两个stm32f103c8t6从机读取ds18b20的温度并将温度信息传输给I2C总线利用库函数编码

以下是两个STM32F103C8T6从机读取DS18B20温度并将温度信息通过I2C总线传输的代码，其中一个从机作为传感器节点，另一个从机作为I2C总线主控节点：

传感器节点代码：

#include "main.h"
#include "stm32f1xx_hal.h"
#include "ds18b20.h"
#include "i2c.h"

/* DS18B20引脚定义 */
#define DS18B20_GPIO_PORT GPIOA
#define DS18B20_GPIO_PIN GPIO_PIN_1

/* I2C设备地址 */
#define I2C_DEVICE_ADDRESS 0x50

/* 定义I2C发送和接收缓冲区 */
uint8_t txBuffer[2];
uint8_t rxBuffer[2];

void SystemClock_Config(void);

int main(void)
{
  /* MCU初始化 */
  HAL_Init();
  SystemClock_Config();

  /* I2C初始化 */
  MX_I2C1_Init();

  /* DS18B20初始化 */
  ds18b20_init(DS18B20_GPIO_PORT, DS18B20_GPIO_PIN);

  while (1)
  {
    float temperature = ds18b20_get_temperature(DS18B20_GPIO_PORT, DS18B20_GPIO_PIN);

    /* 将温度转换为两个字节的数据 */
    uint16_t tempData = (uint16_t)(temperature * 10);
    txBuffer[0] = tempData >> 8;
    txBuffer[1] = tempData & 0xFF;

    /* 发送温度数据到I2C */
    HAL_I2C_Slave_Transmit(&hi2c1, txBuffer, 2, HAL_MAX_DELAY);

    /* 等待I2C传输完成 */
    HAL_Delay(1000);
  }
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_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();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  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();
  }
}

I2C总线主控节点代码：

#include "main.h"
#include "stm32f1xx_hal.h"
#include "i2c.h"

/* I2C设备地址 */
#define I2C_DEVICE_ADDRESS 0x50

/* 定义I2C发送和接收缓冲区 */
uint8_t txBuffer[2];
uint8_t rxBuffer[2];

void SystemClock_Config(void);

int main(void)
{
  /* MCU初始化 */
  HAL_Init();
  SystemClock_Config();

  /* I2C初始化 */
  MX_I2C1_Init();

  while (1)
  {
    /* 接收从机发送的温度数据 */
    HAL_I2C_Master_Receive(&hi2c1, I2C_DEVICE_ADDRESS, rxBuffer, 2, HAL_MAX_DELAY);

    /* 将温度数据转换为浮点数 */
    uint16_t tempData = (rxBuffer[0] << 8) | rxBuffer[1];
    float temperature = ((float)tempData) / 10;

    /* 输出温度 */
    printf("Temperature: %.1f°C\r\n", temperature);

    /* 等待一段时间 */
    HAL_Delay(1000);
  }
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_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();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  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();
  }
}

需要注意的是，在I2C总线主控节点中，需要使用UART或其他方式输出温度信息。另外，需要在CubeMX中配置I2C的GPIO引脚和时钟，并生成代码。