STM32中優先級HAL級代碼分析

1. 代碼

void HAL_NVIC_SetPriority(IRQn_Type IRQn, uint32_t PreemptPriority, uint32_t SubPriority)
{ 
  uint32_t prioritygroup = 0x00U;
  
  /* Check the parameters */
  assert_param(IS_NVIC_SUB_PRIORITY(SubPriority));
  assert_param(IS_NVIC_PREEMPTION_PRIORITY(PreemptPriority));
  
  prioritygroup = NVIC_GetPriorityGrouping();
  
  NVIC_SetPriority(IRQn, NVIC_EncodePriority(prioritygroup, PreemptPriority, SubPriority));
}

__STATIC_INLINE void __NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
{
  if ((int32_t)(IRQn) >= 0)
  {
    NVIC->IP[((uint32_t)IRQn)]               = (uint8_t)((priority << (8U - __NVIC_PRIO_BITS)) & (uint32_t)0xFFUL);
  }
  else
  {
    SCB->SHP[(((uint32_t)IRQn) & 0xFUL)-4UL] = (uint8_t)((priority << (8U - __NVIC_PRIO_BITS)) & (uint32_t)0xFFUL);
  }
}

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 RSERVED1[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;
           

stm32f103xb.h

/*!< Interrupt Number Definition */
typedef enum
{
/******  Cortex-M3 Processor Exceptions Numbers ***************************************************/
  NonMaskableInt_IRQn         = -14,    /*!< 2 Non Maskable Interrupt                             */
  HardFault_IRQn              = -13,    /*!< 3 Cortex-M3 Hard Fault Interrupt                     */
  MemoryManagement_IRQn       = -12,    /*!< 4 Cortex-M3 Memory Management Interrupt              */
  BusFault_IRQn               = -11,    /*!< 5 Cortex-M3 Bus Fault Interrupt                      */
  UsageFault_IRQn             = -10,    /*!< 6 Cortex-M3 Usage Fault Interrupt                    */
  SVCall_IRQn                 = -5,     /*!< 11 Cortex-M3 SV Call Interrupt                       */
  DebugMonitor_IRQn           = -4,     /*!< 12 Cortex-M3 Debug Monitor Interrupt                 */
  PendSV_IRQn                 = -2,     /*!< 14 Cortex-M3 Pend SV Interrupt                       */
  SysTick_IRQn                = -1,     /*!< 15 Cortex-M3 System Tick Interrupt                   */

/******  STM32 specific Interrupt Numbers *********************************************************/
  WWDG_IRQn                   = 0,      /*!< Window WatchDog Interrupt                            */
  PVD_IRQn                    = 1,      /*!< PVD through EXTI Line detection Interrupt            */
  TAMPER_IRQn                 = 2,      /*!< Tamper Interrupt                                     */
  RTC_IRQn                    = 3,      /*!< RTC global Interrupt                                 */
  FLASH_IRQn                  = 4,      /*!< FLASH global Interrupt                               */
  RCC_IRQn                    = 5,      /*!< RCC global Interrupt                                 */
  EXTI0_IRQn                  = 6,      /*!< EXTI Line0 Interrupt                                 */
  EXTI1_IRQn                  = 7,      /*!< EXTI Line1 Interrupt                                 */
  EXTI2_IRQn                  = 8,      /*!< EXTI Line2 Interrupt                                 */
  EXTI3_IRQn                  = 9,      /*!< EXTI Line3 Interrupt                                 */
  EXTI4_IRQn                  = 10,     /*!< EXTI Line4 Interrupt                                 */
  DMA1_Channel1_IRQn          = 11,     /*!< DMA1 Channel 1 global Interrupt                      */
  DMA1_Channel2_IRQn          = 12,     /*!< DMA1 Channel 2 global Interrupt                      */
  DMA1_Channel3_IRQn          = 13,     /*!< DMA1 Channel 3 global Interrupt                      */
  DMA1_Channel4_IRQn          = 14,     /*!< DMA1 Channel 4 global Interrupt                      */
  DMA1_Channel5_IRQn          = 15,     /*!< DMA1 Channel 5 global Interrupt                      */
  DMA1_Channel6_IRQn          = 16,     /*!< DMA1 Channel 6 global Interrupt                      */
  DMA1_Channel7_IRQn          = 17,     /*!< DMA1 Channel 7 global Interrupt                      */
  ADC1_2_IRQn                 = 18,     /*!< ADC1 and ADC2 global Interrupt                       */
  USB_HP_CAN1_TX_IRQn         = 19,     /*!< USB Device High Priority or CAN1 TX Interrupts       */
  USB_LP_CAN1_RX0_IRQn        = 20,     /*!< USB Device Low Priority or CAN1 RX0 Interrupts       */
  CAN1_RX1_IRQn               = 21,     /*!< CAN1 RX1 Interrupt                                   */
  CAN1_SCE_IRQn               = 22,     /*!< CAN1 SCE Interrupt                                   */
  EXTI9_5_IRQn                = 23,     /*!< External Line[9:5] Interrupts                        */
  TIM1_BRK_IRQn               = 24,     /*!< TIM1 Break Interrupt                                 */
  TIM1_UP_IRQn                = 25,     /*!< TIM1 Update Interrupt                                */
  TIM1_TRG_COM_IRQn           = 26,     /*!< TIM1 Trigger and Commutation Interrupt               */
  TIM1_CC_IRQn                = 27,     /*!< TIM1 Capture Compare Interrupt                       */
  TIM2_IRQn                   = 28,     /*!< TIM2 global Interrupt                                */
  TIM3_IRQn                   = 29,     /*!< TIM3 global Interrupt                                */
  TIM4_IRQn                   = 30,     /*!< TIM4 global Interrupt                                */
  I2C1_EV_IRQn                = 31,     /*!< I2C1 Event Interrupt                                 */
  I2C1_ER_IRQn                = 32,     /*!< I2C1 Error Interrupt                                 */
  I2C2_EV_IRQn                = 33,     /*!< I2C2 Event Interrupt                                 */
  I2C2_ER_IRQn                = 34,     /*!< I2C2 Error Interrupt                                 */
  SPI1_IRQn                   = 35,     /*!< SPI1 global Interrupt                                */
  SPI2_IRQn                   = 36,     /*!< SPI2 global Interrupt                                */
  USART1_IRQn                 = 37,     /*!< USART1 global Interrupt                              */
  USART2_IRQn                 = 38,     /*!< USART2 global Interrupt                              */
  USART3_IRQn                 = 39,     /*!< USART3 global Interrupt                              */
  EXTI15_10_IRQn              = 40,     /*!< External Line[15:10] Interrupts                      */
  RTC_Alarm_IRQn              = 41,     /*!< RTC Alarm through EXTI Line Interrupt                */
  USBWakeUp_IRQn              = 42,     /*!< USB Device WakeUp from suspend through EXTI Line Interrupt */
} IRQn_Type;
           

2. USART1中斷設定

/* USART1 interrupt Init */
HAL_NVIC_SetPriority(USART1_IRQn, 6, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);
           

NVIC->IP[0x25] = (uint8_t)((6 << (8U - 4)) & (uint32_t)0xFFUL) = 0x60;

1. 資料