STM32--EXIT例子

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通用I/O端连接到16个外部中断/事件线上,所有IO都可以作为中断输入引脚。

（注意：同一个IO位只能分配一个IO，例如：PA0,PB0,...PG0只能选择一个作为EXIT0，即不能同时作为中断输入引脚）

EXTI9_5_IRQn表示----External Line[9:5] Interrupts

GPB.9配置外外部中断IO口

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/* Enable the EXTI9_5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

}

/* Connect Key Button EXTI Line to Key Button GPIO Pin */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource9);

/* Configure Key Button EXTI Line to generate an interrupt on falling edge */
EXTI_InitStructure.EXTI_Line = EXTI_Line9;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

void EXTI9_5_IRQHandler(void)
{
   if(EXTI_GetITStatus(EXTI_Line9) != RESET)
   {
      EXTI_ClearITPendingBit(EXTI_Line9);
   }
}