【嵌入式开发】手把手教你4418/6818开发板屏幕修改
本文转自迅为开发平台：iTOP-4418/6818开发板 4418&6818屏幕修改分别需要修改uboot和内核，首先是修改uboot。 1.首先进入到android源码目录下： 图14418平台，需要修改uboot的文件是：u-boot/board/s5p4418/drone2/board.c，使用vi命令打开这个文件，屏幕的默认参数设置在49行到93行，如下图： 图24418暂时支持9.7寸，7寸，4.3寸屏幕，他们的设置在该文件，如下图所示的地方： 图3上图中代码的功能，首先是从uboot的环境变量里面读取出当前使用的哪款屏幕，然后根据屏幕类型选择对应分支的设置。比如屏幕的宽，高，刷新率,如果用户使用其它的屏幕，需要在此处修改（需要根据自己屏幕的参数，修改图2中的那些默认变量）（6818的修改文件是：u-boot/board/s5p6818/dronel/board.c，方法同上） 2，linux内核部分的修改：首先是文件kernel/arch/arm/plat-s5p4418/topeet/include/cfg_main.h（6818对应的文件是：kernel/arch/arm/plat-s5p6818/topeet/include/cfg_main.h）这个文件里定义里一组与屏幕相关的宏，如下所示：/*------------------------------------------------------------------------------ * Display (DPC and MLC) *//* Primary */#define CFG_DISP_PRI_SCREEN_LAYER 0#define CFG_DISP_PRI_SCREEN_RGB_FORMAT MLC_RGBFMT_A8R8G8B8#define CFG_DISP_PRI_SCREEN_PIXEL_BYTE 4#define CFG_DISP_PRI_SCREEN_COLOR_KEY 0x090909 #define CFG_DISP_PRI_VIDEO_PRIORITY 2 // 0, 1, 2, 3#define CFG_DISP_PRI_BACK_GROUND_COLOR 0x000000 #define CFG_DISP_PRI_MLC_INTERLACE CFALSE #define CFG_DISP_PRI_LCD_WIDTH_MM 154#define CFG_DISP_PRI_LCD_HEIGHT_MM 85 /* modify by cym 20150811 */#if 0#define CFG_DISP_PRI_RESOL_WIDTH 1024 // X Resolution#define CFG_DISP_PRI_RESOL_HEIGHT 600 // Y Resolution#else#define CFG_DISP_PRI_RESOL_WIDTH 800//1024 // X Resolution#define CFG_DISP_PRI_RESOL_HEIGHT 1280//768 // Y Resolution#endif/* end remove */ #define CFG_DISP_PRI_HSYNC_SYNC_WIDTH 20#define CFG_DISP_PRI_HSYNC_BACK_PORCH 160#define CFG_DISP_PRI_HSYNC_FRONT_PORCH 160#define CFG_DISP_PRI_HSYNC_ACTIVE_HIGH CTRUE#define CFG_DISP_PRI_VSYNC_SYNC_WIDTH 3#define CFG_DISP_PRI_VSYNC_BACK_PORCH 23#define CFG_DISP_PRI_VSYNC_FRONT_PORCH 12#define CFG_DISP_PRI_VSYNC_ACTIVE_HIGH CTRUE #define CFG_DISP_PRI_CLKGEN0_SOURCE DPC_VCLK_SRC_PLL2#define CFG_DISP_PRI_CLKGEN0_DIV 12 // even divide#define CFG_DISP_PRI_CLKGEN0_DELAY 0#define CFG_DISP_PRI_CLKGEN0_INVERT 0#define CFG_DISP_PRI_CLKGEN1_SOURCE DPC_VCLK_SRC_VCLK2#define CFG_DISP_PRI_CLKGEN1_DIV 1#define CFG_DISP_PRI_CLKGEN1_DELAY 0#define CFG_DISP_PRI_CLKGEN1_INVERT 0#define CFG_DISP_PRI_CLKSEL1_SELECT 0#define CFG_DISP_PRI_PADCLKSEL DPC_PADCLKSEL_VCLK /* VCLK=CLKGEN1, VCLK12=CLKGEN0 */ #define CFG_DISP_PRI_PIXEL_CLOCK 800000000/CFG_DISP_PRI_CLKGEN0_DIV #define CFG_DISP_PRI_OUT_SWAPRB CFALSE#define CFG_DISP_PRI_OUT_FORMAT DPC_FORMAT_RGB888#define CFG_DISP_PRI_OUT_YCORDER DPC_YCORDER_CbYCrY#define CFG_DISP_PRI_OUT_INTERLACE CFALSE#define CFG_DISP_PRI_OUT_INVERT_FIELD CFALSE#define CFG_DISP_LCD_MPY_TYPE 0 /*------------------------------------------------------------------------------ * LVDS *//* modify by cym 20150811 */#if 0#define CFG_DISP_LVDS_LCD_FORMAT LVDS_LCDFORMAT_VESA#else#define CFG_DISP_LVDS_LCD_FORMAT LVDS_LCDFORMAT_JEIDA#endif/* end modify */然后是文件：kernel/arch/arm/plat-s5p4418/topeet/device.c（6818对应的文件：kernel/arch/arm/plat-s5p6818/topeet/device.c）在这个文件找到函数setup_width_height_param，如下：/* add by cym 20151128 */#if 1static int __init setup_width_height_param(char *str){ if (!strncasecmp("9.7", str, 3)) { //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str);#if defined(CONFIG_TOUCHSCREEN_FT5X0X) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); ft5x0x_pdata.screen_max_x = 768; ft5x0x_pdata.screen_max_y = 1024;#endif #if defined (CONFIG_FB_NXP)#if defined (CONFIG_FB0_NXP) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); fb0_plat_data.x_resol = 1024; fb0_plat_data.y_resol = 768;#endif#endif } else if(!strncasecmp("7.0", str, 3)) {#if defined(CONFIG_TOUCHSCREEN_FT5X0X) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); ft5x0x_pdata.screen_max_x = 800; ft5x0x_pdata.screen_max_y = 1280;#endif #if defined (CONFIG_FB_NXP)#if defined (CONFIG_FB0_NXP) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); fb0_plat_data.x_resol = 800; fb0_plat_data.y_resol = 1280;#endif#endif } /* add by cym 20160222 */#if 1 else if(!strncasecmp("4.3", str, 3)) {#if defined (CONFIG_FB_NXP)#if defined (CONFIG_FB0_NXP) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); fb0_plat_data.x_resol = 480; fb0_plat_data.y_resol = 272;#endif#endif }#endif/* end add */ /* add by cym 20170810 */#if 1 else if(!strncasecmp("1024x600", str, 8)) {#if defined(CONFIG_TOUCHSCREEN_FT5X0X) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); ft5x0x_pdata.screen_max_x = 600; ft5x0x_pdata.screen_max_y = 1024; ft5x0x_i2c_bdi.irq = PB_PIO_IRQ(CFG_IO_TSC2007_TOUCH_PENDOWN_DETECT); ft5x0x_pdata.gpio_irq = CFG_IO_TSC2007_TOUCH_PENDOWN_DETECT; tsc2007_i2c_bdi.irq = NULL;//PB_PIO_IRQ(CFG_IO_TOUCH_PENDOWN_DETECT);#endif #if defined (CONFIG_FB_NXP)#if defined (CONFIG_FB0_NXP) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); fb0_plat_data.x_resol = 1024; fb0_plat_data.y_resol = 600;#endif#endif }#endif/* end add */ /* add by cym 20161104 */#if 1 else if(!strncasecmp("hdmi", str, 3)) { #if defined (CONFIG_FB_NXP)#if defined (CONFIG_FB0_NXP) //printk("fun:%s, line = %d(lcdtype:%s)\n", __FUNCTION__, __LINE__, str); fb0_plat_data.x_resol = 1920; fb0_plat_data.y_resol = 1080;#endif#endif }#endif/* end add */ //printk("fun:%s, line = %d\n", __FUNCTION__, __LINE__);}early_param("lcdtype", setup_width_height_param);#endif/* end add */这个函数根据uboot传递过来的lcdtype选择对应屏幕的设置，这里主要是修改屏幕的分辨率，如果使用其它屏幕，修改对应的分辨率就可以了。然后是文件：kernel/arch/arm/mach-s5p4418/dev-display.c（6818对应的文件：kernel/arch/arm/mach-s5p4418/dev-display.c）同样在这个文件找到函数：setup_width_height_param，如下所示：/* add by cym 20151128 */#if 1static int __init setup_width_height_param(char *str){ if (!strncasecmp("9.7", str, 3)) {#if defined (CONFIG_NXP_DISPLAY_LCD)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __lcd_vsync.h_active_len = 1024; __lcd_vsync.v_active_len = 768; __lcd_vsync.clk_div_lv0 = 14;#endif#endif #if defined (CONFIG_NXP_DISPLAY_LVDS)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __lvds_vsync.h_active_len = 1024; __lvds_vsync.v_active_len = 768; __lvds_vsync.clk_div_lv0 = 14;#endif#endif #if defined (CONFIG_NXP_DISPLAY_MIPI)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __mipi_vsync.h_active_len = 1024; __mipi_vsync.v_active_len = 768; __mipi_vsync.clk_div_lv0 = 14;#endif#endif } else if(!strncasecmp("7.0", str, 3)) {#if defined (CONFIG_NXP_DISPLAY_LCD)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __lcd_vsync.h_active_len = 800; __lcd_vsync.v_active_len = 1280;#endif#endif #if defined (CONFIG_NXP_DISPLAY_LVDS)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __lvds_vsync.h_active_len = 800; __lvds_vsync.v_active_len = 1280;#endif#endif #if defined (CONFIG_NXP_DISPLAY_MIPI)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __mipi_vsync.h_active_len = 800; __mipi_vsync.v_active_len = 1280;#endif#endif } /* add by cym 20160222 */#if 1 else if(!strncasecmp("4.3", str, 3)) {#if defined (CONFIG_NXP_DISPLAY_LCD)#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT) __lcd_vsync.h_active_len = 480; __lcd_vsync.v_active_len = 272; __lcd_vsync.clk_div_lv0 = 24; __lcd_vsync.clk_div_lv1 = 2;#endif#endif#if defined (CONFIG_NXP_DISPLAY_LVDS)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__lvds_vsync.h_active_len = 480;
__lvds_vsync.v_active_len = 272;
__lvds_vsync.clk_div_lv0 = 24;
__lvds_vsync.clk_div_lv1 = 2;
#endif
#endif
#if defined (CONFIG_NXP_DISPLAY_MIPI)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__mipi_vsync.h_active_len = 480;
__mipi_vsync.v_active_len = 272;
__mipi_vsync.clk_div_lv0 = 24;
__mipi_vsync.clk_div_lv1 = 2;
#endif
#endif
}
#endif
/* end add */
/* add by cym 20170810 */
#if 1
else if(!strncasecmp("1024x600", str, 8))
{
#if defined (CONFIG_NXP_DISPLAY_LCD)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__lcd_vsync.h_active_len = 1024;
__lcd_vsync.v_active_len = 600;
//__lcd_vsync.clk_div_lv0 = 24;
//__lcd_vsync.clk_div_lv1 = 2;
#endif
#endif
#if defined (CONFIG_NXP_DISPLAY_LVDS)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__lvds_vsync.h_active_len = 1024;
__lvds_vsync.v_active_len = 600;
//__lvds_vsync.clk_div_lv0 = 24;
//__lvds_vsync.clk_div_lv1 = 2;
#endif
#endif
#if defined (CONFIG_NXP_DISPLAY_MIPI)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__mipi_vsync.h_active_len = 1024;
__mipi_vsync.v_active_len = 600;
//__mipi_vsync.clk_div_lv0 = 24;
//__mipi_vsync.clk_div_lv1 = 2;
#endif
#endif
}
#endif
/* end add */
/* add by cym 20161104 */
#if 1
else if(!strncasecmp("hdmi", str, 3))
{
#if defined (CONFIG_NXP_DISPLAY_LCD)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__lcd_vsync.h_active_len = 1920;
__lcd_vsync.v_active_len = 1080;
#endif
#endif
#if defined (CONFIG_NXP_DISPLAY_LVDS)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__lvds_vsync.h_active_len = 1920;
__lvds_vsync.v_active_len = 1080;
#endif
#endif
#if defined (CONFIG_NXP_DISPLAY_MIPI)
#if defined(CFG_DISP_PRI_RESOL_WIDTH) && defined(CFG_DISP_PRI_RESOL_HEIGHT)
__mipi_vsync.h_active_len = 1920;
__mipi_vsync.v_active_len = 1080;
#endif
#endif
}
#endif
/* end add */
//printk("fun:%s, line = %d\n", __FUNCTION__, __LINE__);
}
early_param("lcdtype", setup_width_height_param);
#endif
/* end add */
这个函数根据uboot传递过来的lcdtype选择对应屏幕的设置，这里主要是修改屏幕的分辨率，刷新率，如果使用其它屏幕，修改对应的分辨率就可以了。
关于屏幕的设置主要就是修改上面的文件
感谢分享学习。。。 学习了，好贴，多谢分享内容 首先是修改uboot，学习了，赞 多谢分享内容，学习了，赞 多谢分享内容，学习了
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