[参考译文] AM625：为定制 AM625 SOM 配置 TSC2046

尊敬的 Aditya：

我已将您的问题分配给相关专家、他们会很快回复您。

此致、

尼蒂卡

您好、Nick。

这是我的 DTS 函数

&main_spi0 {
	pinctrl-names = "default";
	pinctrl-0 = <&tsspi0_pins_default>;
	status = "okay";
	#address-cells = <1>;
	#size-cells = <0>;
	ti,pindir-d0-out-d1-in = <0>;

	tsc2046@0 {
		pinctrl-names = "default";
		pinctrl-0 = <&vdd_mmc1_pins_default>;

		reg = <0>;    / CS0 /
	        compatible = "ti,tsc2046";
        	interrupt-parent= <&main_gpio0>;
	        interrupts = <41 GPIO_ACTIVE_LOW>;
        	spi-max-frequency = <1250000>;
		pendown-gpio = <&main_gpio0 41 GPIO_ACTIVE_LOW>;
		vcc-supply = <&vcc_3v3_sys>;

		ti,x-min = /bits/ 16 <0>;
		ti,x-max = /bits/ 16 <800>;
		ti,y-min = /bits/ 16 <0>;
        	ti,y-max = /bits/ 16 <480>;
        	ti,x-plate-ohms = /bits/ 16 <40>;
        	//ti,y-plate-ohms = /bits/ 16 <200>;
        	ti,pressure-max = /bits/ 16 <255>;
/*
        	ti,vref-delay-usecs = <20000>;
        	ti,vref-mv      = <3300>;
		ti,keep-vref-on    =  <1>;

        	ti,debounce-rep =  <1>;
        	ti,debounce-tol =  <30>;
        	ti,debounce-max =  <10>;
        
        	ti,settle-delay-usec  = /bits/ 16 <150>;
		ti,penirq-recheck-delay-usecs = /bits/ 16 <20000>;
            
		touchscreen-x-mm    = <115>;
		touchscreen-y-mm    = <86>;
*/
		wakeup-source;
	};
};

//TOUCH-Start
	tsspi0_pins_default: tsspi0-pins-default {
		pinctrl-single,pins = <
			AM62X_IOPAD(0x1bc, PIN_OUTPUT, 7) / (A14) SPI0_CLK /
			AM62X_IOPAD(0x1c0, PIN_OUTPUT, 0) / (B13) SPI0_D0 /
			AM62X_IOPAD(0x1c4, PIN_INPUT, 0) / (B14) SPI0_D1 /
			AM62X_IOPAD(0x1b4, PIN_OUTPUT, 0) /* (A13) SPI0_CS0 | GPIO1_15*/
		>;
	};

	tsc_Int_Busy_pins_default: tsc-Int-pins-default {
		pinctrl-single,pins = <
			AM62X_IOPAD(0xa8, PIN_INPUT, 7) / (M21) GPIO0_41 /
			AM62X_IOPAD(0xac, PIN_INPUT, 7) / (L21) GPIO0_42 /
		>;
	};
//End

[    1.493093] ads7846 spi3.0: touchscreen, irq 335
[    1.498125] input: ADS7846 Touchscreen as /mailto:devices/platform/bus@f0000/20100000.spi/spi_master/spi3/spi3.0/input/input0

您好！

是否有关于进一步配置 TSC2046的任何更新？

谢谢。此致、
Aditya Tandulwadkar

您好、Aditya：

对延迟回复深表歉意。 我没有这些器件需要自行测试、但我明天会更仔细地查看您的 devicetree 设置、以查看是否有任何可能需要更改的内容。

此致、

尼克

您好、Nick、

我在定制 AM625 SOM 上启用了电阻式触控技术、取得了成功。 但现在我想对 AM625 SOM 的触控进行校准、该器件具有 TSC2046触控控制器 IC

谢谢。此致、
Aditya Tandulwadkar

您好、Aditya：

1) 1)要确认、您现在能够看到触摸输入事件？ 您最终做了哪些更改来修复它？

过去、我使用 evtest 来检查触控输入、如本主题所示： https://e2e.ti.com/support/processors-group/processors/f/processors-forum/862817/am3358-touchscreen-error/3197806#3197806 

2) 2)您在显示屏上使用什么软件？ 威兰/韦斯顿？  EGFLS？  滑块？ 还有其他问题吗？

此致、

尼克

您好、Nick。

1)=>下面给出的行对我有用：
     触摸屏大小 x =<4096>；
     触摸屏大小 y =<4096>；

我还使用过 evtest 工具、它可以识别显示屏各个角落的触摸、但如何使用这些数据进行校准呢？

2)=>我正在使用的平台是 X11公路显示上的 linuxfb。

谢谢。此致、
Aditya Tandulwadkar

2024年2月28日编辑：该响应中的信息似乎不适用于 AM62x。 请参考我稍后的答复：
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1322404/am625-configure-tsc2046-for-custom-am625-som/5063378#5063378 

您好、Aditya：

几年前、Weston 校准保存在校准文件中。 您可以删除旧校准数据、然后校准工具将在启动时运行。 以下这些旧线程可能会有所帮助：
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/723728/linux-am4378-touchscreen-calibration-problem
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/495706/am572x-touch-screen-calibration 

我链接到的 wiki 文本在这里：

How to Recalibrate the Touchscreen

Weston based Graphic System
Where is the ws-calibrate.rules file?
The Processor SDK Linux moves the Weston calibration file for the touchscreen from the default location of /etc/udev/rules.d/ws-calibrate.rules to instead be placed at /run/media/mmcblk0p1/ws-calibrate.rules if the SD device is present. This was done to allow user's to easily delete this file and force a recalibration without requiring a Linux PC to mount the file system or a serial console to access the device. In this case the ws-calibrate.rules file is now written to a FAT partition of the SD card, which can be mounted on both Windows or Linux.

If the ws-calibrate.rules file is created at /run/media/mmcblk0p1/ws-calibrate.rules, and there is not already a file in /etc/udev/rules.d/ws-calibrate.rules then the file is also copied to the old default location.

In the case that there is no SD card available then the ws-calibrate.rules file will be written to the default /etc/udev/rules.d/ws-calibrate.rules.

Recalibrating by Deleting ws-calibrate.rules
To trigger touchscreen re-calibration, both ws-calbration.rules files need to be deleted. The ws-calbration.rules file which is now written to the FAT partition of the SD card can be deleted by simply inserting the SD card into a PC and deleting the ws-calbration.rules file found on the first partition (assuming the first partition is a FAT partition) and we also need to delete /etc/udev/rules.d/ws-calibrate.rules from the filesystem. After both ws-calibration.rules files are removed, you will be asked to calibrate the touchscreen when the Weston is launched at the first time or relaunched by issuing "/etc/init.d/weston start" command at the console.

Alternatively, you may delete the above listed files directly from the EVM's console by issuing the following commands at EVM's Linux prompt, and reboot the EVM to allow recalibration of the LCD.

 rm /etc/udev/rules.d/ws-calibrate.rules
 rm /run/media/mmcblk0p1/ws-calibrate.rules
 reboot
 
 Non-Weston based Graphic System
Where is the pointercal file?
The Processor SDK Linux moves the calibration file for the touchscreen from the default location of /etc/pointercal to instead be placed at /run/media/mmcblk0p1/pointercal if the SD device is present. This was done to allow user's to easily delete this file and force a recalibration without requiring a Linux PC to mount the file system or a serial console to access the device. In this case the pointercal file is now written to a FAT partition of the SD card, which can be mounted on both Windows or Linux.

If the pointercal file is created at /run/media/mmcblk0p1/pointercal, and there is not already a file in /etc/pointercal then the file is also copied to the old default location. This is to prevent requiring the export of the TSLIB_CALIBFILE variable as described in later sections of this document.

In the case that there is no SD card available then the pointercal file will be written to the default /etc/pointercal location.

Recalibrating by Deleting pointercal
Because the pointercal file is now written to the FAT partition of the SD card recalibrating the touchscreen can be done by simply inserting the SD card into a PC and deleting the pointercal file found on the first partition (assuming the first partition is a FAT partition). When the system is then rebooted you will be asked to calibrate the touchscreen.

Recalibrating over Serial Console
If you do have access to the serial console you can always recalibrate the touchscreen using the ts_calibrate command as normal. However, in this case if you already have a pointercal file on the SD card you will need to export the TSLIB_CALIBFILE variable to point to that location before you run ts_calibrate. i.e.

target# export TSLIB_CALIBFILE=/run/media/mmcblk0p1/pointercal
target# ts_calibrate
NOTE: If you have Matrix or any other GUI application already running you should stop that application (How to Stop Matrix) before running ts_calibrate so that you can see the calibration screen.

Exporting TSLIB_CALIBFILE
The environment variable TSLIB_CALIBFILE is used by the tslib package to indicate the location of the pointercal file. The default value for TSLIB_CALIBFILE is /etc/pointercal. If you are writing a program that uses tslib you should make sure that you export TSLIB_CALIBFILE to point to the location of your pointercal file (as indicated in the previous section), or that you place a copy of the pointercal file at the default /etc/pointercal location.

我不确定这些信息现在是否仍然适用于 AM62x？

此致、

尼克

您好、Nick。

感谢您提供上述信息。 但它对我没有太大帮助。
我的触控坐标出错了

谢谢。此致、
Aditya Tandulwadkar

您好、Aditya：

我正在自行设置一个可在上面运行测试的屏幕(与您的屏幕不同、它在这里进行了说明： https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/linux/How_to_Guides/Target/How_to_enable_Microtips_LVDS_Panel_on_AM62_SK_EVM.html)。

在我完成这一设置后、请向我提供更多信息、说明您已尝试进行校准的内容以及观察到的结果。

此致、

尼克

您好、Nick。

我正在使用的显示屏是7英寸 TFT RGB 显示屏、有800×480像素。 它支持24位数据、即 RGB888。

另一方面,运行 evtest 实用程序后,我能够识别触摸的所有角落和不同的点显示,但当我想在它上执行 QT 应用程序,与 linuxfb 平台或任何其他平台

eglfs、linuxfb、minimal、minimalegl、offscreen、 vnc、wayland-EGL、wayland、xcb  

在任何这些平台上、单击使用 QT 的任何按钮后、触控识别错误。

现在、我不明白如何设置触摸事件的正确参数？

谢谢。此致、

Aditya Tandulwadkar  

您好、Aditya：

我将继续在我身边做这件事。 我星期一在度假、我的硬件设置将在星期三准备就绪。 但是、我建议您尝试在网上搜索其他资源、以便使用您感兴趣的任何软件平台校准触摸屏。

我可以提供有关如何使用在 SDK 中启用的默认软件校准 Microtips 显示面板的 TI EVM 的指导。 但您的解决方案可能与我在这里可以测试的解决方案不同。

无论哪种方法、我们两个人都运行测试、而不是等待我在我身边取得进展、这样的速度都会更快。

此致、

尼克

您好、Nick。

是的、我正在自行尝试校准触摸、如果有任何进展、将在此处进行更新

谢谢。此致、
Aditya Tandulwadkar