DHT11驱动代码，STM32F103ZET6

以下是使用STM32CubeMX和HAL库驱动DHT11的示例代码：

#include "main.h"
#include "dht11.h"

/* DHT11数据接口引脚定义 */
#define DHT11_GPIO_PORT GPIOA
#define DHT11_GPIO_PIN GPIO_PIN_1

/* 定义DHT11的状态 */
typedef enum {
  DHT11_IDLE = 0U,
  DHT11_READY,
  DHT11_ERROR
} DHT11_StatusTypeDef;

/* 定义DHT11结构体 */
typedef struct {
  DHT11_StatusTypeDef Status;
  uint8_t Humidity;
  uint8_t Temperature;
} DHT11_HandleTypeDef;

/* 定义DHT11句柄 */
DHT11_HandleTypeDef DHT11;

/* DHT11引脚初始化 */
static void DHT11_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  /* 打开GPIOA时钟 */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /* 配置GPIOA.1为输入模式 */
  GPIO_InitStruct.Pin = DHT11_GPIO_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(DHT11_GPIO_PORT, &GPIO_InitStruct);
}

/* 延时函数 */
static void DHT11_Delay_us(uint32_t us)
{
  uint32_t cnt = us * (SystemCoreClock / 1000000) / 5;
  while (cnt--);
}

/* 读取DHT11数据 */
static HAL_StatusTypeDef DHT11_ReadData(void)
{
  uint8_t i = 0;
  uint8_t data[5] = {0};
  uint8_t checksum = 0;

  /* 发送起始信号 */
  HAL_GPIO_WritePin(DHT11_GPIO_PORT, DHT11_GPIO_PIN, GPIO_PIN_RESET);
  DHT11_Delay_us(18000);
  HAL_GPIO_WritePin(DHT11_GPIO_PORT, DHT11_GPIO_PIN, GPIO_PIN_SET);
  DHT11_Delay_us(40);

  /* 切换到输入模式 */
  GPIO_InitTypeDef GPIO_InitStruct;
  GPIO_InitStruct.Pin = DHT11_GPIO_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;

  /* 等待DHT11响应信号 */
  if (HAL_GPIO_ReadPin(DHT11_GPIO_PORT, DHT11_GPIO_PIN) == GPIO_PIN_RESET) {
    while (!HAL_GPIO_ReadPin(DHT11_GPIO_PORT, DHT11_GPIO_PIN));
    while (HAL_GPIO_ReadPin(DHT11_GPIO_PORT, DHT11_GPIO_PIN));
    /* 读取40位数据 */
    for (i = 0; i < 40; i++) {
      while (!HAL_GPIO_ReadPin(DHT11_GPIO_PORT, DHT11_GPIO_PIN));
      DHT11_Delay_us(50);
      if (HAL_GPIO_ReadPin(DHT11_GPIO_PORT, DHT11_GPIO_PIN) == GPIO_PIN_RESET) {
        data[i / 8] <<= 1;
      } else {
        data[i / 8] <<= 1;
        data[i / 8] |= 0x01;
      }
      while (HAL_GPIO_ReadPin(DHT11_GPIO_PORT, DHT11_GPIO_PIN));
    }
    /* 检查校验和 */
    checksum = data[0] + data[1] + data[2] + data[3];
    if (data[4] == checksum) {
      DHT11.Humidity = data[0];
      DHT11.Temperature = data[2];
      return HAL_OK;
    }
  }
  return HAL_ERROR;
}

/* DHT11初始化 */
void DHT11_Init(void)
{
  /* 初始化DHT11引脚 */
  DHT11_GPIO_Init();
  
  /* 初始化DHT11句柄 */
  DHT11.Status = DHT11_IDLE;
  DHT11.Humidity = 0;
  DHT11.Temperature = 0;
}

/* 读取DHT11数据 */
HAL_StatusTypeDef DHT11_Read(DHT11_HandleTypeDef *hdht11)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t timeout = 0;

  /* 检查状态 */
  if (hdht11->Status == DHT11_IDLE) {
    /* 标记为就绪状态 */
    hdht11->Status = DHT11_READY;
    /* 发送读取命令 */
    status = DHT11_ReadData();
    /* 延时等待下一次读取 */
    HAL_Delay(2000);
    /* 标记为闲置状态 */
    hdht11->Status = DHT11_IDLE;
  } else {
    status = HAL_BUSY;
  }

  return status;
}

使用示例：

#include "main.h"
#include "dht11.h"

int main(void)
{
  HAL_Init();
  SystemClock_Config();

  DHT11_Init();

  while (1) {
    if (DHT11_Read(&DHT11) == HAL_OK) {
      printf("Humidity: %d%%, Temperature: %dC\r\n", DHT11.Humidity, DHT11.Temperature);
    } else {
      printf("Error reading DHT11 data!\r\n");
    }
    HAL_Delay(1000);
  }
}