Creating a UI on a microcontroller: Part 8

This week I'm back working on my 'rod for my own back' project, ie. making a library to display a useful user interface over the UART of a generic microcontroller.

This week I've started on actually using it for its intended purpose, faking up a retro mainframe computer on ESP8266/ESP32. Trying to refactor my original code for this application to use the library has shown up a few of things.

First I was definitely right to pull out all the code and turn it into a generic library. Secondly it was missing a few features I need but thirdly and most annoyingly it still has lots of bugs.

In particular I had created lots of bugs with redrawing changing items or things that appear, disappear or change frequently. The main application is too complicated to troubleshoot with so I wrote this trivial alarm clock. You set the time and alarm with the +/- under each digit and when they match it turns red, rings the bell and a cancel button appears.

Trivial as this application is, it's really helped with the troubleshooting and I've added a load more functions, one of which changes the title bar of the terminal emulator, if allowed. It's all boilerplate, not fancy algorithms, but I still get a real sense of satisfaction in controlling an AVR Arduino with the mouse and keyboard on the computer it's plugged in to.

Here's a little video of it in action.

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