使用stm32读取两个传感器的数据。传感器1：首先通过UART1发送FF 01 03 02 00 00 00 00 FB关闭主动上报,发送：FF 01 03 03 02 00 00 00 F8，向传感器问询，传感器返回:XXX+%(ASCII码，数值+单位%),把返回的数值以float类型，保留四位小数保存。传感器2：通过UART2发送：11 01 01 ED读取O2 测量结果，返回结果为：16 09 01 DF1 DF2 DF3 DF4 DF5 DF6 DF7 DF8 [CS]，数据处理方法为：O2 浓度值= （DF1*256 + DF2）/10 （Vol %），O2 流量值= （DF3*256 + DF4）/10 （L/min），O2 温度值= （DF5*256 + DF6）/10 （℃）。帮我写—段使用标准库函数读取这2个传感器数值的代码，请使用标准库函数

以下是使用标准库函数读取两个传感器数据的代码：

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

UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_USART2_UART_Init(void);

int main(void)
{
  float sensor1_value = 0.0;
  float sensor2_o2_concentration = 0.0;
  float sensor2_o2_flow_rate = 0.0;
  float sensor2_o2_temperature = 0.0;
  
  uint8_t sensor1_rx_buffer[20]; // 接收缓冲区
  uint8_t sensor2_rx_buffer[20]; // 接收缓冲区
  
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();
  
  while (1)
  {
    // 读取传感器1的数据
    // 发送关闭主动上报指令
    uint8_t sensor1_cmd1[] = {0xFF, 0x01, 0x03, 0x02, 0x00, 0x00, 0x00, 0x00, 0xFB};
    HAL_UART_Transmit(&huart1, sensor1_cmd1, sizeof(sensor1_cmd1), 100);
    HAL_Delay(10);
    
    // 发送询问指令
    uint8_t sensor1_cmd2[] = {0xFF, 0x01, 0x03, 0x03, 0x02, 0x00, 0x00, 0x00, 0xF8};
    HAL_UART_Transmit(&huart1, sensor1_cmd2, sizeof(sensor1_cmd2), 100);
    
    // 接收传感器1的返回值
    HAL_UART_Receive(&huart1, sensor1_rx_buffer, sizeof(sensor1_rx_buffer), 1000);
    
    // 解析传感器1的返回值
    char* sensor1_value_str = strstr((const char*)sensor1_rx_buffer, "%");
    if (sensor1_value_str != NULL)
    {
      sscanf(sensor1_value_str - 7, "%f", &sensor1_value);
    }
    
    // 读取传感器2的数据
    uint8_t sensor2_cmd[] = {0x11, 0x01, 0x01, 0xED};
    HAL_UART_Transmit(&huart2, sensor2_cmd, sizeof(sensor2_cmd), 100);
    
    // 接收传感器2的返回值
    HAL_UART_Receive(&huart2, sensor2_rx_buffer, sizeof(sensor2_rx_buffer), 1000);
    
    // 解析传感器2的返回值
    if (sensor2_rx_buffer[0] == 0x16 && sensor2_rx_buffer[1] == 0x09 && sensor2_rx_buffer[2] == 0x01)
    {
      uint16_t o2_concentration_raw = (sensor2_rx_buffer[3] << 8) | sensor2_rx_buffer[4];
      uint16_t o2_flow_rate_raw = (sensor2_rx_buffer[5] << 8) | sensor2_rx_buffer[6];
      uint16_t o2_temperature_raw = (sensor2_rx_buffer[7] << 8) | sensor2_rx_buffer[8];
      
      sensor2_o2_concentration = o2_concentration_raw / 10.0f;
      sensor2_o2_flow_rate = o2_flow_rate_raw / 10.0f;
      sensor2_o2_temperature = o2_temperature_raw / 10.0f;
    }
    
    // 打印传感器数据
    printf("Sensor1 value: %f\n", sensor1_value);
    printf("Sensor2 O2 concentration: %f Vol %%\n", sensor2_o2_concentration);
    printf("Sensor2 O2 flow rate: %f L/min\n", sensor2_o2_flow_rate);
    printf("Sensor2 O2 temperature: %f C\n", sensor2_o2_temperature);
    
    HAL_Delay(1000);
  }
}

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();
  }
}

static void MX_USART1_UART_Init(void)
{
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 9600;
  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();
  }
}

static void MX_USART2_UART_Init(void)
{
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 9600;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1, GPIO_PIN_RESET);

  /*Configure GPIO pin : PA1 */
  GPIO_InitStruct.Pin = GPIO_PIN_1;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

需要注意的是，这段代码中的串口配置和引脚配置是针对 STM32F103C8T6 开发板的，如果你使用的是其他型号的 STM32 开发板，需要进行相应的修改。