-/*
- LUFA Library
- Copyright (C) Dean Camera, 2011.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
- Permission to use, copy, modify, distribute, and sell this
- software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
- all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaim all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
-*/
-
-/** \file
- * \brief USB OTG mode definitions.
- *
- * This file contains structures, function prototypes and macros related to USB OTG mode, where two USB devices
- * may be linked directly together and exchange host/device roles as needed.
- *
- * \note This file should not be included directly. It is automatically included as needed by the USB driver
- * dispatch header located in LUFA/Drivers/USB/USB.h.
- */
-
-/** \ingroup Group_USB
- * \defgroup Group_OTG USB On The Go (OTG) Management
- *
- * This module contains macros for embedded USB hosts with dual role On The Go capabilities, for managing role
- * exchange. OTG is a way for two USB dual role devices to talk to one another directly without fixed device/host
- * roles.
- *
- * @{
- */
-
-#ifndef __USBOTG_H__
-#define __USBOTG_H__
-
- /* Includes: */
- #include <avr/io.h>
- #include <stdbool.h>
-
- #include "../../../Common/Common.h"
-
- /* Preprocessor Checks: */
- #if !defined(__INCLUDE_FROM_USB_DRIVER)
- #error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
- #endif
-
- /* Public Interface - May be used in end-application: */
- /* Macros: */
- /** Mask for the VBUS pulsing method of SRP, supported by some OTG devices.
- *
- * \see \ref USB_OTG_Device_InitiateSRP().
- */
- #define USB_OTG_SRP_VBUS (1 << SRPSEL)
-
- /** Mask for the Data + pulsing method of SRP, supported by some OTG devices.
- *
- * \see \ref USB_OTG_Device_InitiateSRP().
- */
- #define USB_OTG_STP_DATA 0
-
- /* Inline Functions: */
- /** Initiate a Host Negotiation Protocol request. This indicates to the other connected device
- * that the device wishes to change device/host roles.
- */
- static inline void USB_OTG_Device_RequestHNP(void) ATTR_ALWAYS_INLINE;
- static inline void USB_OTG_Device_RequestHNP(void)
- {
- OTGCON |= (1 << HNPREQ);
- }
-
- /** Cancel a Host Negotiation Protocol request. This stops a pending HNP request to the other
- * connected device.
- */
- static inline void USB_OTG_Device_CancelHNPRequest(void) ATTR_ALWAYS_INLINE;
- static inline void USB_OTG_Device_CancelHNPRequest(void)
- {
- OTGCON &= ~(1 << HNPREQ);
- }
-
- /** Determines if the device is currently sending a HNP to an attached host.
- *
- * \return Boolean \c true if currently sending a HNP to the other connected device, \c false otherwise
- */
- static inline bool USB_OTG_Device_IsSendingHNP(void) ATTR_ALWAYS_INLINE;
- static inline bool USB_OTG_Device_IsSendingHNP(void)
- {
- return ((OTGCON & (1 << HNPREQ)) ? true : false);
- }
-
- /** Initiates a Session Request Protocol request. Most OTG devices turn off VBUS when the USB
- * interface is not in use, to conserve power. Sending a SRP to a USB OTG device running in
- * host mode indicates that VBUS should be applied and a session started.
- *
- * There are two different methods of sending a SRP - either pulses on the VBUS line, or by
- * pulsing the Data + line via the internal pull-up resistor.
- *
- * \param[in] SRPTypeMask Mask indicating the type of SRP to use, either \ref USB_OTG_SRP_VBUS or
- * \ref USB_OTG_STP_DATA.
- */
- static inline void USB_OTG_Device_InitiateSRP(const uint8_t SRPTypeMask) ATTR_ALWAYS_INLINE;
- static inline void USB_OTG_Device_InitiateSRP(const uint8_t SRPTypeMask)
- {
- OTGCON = ((OTGCON & ~(1 << SRPSEL)) | (SRPTypeMask | (1 << SRPREQ)));
- }
-
- /** Accepts a HNP from a connected device, indicating that both devices should exchange
- * device/host roles.
- */
- static inline void USB_OTG_Host_AcceptHNP(void) ATTR_ALWAYS_INLINE;
- static inline void USB_OTG_Host_AcceptHNP(void)
- {
- OTGCON |= (1 << HNPREQ);
- }
-
- /** Rejects a HNP from a connected device, indicating that both devices should remain in their
- * current device/host roles.
- */
- static inline void USB_OTG_Host_RejectHNP(void) ATTR_ALWAYS_INLINE;
- static inline void USB_OTG_Host_RejectHNP(void)
- {
- OTGCON &= ~(1 << HNPREQ);
- }
-
- /** Indicates if the connected device is not currently sending a HNP request.
- *
- * \return Boolean \c true if a HNP is currently being issued by the connected device, \c false otherwise.
- */
- static inline bool USB_OTG_Host_IsHNPReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
- static inline bool USB_OTG_Host_IsHNPReceived(void)
- {
- return ((OTGCON & (1 << HNPREQ)) ? true : false);
- }
-
-#endif
-
-/** @} */
-
projects / pub / lufa.git / blobdiff