STM8L51X gpio中断

 

本文采用官方的库函数接口实现STM8L51X gpio中断

 

STM8L51X的中断向量入口函数都放在stm8l51x_it.c里面。

不同的中断对应的中断号如下(在stm8l51x_itc.h里面)：

 

typedef enum {

     FLASH_IRQn                              = (uint8_t)1,   /*!< Flashinterrupt  */

     DMA1_CHANNEL0_1_IRQn                    = (uint8_t)2,   /*!< DMAChannels 0/1 */

     DMA1_CHANNEL2_3_IRQn                    = (uint8_t)3,   /*!< DMAChannels 2/3 */

     EXTIE_F_PVD_IRQn                        = (uint8_t)5,   /*!< GPIOE/Fand PVD interrupt */

     EXTI0_IRQn                              = (uint8_t)8,   /*!< PIN0 interrupt   */

     EXTI1_IRQn                              = (uint8_t)9,   /*!< PIN1interrupt   */

     EXTI2_IRQn                              = (uint8_t)10,  /*!< PIN2interrupt   */

     EXTI3_IRQn                              = (uint8_t)11,  /*!< PIN3interrupt   */

     EXTI4_IRQn                              = (uint8_t)12,  /*!< PIN4interrupt   */

     EXTI5_IRQn                              = (uint8_t)13,  /*!< PIN5interrupt   */

     EXTI6_IRQn                              = (uint8_t)14,  /*!< PIN6interrupt   */

     EXTI7_IRQn                              = (uint8_t)15,  /*!< PIN7interrupt   */

     ADC1_COMP_IRQn                          = (uint8_t)18,  /*!

     TIM4_UPD_OVF_TRG_IRQn                   = (uint8_t)25,  /*!< TIM4Update/Overflow/Trigger interrupt */

     SPI1_IRQn                               = (uint8_t)26,  /*!< SPI1interrupt */

     #if defined (STM8L15X_MD) || defined(STM8L05X_MD_VL) || defined (STM8AL31_L_MD)

     RTC_IRQn                                = (uint8_t)4,   /*!< RTCinterrupt    */

     EXTIB_IRQn                              = (uint8_t)6,   /*!< GPIOBinterrupt  */

      EXTID_IRQn                              = (uint8_t)7,   /*!< GPIODinterrupt  */

      LCD_IRQn                                = (uint8_t)16,  /*!< LCD Driverinterrupt    */

         SWITCH_CSS_BREAK_DAC_IRQn                = (uint8_t)17,  /*!< Clock switch/CSS interrupt/TIM1 Break/DAC  interrupt */

      TIM2_UPD_OVF_TRG_BRK_IRQn               = (uint8_t)19,  /*!< TIM2Update/Overflow/Trigger/Break interrupt*/

      TIM2_CC_IRQn                            = (uint8_t)20,  /*!< TIM2 inputcaptute/output compare interrupt  */

      TIM3_UPD_OVF_TRG_BRK_IRQn               = (uint8_t)21,  /*!< TIM3Update/Overflow/Trigger/Break interrupt */

      TIM3_CC_IRQn                            = (uint8_t)22,  /*!< TIM3capture/compare interrupt  */

         TIM1_UPD_OVF_TRG_IRQn                    = (uint8_t)23,  /*!< TIM1 TIM1 Update/Overflow/Triggerinterrupt */

      TIM1_CC_IRQn                             = (uint8_t)24,  /*!< TIM1 capture/compare interrupt  */

      USART1_TX_IRQn                          = (uint8_t)27,  /*!< USART1 TXinterrupt */

      USART1_RX_IRQn                          = (uint8_t)28,  /*!< USART1 RXinterrupt */

      I2C1_IRQn                                = (uint8_t)29   /*!< I2C1 interrupt */

     #elif defined (STM8L15X_LD) || defined(STM8L05X_LD_VL)

      RTC_CSSLSE_IRQn                         = (uint8_t)4,   /*!< RTC /CSSLSE interrupt    */

      EXTIB_IRQn                              = (uint8_t)6,   /*!< GPIOB interrupt  */

      EXTID_IRQn                              = (uint8_t)7,   /*!< GPIODinterrupt  */

         SWITCH_CSS_IRQn                          = (uint8_t)17,  /*!< Clock switch/CSS interrupt/TIM1 Break/DAC  interrupt */

      TIM2_UPD_OVF_TRG_BRK_IRQn               = (uint8_t)19,  /*!< TIM2Update/Overflow/Trigger/Break interrupt*/

      TIM2_CC_IRQn                            = (uint8_t)20,  /*!< TIM2 inputcaptute/output compare interrupt  */

      TIM3_UPD_OVF_TRG_BRK_IRQn               = (uint8_t)21,  /*!< TIM3 Update/Overflow/Trigger/Breakinterrupt */

      TIM3_CC_IRQn                            = (uint8_t)22,  /*!< TIM3capture/compare interrupt  */

      USART1_TX_IRQn                          = (uint8_t)27,  /*!< USART1 TXinterrupt */

      USART1_RX_IRQn                          = (uint8_t)28,  /*!< USART1 RXinterrupt */

     I2C1_IRQn                               = (uint8_t)29   /*!< I2C1interrupt */

     #elif defined (STM8L15X_HD) || defined(STM8L15X_MDP) || defined (STM8L05X_HD_VL)

       RTC_CSSLSE_IRQn                          = (uint8_t)4,   /*!< RTC / CSSLSE interrupt    */

      EXTIB_G_IRQn                            = (uint8_t)6,   /*!< GPIOB / Ginterrupt  */

      EXTID_H_IRQn                            = (uint8_t)7,   /*!< GPIOD / Hinterrupt  */

      LCD_AES_IRQn                            = (uint8_t)16,  /*!< LCD / AESinterrupt    */

         SWITCH_CSS_BREAK_DAC_IRQn                = (uint8_t)17,  /*!< Clock switch/CSS interrupt/TIM1 Break/DAC  interrupt */

      TIM2_UPD_OVF_TRG_BRK_USART2_TX_IRQn     = (uint8_t)19,  /*!< TIM2Update/Overflow/Trigger/Break /USART2 TX interrupt*/

      TIM2_CC_USART2_RX_IRQn                  = (uint8_t)20,  /*!< TIM2capture/compare / USART2 RX interrupt  */

      TIM3_UPD_OVF_TRG_BRK_USART3_TX_IRQn     = (uint8_t)21,  /*!< TIM3Update/Overflow/Trigger/Break / USART3 TX interrupt */

      TIM3_CC_USART3_RX_IRQn                  = (uint8_t)22,  /*!< TIM3capture/compare / USART3 RX interrupt  */

         TIM1_UPD_OVF_TRG_IRQn                    = (uint8_t)23,  /*!< TIM1 TIM1 Update/Overflow/Triggerinterrupt */

      TIM1_CC_IRQn                            = (uint8_t)24,  /*!< TIM1capture/compare interrupt  */

      USART1_TX_TIM5_UPD_OVF_TRG_BRK_IRQn     = (uint8_t)27,  /*!< USART1 TX/ TIM5 Update/Overflow/Trigger/Break interrupt */

      USART1_RX_TIM5_CC_IRQn                  = (uint8_t)28,  /*!< USART1 RX/ TIM5 capture/compare interrupt */

      I2C1_SPI2_IRQn                          = (uint8_t)29   /*!< I2C1 /SPI2 interrupt */

     #endif /* STM8L15X_MD */

}IRQn_TypeDef;

 

 

1、  UART 中断

UART中断相对比价简单，直接在UART初始化的时候把中断开起来就可以了，以uart1为例：

voidUsartInit(void)

{

       SYSCFG_REMAPDeInit();

      SYSCFG_REMAPPinConfig(REMAP_Pin_USART1TxRxPortC, ENABLE);   

       STM_EVAL_COMInit(COM1, (uint32_t)115200,USART_WordLength_8b, USART_StopBits_1,     \

                  USART_Parity_No,(USART_Mode_TypeDef)(USART_Mode_Tx | USART_Mode_Rx));

 

  //读中断

  USART_ITConfig(EVAL_COM1, USART_IT_RXNE,ENABLE);//enable USART1 RX interrupt

  //写中断

  USART_ITConfig(EVAL_COM1, USART_IT_TXE,ENABLE); 

}

 

开启中断之后，那么就去捕捉中断，然后使用。

         a、读中断：当UART的RX接收到数据时，会产生一个RX中断,中断入口如下

INTERRUPT_HANDLER(USART1_RX_TIM5_CC_IRQHandler, 28)

{

     printf("\n\r USART1_RX_TIM5_CC_IRQHandler  interrupt No28 \n\r");

}

b、写中断：当我们往UART的TX 发送数据时，会产生一个TX中断，中断入口如下：

INTERRUPT_HANDLER(USART1_TX_TIM5_UPD_OVF_TRG_BRK_IRQHandler,27)

{

     printf("\n\rUSART1_TX_TIM5_UPD_OVF_TRG_BRK_IRQHandler interrupt No27 \n\r");

}

 

2、    GPIO中断

STM8L51X 有很多组GPIO，（GPIOA、GPIOB、GPIOC 等），每组GPIO由8个pin脚组成，每个pin脚我们都可以配置它为中断脚。8个pin脚对应的中断入口函数分别如下：

INTERRUPT voidEXTI0_IRQHandler(void); /* EXTI PIN0 */

 INTERRUPT void EXTI1_IRQHandler(void); /* EXTIPIN1 */

 INTERRUPT void EXTI2_IRQHandler(void); /* EXTIPIN2 */

 INTERRUPT void EXTI3_IRQHandler(void); /* EXTIPIN3 */

 INTERRUPT void EXTI4_IRQHandler(void); /* EXTIPIN4 */

 INTERRUPT void EXTI5_IRQHandler(void); /* EXTIPIN5 */

 INTERRUPT void EXTI6_IRQHandler(void); /* EXTIPIN6 */

INTERRUPT voidEXTI7_IRQHandler(void); /* EXTI PIN7 */

         模式类型如下：

         typedefenum

{

       GPIO_Mode_In_FL_No_IT      = (uint8_t)0x00,   /*!< Input floating, no externalinterrupt */

       GPIO_Mode_In_PU_No_IT      = (uint8_t)0x40,   /*!< Input pull-up, no external interrupt*/

       GPIO_Mode_In_FL_IT         = (uint8_t)0x20,   /*!< Input floating, external interrupt*/

       GPIO_Mode_In_PU_IT         = (uint8_t)0x60,   /*!< Input pull-up, external interrupt */

      GPIO_Mode_Out_OD_Low_Fast  =(uint8_t)0xA0,   /*!< Outputopen-drain, low level, 10MHz */

      GPIO_Mode_Out_PP_Low_Fast  =(uint8_t)0xE0,   /*!< Output push-pull,low level, 10MHz */

      GPIO_Mode_Out_OD_Low_Slow  =(uint8_t)0x80,   /*!< Outputopen-drain, low level, 2MHz */

      GPIO_Mode_Out_PP_Low_Slow  =(uint8_t)0xC0,   /*!< Outputpush-pull, low level, 2MHz */

      GPIO_Mode_Out_OD_HiZ_Fast  =(uint8_t)0xB0,   /*!< Outputopen-drain, high-impedance level, 10MHz */

       GPIO_Mode_Out_PP_High_Fast =(uint8_t)0xF0,   /*!< Outputpush-pull, high level, 10MHz */

      GPIO_Mode_Out_OD_HiZ_Slow  =(uint8_t)0x90,   /*!< Outputopen-drain, high-impedance level, 2MHz */

       GPIO_Mode_Out_PP_High_Slow =(uint8_t)0xD0    /*!< Outputpush-pull, high level, 2MHz */

}GPIO_Mode_TypeDef;

 

         触发条件体如下：

         typedefenum

{

 EXTI_Trigger_Falling_Low    =(uint8_t)0x00, /*!< Interrupt on Falling edge and Low level */

  EXTI_Trigger_Rising         = (uint8_t)0x01, /*!< Interrupt onRising edge only */

  EXTI_Trigger_Falling        = (uint8_t)0x02, /*!< Interrupt onFalling edge only */

  EXTI_Trigger_Rising_Falling= (uint8_t)0x03  /*!< Interrupt onRising and Falling edges */

} EXTI_Trigger_TypeDef;

 

优先级如下：

typedef enum

{

  ITC_PriorityLevel_0 =(uint8_t)0x02, /*!< Software priority level 0 (cannot be written) */

  ITC_PriorityLevel_1 =(uint8_t)0x01, /*!< Software priority level 1 */

  ITC_PriorityLevel_2 =(uint8_t)0x00, /*!< Software priority level 2 */

  ITC_PriorityLevel_3 =(uint8_t)0x03  /*!< Software prioritylevel 3 */

} ITC_PriorityLevel_TypeDef;

 

如何配置GPIO中断呢？以GPIOB组的pin3脚为例：

a、  首先需要重置一下外部中断： EXTI_DeInit()

b、  初始化GPIO

GPIO_Init(GPIOB, GPIO_Pin_3, GPIO_Mode_In_PU_IT);

这里模式类型我配置为GPIO_Mode_In_PU_IT类型

c、  配置中断触发条件：

EXTI_SetPinSensitivity(EXTI_Pin_3,EXTI_Trigger_Falling_Low)

这里配置为下降沿触发

d、  设置中断优先级

ITC_SetSoftwarePriority(EXTI3_IRQn, ITC_PriorityLevel_1);

  

经过上述配置过后，当GPIOB组的第3个pin脚电平由高电平向低电平跳变时，会产生一个中断，然后就会调中断处理接口函数INTERRUPT void EXTI3_IRQHandler(void); /* EXTI PIN3 */

 

         记得在INTERRUPTvoid EXTI3_IRQHandler(void)接口里面调用：

         EXTI_ClearITPendingBit(EXTI_IT_Pin3);清除中断。