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103 lines
4.2 KiB
103 lines
4.2 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Macros for embedded USB hosts with dual role On The Go capabilities, for managing role exchange. OTG
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* is a way for two USB dual role devices to talk to one another directly without fixed device/host roles.
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*
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* \note These macros are only for AVRs which support the OTG protocol, and do not exist for device-only AVRs.
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*/
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#ifndef __USBOTG_H__
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#define __USBOTG_H__
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/* Includes: */
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#include <avr/io.h>
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#include <stdbool.h>
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#include "../../../Common/Common.h"
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Initiate a Host Negotiation Protocol request. This indicates to the other connected device
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* that the device wishes to change device/host roles.
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*/
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#define USB_OTG_DEV_Request_HNP() MACROS{ OTGCON |= (1 << HNPREQ); }MACROE
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/** Cancel a Host Negotiation Protocol request. This stops a pending HNP request to the other
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* connected device.
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*/
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#define USB_OTG_DEV_Cancel_HNP_Request() MACROS{ OTGCON &= ~(1 << HNPREQ); }MACROE
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/** Returns boolean false if not currently sending a HNP to the other connected device, or true
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* if a HNP is currently being issued.
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*/
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#define USB_OTG_DEV_IsSendingHNP() ((OTGCON & (1 << HNPREQ)) ? true : false)
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/** Accepts a HNP from a connected device, indicating that both devices should exchange
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* device/host roles.
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*/
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#define USB_OTG_HOST_Accept_HNP() USB_OTG_DEV_Request_HNP()
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/** Rejects a HNP from a connected device, indicating that both devices should remain in their
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* current device/host roles.
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*/
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#define USB_OTG_HOST_Reject_HNP() USB_OTG_DEV_Cancel_HNP_Request()
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/** Returns boolean false if the connected device is not currently sending a HNP request, or true
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* if a HNP is currently being issued by the connected device.
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*/
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#define USB_OTG_HOST_IsHNPReceived() ((OTGCON & (1 << HNPREQ)) ? true : false)
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/** Initiates a Session Request Protocol request. Most OTG devices turn off VBUS when the USB
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* interface is not in use, to conserve power. Sending a SRP to a USB OTG device running in
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* host mode indicates that VBUS should be applied and a session started.
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*
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* There are two different methods of sending a SRP - either pulses on the VBUS line, or by
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* pulsing the Data + line via the internal pullup resistor. The SRP mode is given as the
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* "type" parameter, and can be either USB_OTG_SRP_VBUS or USB_OTG_STP_DATA.
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*/
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#define USB_OTG_DEV_Initiate_SRP(type) MACROS{ OTGCON = ((OTGCON & ~(1 << SRPSEL)) | (type | (1 << SRPREQ))); }MACROE
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/** Mask for the VBUS pulsing method of SRP, supported by some OTG devices.
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*
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* \see USB_OTG_DEV_Initiate_SRP()
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*/
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#define USB_OTG_SRP_VBUS (1 << SRPSEL)
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/** Mask for the Data + pulsing method of SRP, supported by some OTG devices.
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*
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* \see USB_OTG_DEV_Initiate_SRP()
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*/
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#define USB_OTG_STP_DATA 0
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#endif
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