看下面的代码，你会发现韦老师这种组织与内核框架的组织是一脉相承的。
led.c
#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 -;
} 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);
}
led_4.3.c
#define LCD_FB_BASE 0x33c00000
lcd_params lcd_4_3_params = {
.name = "lcd_4.3"
.pins_polarity = {
.de = NORMAL, /* normal: 高电平时可以传输数据 */
.pwren = NORMAL, /* normal: 高电平有效 */
.vclk = NORMAL, /* normal: 在下降沿获取数据 */
.rgb = NORMAL, /* normal: 高电平表示1 */
.hsync = INVERT, /* normal: 高脉冲 */
.vsync = INVERT, /* normal: 高脉冲 */
},
.time_sequence = {
/* 垂直方向 */
.tvp= , /* vysnc脉冲宽度 */
.tvb= , /* 上边黑框, Vertical Back porch */
.tvf= , /* 下边黑框, Vertical Front porch */
/* 水平方向 */
.thp= , /* hsync脉冲宽度 */
.thb= , /* 左边黑框, Horizontal Back porch */
.thf= , /* 右边黑框, Horizontal Front porch */
.vclk= , /* MHz */
},
.xres = ,
.yres = ,
.bpp = ,
.fb_base = LCD_FB_BASE,
};
void lcd_4_3_add(void)
{
register_lcd(&lcd_4_3_params);
}led_controller.c
#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 -;
} void lcd_contoller_add(void)
{
s3c2440_lcd_contoller_add();
}
s3c2440_lcd_controller.c
#define HCLK 100 void jz2440_lcd_pin_init(void)
{
/* 初始化引脚 : 背光引脚 */
GPBCON &= ~0x3;
GPBCON |= 0x01; /* LCD专用引脚 */
GPCCON = 0xaaaaaaaa;
GPDCON = 0xaaaaaaaa; /* PWREN */
GPGCON |= (<<);
} /* 根据传入的LCD参数设置LCD控制器 */
void s3c2440_lcd_controller_init(p_lcd_params plcdparams)
{
int pixelplace;
unsigned int addr; jz2440_lcd_pin_init(); /* [17:8]: clkval, vclk = HCLK / [(CLKVAL+1) x 2]
* 9 = 100M /[(CLKVAL+1) x 2], clkval = 4.5 = 5
* CLKVAL = 100/vclk/2-1
* [6:5]: 0b11, tft lcd
* [4:1]: bpp mode
* [0] : LCD video output and the logic enable/disable
*/
int clkval = (double)HCLK/plcdparams->time_seq.vclk/-+0.5;
int bppmode = plcdparams->bpp == ? 0xb :\
plcdparams->bpp == ? 0xc :\
0xd; /* 0xd: 24bpp */
LCDCON1 = (clkval<<) | (<<) | (bppmode<<) ; /* [31:24] : VBPD = tvb - 1
* [23:14] : LINEVAL = line - 1
* [13:6] : VFPD = tvf - 1
* [5:0] : VSPW = tvp - 1
*/
LCDCON2 = ((plcdparams->time_seq.tvb - )<<) | \
((plcdparams->yres - )<<) | \
((plcdparams->time_seq.tvf - )<<) | \
((plcdparams->time_seq.tvp - )<<); /* [25:19] : HBPD = thb - 1
* [18:8] : HOZVAL = 列 - 1
* [7:0] : HFPD = thf - 1
*/
LCDCON3 = ((plcdparams->time_seq.thb - )<<) | \
((plcdparams->xres - )<<) | \
((plcdparams->time_seq.thf - )<<); /*
* [7:0] : HSPW = thp - 1
*/
LCDCON4 = ((plcdparams->time_seq.thp - )<<); /* 用来设置引脚极性, 设置16bpp, 设置内存中象素存放的格式
* [12] : BPP24BL
* [11] : FRM565, 1-565
* [10] : INVVCLK, 0 = The video data is fetched at VCLK falling edge
* [9] : HSYNC是否反转
* [8] : VSYNC是否反转
* [7] : INVVD, rgb是否反转
* [6] : INVVDEN
* [5] : INVPWREN
* [4] : INVLEND
* [3] : PWREN, LCD_PWREN output signal enable/disable
* [2] : ENLEND
* [1] : BSWP
* [0] : HWSWP
*/ pixelplace = plcdparams->bpp == ? () : |\
plcdparams->bpp == ? () : |\
(<<); /* 8bpp */
LCDCON5 = (plcdparams->pins_pol.vclk<<) |\
(plcdparams->pins_pol.rgb<<) |\
(plcdparams->pins_pol.hsync<<) |\
(plcdparams->pins_pol.vsync<<) |\
(plcdparams->pins_pol.de<<) |\
(plcdparams->pins_pol.pwren<<) |\
(<<) | pixelplace; /* framebuffer地址 */
/*
* [29:21] : LCDBANK, A[30:22] of fb
* [20:0] : LCDBASEU, A[21:1] of fb
*/
addr = plcdparams->fb_base & ~(<<);
LCDSADDR1 = (addr >> ); /*
* [20:0] : LCDBASEL, A[21:1] of end addr
*/
addr = plcdparams->fb_base + plcdparams->xres*plcdparams->yres*plcdparams->bpp/;
addr >>=;
addr &= 0x1fffff;
LCDSADDR2 = addr;//
} void s3c2440_lcd_controller_enalbe(void)
{
/* 背光引脚 : GPB0 */
GPBDAT |= (<<); /* pwren : 给LCD提供AVDD */
LCDCON5 |= (<<); /* LCDCON1'BIT 0 : 设置LCD控制器是否输出信号 */
LCDCON1 |= (<<);
} void s3c2440_lcd_controller_disable(void)
{
/* 背光引脚 : GPB0 */
GPBDAT &= ~(<<); /* pwren : 给LCD提供AVDD */
LCDCON5 &= ~(<<); /* LCDCON1'BIT 0 : 设置LCD控制器是否输出信号 */
LCDCON1 &= ~(<<);
} struct lcd_controller s3c2440_lcd_controller = {
.name = "s3c2440",
.init = s3c2440_lcd_controller_init,
.enalbe = s3c2440_lcd_controller_enalbe,
.disable = s3c2440_lcd_controller_disable,
}; void s3c2440_lcd_contoller_add(void)
{
register_lcd_controller(&s3c2440_lcd_controller);
}