五、LCD屏填充纯色

　　废话不说，直接上代码：

　　lcd.c

 #include "lcd.h"

 static int PEN_COLOR = LCD_RED;     /* 定义画笔（前景）颜色 */
 static int BK_COLOR  = LCD_BLACK;   /* 定义背景颜色 */

 /**
  * \brief LCD初始化
  */
 void lcd_init (void)
 {
     GPICON = ;
     GPICON |= 0xaaaaaaaa;
     GPJCON = ;
     GPJCON |= 0xaaaaaa;

     MIFPCON &= ~(0x1<<);
     SPCON &= ~0x3;
     SPCON |= 0x1;

     VIDCON0 = (<<) | (0x1<<) | (0x3);
     VIDCON1 = (0x1<<) | (0x1<<);

     VIDTCON0 = (<<) | (<<) | ();
     VIDTCON1 = (<<) | (<<) | ();

     VIDTCON2 = ((LCD_HEIGHT - ) << ) | (LCD_WIDTH - );
     WINCON0 = (0xb<<) | (0x1);

     VIDOSD0A = ;
     VIDOSD0B = ((LCD_WIDTH - ) << ) | ((LCD_HEIGHT - ));

     VIDOSD0C = LCD_WIDTH * LCD_HEIGHT;

     VIDW00ADD0B0 = SHOW_BUF;
 }

 /**
  * \brief 设置画笔颜色
  */
 void set_pen_color (int color)
 {
     PEN_COLOR = color;
 }

 /**
  * \brief 设置背景颜色
  */
 void set_bk_color (int color)
 {
     BK_COLOR = color;
 }

 /**
  * \brief 绘制一个点
  */
 void lcd_draw_point (int x, int y)
 {
     *((int *)SHOW_BUF + x + y * LCD_WIDTH) = PEN_COLOR;
 }

 void lcd_draw_bk (int x, int y)
 {
     *((int *)SHOW_BUF + x + y * LCD_WIDTH) = BK_COLOR;
 }

 /**
  * \brief 清屏（填充背景色）
  */
 void lcd_clean (void)
 {
     int i, j, k;
     for(i=; i<LCD_HEIGHT; i++) {
         for(j=; j<LCD_WIDTH; j++) {
             lcd_draw_bk(j, i);
         }
     }
 }

　　lcd.h

 #ifndef __LCD_H
 #define __LCD_H

 /* 定义寄存器地址 */
 #define GPICON  (*(unsigned int *)0x7F008100)
 #define SPCON   (*(unsigned int *)0x7F0081A0)
 #define MIFPCON (*(unsigned int *)0x7410800c)
 #define GPJCON  (*(unsigned int *)0x7F008120)

 #define VIDCON0       (*(unsigned int *)0x77100000)
 #define VIDCON1       (*(unsigned int *)0x77100004)
 #define VIDCON2       (*(unsigned int *)0x77100008)
 #define VIDTCON0      (*(unsigned int *)0x77100010)
 #define VIDTCON1      (*(unsigned int *)0x77100014)
 #define VIDTCON2      (*(unsigned int *)0x77100018)
 #define WINCON0       (*(unsigned int *)0x77100020)
 #define WINCON1       (*(unsigned int *)0x77100024)
 #define WINCON2       (*(unsigned int *)0x77100028)
 #define WINCON3       (*(unsigned int *)0x7710002C)
 #define WINCON4       (*(unsigned int *)0x77100030)
 #define VIDOSD0A      (*(unsigned int *)0x77100040)
 #define VIDOSD0B      (*(unsigned int *)0x77100044)
 #define VIDOSD0C      (*(unsigned int *)0x77100048)
 #define VIDOSD1A      (*(unsigned int *)0x77100050)
 #define VIDOSD1B      (*(unsigned int *)0x77100054)
 #define VIDOSD1C      (*(unsigned int *)0x77100058)
 #define VIDW00ADD0B0  (*(unsigned int *)0x771000A0)
 #define GPECON        (*(unsigned int *)0x7f008080)
 #define GPEDAT        (*(unsigned int *)0x7f008084)

 #define LCD_WIDTH   480     /* 定义LCD宽度 */
 #define LCD_HEIGHT  272     /* 定义LCD高度 */

 /* 定义显存地址 */
 #define SHOW_BUF 0x54000000

 /* 定义常用颜色 */
 #define COL(R,G,B)   ((R<<16) | (G<<8) | (B))
 #define LCD_RED          COL(0xFF, 0, 0)
 #define LCD_GREEN     COL(0, 0xFF, 0)
 #define LCD_BLUE      COL(0, 0, 0xFF)
 #define LCD_WHITE     COL(0xFF, 0xFF, 0xFF)
 #define LCD_BLACK     COL(0, 0, 0)

 /******************************* 函数声明 **************************/
 /**
  * \brief LCD初始化
  */
 extern void lcd_init (void);

 /**
  * \brief 设置画笔颜色
  */
 extern void set_pen_color (int color);

 /**
  * \brief 设置背景颜色
  */
 extern void set_bk_color (int color);

 /**
  * \brief 绘制一个点
  */
 extern void lcd_draw_point (int x, int y);

 /**
  * \brief 清屏（填充背景色）
  */
 extern void lcd_clean (void);

 #endif

　　main.c

 #include "lcd.h"

 int main(int argc, const char *argv[])
 {
     lcd_init();
     set_bk_color(LCD_RED);
     lcd_clean();
     return ;
 }

　　start.s

 .section .text
 .global _start

 _start:
     b main
     .end

　Makefile

 CC = arm-none-linux-gnueabi-
 objs = main.o lcd.o start.o

 test.bin:$(objs)
     $(CC)ld $(objs) -Ttext  -o test.elf
     $(CC)objcopy -O binary test.elf test.bin

 %.o:%.c
     $(CC)gcc -c $< -o $@

 %.o:%.s
     $(CC)gcc -c $< -o $@

 clean:
     rm *.o *.elf *.bin