USB Example的硬體設定

USB裝置插入時，HOST端利用D+與D-判斷裝置插入，當D+有上拉電阻為高電位判斷為高速或全速裝置，D-有上拉電阻為高電位判斷為低速裝置

Define中有定義一些環境變數如USE_STM3210E_EVAL 

  

如使用GPIO控制上拉電阻，必須依照硬體配置修改

檔案"platform_config.h"

/* Define the STM32F10x hardware depending on the used evaluation board */

#ifdef USE_STM3210B_EVAL

  #define USB_DISCONNECT                      GPIOD  

  #define USB_DISCONNECT_PIN                  GPIO_Pin_9

  #define RCC_APB2Periph_GPIO_DISCONNECT      RCC_APB2Periph_GPIOD

  #define EVAL_COM1_IRQn                      USART1_IRQn

#elif defined (USE_STM3210E_EVAL)

  #define USB_DISCONNECT                      GPIOB  

  #define USB_DISCONNECT_PIN                  GPIO_Pin_14

  #define RCC_APB2Periph_GPIO_DISCONNECT      RCC_APB2Periph_GPIOB

  #define EVAL_COM1_IRQn                      USART1_IRQn

#elif defined (USE_STM3210C_EVAL)

  #define USB_DISCONNECT                      0  

  #define USB_DISCONNECT_PIN                  0

  #define RCC_APB2Periph_GPIO_DISCONNECT      0

  #define EVAL_COM1_IRQn                      USART2_IRQn

#endif /* USE_STM3210B_EVAL */