Hi all,

The STM32C5 microcontrollers feature an ARM Cortex M33F core with clock 
speeds up to 144 MHz. In addition to the usual ADC and DAC, they also 
include operational amplifiers, comparators, and a delay block. DSP 
instructions, an FPU , and the CORDIC coprocessor enable fast signal 
processing. Three models also include Ethernet.

The WeAct STM32C552VET6 100-Pin Core Board is offered on Aliexpress 
starting at €6.

The STM32C5 series was advertised in 2026 as a low-cost alternative to 
Chinese competitors. It was released alongside a new HAL2 and the new 
Cube MX2. Neither is backward compatible. Arduino does not yet support 
the STM32C5.

If someone is searching for instructions not using Cube HAL, then my 
private (non commercial) homepage might help:

https://stefanfrings.de/stm32/stm32c5.html

Klick on the "translate" link in the upper right corner below the 
butterfly.

It seems that there is no other website available providing similar 
instructions. The website was written in German, but Google Translator 
does a pretty good job.

P.S.
If you don't like it, you don't have to read it.