USB 发送问题

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shanzhihun| 中级技术员

楼主 | 2020-11-6 09:42 | 只看该作者回帖奖励

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USB, HID, ST, ev, Report

这是ST的发送
/**
  * @brief  USBD_HID_SendReport
  *       Send HID Report
  * @param  pdev: device instance
  * @param  buff: pointer to report
  * @retval status
  */
uint8_t USBD_HID_SendReport(USBD_HandleTypeDef  *pdev,
                        uint8_t *report,
                        uint16_t len)
{
  USBD_HID_HandleTypeDef    *hhid = (USBD_HID_HandleTypeDef *)pdev->pClassData;

  if (pdev->dev_state == USBD_STATE_CONFIGURED)
  {
if (hhid->state == HID_IDLE)
{
   hhid->state = HID_BUSY;
   USBD_LL_Transmit(pdev,
                     HID_EPIN_ADDR,
                     report,
                     len);
}
  }
  return USBD_OK;
}
我想改成GD的
/*!
\brief    send custom HID report
\param[in]  pudev: pointer to USB device instance
\param[in]  report: pointer to HID report
\param[in]  len: data length
\param[out] none
\retval    USB device operation status
*/
uint8_t  custom_hid_report_send (usb_core_handle_struct *pudev, uint8_t *report, uint16_t len)
{
      for(uint8_t n = 0; n < 100; n ++)
{
            if(pudev->dev.status == USB_STATUS_CONFIGURED)  //检测USB连接状态
            {

                  usbd_ep_tx (pudev, CUSTOMHID_IN_EP, report, len);


            }

delay(1);
      }
return USBD_OK;
}

请问这三个判断是干什么用的
  if (pdev->dev_state == USBD_STATE_CONFIGURED)
  {
if (hhid->state == HID_IDLE)
{
   hhid->state = HID_BUSY;

如果去掉可不可以

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