HAL_Delay never exits even after increasing the priority of Systick to highest priority.

[TH.16.336]

Hi all,

I am working with the Nucleo-F446ZE board.

I generated a project with CubeMx .

At this point the project is running fine with UART interrupts and data.

I debug the project and all is working.

I need to use a delay function in my project. SO I have used HAL_Delay(20); for example.

But it never exits from that function. Debugging at it came to know it stuck in below while loop.

 while((HAL_GetTick() - tickstart) < wait)

 {

 }

Any help?I am using the Delay function inside UART ISR. Please help.

[KnarfB]

Using HAL_Delay in an ISR is rarely a good idea. Are you sure that the USART ISR prio is lower than SysTick?

[TDK]

Possibilities:

1) SysTick interrupt isnt set up or enabled

2) interrupts are disabled

3) priority of systick is less or equal to that of the uart. Note that priority of 0 is highest priority.

4) interrupts cannot preempt each other. Check priority grouping setting.

[dbgarasiya]

check your interrupt settings

[TH.16.336]

Looks like both interrupts priority was same.

This was causing the issue. Thanks for the reply. Now it's working.

[TH.16.336]

Looks like both interrupts priority was same as 0.

This was causing the issue. Thanks for the reply. Now it's working.