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    Tina F133调试5寸RGB,整体图像很淡,有抖动波纹,今天终于踩完坑了。

    编译和烧写问题专区
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      shz18877605430 LV 6 last edited by shz18877605430

      1、前序

      • 前几天,买了个显示屏,5寸的RGB(800*480),遇到了个奇葩的问题,用了芒果的F133(MQ-R)板子,然后开启了lvgl的demo程序,发现屏幕整体图像很淡,有抖动波纹,有种撕裂的感觉,不信你看😁 。可能不是很清晰,如下:

      fe38c654-be68-4624-bcd3-4ca028bc165f-2D13F840CE14A7DBEBF4D6BB2B56EDC6.jpg

      2、过程

      • 当时出现了这个问题的时候,我首先看了设备树,发现设备树该改的都改了呀,也没看出啥毛病,然后一直在哪里乱调,群里问了大佬,得到了一点点的灵感,看来还是要上RGB显示屏的手册才行,如下图所示。

      4b

      • 接着对着手册改,发现改了也没用,然后用了示波器测量dclk,发现时钟频率是48Mhz,哇,这么嗨高,手册显示最高也就27Mhz,以是我想了想,要不把频率降下来看看,然后打了两个补丁:
      0001-disp-support-dynamic-adjust-tcon_div.patch:
          放置到 lichee/linux-5.4 目录中执行 
          git apply 0001-disp-support-dynamic-adjust-tcon_div.patch
      
      0001-disp-support-dynamic-adjust-tcon_div-uboot.patch:
          放置到 lichee/brandy-2.0/u-boot-2018 目录中执行 
          git apply 0001-disp-support-dynamic-adjust-tcon_div-uboot.patch
      

      补丁在这个全志服务平台上:https://open.allwinnertech.com/#/sdk/0?menuID=36

      如图所示:

      GMXOQI.png

      • 接着依旧于事无补,没用啊,算了,打了补丁就不管了,过了两天,带着板子到公司的示波器上测测波形,靠,还是48Mhz,无语,只能看看有没有同步吧,接着在uboot命令行下用了fdt print命令看了一下设备树的参数,发现和内核的设备树一样,这下扯淡了,证明改的设备树内啥问题啊,都更新进去了,于是我还是不死心,坚决拿uboot的设备树开刀,改成了和内核的参数一样,烧录进去,啪,示波器测量,24Mhz,成了。没了,请看下一集。

      贴图贴图,收工。

      a92879E3C3F9B7B0C138C422B5.jpg

      贴个内核设备树(uboot也是一样的)上来给大家看看:

      &lcd0 {
      	lcd_used            = <1>;
      
      	lcd_driver_name     = "default_lcd";
      	lcd_backlight       = <50>;
      	lcd_if              = <0>;
      
      	lcd_x               = <800>;
      	lcd_y               = <480>;
      	lcd_width           = <108>;
      	lcd_height          = <65>;
      	lcd_dclk_freq       = <22>;
      
      	lcd_pwm_used        = <1>;
      	lcd_pwm_ch          = <9>;
      	lcd_pwm_freq        = <50000>;
      	lcd_pwm_pol         = <0>;
      	lcd_pwm_max_limit   = <255>;
      	
      	lcd_hbp             = <12>;
      	lcd_ht              = <816>;
      	lcd_hspw            = <4>;
      	lcd_vbp             = <12>;
      	lcd_vt              = <496>;
      	lcd_vspw            = <4>;
      
      	lcd_lvds_if         = <0>;
      	lcd_lvds_colordepth = <1>;
      	lcd_lvds_mode       = <0>;
      	lcd_frm             = <0>;
      	lcd_io_phase        = <0x0000>;
      	lcd_gamma_en        = <0>;
      	lcd_bright_curve_en = <0>;
      	lcd_cmap_en         = <0>;
      
      	deu_mode            = <0>;
      	lcdgamma4iep        = <22>;
      	smart_color         = <90>;
      
      	pinctrl-0 = <&rgb18_pins_a>;
      	pinctrl-1 = <&rgb18_pins_b>;
      };
      

      // 记得改uboot的设备树,一定、一定、一定,重要的事情要说三遍!!!

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