@gaixin wrote:
use stlink V2 or stlink V3?
Yes.
For a V2, just be sure to get a Genuine one.
You can see the full range of development tools on the 'Tools & Software' tab of the Product Page:
https://www.st.com/en/microcontrollers-microprocessors/stm32c091cc.html#tools-software
PS:
The full range of ST-Links is here:
https://www.st.com/en/development-tools/hardware-debugger-and-programmer-tools-for-stm32/products.html
See also: TN1235 - Overview of ST-LINK derivatives
Note that there are several variants of ST-Link V3 - from low-cost to fully-featured.
Even the cheapest V3 (STLINK-V3MINIE) is more versatile than a V2 - wider operating voltage range, and has a VCP (Virtual COM Port).
Note that the NUCLEO-C092RC comes with a built-in ST-Link.
A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
