#define GPB0_tout0 (2<<(0*2))
#define GPB0_out (1<<(0*2))
#define GPB1_out (1<<(1*2))
#define GPB0_MSK (3<<(0*2))
#define GPB1_MSK (3<<(1*2))
unsigned int fb_base_addr;
unsigned int bpp;
unsigned int xsize;
unsigned int ysize;
static const unsigned short DEMO256pal[]={
0x0b5e,0xce9a,0xffd9,0x9d99,0xb63a,0xae7c,0xdd71,0x6c57,0xfd4d,0x00ae,0x9c4d,0xb5f8,0xad96,0x0131,0x0176,0xefff,0xcedd,0x9556,0xe4bf,0x00b6,0x22b7,0x002b,0x89de,0x002c,0x57df,0xab5f,0x3031,0x14bf,0x797e,0x5391,0x93ab,0x7239,0x7453,0xafdf,0x71b9,0x8c92,0x014d,0x302e,0x5175,0x0029,0x0969,0x004e,0x2a6d,0x0021,0x3155,0x4b6e,0xd677,0xf6b6,0x9b5f,0x4bb5,0xffd5,0x0027,0xdfdf,0x74d8,0x1256,0x6bcd,0x9b08,0x2ab2,0xbd72,0x84b5,0xfe52,0xd4ad,0x00ad,0xfffc,0x422b,0x73b0,0x0024,0x5246,0x8e5e,0x28b3,0x0050,0x3b52,0x2a4a,0x3a74,0x8559,0x3356,0x1251,0x9abf,0x4034,0x40b1,
0x8cb9,0x00b3,0x5c55,0xdf3d,0x61b7,0x1f5f,0x00d9,0x4c59,0x0926,0xac3f,0x925f,0x85bc,0x29d2,0xc73f,0xef5c,0xcb9f,0x827b,0x5279,0x4af5,0x01b9,0x4290,0xf718,0x126d,0x21a6,0x515e,0xefbd,0xd75e,0x42ab,0x00aa,0x10b3,0x7349,0x63b5,0x61a3,0xaadf,0xcb27,0x87df,0x6359,0xc7df,0x4876,0xb5bc,0x4114,0xfe2e,0xef5e,0x65be,0x43b9,0xe5df,0x21c9,0x7d16,0x6abb,0x5c11,0x49f7,0xbc0b,0x9e1a,0x3b0f,0x202b,0xff12,0x821b,0x842f,0xbccf,0xdefb,0x8a3e,0x68fa,0xa4f1,0x38ae,0x28b7,0x21ad,0x31d7,0x0073,0x182b,0x1831,0x3415,0xbdf6,0x2dbf,0x0a5d,0xc73d,0x182c,0x293e,0x7b3d,0x643d,0x3cbd,
0x92dd,0x09d4,0x1029,0x7cdd,0x6239,0x182e,0x5aea,0x11eb,0x8abc,0x7bfa,0x00a7,0x2153,0x1853,0x1318,0x0109,0x54fa,0x72a7,0x89e3,0x01cf,0x3a07,0x7b17,0x1a14,0x2150,0x23dc,0x4142,0x1b33,0x00a4,0xf6df,0x08fc,0x18ae,0x3a7e,0x18d1,0xa51c,0xff5a,0x1a0f,0x28fa,0xdfbe,0x82de,0x60d7,0x1027,0x48fa,0x5150,0x6213,0x89d6,0x110d,0x9bbb,0xbedd,0x28e1,0x1925,0xf449,0xaa79,0xd5f4,0x693c,0x110a,0x2889,0x08a2,0x923d,0x10a6,0xd9bc,0x5b2e,0x32ec,0xcf7f,0x1025,0x2148,0x74b4,0x6d59,0x9d14,0x0132,0x00f0,0x56bf,0x00f1,0xffff,0x0173,0x0133,0x00b0,0x00b1,0xf7ff,0x08b1,0xfffe,0x08b0,
0x0171,0xf7bf,0x10f3,0xf7fe,0x08ef,0x1192,0xefbe,0x1131,0x2177,0xff9f,0x1116,0xffbc,0x5914,0x22ef,0xb285,0xa6df,
};
/*
* 初始化用于LCD的引脚
*/
void Lcd_Port_Init(void)
{
GPCUP = 0xffffffff; // 禁止内部上拉
GPCCON = 0xaaaaaaaa; // GPIO管脚用于VD[7:0],LCDVF[2:0],VM,VFRAME,VLINE,VCLK,LEND
GPDUP = 0xffffffff; // 禁止内部上拉
GPDCON = 0xaaaaaaaa; // GPIO管脚用于VD[23:8]
GPBCON &= ~(GPB0_MSK); // Power enable pin
GPBCON |= GPB0_out;
GPBDAT &= ~(1<<0); // Power off
printf("Initializing GPIO ports..........\n");
}
/*
* 初始化LCD控制器
* 输入参数：
* type: 显示模式
* MODE_TFT_8BIT_240320 : 240*320 8bpp的TFT LCD
* MODE_TFT_16BIT_240320 : 240*320 16bpp的TFT LCD
* MODE_TFT_8BIT_640480 : 640*480 8bpp的TFT LCD
* MODE_TFT_16BIT_640480 : 640*480 16bpp的TFT LCD
*/
void Tft_Lcd_Init(int type)
{
switch(type)
{
case MODE_TFT_8BIT_480272:
/*
* 设置LCD控制器的控制寄存器LCDCON1~5
* 1. LCDCON1:
* 设置VCLK的频率：VCLK(Hz) = HCLK/[(CLKVAL+1)x2]
* 选择LCD类型: TFT LCD
* 设置显示模式: 8BPP
* 先禁止LCD信号输出
* 2. LCDCON2/3/4:
* 设置控制信号的时间参数
* 设置分辨率，即行数及列数
* 现在，可以根据公式计算出显示器的频率：
* 当HCLK=100MHz时，
* Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x
* {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x
* {2x(CLKVAL+1)/(HCLK)}]
*
* 3. LCDCON5:
* 设置显示模式为8BPP时，调色板中的数据格式: 5:6:5
* 设置HSYNC、VSYNC脉冲的极性(这需要参考具体LCD的接口信号): 反转
* 字节交换使能
*/
LCDCON1 = (CLKVAL_TFT_480272<<8) | (LCDTYPE_TFT<<5) | \
(BPPMODE_8BPP<<1) | (ENVID_DISABLE<<0);
LCDCON2 = (VBPD_480272<<24) | (LINEVAL_TFT_480272<<14) | \
(VFPD_480272<<6) | (VSPW_480272);
LCDCON3 = (HBPD_480272<<19) | (HOZVAL_TFT_480272<<8) | (HFPD_480272);
LCDCON4 = HSPW_480272;
LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) | \
(BSWP<<1);
/*
* 设置LCD控制器的地址寄存器LCDSADDR1~3
* 帧内存与视口(view point)完全吻合，
* 图像数据格式如下(8BPP时，帧缓冲区中的数据为调色板中的索引值)：
* |----PAGEWIDTH----|
* y/x 0 1 2 479
* 0 idx idx idx ... idx
* 1 idx idx idx ... idx
* 1. LCDSADDR1:
* 设置LCDBANK、LCDBASEU
* 2. LCDSADDR2:
* 设置LCDBASEL: 帧缓冲区的结束地址A[21:1]
* 3. LCDSADDR3:
* OFFSIZE等于0，PAGEWIDTH等于(480/2)
*/
LCDSADDR1 = ((LCDFRAMEBUFFER>>22)<<21) | LOWER21BITS(LCDFRAMEBUFFER>>1);
LCDSADDR2 = LOWER21BITS((LCDFRAMEBUFFER+ \
(LINEVAL_TFT_480272+1)*(HOZVAL_TFT_480272+1)*1)>>1);
LCDSADDR3 = (0<<11) | (LCD_XSIZE_TFT_480272/2);
/* 禁止临时调色板寄存器 */
TPAL = 0;
fb_base_addr = LCDFRAMEBUFFER;
bpp = 8;
xsize = 480;
ysize = 272;
break;
case MODE_TFT_16BIT_480272:
/*
* 设置LCD控制器的控制寄存器LCDCON1~5
* 1. LCDCON1:
* 设置VCLK的频率：VCLK(Hz) = HCLK/[(CLKVAL+1)x2]
* 选择LCD类型: TFT LCD
* 设置显示模式: 16BPP
* 先禁止LCD信号输出
* 2. LCDCON2/3/4:
* 设置控制信号的时间参数
* 设置分辨率，即行数及列数
* 现在，可以根据公式计算出显示器的频率：
* 当HCLK=100MHz时，
* Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x
* {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x
* {2x(CLKVAL+1)/(HCLK)}]
* = 60Hz
* 3. LCDCON5:
* 设置显示模式为16BPP时的数据格式: 5:6:5
* 设置HSYNC、VSYNC脉冲的极性(这需要参考具体LCD的接口信号): 反转
* 半字(2字节)交换使能
*/
LCDCON1 = (CLKVAL_TFT_480272<<8) | (LCDTYPE_TFT<<5) | \
(BPPMODE_16BPP<<1) | (ENVID_DISABLE<<0);
LCDCON2 = (VBPD_480272<<24) | (LINEVAL_TFT_480272<<14) | \
(VFPD_480272<<6) | (VSPW_480272);
LCDCON3 = (HBPD_480272<<19) | (HOZVAL_TFT_480272<<8) | (HFPD_480272);
LCDCON4 = HSPW_480272;
LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) | \
(HWSWP<<1);
/*
* 设置LCD控制器的地址寄存器LCDSADDR1~3
* 帧内存与视口(view point)完全吻合，
* 图像数据格式如下：
* |----PAGEWIDTH----|
* y/x 0 1 2 479
* 0 rgb rgb rgb ... rgb
* 1 rgb rgb rgb ... rgb
* 1. LCDSADDR1:
* 设置LCDBANK、LCDBASEU
* 2. LCDSADDR2:
* 设置LCDBASEL: 帧缓冲区的结束地址A[21:1]
* 3. LCDSADDR3:
* OFFSIZE等于0，PAGEWIDTH等于(480*2/2)
*/
LCDSADDR1 = ((LCDFRAMEBUFFER>>22)<<21) | LOWER21BITS(LCDFRAMEBUFFER>>1);
LCDSADDR2 = LOWER21BITS((LCDFRAMEBUFFER+ \
(LINEVAL_TFT_480272+1)*(HOZVAL_TFT_480272+1)*2)>>1);
LCDSADDR3 = (0<<11) | (LCD_XSIZE_TFT_480272*2/2);
/* 禁止临时调色板寄存器 */
TPAL = 0;
fb_base_addr = LCDFRAMEBUFFER;
bpp = 16;
xsize = 480;
ysize = 272;
break;
case MODE_TFT_8BIT_640480:
/*
* 设置LCD控制器的控制寄存器LCDCON1~5
* 1. LCDCON1:
* 设置VCLK的频率：VCLK(Hz) = HCLK/[(CLKVAL+1)x2]
* 选择LCD类型: TFT LCD
* 设置显示模式: 8BPP
* 先禁止LCD信号输出
* 2. LCDCON2/3/4:
* 设置控制信号的时间参数
* 设置分辨率，即行数及列数
* 现在，可以根据公式计算出显示器的频率：
* 当HCLK=100MHz时，
* Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x
* {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x
* {2x(CLKVAL+1)/(HCLK)}]
* = 60Hz
* 3. LCDCON5:
* 设置显示模式为8BPP时，调色板中的数据格式: 5:6:5
* 设置HSYNC、VSYNC脉冲的极性(这需要参考具体LCD的接口信号): 反转
* 字节交换使能
*/
LCDCON1 = (CLKVAL_TFT_640480<<8) | (LCDTYPE_TFT<<5) | \
(BPPMODE_8BPP<<1) | (ENVID_DISABLE<<0);
LCDCON2 = (VBPD_640480<<24) | (LINEVAL_TFT_640480<<14) | \
(VFPD_640480<<6) | (VSPW_640480);
LCDCON3 = (HBPD_640480<<19) | (HOZVAL_TFT_640480<<8) | (HFPD_640480);
LCDCON4 = HSPW_640480;
LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) | \
(BSWP<<1);
/*
* 设置LCD控制器的地址寄存器LCDSADDR1~3
* 帧内存与视口(view point)完全吻合，
* 图像数据格式如下(8BPP时，帧缓冲区中的数据为调色板中的索引值)：
* |----PAGEWIDTH----|
* y/x 0 1 2 639
* 0 idx idx idx ... idx
* 1 idx idx idx ... idx
* 1. LCDSADDR1:
* 设置LCDBANK、LCDBASEU
* 2. LCDSADDR2:
* 设置LCDBASEL: 帧缓冲区的结束地址A[21:1]
* 3. LCDSADDR3:
* OFFSIZE等于0，PAGEWIDTH等于(640/2)
*/
LCDSADDR1 = ((LCDFRAMEBUFFER>>22)<<21) | LOWER21BITS(LCDFRAMEBUFFER>>1);
LCDSADDR2 = LOWER21BITS((LCDFRAMEBUFFER+ \
(LINEVAL_TFT_640480+1)*(HOZVAL_TFT_640480+1)*1)>>1);
LCDSADDR3 = (0<<11) | (LCD_XSIZE_TFT_640480/2);
/* 禁止临时调色板寄存器 */
TPAL = 0;
fb_base_addr = LCDFRAMEBUFFER;
bpp = 8;
xsize = 640;
ysize = 480;
break;
case MODE_TFT_16BIT_640480:
/*
* 设置LCD控制器的控制寄存器LCDCON1~5
* 1. LCDCON1:
* 设置VCLK的频率：VCLK(Hz) = HCLK/[(CLKVAL+1)x2]
* 选择LCD类型: TFT LCD
* 设置显示模式: 16BPP
* 先禁止LCD信号输出
* 2. LCDCON2/3/4:
* 设置控制信号的时间参数
* 设置分辨率，即行数及列数
* 现在，可以根据公式计算出显示器的频率：
* 当HCLK=100MHz时，
* Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x
* {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x
* {2x(CLKVAL+1)/(HCLK)}]
* = 60Hz
* 3. LCDCON5:
* 设置显示模式为16BPP时的数据格式: 5:6:5
* 设置HSYNC、VSYNC脉冲的极性(这需要参考具体LCD的接口信号): 反转
* 半字(2字节)交换使能
*/
LCDCON1 = (CLKVAL_TFT_640480<<8) | (LCDTYPE_TFT<<5) | \
(BPPMODE_16BPP<<1) | (ENVID_DISABLE<<0);
LCDCON2 = (VBPD_640480<<24) | (LINEVAL_TFT_640480<<14) | \
(VFPD_640480<<6) | (VSPW_640480);
LCDCON3 = (HBPD_640480<<19) | (HOZVAL_TFT_640480<<8) | (HFPD_640480);
LCDCON4 = HSPW_640480;
LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) | \
(HWSWP<<1);
/*
* 设置LCD控制器的地址寄存器LCDSADDR1~3
* 帧内存与视口(view point)完全吻合，
* 图像数据格式如下：
* |----PAGEWIDTH----|
* y/x 0 1 2 639
* 0 rgb rgb rgb ... rgb
* 1 rgb rgb rgb ... rgb
* 1. LCDSADDR1:
* 设置LCDBANK、LCDBASEU
* 2. LCDSADDR2:
* 设置LCDBASEL: 帧缓冲区的结束地址A[21:1]
* 3. LCDSADDR3:
* OFFSIZE等于0，PAGEWIDTH等于(640*2/2)
*/
LCDSADDR1 = ((LCDFRAMEBUFFER>>22)<<21) | LOWER21BITS(LCDFRAMEBUFFER>>1);
LCDSADDR2 = LOWER21BITS((LCDFRAMEBUFFER+ \
(LINEVAL_TFT_640480+1)*(HOZVAL_TFT_640480+1)*2)>>1);
LCDSADDR3 = (0<<11) | (LCD_XSIZE_TFT_640480*2/2);
/* 禁止临时调色板寄存器 */
TPAL = 0;
fb_base_addr = LCDFRAMEBUFFER;
bpp = 16;
xsize = 640;
ysize = 480;
break;
default:
break;
}
}
/*
* 设置调色板
*/
void Lcd_Palette8Bit_Init(void)
{
int i;
volatile unsigned int *palette;
LCDCON1 &= ~0x01; // stop lcd controller
LCDCON5 |= (FORMAT8BPP_565<<11); // 设置调色板中数据格式为5:6:5
palette = (volatile unsigned int *)PALETTE;
for (i = 0; i < 256; i++)
*palette++ = DEMO256pal[i];
LCDCON1 |= 0x01; // re-enable lcd controller
}
/*
* 改变调色板为一种颜色
* 输入参数：
* color: 颜色值，格式为0xRRGGBB
*/
void ChangePalette(UINT32 color)
{
int i;
unsigned char red, green, blue;
UINT32 *palette;
red = (color >> 19) & 0x1f;
green = (color >> 10) & 0x3f;
blue = (color >> 3) & 0x1f;
color = (red << 11) | (green << 5) | blue; // 格式5:6:5
palette=(UINT32 *)PALETTE;
LCDCON1 &= ~0x01; // stop lcd controller
for (i = 0; i < 256; i++)
{
// while (((LCDCON5>>15) & 0x3) == 2); // 等待直到VSTATUS不为”有效”
*palette++ = color;
}
LCDCON1 |= 0x01; // re-enable lcd controller
}
/*
* 设置是否输出LCD电源开关信号LCD_PWREN
* 输入参数：
* invpwren: 0 - LCD_PWREN有效时为正常极性
* 1 - LCD_PWREN有效时为反转极性
* pwren: 0 - LCD_PWREN输出有效
* 1 - LCD_PWREN输出无效
*/
void Lcd_PowerEnable(int invpwren, int pwren)
{
GPGCON = (GPGCON & (~(3<<8))) | (3<<8); // GPG4用作LCD_PWREN
GPGUP = (GPGUP & (~(1<<4))) | (1<<4); // 禁止内部上拉
LCDCON5 = (LCDCON5 & (~(1<<5))) | (invpwren<<5); // 设置LCD_PWREN的极性: 正常/反转
LCDCON5 = (LCDCON5 & (~(1<<3))) | (pwren<<3); // 设置是否输出LCD_PWREN
}
/*
* 设置LCD控制器是否输出信号
* 输入参数：
* onoff:
* 0 : 关闭
* 1 : 打开
*/
void Lcd_EnvidOnOff(int onoff)
{
if (onoff == 1)
{
LCDCON1 |= 1; // ENVID ON
}
else
{
LCDCON1 &= 0x3fffe; // ENVID Off
}
}
/*
* 使用临时调色板寄存器输出单色图像
* 输入参数：
* color: 颜色值，格式为0xRRGGBB
*/
void ClearScrWithTmpPlt(UINT32 color)
{
TPAL = (1<<24)|((color & 0xffffff)<<0);
}
/*
* 停止使用临时调色板寄存器
*/
void DisableTmpPlt(void)
{
TPAL = 0;
}