SPI communication while debuging

[Aldo1]

Hi,

I using STM32F407IG in IAR Embedded workbench.

When I debug the program the SPI communication does not work.

what could be the reason?

Without debug the SPI work

[Aldo1]

I didn't check

[Andrew Neil]

You need to check!

[Aldo1]

Is there anything else I can do except for checking the lines?

how debug mode can affect the communication? maybe I can change the clock or the bound rate in some way that can help?

[Andrew Neil]

Well, what's happening on the lines is fundamental to the operation of the SPI - so you really need to know!

[Aldo1]

But I know that the communication works properly in normal working condition (not in debugging), so, somehow the debugging mode affect the communication. how the debugger affect it?

[Andrew Neil]

That's what you need to find out!

It's your system - so you need to be leading the investigation.

You know your system - we don't, and you've given previous little information.

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@Aldo1 wrote:

 how the debugger affect it?

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It really shouldn't - apart from the obvious effects of halting execution.

Does your code contain anything which detects the presence of the debugger, and changes things based on that?