SPI communication while debuging

Aldo1 · ‎2024-03-07

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 · ‎2024-03-11

I didn't check

Andrew Neil · ‎2024-03-11

You need to check!

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.

Aldo1 · ‎2024-03-11

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 · ‎2024-03-11

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

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.

Aldo1 · ‎2024-03-11

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 · ‎2024-03-11

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.

@Aldo1 wrote:
how the debugger affect it?

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?

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.