Comments (6)
A124Bob
commented on August 15, 2024
2
Fixed! Touch is running!
I connected the Micro-USB (power and data) of the display to the Pi USB.
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goodtft
commented on August 15, 2024
Hello,
The touch functions Do not need any software,so we think it's a Hardware Problem.
You should make sure The Touch signal should come back to Pi via USB.
So, One end of USB is connected to one of four USB ports on the raspberry pi, and the other is connected to the USB port of the 7-inch LCD module.
and,Please use the USB cable provided in our packing.
another way, you can tested it on computer, for checking the touch functions is ok or not.
2017-04-27
goodtft
发件人：seesix <[email protected]>
发送时间：2017-04-27 00:19
主题：[goodtft/LCD-show] No touch functionality (#10)
收件人："goodtft/LCD-show"<[email protected]>
抄送："Subscribed"<[email protected]>
I have followed your installation guide using Raspbian-2017-03-02 on an Pi3b with LCD7C 1024x768 screen.
Both devices are powered from a single 5V 2.5amp power supply, the screen piggybacking power off the Pi via USB
I am able to get the screen up and running but without any Touchscreen functionality.
Anyone have an success trying to get touchscreen functions working with this screen?
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gauone
commented on August 15, 2024
Hi,
Does the touch function needs a software on a 3.5 inch RPi Display? I also have the screen running without any touch functionality… I downloaded the "Raspbian Stretch with desktop and recommended software" and I used a "dd" command without using SDFormatter or Win32DiskImager for step 1. However, I rigorously followed step 2 and 3.
Thank you for your help
gauone
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A124Bob
commented on August 15, 2024
I have followed your installation guide using Raspbian-2017-03-02 on an Pi3b with LCD7C 1024x768 screen.
Both devices are powered from a single 5V 2.5amp power supply, the screen piggybacking power off the Pi via USB
I am able to get the screen up and running but without any Touchscreen functionality.
Anyone have an success trying to get touchscreen functions working with this screen?
Have the same problem by a joy-it RB-LCD-7-2 Display (also same to Waveshare 7")
LCD is running, but touch is not operating. (Crankshaft OpenCarOS NG Alpha-5 2019-06-08)
Tried X11, Dev-Mode and install driver.
Can't put a USB-Cable between Pi and Display. The display has only Micro-USB for Power and HDMI.
tar xzvf /boot/LCD-show-160701.tar.gz
cd LCD-show/
chmod +x LCD7C-show
./LCD7C-show
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dlmiles
commented on August 15, 2024
Attempt 1) To confirm for me @A124Bob the 7" model touchscreen did not work when:
Micro USB port 1: Attached to RPI 4 (which is powered by its own USB PSU)
Micro USB port 2: Attached to another USB PSU (with current ampere rating exceeding that needed to power an RPI 4)
When in this state I get (and touchscreen not working):
$ lsusb
Bus 001 Device 006: ID 4348:55e0 WinChipHead
Attempt 2) When I disconnect that arrangement and make it:
Micro USB port 1: USB lead attached to RPI 4
Micro USB port 2: USB lead attached to RPI 4 (another port)
Now I get in this state (and touchscreen still not working):
$ lsusb
Bus 001 Device 030: ID 1a86:e2e3 QinHeng Electronics
Bus 001 Device 031: ID 1a86:e2e3 QinHeng Electronics
What is happening is in /var/log/Xorg.0.log it keeps finding the USB device twice and ping-pong:
$ grep Class /var/log/Xorg.0.log
[ 12.667] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 12.667] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 12.667] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 13.983] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 13.983] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 13.983] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 15.313] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 15.313] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 15.313] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 16.497] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 16.497] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 16.497] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 17.776] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 17.776] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 17.776] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 18.504] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 18.504] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 18.504] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 19.123] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 19.123] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 19.123] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 19.880] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 19.880] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 19.880] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 20.493] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 20.493] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 20.493] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 21.263] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "evdev touchscreen catchall"
[ 21.263] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
[ 21.263] (**) wch.cn USB2IIC_CTP_CONTROL: Applying InputClass "libinput touchscreen catchall"
Attempt 3)
When I disconnect that arrangement and make it:
Micro USB port 1: USB lead attached to RPI 4
Micro USB port 2: Disconnected
Now I get in this state (and touchscreen is working):
$ lsusb
Bus 001 Device 003: ID 1a86:e2e3 QinHeng Electronics
This information is not exactly CLEAR in the documentation, specially when the device has 2 USB connectors and talks of power usage concerns.
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humberry
commented on August 15, 2024
Some micro usb cables have only power wires and no data wires (necessary for the touch function). I checked it with lsusb, thanks a lot.
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