Debug the code using UART(USB-TTL)

[Ax111_]

I am using STM32F103(Bluepill). Since I am not able to load program to the controller through ST-LINK V2 programmer, so not able debug the code.  

I am loading the program through UART(USB-TTL)

I want to know if there is a way to debug the code using UART(USB-TTL), i want to analyze the real time memory traces.

[Andrew Neil]

"I am not able to load program to the controller through ST-LINK V2 programmer"

Because it's a bricked clone:

https://community.st.com/s/question/0D53W00001YdJPkSAN/no-st-link-connected

"I want to know if there is a way to debug the code using UART(USB-TTL)"

Wouldn't it be simpler to just get a working ST-Link (or other debug probe) ?

Anyhow, without a proper debug probe, you're left with just "printf" debugging, and/or writing patterns out to spare IO to observe on a 'scope or logic analyser.

Or maybe get/make yourself an old-school Debug Monitor:

https://interrupt.memfault.com/blog/cortex-m-debug-monitor

[Michael E]

Hello @Ax111_​ ,

You can use print on UART and "instrumentalize" the code.

If needed there is an example in Step3 of the STM32MCUwiki.

[Andrew Neil]

From that last link:

"MRI - Monitor for Remote Inspection

MRI is a debug monitor which allows the GNU debugger, GDB, to debug Cortex-M3/M4 processors. This makes it possible to debug applications running on Cortex-M devices using a full featured source level debugger with no extra hardware other than a serial connection."

https://github.com/adamgreen/mri