LUFA/Drivers/USB/LowLevel/Host.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 #include "../HighLevel/USBMode.h"
  32
  33 #if defined(USB_CAN_BE_HOST)
  34
  35 #include "Host.h"
  36
  37 uint8_t USB_Host_WaitMS(uint8_t MS)
  38 {
  39         bool    BusSuspended = USB_Host_IsBusSuspended();
  40         uint8_t ErrorCode    = HOST_WAITERROR_Successful;
  41
  42         USB_INT_Clear(USB_INT_HSOFI);
  43         USB_Host_ResumeBus();
  44
  45         while (MS)
  46         {
  47                 if (USB_INT_HasOccurred(USB_INT_HSOFI))
  48                 {
  49                         USB_INT_Clear(USB_INT_HSOFI);
  50                         MS--;
  51                 }
  52
  53                 if ((USB_IsConnected == false) || (USB_CurrentMode == USB_MODE_DEVICE))
  54                 {
  55                         ErrorCode = HOST_WAITERROR_DeviceDisconnect;
  56
  57                         break;
  58                 }
  59
  60                 if (Pipe_IsError() == true)
  61                 {
  62                         Pipe_ClearError();
  63                         ErrorCode = HOST_WAITERROR_PipeError;
  64
  65                         break;
  66                 }
  67
  68                 if (Pipe_IsStalled() == true)
  69                 {
  70                         Pipe_ClearStall();
  71                         ErrorCode = HOST_WAITERROR_SetupStalled;
  72
  73                         break;
  74                 }
  75         }
  76
  77         if (BusSuspended)
  78           USB_Host_SuspendBus();
  79
  80         return ErrorCode;
  81 }
  82
  83 void USB_Host_ResetDevice(void)
  84 {
  85         bool BusSuspended = USB_Host_IsBusSuspended();
  86
  87         USB_INT_Disable(USB_INT_DDISCI);
  88
  89         USB_Host_ResetBus();
  90         while (!(USB_Host_IsBusResetComplete()));
  91
  92         USB_INT_Clear(USB_INT_HSOFI);
  93         USB_Host_ResumeBus();
  94
  95         for (uint8_t MSRem = 10; MSRem != 0; MSRem--)
  96         {
  97                 /* Workaround for powerless-pull-up devices. After a USB bus reset,
  98                    all disconnection interrupts are suppressed while a USB frame is
  99                    looked for - if it is found within 10ms, the device is still
 100                    present.                                                        */
 101
 102                 if (USB_INT_HasOccurred(USB_INT_HSOFI))
 103                 {
 104                         USB_INT_Clear(USB_INT_DDISCI);
 105                         break;
 106                 }
 107
 108                 _delay_ms(1);
 109         }
 110
 111         if (BusSuspended)
 112           USB_Host_SuspendBus();
 113
 114         USB_INT_Enable(USB_INT_DDISCI);
 115 }
 116 #endif