halfkay-webusb

Inspired by https://github.com/keyboardio/teensy-loader.js and https://github.com/PaulStoffregen/teensy_loader_cli/

Sibling: avr109-webserial

Background

For our assistive device FABI & FLipMouse we currently develop a WebSerial based GUI to adjust the settings.

One main missing feature was the update process for the included Arduino Micro and TeensyLC.

This project aims to be a proof-of-concept for WebSerial/WebHID based TeensyLC updates (using the HalfKay bootloader.

Caveats

Because this is a simple proof of concept, some features are still missing or implemented just for TeensyLC:

• Currently only TeensyLC (tested), other blocksizes would allow all other Teensy boards
• Auto-reset to bootloader works only if there is a serial interface in your sketch.
• I just implemented one PID/VID pair for the auto-reset, I don't know if it changes, if there is a different USB feature set selected (in our case: mouse + keyboard + joystick + serial)
• The WebSerial feature of Chromium does NOT allow to open 2 ports with 1 user interaction. But the Arduino Micro running and its bootloader use 2 different PID/VIDs, so 2 user interactions are required (extra "Reset" button)

How to use

1. Select the corresponding .hex file
2. Press "Reset" and select TeensyLC device (WebSerial)
3. Press "Upload" and select the TeensyLC Bootloader device (WebUSB)

Note: if there is no device shown when "reset" is pressed, your board might be already in the upload mode, so proceed with "upload"

Acknowledgements

@noopcat for avrgirl-arduino which provided the HTML code.

@bminer for intel-hex.js which provided the Intel HEX file parser

@PaulStoffregen for the wonderful Teensy boards and the very easy bootloader mechanism, as well as internal information in teensy_loader_cli

and of course: stackoverflow :-)