HAL_NVIC_GetPriority() function

External interrupt number. This parameter can be an enumerator of IRQn_Type enumeration (For the complete STM32 Devices IRQ Channels list, please refer to the appropriate CMSIS device file (stm32f4xxxx.h))

the priority grouping bits length. This parameter can be one of the following values: @arg NVIC_PRIORITYGROUP_0: 0 bits for preemption priority 4 bits for subpriority @arg NVIC_PRIORITYGROUP_1: 1 bits for preemption priority 3 bits for subpriority @arg NVIC_PRIORITYGROUP_2: 2 bits for preemption priority 2 bits for subpriority @arg NVIC_PRIORITYGROUP_3: 3 bits for preemption priority 1 bits for subpriority @arg NVIC_PRIORITYGROUP_4: 4 bits for preemption priority 0 bits for subpriority

Pointer on the Preemptive priority value (starting from 0).

Pointer on the Subpriority value (starting from 0).