The table below gives the allowed values of the pre-emption priority and subpriority according
to the Priority Grouping configuration performed by NVIC_PriorityGroupConfig function
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NVIC_PriorityGroup | NVIC_IRQChannelPreemptionPriority | NVIC_IRQChannelSubPriority | Description
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NVIC_PriorityGroup_0 | 0 | 0-15 | 0 bits for pre-emption priority
| | | 4 bits for subpriority
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NVIC_PriorityGroup_1 | 0-1 | 0-7 | 1 bits for pre-emption priority
| | | 3 bits for subpriority
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NVIC_PriorityGroup_2 | 0-3 | 0-3 | 2 bits for pre-emption priority
| | | 2 bits for subpriority
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NVIC_PriorityGroup_3 | 0-7 | 0-1 | 3 bits for pre-emption priority
| | | 1 bits for subpriority
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NVIC_PriorityGroup_4 | 0-15 | 0 | 4 bits for pre-emption priority
| | | 0 bits for subpriority
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