(STM32F4) External Interrupt

外部中斷(External Interupt) 在MCU中是很常見而且很常用到的基本function，所以就不多做解釋。不過因為每顆MCU的配置都不太一樣所以在此記錄下來。

External Interrupt 配置

 void EXIT_GPIO_Config(void)
 {
     GPIO_InitTypeDef GPIO_Config;
     EXTI_InitTypeDef EXTI_Config;
     NVIC_InitTypeDef NVIC_Config;

     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

     GPIO_Config.GPIO_Mode = GPIO_Mode_IN;
     GPIO_Config.GPIO_OType = GPIO_OType_PP;
     GPIO_Config.GPIO_Pin = GPIO_Pin_0;
     GPIO_Config.GPIO_PuPd = GPIO_PuPd_NOPULL;
     GPIO_Config.GPIO_Speed = GPIO_Speed_100MHz;
     GPIO_Init(GPIOA, &GPIO_Config);

     SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

     EXTI_Config.EXTI_Line = EXTI_Line0;
     EXTI_Config.EXTI_Mode = EXTI_Mode_Interrupt;
     EXTI_Config.EXTI_Trigger = EXTI_Trigger_Rising;
     EXTI_Config.EXTI_LineCmd = ENABLE;
     EXTI_Init(&EXTI_Config);

     NVIC_Config.NVIC_IRQChannel = EXTI0_IRQn;
     NVIC_Config.NVIC_IRQChannelSubPriority = 0x01;
     NVIC_Config.NVIC_IRQChannelPreemptionPriority = 0x01;
     NVIC_Config.NVIC_IRQChannelCmd = ENABLE;
     NVIC_Init(&NVIC_Config);

     printf("External interrupt initial finished !!\n");
 }

中斷向量內的程式碼

 void EXTI0_IRQHandler(void)
 {
     if(EXTI_GetFlagStatus(EXTI_Line0) != RESET)
     {
         printf("interrupt test\n");
         EXTI_ClearITPendingBit(EXTI_Line0);
     }
 }

主程式

 /* Private variables ---------------------------------------------------------*/
 __IO uint32_t status;

 int main(void)
 {
     LED_Config();
     Delay_Init();            /* initialize delay function */
     USART_Config();
     EXIT_GPIO_Config();
     printf("STM32F4 External Function test\n");

     while()
     {
         status = GPIOA->IDR & GPIO_Pin_0;
         if(status)
         GPIOD->ODR |= GPIO_Pin_12;
         else
         GPIOD->ODR &= ~GPIO_Pin_12;
         DelayMs();
     }
 }