Stm32 NVIC interrupt priority management

stm32 share 92 A break , Include 10 Kernel interrupts and 82 Maskable interrupts , In the Chinese Reference Manual 10.2 Search for .

1. Interrupt management method

First , Group interrupts , Group 0~4, secondly , Set a preemption priority and response priority for each interrupt , The packet configuration is in the register SCB->AIRCR Middle configuration .

Group	AIRCR（10:8）	IP   bit  (7:4) Distribution	Distribution results
0	111	0：4	0 Bit preemption priority ,4 Bit response priority
1	110	1：3	1 Bit preemption priority ,3 Bit response priority
2	101	2：2	2 Bit preemption priority ,2 Bit response priority
4	100	3：1	3 Bit preemption priority ,1 Bit response priority
4	011	4：0	4 Bit preemption priority ,0 Bit response priority

2. Interrupt priority grouping

Call function void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)

void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
{
 
  assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
  
 
  SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
}

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

3. Set each interrupt priority

Call function

void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct);
//NVIC_InitTypeDef* It includes //
NVIC_IRQChannel;// passageway 
NVIC_IRQChannelPreemptionPriority;// preemption 
NVIC_IRQChannelSubPriority;// Response priority 
NVIC_IRQChannelCmd;// Can make 



NVIC_InitTypeDef NVIC_InitStructure;// Defining structure 
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//  A serial port  1  interrupt 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//  Preemption priority is  1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;//  Sub priority bit  2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//IRQ  Channel enable 
NVIC_Init(&NVIC_InitStructure); //  Initialize... According to the parameters specified above  NVIC  register