OTG_FS 控制和状态寄存器 (OTG_FS_GOTGCTL)
HAL_StatusTypeDef USB_HostInit (USB_OTG_GlobalTypeDef *USBx, USB_OTG_CfgTypeDef cfg)
{
  uint32_t i;

  /* Restart the Phy Clock */
  USBx_PCGCCTL = 0U;

  /* Activate VBUS Sensing B */
#if defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx) ||
    defined(STM32F412Rx) || defined(STM32F412Cx)
  USBx->GCCFG |= USB_OTG_GCCFG_VBDEN;
#else
  USBx->GCCFG &=~ (USB_OTG_GCCFG_VBUSASEN);
  USBx->GCCFG &=~ (USB_OTG_GCCFG_VBUSBSEN);
  USBx->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;//执行粮这一条 USBx->GOTGCTL  BSVLD 和ASVLD就置一了，为什么？
//  USBx->GOTGCTL
#endif /* STM32F446xx || STM32F469xx || STM32F479xx || STM32F412Zx || STM32F412Rx || STM32F412Vx || STM32F412Cx */
USBx->GOTGCTL|=USB_OTG_GOTGCTL_DBCT;  //自己加的，不起作用
  /* Disable the FS/LS support mode only */
  if((cfg.speed == USB_OTG_SPEED_FULL)&&
     (USBx != USB_OTG_FS))
  {
    USBx_HOST->HCFG |= USB_OTG_HCFG_FSLSS;
  }
  else
  {
    USBx_HOST->HCFG &= ~(USB_OTG_HCFG_FSLSS);  
  }

  /* Make sure the FIFOs are flushed. */
  USB_FlushTxFifo(USBx, 0x10U); /* all Tx FIFOs */
  USB_FlushRxFifo(USBx);

  /* Clear all pending HC Interrupts */
  for (i = 0U; i < cfg.Host_channels; i++)
  {
    USBx_HC(i)->HCINT = 0xFFFFFFFFU;
    USBx_HC(i)->HCINTMSK = 0U;
  }

  /* Enable VBUS driving */
  USB_DriveVbus(USBx, 1U);

  HAL_Delay(200U);

  /* Disable all interrupts. */
  USBx->GINTMSK = 0U;

  /* Clear any pending interrupts */
  USBx->GINTSTS = 0xFFFFFFFFU;

  if(USBx == USB_OTG_FS)
  {
    /* set Rx FIFO size */
    USBx->GRXFSIZ  = (uint32_t )0x80U;
    USBx->DIEPTXF0_HNPTXFSIZ = (uint32_t )(((0x60U << 16U)& USB_OTG_NPTXFD) | 0x80U);
    USBx->HPTXFSIZ = (uint32_t )(((0x40U << 16U)& USB_OTG_HPTXFSIZ_PTXFD) | 0xE0U);
  }
  else
  {
    /* set Rx FIFO size */
    USBx->GRXFSIZ  = (uint32_t )0x200U;
    USBx->DIEPTXF0_HNPTXFSIZ = (uint32_t )(((0x100U << 16U)& USB_OTG_NPTXFD) | 0x200U);
    USBx->HPTXFSIZ = (uint32_t )(((0xE0U << 16U)& USB_OTG_HPTXFSIZ_PTXFD) | 0x300U);
  }

  /* Enable the common interrupts */
  if (cfg.dma_enable == DISABLE)
  {
    USBx->GINTMSK |= USB_OTG_GINTMSK_RXFLVLM;
  }

  /* Enable interrupts matching to the Host mode ONLY */
  USBx->GINTMSK |= (USB_OTG_GINTMSK_PRTIM            | USB_OTG_GINTMSK_HCIM |
                    USB_OTG_GINTMSK_SOFM             |USB_OTG_GINTSTS_DISCINT|
                    USB_OTG_GINTMSK_PXFRM_IISOOXFRM  | USB_OTG_GINTMSK_WUIM);

  return HAL_OK;
}