RED LED On due to unknown reason!

[vbk22398]

I am using STM32F767ZI board for my projects. But due to some unknown reason, the RED led is turned ON in my nucleo board. I am sharing my code along. The code is very simple and I enabled only a single GPIO to be output. Please let me know my mistake! Where am I going wrong. What is my issue.! Also i haven't enable any GPIO that concerns RED Led. Please let me know the answer!

Thanks! 

[Andrew Neil]

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@vbk22398 wrote:

I am using STM32F767ZI board for my projects.  

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Do you mean the NUCLEO-F767ZI ?
https://www.st.com/en/evaluation-tools/nucleo-f767zi.html

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@vbk22398 wrote:

 the RED led is turned ON  

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You mean LD3 ?

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@vbk22398 wrote:

due to some unknown reason,  

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Have you tried stepping through your code in the debugger to see exactly when it comes on?

PS:

You can download the schematics from the 'CAD Resources' Tab on the board's Product Page:

https://www.st.com/en/evaluation-tools/nucleo-f767zi.html#cad-resources

[LCE]

Which LED do you mean?
Several LEDs on the Nucleo, and some connected to the on-board ST-Link, some at the power supplies...

[Andrew Neil]

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@LCE wrote:

Several LEDs on the Nucleo, and some connected to the on-board ST-Link, some at the power supplies...

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Indeed.

@vbk22398 here's the full list:

So there's four LEDs which could possibly show red ...

[vbk22398]

LD3.

[vbk22398]

@Andrew Neil I tried to enter into debug mode but it doesn't start from main, it starts outside main and if i go inside the function, then it opening a function inside the main, whilst the debug is still outside in some random line.!

[Tesla DeLorean]

Like it ended up in Error_Handler?

Or it's just running some completely different code? Double check build completes and you download correctly. 

Perhaps mass erase and confirm LED goes off.

[Andrew Neil]

That sounds like a bigger problem than a LED being unexpectedly on!

Maybe take that as a separate topic ...