Debuging fails after HAL_Init()

[KMill]

I am debugging an application for an STMF103RCTX Using STM32CubeIDE and an STLINK v2 debugger.

This is my usual combination of tools and my usual hookup.

I find that I can start a debug session and step into main() and even step over anything befoer HAL_Init(); but as soon as I hit that the begugger connection fails.

I've made a short video showing this issue:

My hookup from the STLINK to the device is as follows:

STLINK           --->  DEVICE
Pin 2 VCC        ---> VCC
Pin 4 GND        ---> GND
Pin 7 TMS/SWDIO  ---> PA13/TMS/SWDIO (46)
Pin 9 TCLK/SWCLK ---> PA14/TCLK/SWCLK (50)
Pin 15 --> RESET ---> nRST (7)

 Any ideas? (The app runs perfectly when not trying to debug it)

[SofLit]

Hello,

What memset is doing here? The destination? the size?

if you remove that line, do you have the same behavior?

[Andrew Neil]

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@KMill wrote:

I find that I can start a debug session and step into main() and even step over anything befoer HAL_Init(); but as soon as I hit that the begugger connection fails.

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So what happens if you step into HAL_Init() ?

Where within HAL_Init() does it fail?

Does your  HAL_Init() disable the SWD pins, perhaps ... ?

https://community.st.com/t5/stm32-mcus/how-to-solve-debugger-connection-issues/ta-p/49693

[KMill]

The memset is absolutely fine, destination and size are correct.

I only added it to gove me something to step-over beforr HAL init as as test.

I will try the things mentioned in the other post...

[Karl Yamashita]

Start a new project with the bare minimum. Then see if you can debug and get past HAL_Init 

[KMill]

@Andrew Neil Thanks for the suggestion.

If I step into HAL_Init() it stops at this line:

My IOC file has reserved the pins for debug:

[Andrew Neil]

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@KMill wrote:

If I step into HAL_Init() it stops at this line:

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Look at the comment immediately above that line: you are disabling the JTAG and SWD - so obviously the debug connection will fail!

[KMill]

@Andrew Neil Aye, I see that! The question is why is it being disabled?

I am in a debug configuration, and the pins are reserved for debug! 
I had a browse through the stm32f1xx_hal_msp.c but can't see any clues as to why that is there?

[Karl Yamashita]

Are you overriding HAL_MspInit function? That function is usually defined as __weak

[KMill · Accepted solution]

OK Found it!

Somehow I have set debug to "No Debug" - Must have been me, but I don't recall ever going there!
Changing ti back to Serial Wire debug fixes it.