USB VCP Unknown Device

[maxyork145]

Posted on July 03, 2013 at 17:42

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 ------------------------------------------------------------------*/

&sharpinclude ''usbd_cdc_core.h''

&sharpinclude ''usbd_usr.h'' &sharpinclude ''usb_conf.h'' &sharpinclude ''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

  * @{   */   &sharpifdef USB_OTG_HS_INTERNAL_DMA_ENABLED   &sharpif defined ( __ICCARM__ ) /*!< IAR Compiler */     &sharppragma data_alignment=4     &sharpendif &sharpendif /* 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, &sharpifdef USE_USB_OTG_HS             USB_OTG_HS_CORE_ID, &sharpelse                        USB_OTG_FS_CORE_ID, &sharpendif              &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;     }   } }

&sharpifdef 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)   {} } &sharpendif

/**

  * @}   */

/**

  * @}   */

/**

  * @}   */

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

#usb-vcp

[Tesla DeLorean]

Posted on July 03, 2013 at 18:06

What version of Windows? What version of the Driver?

[maxyork145]

Posted on July 09, 2013 at 17:13

hello

you need to see the system_stm32f4xx.c if you dont yous the good clock, the pc cant know the device usb this is is the configuration used with discovery Stm32f4 *=============================================================================   *=============================================================================   *        Supported STM32F4xx device revision    | Rev A   *-----------------------------------------------------------------------------   *        System Clock source                    | PLL (HSE)   *-----------------------------------------------------------------------------   *        SYSCLK(Hz)                             | 168000000   *-----------------------------------------------------------------------------   *        HCLK(Hz)                               | 168000000   *-----------------------------------------------------------------------------   *        AHB Prescaler                          | 1   *-----------------------------------------------------------------------------   *        APB1 Prescaler                         | 4   *-----------------------------------------------------------------------------   *        APB2 Prescaler                         | 2   *-----------------------------------------------------------------------------   *        HSE Frequency(Hz)                      | 8000000   *-----------------------------------------------------------------------------   *        PLL_M                                  | 8   *-----------------------------------------------------------------------------   *        PLL_N                                  | 336   *-----------------------------------------------------------------------------   *        PLL_P                                  | 2   *-----------------------------------------------------------------------------   *        PLL_Q                                  | 7   *-----------------------------------------------------------------------------   *        PLLI2S_N                               | NA   *-----------------------------------------------------------------------------   *        PLLI2S_R                               | NA   *-----------------------------------------------------------------------------   *        I2S input clock                        | NA   *-----------------------------------------------------------------------------   *        VDD(V)                                 | 3.3   *-----------------------------------------------------------------------------   *        High Performance mode                  | Enabled   *-----------------------------------------------------------------------------   *        Flash Latency(WS)                      | 5   *-----------------------------------------------------------------------------   *        Prefetch Buffer                        | OFF   *-----------------------------------------------------------------------------   *        Instruction cache                      | ON   *-----------------------------------------------------------------------------   *        Data cache                             | ON   *-----------------------------------------------------------------------------   *        Require 48MHz for USB OTG FS,          | Enabled   *        SDIO and RNG clock                     |

[Tesla DeLorean]

Posted on July 09, 2013 at 17:23

You need an accurate/crystal based clock source to meet USB specs, the RC based HSI won't get you there.

CAN also requires an accurate clock. Were you using the wrong clock settings?