LCD编程_简单测试

首先，需要编写一个led_test.c的文件，依据代码框架，在led_test.c中我们能够看到的只是led.c。我们是看不到led_controller.c的。比如说，在led_test.c中，需要使用led_controller.c中的函数，需要在led.c中对led_controller.c中的函数进行封装。

怎样去使用lcd呢，框图如下：

秉承上述的思想，于是就有了下面的代码。

led_test.c

 void lcd_test(void)
 {
     unsigned int fb_base;
     int xres, yres, bpp;
     int x, y;
     unsigned short *p;
     unsigned int *p2;

     /* 初始化LCD */
     lcd_init();

     /* 使能LCD */
     lcd_enable();

     /* 获得LCD的参数: fb_base, xres, yres, bpp */
     get_lcd_params(&fb_base, &xres, &yres, &bpp);

     /* 往framebuffer中写数据 */
     if (bpp == )
     {
         /* 让LCD输出整屏的红色 */

         /* 565: 0xf800 */

         p = (unsigned short *)fb_base;
         for (x = ; x < xres; x++)
             for (y = ; y < yres; y++)
                 *p++ = 0xf800;

         /* green */
         p = (unsigned short *)fb_base;
         for (x = ; x < xres; x++)
             for (y = ; y < yres; y++)
                 *p++ = 0x7e0;

         /* blue */
         p = (unsigned short *)fb_base;
         for (x = ; x < xres; x++)
             for (y = ; y < yres; y++)
                 *p++ = 0x1f;

     } }

led.c

 #include "lcd.h"
 #include "lcd_controller.h"

 #define LCD_NUM 10

 static p_lcd_params p_array_lcd[LCD_NUM];
 static p_lcd_params g_p_lcd_selected;

 int register_lcd(p_lcd_params plcd)
 {
     int i;
     for (i = ; i < LCD_NUM; i++)
     {
         if (!p_array_lcd[i])
         {
             p_array_lcd[i] = plcd;
             return i;
         }
     }
     return -;
 }

 int select_lcd(char *name)
 {
     int i;
     for (i = ; i < LCD_NUM; i++)
     {
         if (p_array_lcd[i] && !strcmp(p_array_lcd[i]->name, name))
         {
             g_p_lcd_selected = p_array_lcd[i];
             return i;
         }
     }
     return -;
 }

 void get_lcd_params(unsigned int *fb_base, int *xres, int *yres, int *bpp)
 {
     *fb_base = g_p_lcd_selected->fb_base;
     *xres = g_p_lcd_selected->xres;
     *yres = g_p_lcd_selected->yres;
     *bpp = g_p_lcd_selected->bpp;
 }

 void lcd_enable(void)
46 {
47     lcd_controller_enable();
48 }
49
 void lcd_disable(void)
51 {
52     lcd_controller_disable();
53 }

 int lcd_init(void)
 {
     /* 注册LCD */
     lcd_4_3_add();

     /* 注册LCD控制器 */
     lcd_contoller_add();

     /* 选择某款LCD */
     select_lcd("lcd_4.3");

     /* 选择某款LCD控制器 */
     select_lcd_controller("s3c2440");

     /* 使用LCD的参数, 初始化LCD控制器 */
     lcd_controller_init(g_p_lcd_selected);
 }

lcd_controller.c

 #include "lcd_controller.h"

 #define LCD_CONTROLLER_NUM 10

 static p_lcd_controller p_array_lcd_controller[LCD_CONTROLLER_NUM];
 static p_lcd_controller g_p_lcd_controller_selected;

 int register_lcd_controller(p_lcd_controller plcdcon)
 {
     int i;
     for (i = ; i < LCD_CONTROLLER_NUM; i++)
     {
         if (!p_array_lcd_controller[i])
         {
             p_array_lcd_controller[i] = plcdcon;
             return i;
         }
     }
     return -;
 }

 int select_lcd_controller(char *name)
 {
     int i;
     for (i = ; i < LCD_CONTROLLER_NUM; i++)
     {
         if (p_array_lcd_controller[i] && !strcmp(p_array_lcd_controller[i]->name, name))
         {
             g_p_lcd_controller_selected = p_array_lcd_controller[i];
             return i;
         }
     }
     return -;
 }

 /* 向上: 接收不同LCD的参数
  * 向下: 使用这些参数设置对应的LCD控制器
  */

 int lcd_controller_init(p_lcd_params plcdparams)
 {
     /* 调用所选择的LCD控制器的初始化函数 */
     if (g_p_lcd_controller_selected)
     {
         g_p_lcd_controller_selected->init(plcdparams);
         return ;
     }
     return -;
 }

52 void lcd_controller_enable(void)
53 {
54     if (g_p_lcd_controller_selected)
55     {
56         g_p_lcd_controller_selected->enable();
57     }
58 }

 void lcd_controller_disable(void)
61 {
62     if (g_p_lcd_controller_selected)
63     {
64         g_p_lcd_controller_selected->disable();
65     }
66 }

 void lcd_contoller_add(void)
 {
     s3c2440_lcd_contoller_add();
 }