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();
}