Arduino for STM32

A couple of days ago, I came across a broken flash drive PCB in the grass with USB connector still intact (later tentatively identified as a Sandisk Cruzer 8gb). I made it a challenge for myself to see if I make get the flash drive usable. I put the drive into a cheap Linux laptop (a converted Chrom...

But I had no such connectors at home that I could find, unless I were to desolder them from an old PC which is still in occasional use.

I found a Tetris Game Boy cartridge PCB on the street. After some false starts (either due to a faulty GPIO or a faulty breadboard connection), it turns out to be super-easy to read a 32K cart with a black or blue pill. Cartridge pinout is here: https://dhole.github.io/post/gameboy_cartridge_emu_1/ ...

I have ported ArduinoLib_CEClient to the libmaple-based core: https://github.com/arpruss/ArduinoLib_CEClient WIth an Arduino, the original library needs two pins and some circuitry to handle open drain communication. On STM32F1, all you need is a single 3.3V pin because open drain communication is b...

In case anybody wants to distribute binaries of a sketch, here's the trick. Set the upload method to Serial. Compile. You will get a .bin file in the temp directory (if you want to see which directory that is, turn on verbose compilation in Arduino). This .bin file can be uploaded by the user using ...

I just posted version 0.99 of the library:
- add Digitizer HID profile
- fix MIDI + serial compositing (and maybe other MIDI compositing issues)

I asked them and they said:

free shipment was for other items not for Black pill .
I am so sorry .
its for items

I also see the "Free shipping" on the website, but on the checkout the lowest shipping option is $3.38 for one and $3.86 for ten.

That's weird. When I use their shipping calculator, the cheapest shipping option for one unit is $3.38 to Texas.

I would love to hear how well the APM32 functions. It seems very promising, except the costs are a bit high for smaller quantities. I am particularly curious if USB is fully functional at the higher clock rate, and whether power usage is comparable.