写一个stm32f103rct6使用dht11的代码

以下是使用STM32F103RCT6微控制器和DHT11传感器的示例代码。代码使用HAL库和TIM定时器来读取DHT11传感器的数据。

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

TIM_HandleTypeDef htim2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_TIM2_Init();

  HAL_TIM_Base_Start(&htim2);

  DHT11_Init();

  while (1)
  {
    if (DHT11_Read() == DHT11_OK)
    {
      printf("Temperature: %d.%d C\n", DHT11_Data[0], DHT11_Data[1]);
      printf("Humidity: %d.%d %%\n", DHT11_Data[2], DHT11_Data[3]);
    }
    else
    {
      printf("Error reading DHT11\n");
    }

    HAL_Delay(1000);
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_TIM2_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig;
  TIM_MasterConfigTypeDef sMasterConfig;

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 72-1;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 0xFFFF;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  __HAL_RCC_GPIOA_CLK_ENABLE();

  GPIO_InitStruct.Pin = GPIO_PIN_0;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

DHT11.h文件

#ifndef DHT11_H_
#define DHT11_H_

#include "main.h"

#define DHT11_OK      0
#define DHT11_ERROR   1

extern uint8_t DHT11_Data[5];

void DHT11_Init(void);
uint8_t DHT11_Read(void);

#endif /* DHT11_H_ */

DHT11.c文件

#include "dht11.h"

#define DHT11_PIN    GPIO_PIN_0
#define DHT11_PORT   GPIOA

uint8_t DHT11_Data[5] = {0};

void DHT11_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  GPIO_InitStruct.Pin = DHT11_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(DHT11_PORT, &GPIO_InitStruct);

  HAL_GPIO_WritePin(DHT11_PORT, DHT11_PIN, GPIO_PIN_SET);
  HAL_Delay(1000);
}

uint8_t DHT11_Read(void)
{
  uint8_t check = 0;
  uint8_t data = 0;
  uint8_t i;

  GPIO_InitTypeDef GPIO_InitStruct;

  GPIO_InitStruct.Pin = DHT11_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(DHT11_PORT, &GPIO_InitStruct);

  HAL_GPIO_WritePin(DHT11_PORT, DHT11_PIN, GPIO_PIN_RESET);
  HAL_Delay(18);

  HAL_GPIO_WritePin(DHT11_PORT, DHT11_PIN, GPIO_PIN_SET);
  HAL_Delay(40);

  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  HAL_GPIO_Init(DHT11_PORT, &GPIO_InitStruct);

  while (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN) == GPIO_PIN_RESET);

  while (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN) == GPIO_PIN_SET);

  for (i = 0; i < 40; i++)
  {
    while (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN) == GPIO_PIN_RESET);

    TIM2->CNT = 0;
    while (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN) == GPIO_PIN_SET);
    uint32_t t = TIM2->CNT;

    if (t > 40)
    {
      data |= (1 << (7 - i%8));
    }

    if (i % 8 == 7)
    {
      DHT11_Data[i/8] = data;
      data = 0;
    }
  }

  check = DHT11_Data[0] + DHT11_Data[1] + DHT11_Data[2] + DHT11_Data[3];

  if (check != DHT11_Data[4])
  {
    return DHT11_ERROR;
  }

  return DHT11_OK;
}

代码中的DHT11_Init函数用于初始化DHT11传感器，DHT11_Read函数用于读取传感器数据。该代码使用TIM2定时器来计算传感器数据位的时间，因此需要使用MX_TIM2_Init函数来初始化该定时器。DHT11_Read函数将读取的数据存储在DHT11_Data数组中。