STM32F407-ZLP

接收主机状态0包ZLP

USBD_Status  USBD_CtlReceiveStatus (USB_OTG_CORE_HANDLE  *pdev)
{
  USBD_Status ret = USBD_OK;
  pdev->dev.device_state = USB_OTG_EP0_STATUS_OUT;  
  DCD_EP_PrepareRx ( pdev,
                    0,
                    NULL,
                    0);  

  USB_OTG_EP0_OutStart(pdev);

  return ret;
}

发送状态0包给主机

/**
* @brief  USBD_CtlSendStatus
*         send zero lzngth packet on the ctl pipe
* @param  pdev: USB OTG device instance
* @retval status
*/
USBD_Status  USBD_CtlSendStatus (USB_OTG_CORE_HANDLE  *pdev)
{
  USBD_Status ret = USBD_OK;
  pdev->dev.device_state = USB_OTG_EP0_STATUS_IN;
  DCD_EP_Tx (pdev,
             0,
             NULL, 
             0); 

  USB_OTG_EP0_OutStart(pdev);  

  return ret;
}