写一个stm32f103的串口发送ds18b20数据的代码

以下是一个基于STM32F103的串口发送DS18B20数据的示例代码。该代码使用了HAL库进行编写，并假定DS18B20连接到PB12引脚。

#include "stm32f1xx_hal.h"
#include <stdio.h>

#define DS18B20_PORT GPIOB
#define DS18B20_PIN GPIO_PIN_12

UART_HandleTypeDef huart1;

void SystemClock_Config(void);
void Error_Handler(void);

void MX_GPIO_Init(void);
void MX_USART1_UART_Init(void);

void ds18b20_start();
void ds18b20_write(uint8_t data);
uint8_t ds18b20_read();
float ds18b20_read_temperature();

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_USART1_UART_Init();

  float temperature;

  while (1)
  {
    temperature = ds18b20_read_temperature();
    char buf[10];
    sprintf(buf, "%.2f", temperature);
    HAL_UART_Transmit(&huart1, (uint8_t*)buf, strlen(buf), HAL_MAX_DELAY);
    HAL_Delay(1000);
  }
}

void ds18b20_start()
{
  HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
  HAL_Delay(480);

  HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
  HAL_Delay(60);

  HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
  HAL_Delay(60);
}

void ds18b20_write(uint8_t data)
{
  for (int i = 0; i < 8; i++)
  {
    if ((data & (1 << i)) != 0)
    {
      HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
      HAL_Delay(2);
      HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
      HAL_Delay(60);
    }
    else
    {
      HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
      HAL_Delay(60);
      HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
      HAL_Delay(2);
    }
  }
}

uint8_t ds18b20_read()
{
  uint8_t data = 0;
  for (int i = 0; i < 8; i++)
  {
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
    HAL_Delay(2);
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
    HAL_Delay(10);
    if (HAL_GPIO_ReadPin(DS18B20_PORT, DS18B20_PIN) == GPIO_PIN_SET)
    {
      data |= 1 << i;
    }
    HAL_Delay(50);
  }
  return data;
}

float ds18b20_read_temperature()
{
  ds18b20_start();
  ds18b20_write(0xCC);
  ds18b20_write(0x44); // Start temperature conversion
  HAL_Delay(750);

  ds18b20_start();
  ds18b20_write(0xCC);
  ds18b20_write(0xBE); // Read scratchpad

  uint8_t data[9];
  for (int i = 0; i < 9; i++)
  {
    data[i] = ds18b20_read();
  }

  int16_t temp = (data[1] << 8) | data[0];
  float temperature = temp * 0.0625;

  return temperature;
}

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.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  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();
  }
}

void Error_Handler(void)
{
  while (1);
}

void MX_USART1_UART_Init(void)
{
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
}

void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_USART1_CLK_ENABLE();

  GPIO_InitStruct.Pin = GPIO_PIN_12;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = GPIO_PIN_9 | GPIO_PIN_10;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

该代码中的ds18b20_start、ds18b20_write和ds18b20_read函数分别用于启动DS18B20、写入数据和读取数据。ds18b20_read_temperature函数用于读取温度值。主函数中的代码用于将温度值转换为字符串并通过串口发送。请注意，此代码仅供参考，您需要根据自己的需求进行修改和优化。