Earlier today I did the third stream in the Serpano series, this time we focused on the MCU, and as a bonus we managed to squeeze in a quick display and button test.

As you can see, the DC-DC Buck is still bodge city, but the SAMD51 MCU, QSPI Flash and the display are all there, lookin' good!

After soldering those up, I flashed a uf2 bootloader on the SAMD51 using OpenOCD and a CMSIS-DAP dongle and then I made a quick new board define for Serpano in CircuitPython.

That was enough to get the screen going, which I did, by doing a quick draw test, looks good!

We still have a few things to solder + test: the battery charging, the i2c pot used to control the adjustable voltage rails, and the current sensing chip so we can measure the current usage of the adjustable voltage rail.

Stay tuned for more info!