STM32F4使用串口中断识别字符串控制LED灯亮灭

好的，我可以为您提供相关的代码示例。首先，您需要在STM32F4上启用串口和中断功能。以下是一个基本的示例代码：

#include "stm32f4xx.h"
#include <string.h>

#define LED_PIN GPIO_Pin_13
#define LED_GPIO_PORT GPIOD
#define LED_GPIO_CLK RCC_AHB1Periph_GPIOD

#define USART_TX_PIN GPIO_Pin_9
#define USART_RX_PIN GPIO_Pin_10
#define USART_GPIO_PORT GPIOA
#define USART_GPIO_CLK RCC_AHB1Periph_GPIOA
#define USART_CLK RCC_APB1Periph_USART2
#define USART_BAUDRATE 9600

volatile char received_string[50];
volatile int string_index = 0;
volatile int string_complete = 0;

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(LED_GPIO_CLK, ENABLE);

  GPIO_InitStructure.GPIO_Pin = LED_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(LED_GPIO_PORT, &GPIO_InitStructure);

  RCC_AHB1PeriphClockCmd(USART_GPIO_CLK, ENABLE);

  GPIO_InitStructure.GPIO_Pin = USART_TX_PIN | USART_RX_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(USART_GPIO_PORT, &GPIO_InitStructure);

  GPIO_PinAFConfig(USART_GPIO_PORT, GPIO_PinSource9, GPIO_AF_USART2);
  GPIO_PinAFConfig(USART_GPIO_PORT, GPIO_PinSource10, GPIO_AF_USART2);
}

void USART_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(USART_CLK, ENABLE);

  USART_InitStructure.USART_BaudRate = USART_BAUDRATE;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART2, &USART_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

  USART_Cmd(USART2, ENABLE);
}

void USART2_IRQHandler(void)
{
  if (USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
  {
    char received_char = USART_ReceiveData(USART2);
    if (received_char == '\n')
    {
      received_string[string_index] = '\0';
      string_index = 0;
      string_complete = 1;
    }
    else
    {
      received_string[string_index] = received_char;
      string_index++;
    }
    USART_ClearITPendingBit(USART2, USART_IT_RXNE);
  }
}

int main(void)
{
  GPIO_Configuration();
  USART_Configuration();

  while (1)
  {
    if (string_complete)
    {
      if (strcmp(received_string, "LED ON") == 0)
      {
        GPIO_SetBits(LED_GPIO_PORT, LED_PIN);
        string_complete = 0;
      }
      else if (strcmp(received_string, "LED OFF") == 0)
      {
        GPIO_ResetBits(LED_GPIO_PORT, LED_PIN);
        string_complete = 0;
      }
      else
      {
        // unrecognized command
        string_complete = 0;
      }
    }
  }
}

在上面的代码中，我们使用USART2作为串口，并在PA9和PA10上启用了串口功能。我们使用了一个字符数组`received_string`来存储接收到的字符串，并使用`string_index`变量来跟踪接收到的字符数。当接收到的字符为换行符时，我们将字符串结尾添加`\0`并将`string_complete`标志设置为1，以表示我们已经接收到完整的字符串。在主循环中，我们检查`string_complete`标志并根据接收到的字符串控制LED灯的亮灭。

希望这个示例能对您有所帮助。