[其他芯片] 米尔-T133测试评-屏幕适配

yvwei 2023-9-10 18:51 楼主

# 米尔-T133测试评-屏幕适配

编译完SDK后，体验了一番总感觉少了屏幕非常不舒服，从其他的开发板里翻出来一块7寸的lvds的屏幕，今天我就来点亮体验一下。

![image-20230910150109641](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/1.png)

这是个单通道lvds，我们可以看到开发板的J6的座子恰好也是单通道lvds的接口，我根据引脚定义给屏幕画了个简单的转接板。

![](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/2.jpg)

结果接上一顿调试发现屏幕一直花屏，可能是连接线太长了，导致信号有衰减，后面通过不得不通过J7的双通道lvds接口上，用杜邦线和屏幕连接点屏。

![](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/3.jpg)

硬件连接完成之后通过修改，内核和uboot的设备树文件就可以了。

首先根据屏幕的时序修改，设备树文件：

![](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/4.png)

内核设备树修改：

```bash
vi kernel/linux-5.4/arch/arm/boot/dts/myir-t113-lvds.dtsi
```

```c
//single LVDS0
&lcd0 {
  lcd_used    = <1>;

lcd_driver_name = "default_lcd";
  lcd_backlight   = <100>;
  lcd_if    = <3>;

//  lcd_x     = <1024>;
//  lcd_y     = <600>;
//  lcd_width   = <154>;
//  lcd_height    = <86>;
//  lcd_dclk_freq   = <49>;

lcd_x     = <1024>;
   lcd_y     = <600>;
   lcd_width   = <150>;
   lcd_height    = <94>;
   lcd_dclk_freq   = <51>;

lcd_pwm_used  = <1>;
  lcd_pwm_ch    = <2>;
  lcd_pwm_freq  = <50000>;
  lcd_pwm_pol   = <1>;
  lcd_pwm_max_limit = <255>;
  
  
//  lcd_hbp     = <160>;
//  lcd_ht    = <1324>;
//  lcd_hspw    = <116>;
//  lcd_vbp     = <24>;
//  lcd_vt    = <629>;
//  lcd_vspw    = <3>;

lcd_hbp     = <160>;
  lcd_ht    = <1344>;
  lcd_hspw    = <70>;
  lcd_vbp     = <35>;
  lcd_vt    = <650>;
  lcd_vspw    = <1>;

lcd_lvds_if   = <1>;
  lcd_lvds_colordepth = <0>;
  lcd_lvds_mode   = <0>;
  lcd_frm     = <0>;
  lcd_hv_clk_phase  = <0>;
  lcd_hv_sync_polarity= <0>;
  lcd_gamma_en  = <0>;
  lcd_bright_curve_en = <0>;
  lcd_cmap_en   = <0>;

deu_mode    = <0>;
  lcdgamma4iep  = <22>;
  smart_color   = <90>;

pinctrl-0 = <&lvds0_pins_a>;
  pinctrl-1 = <&lvds0_pins_b>;
};
```

uboot设备树修改：

```bash'
vi brandy/brandy-2.0/u-boot-2018/arch/arm/dts/myir-t113-lvds.dtsi
```

```c
//single LVDS0
&lcd0 {
  lcd_used    = <1>;

lcd_driver_name = "default_lcd";
  lcd_backlight   = <100>;
  lcd_if    = <3>;

//  lcd_x     = <1024>;
//  lcd_y     = <600>;
//  lcd_width   = <154>;
//  lcd_height    = <86>;
//  lcd_dclk_freq   = <49>;

lcd_x     = <1024>;
   lcd_y     = <600>;
   lcd_width   = <150>;
   lcd_height    = <94>;
   lcd_dclk_freq   = <51>;

lcd_pwm_used  = <1>;
  lcd_pwm_ch    = <2>;
  lcd_pwm_freq  = <50000>;
  lcd_pwm_pol   = <1>;
  lcd_pwm_max_limit = <255>;

//  lcd_hbp     = <160>;
//  lcd_ht    = <1324>;
//  lcd_hspw    = <116>;
//  lcd_vbp     = <24>;
//  lcd_vt    = <629>;
//  lcd_vspw    = <3>;
  
  
    lcd_hbp     = <160>;
  lcd_ht    = <1344>;
  lcd_hspw    = <70>;
  lcd_vbp     = <35>;
  lcd_vt    = <650>;
  lcd_vspw    = <1>;

deu_mode    = <0>;
  lcdgamma4iep  = <22>;
  smart_color   = <90>;

pinctrl-0 = <&lvds0_pins_a>;
  pinctrl-1 = <&lvds0_pins_b>;
};
```

编译打包：

```bash
./build.sh
./build.sh pack
```

启动板发现开机logo已经出来了：

![](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/5.jpg)

花屏测试

```
cat /dev/urandom > /dev/fb0
```

![](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/6.jpg)

colorbar 测试

```
echo 8 > /sys/class/disp/disp/attr/colorbar
```

![](https://yuwei-img.oss-cn-hangzhou.aliyuncs.com/Linux%E5%BC%80%E5%8F%91/%E7%B1%B3%E5%B0%94T133%E6%B5%8B%E8%AF%84/%E7%B1%B3%E5%B0%94T33%E6%B5%8B%E8%AF%84-%E5%B1%8F%E5%B9%95%E9%80%82%E9%85%8D/7.jpg)