rt82display 0.5.2

CLI tool to upload GIFs to Epomaker RT82 keyboard LCD screen

RT82 Display CLI

Upload GIFs to your Epomaker RT82 keyboard's LCD screen from the command line.

Installation

Install from PyPI

pip install rt82display

This installs the CLI tool and all Python dependencies. You can immediately use rt82display list, rt82display info, and upload pre-encoded .qgif files.

Linux: udev rules (required for non-root access)

# Download the rules file from the repo
sudo curl -o /etc/udev/rules.d/99-rt82.rules \
  https://raw.githubusercontent.com/guysoft/rt82display/main/udev/99-rt82.rules
sudo udevadm control --reload-rules
sudo udevadm trigger

Then unplug and replug the keyboard.

macOS: No extra setup required.

Optional: Build the native QGIF encoder

The native encoder is needed to upload .gif files directly (auto-converts GIF to QGIF). Without it you can still upload pre-encoded .qgif files.

git clone https://github.com/guysoft/rt82display.git
cd rt82display/wasm2c_runtime
./build.sh

Requirements: A C compiler (gcc/clang). The WABT runtime headers are included in the repository.

Development install

To install from a local checkout instead of PyPI:

git clone https://github.com/guysoft/rt82display.git
cd rt82display
pip install -e .

Usage

Upload a GIF (auto-encodes to QGIF)

rt82display upload my_animation.gif

Upload a pre-encoded QGIF file

rt82display upload my_animation.qgif

Encode a GIF without uploading

rt82display encode input.gif output.qgif

List connected devices

rt82display list

Show device/protocol info

rt82display info

Example

A test GIF is included in the repository to verify your setup works:

rt82display upload capture_test.gif

Limitations

• 64KB file size limit: The RT82 firmware has a ~64KB buffer. Complex GIFs with many color transitions may exceed this limit and cause display artifacts.
• Best results: Use simple GIFs with solid colors and minimal patterns.
• If your GIF exceeds the limit, you'll see a warning but can still attempt the upload.

Alternative: Web Tool Encoding

If the native encoder doesn't work for your GIF, you can capture QGIF from the official web tool:

1. Open https://image.rdmctmzt.com/ in Chrome
2. Paste this in DevTools Console (F12):

window._p=[];const _s=HIDDevice.prototype.sendReport;HIDDevice.prototype.sendReport=function(i,d){window._p.push(Array.from(new Uint8Array(d)));return _s.call(this,i,d)};window.dl=()=>{const c=[];window._p.filter(x=>x[1]===0x19).forEach(x=>c.push(...x.slice(8)));if(!c.length){console.log('No data!');return}const a=document.createElement('a');a.href=URL.createObjectURL(new Blob([new Uint8Array(c)]));a.download='animation.qgif';a.click();console.log('Saved',c.length,'bytes')};console.log('Ready! Upload GIF, Download to Device, then run: dl()');

3. Upload your GIF and click "Download to Device"
4. Run dl() in console to save the QGIF file
5. Upload via CLI: rt82display upload animation.qgif

Technical Details

• Display: 240×135 RGB565
• Format: Proprietary QGIF (RLE compressed)
• Protocol: USB HID with two-stage device activation
• Encoder: wasm2c-compiled from official qgif.wasm

See PROTOCOL.md and QGIF.md for technical documentation.

Troubleshooting

See AGENTS.md for detailed troubleshooting steps.

Quick fixes:

• Device not found: Unplug and replug keyboard
• Permission denied (Linux): Install the udev rules (see Prerequisites above) and replug
• Screen stuck on "Downloading": Unplug and replug
• Garbled display: GIF likely exceeds 64KB limit, try simpler patterns