LCD编程框架组织

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);
 }