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為推挽式輸出
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);
}
然后配置按鍵鍵盤為上拉式輸入和配置EXTI函數
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;
//配置管腳時鐘和復用時鐘
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的中斷優先級
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);
}
}
在主函數里初始化LED EXTI函數
int main(void)
{
NVIC_Configuration();
LED_Init();
EXTI_KEY_Init();
delay_init();
while(1)
{
}
}
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