LCD编程_简单测试

系统管理员 2021-10-25 13:16 172阅读 0赞

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：

![1105721-20190818080916043-361904457.png][]

秉承上述的思想，于是就有了下面的代码。

led\_test.c

1 void lcd_test(void) 2 { 3     unsigned int fb_base; 4     int xres, yres, bpp; 5     int x, y; 6     unsigned short *p; 7     unsigned int *p2; 8         
     9     /* 初始化LCD */
    10 lcd_init(); 11 
    12     /* 使能LCD */
    13 lcd_enable(); 14 
    15     /* 获得LCD的参数: fb_base, xres, yres, bpp */
    16     get_lcd_params(&fb_base, &xres, &yres, &bpp); 17     
    18     /* 往framebuffer中写数据 */
    19     if (bpp == 16) 20 { 21         /* 让LCD输出整屏的红色 */
    22 
    23         /* 565: 0xf800 */
    24 
    25         p = (unsigned short *)fb_base; 26         for (x = 0; x < xres; x++) 27             for (y = 0; y < yres; y++) 28                 *p++ = 0xf800; 29 
    30         /* green */
    31         p = (unsigned short *)fb_base; 32         for (x = 0; x < xres; x++) 33             for (y = 0; y < yres; y++) 34                 *p++ = 0x7e0; 35 
    36         /* blue */
    37         p = (unsigned short *)fb_base; 38         for (x = 0; x < xres; x++) 39             for (y = 0; y < yres; y++) 40                 *p++ = 0x1f; 41             
    42 }66 }

led.c

1 #include "lcd.h"
     2 #include "lcd_controller.h"
     3 
     4 #define LCD_NUM 10
     5 
     6 static p_lcd_params p_array_lcd[LCD_NUM]; 7 static p_lcd_params g_p_lcd_selected; 8 
     9 int register_lcd(p_lcd_params plcd) 10 { 11     int i; 12     for (i = 0; i < LCD_NUM; i++) 13 { 14         if (!p_array_lcd[i]) 15 { 16             p_array_lcd[i] = plcd; 17             return i; 18 } 19 } 20     return -1; 21 } 22 
    23 int select_lcd(char *name) 24 { 25     int i; 26     for (i = 0; i < LCD_NUM; i++) 27 { 28         if (p_array_lcd[i] && !strcmp(p_array_lcd[i]->name, name)) 29 { 30             g_p_lcd_selected = p_array_lcd[i]; 31             return i; 32 } 33 } 34     return -1; 35 } 36 
    37 void get_lcd_params(unsigned int *fb_base, int *xres, int *yres, int *bpp) 38 { 39     *fb_base = g_p_lcd_selected->fb_base; 40     *xres = g_p_lcd_selected->xres; 41     *yres = g_p_lcd_selected->yres; 42     *bpp = g_p_lcd_selected->bpp; 43 } 44 
    45 void lcd_enable(void) 46 { 47 lcd_controller_enable(); 48 } 49 
    50 void lcd_disable(void) 51 { 52 lcd_controller_disable(); 53 } 54 
    55 int lcd_init(void) 56 { 57     /* 注册LCD */
    58 lcd_4_3_add(); 59 
    60     /* 注册LCD控制器 */
    61 lcd_contoller_add(); 62     
    63     /* 选择某款LCD */
    64     select_lcd("lcd_4.3"); 65 
    66     /* 选择某款LCD控制器 */
    67     select_lcd_controller("s3c2440"); 68 
    69     /* 使用LCD的参数, 初始化LCD控制器 */
    70 lcd_controller_init(g_p_lcd_selected); 71 }

lcd\_controller.c

1 #include "lcd_controller.h"
     2 
     3 #define LCD_CONTROLLER_NUM 10
     4 
     5 static p_lcd_controller p_array_lcd_controller[LCD_CONTROLLER_NUM]; 6 static p_lcd_controller g_p_lcd_controller_selected; 7 
     8 int register_lcd_controller(p_lcd_controller plcdcon) 9 { 10     int i; 11     for (i = 0; i < LCD_CONTROLLER_NUM; i++) 12 { 13         if (!p_array_lcd_controller[i]) 14 { 15             p_array_lcd_controller[i] = plcdcon; 16             return i; 17 } 18 } 19     return -1; 20 } 21 
    22 int select_lcd_controller(char *name) 23 { 24     int i; 25     for (i = 0; i < LCD_CONTROLLER_NUM; i++) 26 { 27         if (p_array_lcd_controller[i] && !strcmp(p_array_lcd_controller[i]->name, name)) 28 { 29             g_p_lcd_controller_selected = p_array_lcd_controller[i]; 30             return i; 31 } 32 } 33     return -1; 34 } 35 
    36 
    37 /* 向上: 接收不同LCD的参数 38 * 向下: 使用这些参数设置对应的LCD控制器 39  */
    40 
    41 int lcd_controller_init(p_lcd_params plcdparams) 42 { 43     /* 调用所选择的LCD控制器的初始化函数 */
    44     if (g_p_lcd_controller_selected) 45 { 46         g_p_lcd_controller_selected->init(plcdparams); 47         return 0; 48 } 49     return -1; 50 } 51 
    52 void lcd_controller_enable(void) 53 { 54 if (g_p_lcd_controller_selected) 55 { 56 g_p_lcd_controller_selected->enable(); 57 } 58 } 59 
    60 void lcd_controller_disable(void) 61 { 62 if (g_p_lcd_controller_selected) 63 { 64 g_p_lcd_controller_selected->disable(); 65 } 66 } 67 
    68 
    69 void lcd_contoller_add(void) 70 { 71 s3c2440_lcd_contoller_add(); 72 }

转载于:https://www.cnblogs.com/-glb/p/11371373.html

[1105721-20190818080916043-361904457.png]: /images/20211025/a30dba70c25a49bfa996ba2e933b2c70.png