My son and I were working on an Adafruit NeoTrellis M4 Mainboard over the holidays. This amazing little device puts a NeoPixel + an Audio board + a USB port along with a 120 MHz Cortex M4 Core and a mic amplifier and you can program it with CircuitPython. CircuitPython is open source and on Github at https://github.com/adafruit/circuitpython. “CircuitPython is an education friendly open source derivative of MicroPython.” It works with a bunch of boards including this NeoTrellis and it’s just lovely for teaching and learning.
As with a lot of these small boards, when you plug a NeoTrellis into a your machine via USB you’ll get new disk drive that pops up. All you have to do to “deploy” your code is copy it to your drive. Even better, why not just edit the code place?
Fire up VS Code and File | Open Folder and open the Disk Drive of the NeoTrellis and open (or create) a code.py file. Then from the Command Palette (Ctrl-Shift-P) in VS Code select Arduino > Initialize. If you get an error you may need to set up the path to your Arduino IDE. If you installed it from the Windows Store like we did you may find it in a weird path. We set the arduino.path like this:
"arduino.path": "C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_188.8.131.52_x86__mdqgnx93n4wtt"
The NeoTrellis M4 also shows up as a COM port so you can look at its Serial Output for debugging purposes as if it were an Arduino (because it is underneath). You then Arduino > Select a COM Port from the Command Palette and it will create a file called .vscode/arduino.json in your folder that will look like this:
Of course, we could putty into the COM Port but since I’m using this as a learning tool with my 11 year old, I find that a single window that shows both the console and the code help them focus, rather than managing multiple windows.
At this point we have a nice Developer Inner Loop going. That inner loop for us (the developers) is that we can write some code, hit save (Ctrl-S) and get immediate feedback. The application restarts when it detects the code.py file has changed and any debug (print) statements appear in the console immediately.
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