LWIP - HAL_ETH_Transmit stall on "Wait for data to be transmitted or timeout occurred"

[Mz.1]

Hi,

I'm using the STM32H743 device.

my main loop sends nonstop UDP messages perfectly.

I decided that I want to add a debug option that when my code has an issue and it stuck in one of the handlers (such as "HardFault_Handler") endless loops, he will send a nonstop special UDP message that indicates that a problem occurred from within the handler endless loop.

I wrote the code, but I see no udp message, when I used the IDE debug option I notice the code is stalling inside the HAL_ETH_Transmit method under the loop "/* Wait for data to be transmitted or timeout occurred */".

any idea why in the main loop the udp messages were sent with no problem and under the Handlers it stalls? do I need to initialize something before sending it?

pls, help!

thank you !!

[LCE]

That function is using the Systick with HAL_GetTick().

And the Systick is interrupt based and must have a higher priority than from the ISR where it's called from.

Anyway, calling some lwIP TX stuff from some fault handler or ISR sounds "dangerous", to put it mildly.

[Mz.1]

@Community member​ thanks!

do you have a different suggestion on how to implement correctly something similar to notify in case an error occurred?

thank you :)

[LCE]

No problem using that if "some error" occurred, seems kinda elegent.

But with your example as "HardFault_Handler" you should better find the cause for that and simply use IDE debugging why and how you got there.