I wrote a tutorial for STM32C5 without HAL

It seems that WeAct will offer a smaller board in "Blue Pill" format as well. Found this on GitHub.

Nemopuk wrote:

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. A step-by-step debugging approach usually makes it much easier to identify the root cause. The same method works well when integrating components like KMQ310013M-B419(https://www.jotrin.com/product/parts/KMQ310013M_B419) into embedded designs.

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.

Thanks for sharing this excellent tutorial. It's refreshing to see detailed STM32C5 guidance without HAL. Your explanations and effort will definitely help beginners and experienced developers exploring this microcontroller series.

Thanks for your feedback.

The smaller board in "Blue Pill" format with STM32C552CET6 is now available on Aliexpress.

• https://de.aliexpress.com/item/1005012675165750.html
• https://de.aliexpress.com/item/1005012752708632.html