[W8BH] attended a talk by another ham, [W8TEE] that showed a microcontroller sending and receiving Morse code. He decided to build his own, and documented his results in an 8 part tutorial. He’s using the Blue Pill board and the resulting device sends code with paddles, sends canned text, provides an LCD with a rotary knob menu interface, and even has an SD card for data storage.
All the code is on GitHub. If you are interested in Morse code or in learning how to write a pretty substantial application using the Blue Pill and the Arduino IDE (or any other similar processor), this is a great exposition that is also a practical tool.
[W8BH] takes good advantage of breakout boards with things such as the displays and jacks on them. Of course, you don’t absolutely have to use those, but it does make life easier. You can see [W8TEE’s] version posted in an online forum.
The parts of the tutorial all build on each other, so you start out simple and get deeper and deeper. The tutorials are PDF files, but they are well organized and easy to read.
We’ve done our tutorials and videos on the Blue Pill. If you don’t want to rely on the Arduino IDE, there are ways around that, too.
Blue Pill header pic: Popolon [CC BY-SA 4.0]
Oh nice, this is quite close to what I was looking for.
The W8BH Morse Tutor has some pretty cool features, such as an ebook2cw translator that plays plain text ebooks from the SD card, interactive sessions with a dual lever paddle, the Koch Method in 40 lessons, practice copying letters, numbers, punctuation, and more! This is a very well thought-out project. There is also a ‘port’ to the Mega2560 Pro Mini at: https://github.com/muurtikaar/mega-morse-tutor