https://github.com/ardera/raspberrypi-fast-ts

A faster, lower-latency, userspace touchscreen input driver for the official Raspberry Pi 7" screen.
https://github.com/ardera/raspberrypi-fast-ts

driver linux raspberry-pi raspberry-pi-4 touchscreen userspace-driver

Last synced: about 17 hours ago
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A faster, lower-latency, userspace touchscreen input driver for the official Raspberry Pi 7" screen.

• Host: GitHub
• URL: https://github.com/ardera/raspberrypi-fast-ts
• Owner: ardera
• Created: 2020-10-16T21:22:42.000Z (almost 4 years ago)
• Default Branch: master
• Last Pushed: 2022-02-18T07:48:29.000Z (over 2 years ago)
• Last Synced: 2024-09-19T02:46:01.095Z (9 days ago)
• Topics: driver, linux, raspberry-pi, raspberry-pi-4, touchscreen, userspace-driver
• Language: C
• Homepage:
• Size: 24.4 KB
• Stars: 53
• Watchers: 6
• Forks: 5
• Open Issues: 3
• Metadata Files:
  • Readme: README.md

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README

        
# raspberrypi-fast-ts

A faster, lower-latency, userspace touchscreen input driver for the official Raspberry Pi 7" screen.

#### Compatibility

Only tested on Pi 4. It's possible it works on Pi 3 too. Will not work on Pi 2 or 1.

#### Installation Instructions

```bash

$ git clone https://github.com/ardera/raspberrypi-fast-ts.git

$ cd raspberrypi-fast-ts

$ make

$ sudo make install

```

After that, the driver is installed, but not yet enabled. To enable it and disable the old driver, see the following steps. *Be aware this makes changes to `/boot/config.txt`.* The installation script is rather dumb. If your `config.txt` is heavily modified, you can apply the changes manually, just look at how the Makefile does it.

```bash

$ sudo make enable

```

If you specified `lcd_rotate=2` inside `/boot/config.txt` to rotate your display by 180 degrees, you also need to invoke `raspberrypi-fast-ts` with the `-f` option.

1. Open `/etc/systemd/system/raspberrypi-fast-ts.service` using your favorite text editor

2. find the line where it says `ExecStart=/usr/local/bin/raspberrypi-fast-ts`

3. change it to `ExecStart=/usr/local/bin/raspberrypi-fast-ts -f`

After a reboot, the new driver will be used.

#### Switching back to the old driver

To switch back to the old driver:

- remove the 5 last lines of `/boot/config.txt`

- remove the `uinput` line from `/etc/modules`

- run `sudo systemctl disable raspberrypi-fast-ts.service`

#### Backlight interface

This driver now has a backlight interface similiar to the standard sysfs one.

It's located inside `/var/tmp/raspberrypi-fast-ts`. Currently, `bl_power` and `brightness` are supported.

You can use it just like the sysfs interface, for example to change the brightness to 50%:

```

$ sudo bash

# echo 127 > /var/tmp/raspberrypi-fast-ts/brightness

# exit

```

to change it to 100% again:

```

$ sudo bash

# echo 255 > /var/tmp/raspberrypi-fast-ts/brightness

# exit 

```