主機環境：Windows 7 SP1

開發環境：MDK5.14

目標板：STM32F103C8T6

開發庫：STM32F1Cube庫和STM32_USB_Device_Library

STM32Cube庫中提供了一些有關USB的例程，在其工程目錄下的Applications目錄中，這里打開STM3210E_EVAL目錄，可以看到如下例程：

這里選取一個簡單的例子CDC_Standalone，為一個USB通信例程，具體實現是一個USB轉串口的功能，相當于USB串口線。把示例里面的inc和src目錄下的文件拷貝到新建工程中，這里是把跟usb通信相關的文件放到了vcp目錄下。文件目錄結構如下：

其中BSP目錄很簡單，由于所購買的單板只用到了USB，UART模塊以及一個LED燈，原理圖如下：

其中PA15引腳連接了一個LED燈，如下：

因此在stm32f103_demo文件中只添加了led的操作，源文件如下：

/**
  ******************************************************************************
  * @file    stm32f103_demo.c
  * @author  MCD Application Team
  * @version V6.0.0
  * @date    13-October-2015
  * @brief   This file provides a set of firmware functions to manage Leds, 
  *          for STM32F103_DEMO
  ******************************************************************************
  * @attention
  *
  * 
© COPYRIGHT(c) 2014 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */
  
/* Includes ------------------------------------------------------------------*/
#include "STM32f103_demo.h"
 
/** @addtogroup BSP
  * @{
  */ 
 
/** @defgroup STM32F103_DEMO STM32F103-DEMO
  * @{
  */ 
 
/** @defgroup STM32F103_DEMO_Common STM32F103-DEMO Common
  * @{
  */ 
 
/** @defgroup STM32F103_DEMO_Private_TypesDefinitions Private Types Definitions
  * @{
  */ 
 
/**
  * @}
  */ 
 
/** @defgroup STM32F103_DEMO_Private_Defines Private Defines
  * @{
  */ 
 
/**
 * @brief STM32103 EVAL BSP Driver version number V6.0.0
   */
#define __STM32F103_DEMO_BSP_VERSION_MAIN       (0x06) /*!< [31:24] main version */
#define __STM32F103_DEMO_BSP_VERSION_SUB1       (0x00) /*!< [23:16] sub1 version */
#define __STM32F103_DEMO_BSP_VERSION_SUB2       (0x00) /*!< [15:8]  sub2 version */
#define __STM32F103_DEMO_BSP_VERSION_RC         (0x00) /*!< [7:0]  release candidate */
#define __STM32F103_DEMO_BSP_VERSION            ((__STM32F103_DEMO_BSP_VERSION_MAIN << 24)
                                               |(__STM32F103_DEMO_BSP_VERSION_SUB1 << 16)
                                               |(__STM32F103_DEMO_BSP_VERSION_SUB2 << 8 )
                                               |(__STM32F103_DEMO_BSP_VERSION_RC))
 
/**
  * @}
  */
 
 
/** @defgroup STM32F103_DEMO_Private_Variables Private Variables
  * @{
  */ 
/**
 * @brief LED variables
 */
GPIO_TypeDef* LED_PORT[LEDn] = {LED_GPIO_PORT};
 
const uint16_t LED_PINS[LEDn] = {LED_PIN};
 
/**
  * @brief  This method returns the STM32103 EVAL BSP Driver revision
  * @retval version : 0xXYZR (8bits for each decimal, R for RC)
  */
uint32_t BSP_GetVersion(void)
{
  	return __STM32F103_DEMO_BSP_VERSION;
}
 
/**
  * @brief  Configures LED GPIO.
  * @param  Led: Specifies the Led to be configured. 
  *   This parameter can be one of following parameters:
  *     @arg LED
  * @retval None
  */
void BSP_LED_Init(Led_TypeDef Led)
{
	GPIO_InitTypeDef  gpioinitstruct = {0};
 
	/* Enable the GPIO_LED clock */
	LED_GPIO_CLK_ENABLE();
	__HAL_RCC_AFIO_CLK_ENABLE();
	__HAL_AFIO_REMAP_SWJ_DISABLE();
 
	/* Configure the GPIO_LED pin */
	gpioinitstruct.Pin    = LED_PINS[Led];
	gpioinitstruct.Mode   = GPIO_MODE_OUTPUT_PP;
	gpioinitstruct.Pull   = GPIO_NOPULL;
	gpioinitstruct.Speed  = GPIO_SPEED_HIGH;
 
	HAL_GPIO_Init(LED_PORT[Led], &gpioinitstruct);
 
	HAL_GPIO_WritePin(LED_PORT[Led], LED_PINS[Led], GPIO_PIN_RESET);
}
 
/**
  * @brief  Turns selected LED On.
  * @param  Led: Specifies the Led to be set on. 
  *   This parameter can be one of following parameters:
  *     @arg LED
  * @retval None
  */
void BSP_LED_On(Led_TypeDef Led)
{
  	HAL_GPIO_WritePin(LED_PORT[Led], LED_PINS[Led], GPIO_PIN_RESET);
}
 
/**
  * @brief  Turns selected LED Off.
  * @param  Led: Specifies the Led to be set off. 
  *   This parameter can be one of following parameters:
  *     @arg LED
  * @retval None
  */
void BSP_LED_Off(Led_TypeDef Led)
{
  	HAL_GPIO_WritePin(LED_PORT[Led], LED_PINS[Led], GPIO_PIN_SET);
}
 
/**
  * @brief  Toggles the selected LED.
  * @param  Led: Specifies the Led to be toggled. 
  *   This parameter can be one of following parameters:
  *     @arg LED
  * @retval None
  */
void BSP_LED_Toggle(Led_TypeDef Led)
{
  	HAL_GPIO_TogglePin(LED_PORT[Led], LED_PINS[Led]);
}
 
/**
  * @}
  */    
  
/**
  * @}
  */    
  
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 

頭文件如下：

/**
  ******************************************************************************
  * @file    stm32f103_demo.h
  * @author  MCD Application Team
  * @version V6.0.0
  * @date    13-October-2015
  * @brief   This file contains definitions for STM32F103_DEMO's LEDs, 
  *          hardware resources.
  ******************************************************************************
  * @attention
  *
  * 
© COPYRIGHT(c) 2014 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */
 
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __STM32F103_DEMO_H
#define __STM32F103_DEMO_H
 
#ifdef __cplusplus