触摸显示屏

panel

1、属性值配置：

  • power-supply: 配置电源

  • compatible: 可以配置成以下值：
    “simple-panel”;
    “simple-panel-dsi”;

  • ddc-i2c-bus: 给DDC EDID配置I2C控制器；

  • enable-gpios: 配置panel的使能脚；

  • reset-gpios: 配置panel的复位脚；

  • backlight: 指向背光的dts配置节点；

  • reset-delay-ms: 配置reset的脉冲时延；

  • enable-delay-ms: 配置panel显示前的延时值；

  • prepare-delay-ms: 配置panel接收图像数据前的延时值；

  • disable-delay-ms: 配置panel关闭前的延时值；

  • unprepare-delay-ms: 配置panel黑屏前的延时值；

  • width-mm: 配置panel的物理宽度尺寸[mm]；

  • height-mm: 配置panel的物理高度尺寸[mm]；

  • bpc: 配置像素点位深；

  • display-timings: 配置timing节点；

  • dsi,flags: 配置panel的使用的模式；

  • dsi,format: 配置panel像素格式；

  • dsi,lanes: 配置panel使用的lane数；

  • init-delay-ms: 配置panel在初始化前的延时值；

  • panel-init-sequence:
    byte 0: dcs 数据类型
    byte 1: 指令发送之后的延时
    byte 2: 指令长度
    byte 3：数据

  • panel-exit-sequence:
    byte 0: dcs 数据类型
    byte 1: 指令发送之后的延时
    byte 2: 指令长度
    byte 3：数据

  • power-invert:配置电源反转
    if power-invert exist the panel power need to disable ldo when power on
    and enable ldo when power off otherwise it’s opposite.
    2、实例：

Example:

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panel: panel {
	compatible = "cptt,claa101wb01";
	ddc-i2c-bus = <&panelddc>;

	power-supply = <&vdd_pnl_reg>;
	enable-gpios = <&gpio 90 0>;

	backlight = <&backlight>;
};

Or:

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&dsi {
	panel@0 {
		compatible = "simple-panel-dsi";
		reg = <0>;
		backlight = <&backlight>;

		power-supply = <&vcc_lcd>;
		enable-gpios = <&gpio2 27 GPIO_ACTIVE_HIGH>;
		reset-gpios = <&gpio3 13 GPIO_ACTIVE_LOW>;

		reset-delay-ms = <120>;
		init-delay-ms = <120>;
		enable-delay-ms = <120>;
		prepare-delay-ms = <120>;
		disable-delay-ms = <120>;
		unprepare-delay-ms = <120>;

		dsi,flags = <MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
			     MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET>;
		dsi,format = <MIPI_DSI_FMT_RGB888>;
		dsi,lanes = <4>;

		panel-init-sequence = [
			39 00 10 b1 6c 15 15 24 E4 11 f1 80 e4
				 d7 23 80 c0 d2 58
			...
			05 78 01 11
			05 78 01 29
		];

		panel-exit-sequence = [
			05 00 01 28
			05 78 01 10
		];

		display-timings {
			native-mode = <&timing0>;

			timing0: timing0 {
				clock-frequency = <160000000>;
				hactive = <1200>;
				vactive = <1920>;
				hback-porch = <21>;
				hfront-porch = <120>;
				vback-porch = <18>;
				vfront-porch = <21>;
				hsync-len = <20>;
				vsync-len = <3>;
				hsync-active = <0>;
				vsync-active = <0>;
				de-active = <0>;
				pixelclk-active = <0>;
			};
		};
	};
};

display

1、display-timing 参数说明如下：

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+----------+-------------------------------------+----------+-------+
|          |        ↑                            |          |       |
|          |        |vback_porch                 |          |       |
|          |        ↓                            |          |       |
+----------#######################################----------+-------+
|          #        ↑                            #          |       |
|          #        |                            #          |       |
|  hback   #        |                            #  hfront  | hsync |
|   porch  #        |       hactive              #  porch   |  len  |
|<-------->#<-------+--------------------------->#<-------->|<----->|
|          #        |                            #          |       |
|          #        |vactive                     #          |       |
|          #        |                            #          |       |
|          #        ↓                            #          |       |
+----------#######################################----------+-------+
|          |        ↑                            |          |       |
|          |        |vfront_porch                |          |       |
|          |        ↓                            |          |       |
+----------+-------------------------------------+----------+-------+
|          |        ↑                            |          |       |
|          |        |vsync_len                   |          |       |
|          |        ↓                            |          |       |
+----------+-------------------------------------+----------+-------+

2、display-timing 节点属性值配置：

  • native-mode: The native mode for the display, in case multiple modes are
    provided. When omitted, assume the first node is the native.

3、timing 子节点属性值配置：

  • hactive, vactive: 显示器的分辨率；
  • hfront-porch, hback-porch, hsync-len: 配置水平display-timing参数，以像素为单位；
    vfront-porch, vback-porch, vsync-len: 配置垂直display-timing参数，以像素为单位；
  • clock-frequency: 配置显示时钟，以HZ为单位；
  • hsync-active: 配置 hsync 脉冲有效极性，low/high/ignored
  • vsync-active: 配置 vsync 脉冲有效极性，low/high/ignored
  • de-active: 配置 data-enable 脉冲有效极性 low/high/ignored
  • pixelclk-active: with
    - active high = drive pixel data on rising edge/
    sample data on falling edge
    - active low = drive pixel data on falling edge/
    sample data on rising edge
    - ignored = ignored
  • interlaced (bool): boolean to enable interlaced mode
  • doublescan (bool): boolean to enable doublescan mode
  • doubleclk (bool): boolean to enable doubleclock mode

All the optional properties that are not bool follow the following logic:
<1>: high active
<0>: low active
omitted: not used on hardware

4、实例，display-timing可以配置不同的信号timing，通过使用native-mode来指定使用的timing子节点，比如：

正常的使用如下：

Example:

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	display-timings {
		native-mode = <&timing0>;
		timing0: 1080p24 {
			/* 1920x1080p24 */
			clock-frequency = <52000000>;
			hactive = <1920>;
			vactive = <1080>;
			hfront-porch = <25>;
			hback-porch = <25>;
			hsync-len = <25>;
			vback-porch = <2>;
			vfront-porch = <2>;
			vsync-len = <2>;
			hsync-active = <1>;
		};
	};
```    
如果要切换display-timing，可以再定义一个timing子节点，如下：

Example:
timing1: timing {
    /* 1920x1080p24 */
    clock-frequency = <148500000>;
    hactive = <1920>;
    vactive = <1080>;
    hsync-len = <0 44 60>;
    hfront-porch = <80 88 95>;
    hback-porch = <100 148 160>;
    vfront-porch = <0 4 6>;
    vback-porch = <0 36 50>;
    vsync-len = <0 5 6>;
};

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屏幕技术文档参数
![](img/note_pic/linux_lcd)


**每个屏幕都有vbp+vfp+vs**

在填充6个参数时只需要满足关系：vbp+vfp+vs=文档值,hbp+hfp+hs=文档值,各值自行分配(通常hbp和vbp取较大值),




### 显示屏 LCD时序计算

clock-frequency 显示时钟 比如60hz刷新率
公式 ：1940* 1340 * 60 = 155976000 显示时钟可以设置成 156000000


### 触摸驱动参考

目前适配的是synaptics 触摸屏，确保触摸驱动正确配置

 i2c 设备树参考

&i2c5 {
status = “okay”;
synaptics@20 {
status = “okay”;
compatible = “synaptics,dsx-i2c”;
reg = <0x20>;
vdd-supply = <&vcc_3v3_s3>; // 对应pmu引脚或者供电引脚
avdd-supply = <&vcc_3v3_s3>;
synaptics,pwr-reg-name = “avdd”;
synaptics,bus-reg-name = “vdd”;
synaptics,ub-i2c-addr = <0x2c>;
pinctrl-0 = <&synaptics_irq>; // 中断引脚
pinctrl-1 = <&synaptics_rst>; // 复位引脚
synaptics,irq-gpio = <&gpio3 RK_PC0 GPIO_ACTIVE_HIGH>;// 这里需要注意 需要根据芯片引脚制定
synaptics,reset-gpio = <&gpio3 RK_PC1 GPIO_ACTIVE_LOW>;
synaptics,irq-on-state = <0>;
synaptics,power-delay-ms = <200>;
synaptics,reset-delay-ms = <200>;
synaptics,reset-on-state = <0>;
synaptics,reset-active-ms = <20>;

synaptics,max-y-for-2d = <1200>;
// synaptics,swap-axes = <1>;		// x和y轴是否互换 根据实际情况配置
//synaptics,x-flip = <1>;			// x轴翻转
// synaptics,y-flip = <1>;			// y轴翻转

};

};

1
中断触发方式

#define IRQ_TYPE_NONE 0
#define IRQ_TYPE_EDGE_RISING 1//上升沿触发
#define IRQ_TYPE_EDGE_FALLING 2//下降沿触发
#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)//双边沿触发
#define IRQ_TYPE_LEVEL_HIGH 4//高电平触发
#define IRQ_TYPE_LEVEL_LOW 8//低电平触发
```