1.NVIC中斷優先順序分組

可見中文參考手冊 9.1.2

幾十個中斷，怎樣管理？

搶佔優先順序&響應優先順序區別：

中斷優先順序：中斷同時到來，誰先執行（數字越小，優先順序越高）

搶佔優先順序/剝奪：搶佔優先順序高的中斷可以打斷低搶佔優先順序的任務執行；

響應/次級優先順序：搶佔優先順序相等，同時到來，響應優先順序誰高誰執行；

中斷優先順序分組函式

void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
{
  /* Check the parameters */
  assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
  
  
 
/* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
  SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
}

在misc.c檔案中

然後再定義分組函式時候

//3. 配置NVIC
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);               //配置NVIC中斷優先順序組（一般寫在主函式main開始處）
        NVIC_InitTypeDef NVIC_InitStructure;            
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority 
 
= 0;       //佔先優先順序 0
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;              //次級優先順序 0
        NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;                //中斷通道（中斷服務函式，MDK有定義，不能隨便取名）
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                 //中斷通道使能
        NVIC_Init(&NVIC_InitStructure);

MDK中 NVIC 暫存器

中斷設定相關暫存器

在core_cm3.h中找

typedef struct
{
  __IOM uint32_t ISER[8U];               /*!< Offset: 0x000 (R/W)  Interrupt Set Enable Register */
        uint32_t RESERVED0[24U];
  __IOM uint32_t ICER[8U];               /*!< Offset: 0x080 (R/W)  Interrupt Clear Enable Register */
        uint32_t RESERVED1[24U];
  __IOM uint32_t ISPR[8U];               /*!< Offset: 0x100 (R/W)  Interrupt Set Pending Register */
        uint32_t RESERVED2[24U];
  __IOM uint32_t ICPR[8U];               /*!< Offset: 0x180 (R/W)  Interrupt Clear Pending Register */
        uint32_t RESERVED3[24U];
  __IOM uint32_t IABR[8U];               /*!< Offset: 0x200 (R/W)  Interrupt Active bit Register */
        uint32_t RESERVED4[56U];
  __IOM uint8_t  IP[240U];               /*!< Offset: 0x300 (R/W)  Interrupt Priority Register (8Bit wide) */
        uint32_t RESERVED5[644U];
  __OM  uint32_t STIR;                   /*!< Offset: 0xE00 ( /W)  Software Trigger Interrupt Register */
}  NVIC_Type;

對於每個中斷怎麼設定優先順序？

void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{
  uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;
  
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
  assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));  
  assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
    
  if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
  {
    /* Compute the Corresponding IRQ Priority --------------------------------*/    
    tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
    tmppre = (0x4 - tmppriority);
    tmpsub = tmpsub >> tmppriority;

    tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
    tmppriority |=  NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;
    tmppriority = tmppriority << 0x04;
        
    NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
    
    /* Enable the Selected IRQ Channels --------------------------------------*/
    NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  }
  else
  {
    /* Disable the Selected IRQ Channels -------------------------------------*/
    NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  }
}

結構體

typedef struct
{
  uint8_t NVIC_IRQChannel;                    /*!< Specifies the IRQ channel to be enabled or disabled.
                                                   This parameter can be a value of @ref IRQn_Type 
                                                   (For the complete STM32 Devices IRQ Channels list, please
                                                    refer to stm32f10x.h file) */

  uint8_t NVIC_IRQChannelPreemptionPriority;  /*!< Specifies the pre-emption priority for the IRQ channel
                                                   specified in NVIC_IRQChannel. This parameter can be a value
                                                   between 0 and 15 as described in the table @ref NVIC_Priority_Table */

  uint8_t NVIC_IRQChannelSubPriority;         /*!< Specifies the subpriority level for the IRQ channel specified
                                                   in NVIC_IRQChannel. This parameter can be a value
                                                   between 0 and 15 as described in the table @ref NVIC_Priority_Table */

  FunctionalState NVIC_IRQChannelCmd;         /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
                                                   will be enabled or disabled. 
                                                   This parameter can be set either to ENABLE or DISABLE */   
} NVIC_InitTypeDef;

中斷使能暫存器組:ISER[8]

中斷失能暫存器組:ICER[8]

中斷掛起 、解掛暫存器組 ：ISOR[8] ICPR[8]

中斷啟用標誌位暫存器組:IABR[8]

中斷引數初始化函式

總結：