Linux下移植LCD驱动



使用Linux3.2.81内核

4.3寸LCD

 

1. 修改arch/arm/mach-s3c2440/mach-smdk2440.c

   staticstruct s3c2410fb_display smdk2440_lcd_cfg __initdata = {

    

   .lcdcon5   =S3C2410_LCDCON5_FRM565 |

                         S3C2410_LCDCON5_INVVLINE |

                         S3C2410_LCDCON5_INVVFRAME |

                         S3C2410_LCDCON5_PWREN |

                         S3C2410_LCDCON5_HWSWP,

    

   .type                  =S3C2410_LCDCON1_TFT,

   //根据LCD数据手册

   .width               = 480,

   .height              = 272,

    

   .pixclock  = 101111,        

    .xres       = 480,

   .yres                  = 272,

   .bpp         = 16,

   .left_margin    = 2,  /* for HFPD*/

   .right_margin = 2,   /* for HBPD*/

   .hsync_len       = 42,         /*for HSPW*/

   .upper_margin        = 2,    /* for VFPD*/

   .lower_margin         = 2,   /* for VBPD*/

   .vsync_len        = 10,         /*for VSPW*/

   };

    

   pixclock的计算：
   DOTCLK = fframe × (X + HBP + HFP+HSPW) × (Y +VBP + VFP+VSPW)  //fframe是屏幕刷新频率（本开发板60HZ）

    

    

   staticstruct s3c2410fb_mach_info smdk2440_fb_info __initdata = {

   .displays  =&smdk2440_lcd_cfg,

   .num_displays =1,

   .default_display = 0,

    

   //#if 0

   /* currently setup bydownloader */

   .gpccon            = 0xaaaaaaaa,

   .gpccon_mask= 0xffffffff,

   .gpcup              = 0xffffffff,

   .gpcup_mask  = 0xffffffff,

   .gpdcon            = 0xaaaaaaaa,

   .gpdcon_mask= 0xffffffff,

   .gpdup              = 0xffffffff,

   .gpdup_mask  = 0xffffffff,

   //#endif

    

   //.lpcsel            = ((0xCE6) & ~7) | 1<<4,   //这是三星的LCD才会使用到的

   };

    

    

   staticvoid __init smdk2440_machine_init(void)

   {

   s3c24xx_fb_set_platdata(&smdk2440_fb_info);

   s3c_i2c0_set_platdata(NULL);

   //添加下面三行

   writel((readl(S3C2410_GPBCON)& ~(3)) | 1, S3C2410_GPBCON);

   writel((readl(S3C2410_GPBDAT)| 1), S3C2410_GPBDAT);     //背光控制

   writel((readl(S3C2410_GPGCON)| (3<<8)), S3C2410_GPGCON); //电源控制

    

   platform_add_devices(smdk2440_devices,ARRAY_SIZE(smdk2440_devices));

   smdk_machine_init();

   }

   并且添加#include <asm/io.h>头文件

 

1. 执行make menuconfig

   Device Driversà

              Graphicssupportà

                       <*>Support for frame buffer devicesà

                                [*]  Enable firmware EDID

                                -*-  Enable Video Mode Handling Helpers

                                <*> S3C24X0 LCD framebuffer support

                       Consoledisplay driver supportà

                                <*>Framebuffer Console support

                                [*]Select compiled-in fonts

                                [*]  VGA 8x8 font

                                [*]  VGA 8x16 font

                       [*]Bootup logoà

                                [*]  Standard 224-color Linux logo

3、编译重新下载

注意：屏幕没显示是因为没有初始化电源控制脚和背光控制脚。