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MIPI屏适配

100ASK-D1-H_DualDisplay-DevKit V11

1. 显示适配

1.1 修改设备树

1.1.1 修改内核设备树

进入目录:

cd /home/ubuntu/tina-d1-h/device/config/chips/d1-h/configs/nezha/linux-5.4

修改board.dts:

&lcd0 {
lcd_used = <1>;

lcd_driver_name = "tft08006";
lcd_backlight = <100>;
lcd_if = <4>;

lcd_x = <480>;
lcd_y = <800>;
lcd_width = <52>;
lcd_height = <52>;
lcd_dclk_freq = <25>;

lcd_pwm_used = <1>;
lcd_pwm_ch = <0>;
lcd_pwm_freq = <1000>;
lcd_pwm_pol = <0>;
lcd_pwm_max_limit = <255>;

lcd_hbp = <10>;
lcd_ht = <515>;
lcd_hspw = <5>;
lcd_vbp = <20>;
lcd_vt = <830>;
lcd_vspw = <5>;

lcd_dsi_if = <0>;
lcd_dsi_lane = <2>;
lcd_lvds_if = <0>;
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>;
lcd_fsync_en = <0>;
lcd_fsync_act_time = <1000>;
lcd_fsync_dis_time = <1000>;
lcd_fsync_pol = <0>;

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

lcd_gpio_0 = <&pio PG 13 GPIO_ACTIVE_HIGH>;
pinctrl-0 = <&dsi4lane_pins_a>;
pinctrl-1 = <&dsi4lane_pins_b>;
};

根据原理图:

image-20240612100907483

可以查看到,mipi屏的pwm通道引脚是PB5,设备树中搜索PB5,发现有I2C设备树节点占用,需要把status位设置为disabled

image-20240612101517315

lcd0设备树节点中的pwm通道是pwm0,即把pwm0设备树节点的引脚改为相应的PB5引脚:

image-20240612102006981

1.1.2 修改uboot设备树

进入目录:

/home/ubuntu/tina-d1-h/device/config/chips/d1-h/configs/nezha

修改uboot-board.dts:

&lcd0 {
lcd_used = <1>;

lcd_driver_name = "tft08006";
lcd_backlight = <100>;
lcd_if = <4>;

lcd_x = <480>;
lcd_y = <800>;
lcd_width = <52>;
lcd_height = <52>;
lcd_dclk_freq = <25>;

lcd_pwm_used = <1>;
lcd_pwm_ch = <0>;
lcd_pwm_freq = <1000>;
lcd_pwm_pol = <0>;
lcd_pwm_max_limit = <255>;

lcd_hbp = <10>;
lcd_ht = <515>;
lcd_hspw = <5>;
lcd_vbp = <20>;
lcd_vt = <830>;
lcd_vspw = <5>;

lcd_dsi_if = <0>;
lcd_dsi_lane = <2>;
lcd_lvds_if = <0>;
lcd_lvds_colordepth = <0>;
lcd_lvds_mode = <0>;
lcd_frm = <0>;
lcd_hv_clk_phase = <0>;
lcd_hv_sync_polarity= <0>;
lcd_io_phase = <0x0000>;
lcd_dsi_te = <0>;
lcd_gamma_en = <0>;
lcd_bright_curve_en = <0>;
lcd_cmap_en = <0>;
lcd_fsync_en = <0>;
lcd_fsync_act_time = <1000>;
lcd_fsync_dis_time = <1000>;
lcd_fsync_pol = <0>;

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

lcd_gpio_0 = <&pio PG 13 GPIO_ACTIVE_HIGH>;
pinctrl-0 = <&dsi4lane_pins_a>;
pinctrl-1 = <&dsi4lane_pins_b>;
};

1.2 内核配置

修改内核驱动:

进入目录:

~/tina-d1-h/lichee/linux-5.4/drivers/video/fbdev/sunxi/disp2/disp/lcd

在这里100ASK_T113-PRO开发板适配4寸MIPI屏-Tina SDK - Allwinner / T113s3-PRO - 嵌入式开发问答社区可以下载到相应的驱动,替换到TinaSDK里面的tft08006.ctft08006.h

并修改如下:

image-20240612151024793

执行ckernel,进入内核配置界面:

m kernel_menuconfig

选上屏幕显示驱动TFT08006

image-20240612103812320

选上支持显示框架驱动:

image-20240612104726602

"DISP Driver Support"关乎显示驱动框架的整体启用,而"LCD panels select"则专注于在这个框架下选择和配置具体的LCD面板硬件。前者是基础支持层,后者是具体应用层。

1.3 uboot配置

修改uboot下的驱动:

进入目录:

~/tina-d1-h/lichee/brandy-2.0/u-boot-2018/drivers/video/sunxi/disp2/disp/lcd

在这里100ASK_T113-PRO开发板适配4寸MIPI屏-Tina SDK - Allwinner / T113s3-PRO - 嵌入式开发问答社区可以下载到相应的驱动,替换到TinaSDK里面的tft08006.ctft08006.h

并修改如下:

image-20240612151222377

执行cboot,进入uboot配置界面:

make menuconfig

选上屏幕显示驱动:

image-20240612105444757

选上支持显示框架驱动:

image-20240612105619723

mipi屏幕显示需要先在uboot阶段初始化。

1.4 显示测试

为了方便测试屏幕显示,可以选上TinaSDK自带的lvgl例程。

执行croot,进入配置界面:

make menuconfig

选上lvgl例程:

image-20240612110411286

编译make,打包pack

烧录到板子后,执行lv_examples 1:

image-20240612160004693

2. 触摸适配

2.1 修改内核设备树

根据原理图:

image-20240612165243110

可以查看:

TP_INT→PB6;TP_RESET→PB4;DSI_SCL→PB0;DSI_SDA→PB1;

进入:

vi /home/ubuntu/tina-d1-h/device/config/chips/d1-h/configs/nezha/linux-5.4/board.dts

image-20240612165938653

看到PB0、PB1引脚对应的是twi2设备树节点。所以需要在twi2设备树节点中添加触摸屏设备树节点。

&twi2 {
clock-frequency = <400000>;
pinctrl-0 = <&twi2_pins_a>;
pinctrl-1 = <&twi2_pins_b>;
pinctrl-names = "default", "sleep";
dmas = <&dma 45>, <&dma 45>;
dma-names = "tx", "rx";
status = "okay";

ctp@38 {
compatible = "focaltech,fts";
reg = <0x38>;
status = "okay";
interrupt-parent = <&pio>;
interrupts = <PB 6 IRQ_TYPE_LEVEL_LOW>;
focaltech,reset-gpio = <&pio PB 4 GPIO_ACTIVE_HIGH>;
focaltech,irq-gpio = <&pio PB 6 IRQ_TYPE_LEVEL_LOW>;
focaltech,max-touch-number = <5>;
focaltech,display-coords = <0 0 480 800>;
focaltech,reg_vdd = <0x0000001f>;
focaltech,reg_avdd = <0x0000001f>;
};
};

如果原来有同样地址为0x38的I2C设备和触摸设备的节点时,可以注释或者删除。

2.2 添加触摸驱动

Tina_SDK自带相应的触摸驱动,只需修改内核配置,把驱动编译进系统。

执行ckernel进入内核目录。

执行m kernel_menuconfig,进入内核配置界面,选上Focaltech Touchscreen

image-20240612173551080

执行croot,进入SDK根目录,执行make menuconfig进入配置界面,把触摸驱动模块添加进文件系统中:

image-20240612173955162

2.3 修改触摸驱动

在测试过程中,发现触摸点(x,y)不对,需要修改驱动程序。

进入目录:

tina-d1-h/lichee/linux-5.4/drivers/input/touchscreen/focaltech_touch

修改:

vim focaltech_core.c

两处修改:

  • fts_input_dev_report_a函数中修改,找到相应的位置:
#原来的
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->au16_x[i]);
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->au16_y[i]);

#修改的
input_report_abs(data->input_dev, ABS_MT_POSITION_X, -(event->au16_x[i] - 480));
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, -(event->au16_y[i] - 800));
  • fts_input_dev_report_b函数中修改,找到相应的位置:
#原来的
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->au16_x[i]);
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->au16_y[i]);

#修改的
input_report_abs(data->input_dev, ABS_MT_POSITION_X, -(event->au16_x[i] - 480));
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, -(event->au16_y[i] - 800));

2.4 修改lvgl驱动配置文件

如果在lvgl的例程上测试触摸功能,需要进入目录:

cd /home/ubuntu/tina-d1-h/package/gui/littlevgl-8/lv_examples/src

修改:

vim lv_drv_conf.h

image-20240612180115093

如果之前配置过lvgl例程,需要进入目录:

cd /home/ubuntu/tina-d1-h/out/d1-h-nezha/compile_dir/target

删除lv_examples,再进行编译打包烧录。

开发板上执行lv_examples 0,测试:

image-20240613115843250