为啥 USB CDC 在接收数据时会挂起？

Posted 2023-02-19

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【中文标题】为啥 USB CDC 在接收数据时会挂起？【英文标题】：Why does USB CDC hang while receiving data?为什么 USB CDC 在接收数据时会挂起？ 【发布时间】：2021-05-14 21:36:44 【问题描述】：

下午好，我在 USB (CDC) com 端口上使用 stm32 Blue Pill，“IAR”开发环境。我已经为 stm32 连接了一个库 1、2 以使用 W25Qxx SPI 闪存驱动器...

我在 main.c 文件中运行测试如下：写字节，读字节，写页，读页，扇区写入，扇区读取，块写入，块读取。所有检查均成功，闪存驱动器正常工作，库没有问题。

问题如下，当我通过应用程序或终端连接到端口并尝试发送数据时以“HEX”格式1E 01 0A 02 00 00 09 C4 03，然后通过微控制器（W25Qxx）将它们写入内存，然后USB CDC在stm32上接收数据包和重新连接时冻结（崩溃）计算机上出现“USB 设备无法识别”消息。

3.3v电源没有关闭！

为了方便大家检查，我举个例子：

该项目是通过 STM32CubeMX 创建的。

Main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usb_device.h"
#include "usbd_cdc_if.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "string.h" // это для функции strlen()
#include "stdio.h"
#include "w25qxx.h"

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
ADC_HandleTypeDef hadc2;
DMA_HandleTypeDef hdma_adc1;
SPI_HandleTypeDef hspi2;
UART_HandleTypeDef huart1;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_ADC1_Init(void);
static void MX_ADC2_Init(void);
static void MX_SPI2_Init(void);
static void MX_USART1_UART_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USB_DEVICE_Init();
  MX_ADC1_Init();
  MX_ADC2_Init();
  MX_SPI2_Init();
  MX_USART1_UART_Init();
  W25qxx_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
while (1)
  
    
  
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

  /* USER CODE END 3 */


/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)

  RCC_OscInitTypeDef RCC_OscInitStruct = 0;
  RCC_ClkInitTypeDef RCC_ClkInitStruct = 0;
  RCC_PeriphCLKInitTypeDef PeriphClkInit = 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();
  
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC|RCC_PERIPHCLK_USB;
  PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV1_5;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  
    Error_Handler();
  


/**
  * @brief ADC1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_ADC1_Init(void)


  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_MultiModeTypeDef multimode = 0;
  ADC_ChannelConfTypeDef sConfig = 0;

  /* USER CODE BEGIN ADC1_Init 1 */

  /* USER CODE END ADC1_Init 1 */
  /** Common config
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  
    Error_Handler();
  
  /** Configure the ADC multi-mode
  */
  multimode.Mode = ADC_DUALMODE_REGSIMULT;
  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
  
    Error_Handler();
  
  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  
    Error_Handler();
  
  /* USER CODE BEGIN ADC1_Init 2 */

  /* USER CODE END ADC1_Init 2 */



/**
  * @brief ADC2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_ADC2_Init(void)


  /* USER CODE BEGIN ADC2_Init 0 */

  /* USER CODE END ADC2_Init 0 */

  ADC_ChannelConfTypeDef sConfig = 0;

  /* USER CODE BEGIN ADC2_Init 1 */

  /* USER CODE END ADC2_Init 1 */
  /** Common config
  */
  hadc2.Instance = ADC2;
  hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc2.Init.ContinuousConvMode = ENABLE;
  hadc2.Init.DiscontinuousConvMode = DISABLE;
  hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc2.Init.NbrOfConversion = 1;
  if (HAL_ADC_Init(&hadc2) != HAL_OK)
  
    Error_Handler();
  
  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
  if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
  
    Error_Handler();
  
  /* USER CODE BEGIN ADC2_Init 2 */

  /* USER CODE END ADC2_Init 2 */



/**
  * @brief SPI2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_SPI2_Init(void)


  /* USER CODE BEGIN SPI2_Init 0 */

  /* USER CODE END SPI2_Init 0 */

  /* USER CODE BEGIN SPI2_Init 1 */

  /* USER CODE END SPI2_Init 1 */
  /* SPI2 parameter configuration*/
  hspi2.Instance = SPI2;
  hspi2.Init.Mode = SPI_MODE_MASTER;
  hspi2.Init.Direction = SPI_DIRECTION_2LINES;
  hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi2.Init.NSS = SPI_NSS_SOFT;
  hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
  hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi2.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi2) != HAL_OK)
  
    Error_Handler();
  
  /* USER CODE BEGIN SPI2_Init 2 */

  /* USER CODE END SPI2_Init 2 */



/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART1_UART_Init(void)


  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  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();
  
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */



/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)


  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);



/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)

  GPIO_InitTypeDef GPIO_InitStruct = 0;

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

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(FLASH_CS_GPIO_Port, FLASH_CS_Pin, GPIO_PIN_SET);

  /*Configure GPIO pin : LED_Pin */
  GPIO_InitStruct.Pin = LED_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : FLASH_CS_Pin */
  GPIO_InitStruct.Pin = FLASH_CS_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(FLASH_CS_GPIO_Port, &GPIO_InitStruct);



/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)

  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */

  /* USER CODE END Error_Handler_Debug */


#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)

  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */

#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

添加到 usbd_cdc_if.c 文件：

/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_if.h"
#include "w25qxx.h"

static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)

  /* USER CODE BEGIN 6 */
   if(Buf !=NULL)
     
      //Identifier
     if(Buf[0] == 30)
      
    W25qxx_EraseSector(0); // 4096 byte
  //W25qxx_WritePage (Buf,0,0,9);
    W25qxx_WriteByte(Buf[1], 0); //checkbox 0-1
    W25qxx_WriteByte(Buf[2], 1); //button_min 0-60
    W25qxx_WriteByte(Buf[3], 2); //radioButton 2-3
    W25qxx_WriteByte(Buf[4], 3); //voltage
    W25qxx_WriteByte(Buf[5], 4); //voltage
    W25qxx_WriteByte(Buf[6], 5); //voltage
    W25qxx_WriteByte(Buf[7], 6); //voltage
    W25qxx_WriteByte(Buf[8], 7); //pul 0-199 
   
 
 
    USBD_CDC_ReceivePacket(&hUsbDeviceFS);
    return (USBD_OK);
  /* USER CODE END 6 */

为了验证，发明了一个缓冲区接收测试（成功）没有挂起。

添加到 usbd_cdc_if.c 文件：

uint8_t checkBox;
uint8_t button_min;
uint8_t radioButton;
int voltage;
uint8_t pul;
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)

  /* USER CODE BEGIN 6 */
  if(Buf !=NULL)
      
      //Identifier
      if(Buf[0] == 30)
      
        checkBox = Buf[1];
        button_min = Buf[2];
        radioButton = Buf[3];
        voltage = (Buf[4] << 24) | (Buf[5] << 16) | (Buf[6] << 28) | (Buf[7] << 0);
        pul = Buf[8];
     
  
  
    USBD_CDC_ReceivePacket(&hUsbDeviceFS);
    return (USBD_OK);
  /* USER CODE END 6 */

为了检查，发明了一个带 LED 的测试（成功）。

static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)

  /* USER CODE BEGIN 6 */
  if(Buf !=NULL)
      
      //Identifier
      if(Buf[0] == 30)
      
         if(Buf[1] == 1)
         
       HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
         
        else if (Buf[1] == 0)
        
       HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
        
     
  
    USBD_CDC_ReceivePacket(&hUsbDeviceFS);
    return (USBD_OK);
  /* USER CODE END 6 */

【问题讨论】：

能否请您发送整个 main.c 文件，包括 while 循环和 USB 函数的调用？补充，我觉得问题出在usbd_cdc_if.c的接收上 【参考方案1】：

据我所知，函数“CDC_Receive_FS()”是来自 USB 中断的回调。所以直接从IRQ写内存是不好的，会阻塞其他中断。

更好的解决方案是将接收缓冲区复制到本地结构并设置一个标志。在您的主循环中，您可以监视标志并开始写入。

【讨论】：

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