Discussing SAMD21 M0 debugging for students @MicrochipMakes @Adafruit @SEGGERMicro

Recently professor Deqing Sun of NYU/ITP wrote to Adafruit:

Let me introduce this project first, I’ve been teaching a class in NYU/ITP for a few years. Students will design and make their own Arduino board, then we do debug on it. We used to make Arduino M0 and debug with off-shelf CMSIS-DAP, but good and cheap ones are harder to get these days. This year I found dwire-debug project, and it used an ATtiny85 chip, to act as USBtinyISP and dwire adaptor. I did some optimization to his project and ported it onto a CH552/CH551 chip, which has native High-speed USB that can boost speed to 2X~3X.

At this moment, the best free IDE to do Arduino debugging should be VScode, I’ve done a merged PR and the user will not need to modify anything in VScode. They just use a project template or modify their project setting and it will work. I’ve done a tutorial with Attiny85 on Github.

Currently, I’m planning to put this board into my next class.

Ladyada responds:

Hi Deqing, great to hear from you!

The design looks nice, we’ve moved on from ‘m328 8-bit micros to more powerful chips so we can run CircuitPython which is a lot easier to develop with. for a great CMSIS-DAP we recommend the JLink mini – its a complete JLink at $20 which is a great price for something that always works and with just about any ARM 🙂

We’ll look at the CH552, it would be interesting if it could be a generic USB to I2C/SPI/SWD/UART/GPIO converter!


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