void USBH_Process(USB_OTG_CORE_HANDLE *pdev , USBH_HOST *phost)
{
volatile USBH_Status status = USBH_FAIL;
if ((HCD_IsDeviceConnected(pdev) == 0)&& (phost->gState != HOST_IDLE)) // 若是 未连接&&不空闲状态下
{
if(phost->gState != HOST_DEV_DISCONNECTED)
{
phost->gState = HOST_DEV_DISCONNECTED;
}
}
switch (phost->gState)
{
case HOST_IDLE : //空闲状态
if (HCD_IsDeviceConnected(pdev)) //如果 设备连接上了
{
phost->gState = HOST_DEV_ATTACHED; //就把状态转入 -> HOST_DEV_ATTACHED
USB_OTG_BSP_mDelay(100); //延时
}
break;
case HOST_DEV_ATTACHED : //接触状态(但是没有连接上)
phost->usr_cb->DeviceAttached(); //调用usbh_usr.c中的用户回调函数 ->USBH_USR_DeviceAttached()
phost->Control.hc_num_out = USBH_Alloc_Channel(pdev, 0x00); //给USB终端设备分配的传出通道
phost->Control.hc_num_in = USBH_Alloc_Channel(pdev, 0x80); //分配USB设备的传入通道
if ( HCD_ResetPort(pdev) == 0) //如果 检测到 复位命令
{
phost->usr_cb->ResetDevice(); //那么执行 USB复位,不是主机复位!
phost->device_prop.speed = HCD_GetCurrentSpeed(pdev); //获得当前设备的速度
phost->gState = HOST_ENUMERATION; //然后 状态转入 -> HOST_ENUMERATION
phost->usr_cb->DeviceSpeedDetected(phost->device_prop.speed); //调用用户回调函数,在LCD上显示设备速度信息
USBH_Open_Channel (pdev, //开启入口通道
phost->Control.hc_num_in,
phost->device_prop.address,