I am working on the K64 and added a PIT timer and system tick to the project.
I set the SysTick to trigger every 1ms with priority 0, and the PIT timer with priority 1. And the PriorityGroup is set to 0.
However, I found the SysTick ISR could not preempt the PIT ISR, the SysTick counter doesn't change in the PIT ISR.
I thought the SysTick ISR should be able to preempt other ISRs like timer, uart...
Is my understanding run? Or did I miss anything? Any suggestion for let SysTick ISR to preempt other ISR?