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BluePill and Jlink connectivity

Thsl
Associate

‎2025-07-23 6:48 AM - last edited on ‎2025-07-23 6:56 AM by

hi

I'm using an STM32F103C8T6 (Blue Pill) with a SEGGER J-Link for programming and debugging. I attempted to enable SWV for runtime variable monitoring by connecting PB3 (SWO) to the J-Link SWO pin, but it didn't work.

Is there any way to use SWV without relying on Serial-to-USB (USART) on this MCU? Any guidance would be appreciated.

Thsl_0-1753277193428.png

 

 

 
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Andrew Neil
Super User

‎2025-07-23 6:58 AM

BluePill is not an ST product and will (almost) certainly not have a genuine STM32.

For J-Link support, ask Segger:

https://www.segger.com/support/technical-support/

https://forum.segger.com/ 

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.
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