USB 读写U盘

只看该作者 · 2013-5-14 16:23

void USBH_USR_DeviceSpeedDetected(uint8_t DeviceSpeed)
{
  if(DeviceSpeed == HPRT0_PRTSPD_HIGH_SPEED)
  {
LCD_UsrLog((void *)MSG_DEV_HIGHSPEED);
  }
  else if(DeviceSpeed == HPRT0_PRTSPD_FULL_SPEED)
  {
LCD_UsrLog((void *)MSG_DEV_FULLSPEED);
  }
  else if(DeviceSpeed == HPRT0_PRTSPD_LOW_SPEED)
  {
LCD_UsrLog((void *)MSG_DEV_LOWSPEED);
  }
  else
  {
LCD_UsrLog((void *)MSG_DEV_ERROR);
  }
}
插上U盘，我总是在低速那里运行，枚举不应该是全速吗？这是为什么，现在枚举不成功，我用的最新的ST库。