STM32f103最小系統板 

PC13 接一個LED小燈

首先配置LED燈

void LED_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
	//初始化PC13為推輓式輸出
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_Init(GPIOC, &GPIO_InitStructure);
}
 

然後配置按鍵鍵盤為上拉式輸入和配置EXTI函式

void EXTI_KEY_Init(void)//配置PB11為下降沿觸發
{
	GPIO_InitTypeDef GPIO_InitStructure;
	EXTI_InitTypeDef EXTI_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
	//配置管腳時鐘和複用時鐘
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);

	//配置GPIO為上拉輸入
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	//配置GPIO口為外部中斷模式
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource11);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource10);
	
	//配置EXTI_LINE10中斷觸發模式

	EXTI_InitStructure.EXTI_Line = EXTI_Line10;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStructure);

	EXTI_InitStructure.EXTI_Line = EXTI_Line11;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStructure);
	
	//配置EXTI的中斷優先順序
	NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
}
 

void EXTI15_10_IRQHandler(void)
{
	if(EXTI_GetFlagStatus(EXTI_Line10) == 1)     //判斷哪個按鍵輸入

	{
		LED = 0;
		EXTI_ClearFlag(EXTI_Line10);
	}

	if(EXTI_GetFlagStatus(EXTI_Line11) == 1)     //判斷哪個按鍵輸入
	{
		LED = 1;
		EXTI_ClearFlag(EXTI_Line11);
	}
}

在主函式裡初始化LED EXTI函式

int main(void)
{
	NVIC_Configuration();
	LED_Init();
	EXTI_KEY_Init();
	delay_init();
	while(1)
	{
	
	}
}