Eth Global interrupt priority

[mangodan2003]

First off, thanks for this, no doubt saved me a tonne of time messing about.

I just had one thing missing after following the guide which looking back at it i see you had set but seemingly not listed in the config steps.

CubeMX creates config where Middleware->FREERTOS_M7->Config Parameters(tab)->LIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY deafults to 5
and System Core->NVIC1->NVIC(tab)->Ether Global Priority defaults to 0. This results in calls to osDelay never returning, and sitting in vPortValidateInterruptPriority().

Without this step the DHCP server sees a Request, sends an Offer, but then the board hangs and never sends an ACK, won't reply to pings, and indeed any call to osDelay() just gets stuck as above.

I also had to disable USB device which was enabled by default and prevented setting the clock configuration to anything remotely fast - as the boards are not fitted with an HSE (X2) and thus rely on the HSI by default. As I will be using USB eventually too I have ordered an XTAL for X2.