HyperPixel 2" Round Touch Driver

Pre-requisites

You must install the HyperPixel 2r drivers which enable an i2c bus for the touch IC - https://github.com/pimoroni/hyperpixel2r

Make sure you edit /boot/config.txt and add :disable-touch after hyperpixel2r, like so:

dtoverlay=hyperpixel2r:disable-touch

This disables the Linux touch driver so Python can talk to the touch IC.

Installing

Stable library from PyPi:

• Just run pip3 install hyperpixel2r

In some cases you may need to use sudo or install pip with: sudo apt install python3-pip

Latest/development library from GitHub:

• git clone https://github.com/pimoroni/hyperpixel2r-python
• cd hyperpixel2r-python
• sudo ./install.sh

SDL/Pygame on Raspberry Pi

pygame.error: No video mode large enough for 640x480

The version of Pygame shipped with Raspberry Pi OS doesn't like non-standard resolutions like 480x480. You can fake a 640x480 standard display by forcing HDMI hotplug, and then just to a 480x480 region to display on HyperPixel 2.0" round. In /boot/config.txt:

# Force 640x480 video for Pygame / HyperPixel2r
hdmi_force_hotplug=1
hdmi_mode=1
hdmi_group=1

Usage

Set up touch driver instance:

touch = Touch(bus=11, i2c_addr=0x15, interrupt_pin=27):

Touches should be read by decorating a handler with @touch.on_touch.

The handler should accept the arguments touch_id, x, y and state.

• touch_id - 0 or 1 depending on which touch is tracked
• x - x coordinate from 0 to 479
• y - y coordinate from 0 to 479
• state - touch state True for touched, False for released

For example:

@touch.on_touch
def handle_touch(touch_id, x, y, state):
    print(touch_id, x, y, state)