stm32串口控制led亮灭代码

以下是基于STM32的串口控制LED亮灭的简单代码：

#include "stm32f4xx.h"

//串口初始化
void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    //使能GPIOA和USART1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    //将Tx引脚(PA9)和Rx引脚(PA10)复用为USART1
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    //将USART1的Tx和Rx引脚复用到GPIOA
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);

    //配置USART参数
    USART_InitStruct.USART_BaudRate = 9600;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_Init(USART1, &USART_InitStruct);

    //使能USART1中断
    NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_Init(&NVIC_InitStruct);

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    USART_Cmd(USART1, ENABLE);
}

//延时函数
void delay_ms(__IO uint32_t nCount)
{
    uint32_t TimingDelay = 0;
    TimingDelay = nCount;
    while(TimingDelay !=0 );
}

int main(void)
{
    USART1_Init();
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    while(1)
    {
        if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET) {
            uint16_t ch = USART_ReceiveData(USART1);

            if(ch == 'o') {
                GPIO_SetBits(GPIOD, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
                delay_ms(2000);
                GPIO_ResetBits(GPIOD, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
            }
        }
    }
}

//USART1中断处理函数
void USART1_IRQHandler(void)
{
    //接收到数据时调用
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {
        GPIO_ToggleBits(GPIOD, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
        USART_ClearITPendingBit(USART1, USART_IT_RXNE);
    }
}

在此例程中，我们将PA9和PA10引脚复用为USART1串口，并在PD12、PD13、PD14和PD15引脚上连接LED。当从串口上接收到字母“o”时，LED会闪烁两秒钟。如果要控制LED以另一种方式亮灭，你需要更改这段代码。