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USB VCP Unknown Device

Question asked by york.maxim on Jul 3, 2013
Latest reply on Jul 9, 2013 by Clive One
hi everybady
i have started an tutorial for UCB virtual com port (VCP), when the program start, alleways
Unknown device,
can help me

/**
  ******************************************************************************
  * @file    app.c
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    19-March-2012
  * @brief   This file provides all the Application firmware functions.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/

#include "usbd_cdc_core.h"
#include "usbd_usr.h"
#include "usb_conf.h"
#include "usbd_desc.h"

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
  * @{
  */

/** @defgroup APP_VCP
  * @brief Mass storage application module
  * @{
  */

/** @defgroup APP_VCP_Private_TypesDefinitions
  * @{
  */
/**
  * @}
  */

/** @defgroup APP_VCP_Private_Defines
  * @{
  */

/**
  * @}
  */

/** @defgroup APP_VCP_Private_Macros
  * @{
  */
/**
  * @}
  */

/** @defgroup APP_VCP_Private_Variables
  * @{
  */
 
#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
  #if defined ( __ICCARM__ ) /*!< IAR Compiler */
    #pragma data_alignment=4  
  #endif
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
  
__ALIGN_BEGIN USB_OTG_CORE_HANDLE    USB_OTG_dev __ALIGN_END ;

/**
  * @}
  */

/** @defgroup APP_VCP_Private_FunctionPrototypes
  * @{
  */
/**
  * @}
  */

/** @defgroup APP_VCP_Private_Functions
  * @{
  */

/**
  * @brief  Program entry point
  * @param  None
  * @retval None
  */
int main(void)
{
  __IO uint32_t i = 0; 

  /*!< At this stage the microcontroller clock setting is already configured,
  this is done through SystemInit() function which is called from startup
  file (startup_stm32fxxx_xx.s) before to branch to application main.
  To reconfigure the default setting of SystemInit() function, refer to
  system_stm32fxxx.c file
  */ 
 
  USBD_Init(&USB_OTG_dev,
#ifdef USE_USB_OTG_HS
            USB_OTG_HS_CORE_ID,
#else           
            USB_OTG_FS_CORE_ID,
#endif 
            &USR_desc,
            &USBD_CDC_cb,
            &USR_cb);
 
  /* Main loop */
  while (1)
  {
    if (i++ == 0x100000)
    {
      STM_EVAL_LEDToggle(LED1);
      STM_EVAL_LEDToggle(LED2);
      STM_EVAL_LEDToggle(LED3);
      STM_EVAL_LEDToggle(LED4);
      i = 0;
    }
  }
}

#ifdef USE_FULL_ASSERT
/**
* @brief  assert_failed
*         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 can add his own implementation to report the file name and line number,
  ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 
  /* Infinite loop */
  while (1)
  {}
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

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

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