I am using FreeRTOS v10.3.0 for iMX RT1052.
configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY is defined as 2.
I have configured GPT2 timer for 10ms time. GPT2_IRQ is set as wakeup source from system idle.
The sequence of the code is,
start GPT2 timer → enter critical section → enter system idle mode → stay in system idle mode until GPT2_IRQ wakesup from idle mode–> GPT2_IRQ occurs → post event from ISR to task using RTOS API → exit critical section.
The code works except the posting of event from ISR. It does not work as the prio of the IRQ needs to be 3 or more(more than configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY).
If NVIC_SetPriority for GPT2_IRQ is set to 3 or more, the GPT2_IRQ gets masked because while entering critical section the BASE_PRI value gets set to 0x2.
So, I can either set the prio of the GPT2_IRQ to
A)numerical value > configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY (ex:3 or more)
B)numerical value < configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY (ex:0,1)
If I follow A) the interrupt gets masked due to BASE_PRI
and If I follow B) I cannot use RTOS API in the ISR.
Is it possible to achieve what I am doing? Please let me know If I am missing anything.