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154 lines
5.6 KiB
154 lines
5.6 KiB
/* |
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LUFA Library |
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Copyright (C) Dean Camera, 2010. |
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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 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) |
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Permission to use, copy, modify, distribute, and sell this |
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software and its documentation for any purpose is hereby granted |
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without fee, provided that the above copyright notice appear in |
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all 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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* \brief USB OTG mode definitions. |
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* |
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* This file contains structures, function prototypes and macros related to USB OTG mode, where two USB devices |
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* may be linked directly together and exchange host/device roles as needed. |
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* |
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* \note This file should not be included directly. It is automatically included as needed by the USB driver |
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* dispatch header located in LUFA/Drivers/USB/USB.h. |
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*/ |
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/** \ingroup Group_USB |
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* @defgroup Group_OTG USB On The Go (OTG) Management |
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* |
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* This module contains macros for embedded USB hosts with dual role On The Go capabilities, for managing role |
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* exchange. OTG is a way for two USB dual role devices to talk to one another directly without fixed device/host |
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* roles. |
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* |
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* @{ |
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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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/* Preprocessor Checks: */ |
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#if !defined(__INCLUDE_FROM_USB_DRIVER) |
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#error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead. |
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#endif |
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/* Public Interface - May be used in end-application: */ |
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/* Macros: */ |
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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 \ref USB_OTG_Device_InitiateSRP(). |
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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 \ref USB_OTG_Device_InitiateSRP(). |
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*/ |
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#define USB_OTG_STP_DATA 0 |
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/* Inline Functions: */ |
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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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static inline void USB_OTG_Device_RequestHNP(void) ATTR_ALWAYS_INLINE; |
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static inline void USB_OTG_Device_RequestHNP(void) |
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{ |
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OTGCON |= (1 << HNPREQ); |
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} |
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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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static inline void USB_OTG_Device_CancelHNPRequest(void) ATTR_ALWAYS_INLINE; |
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static inline void USB_OTG_Device_CancelHNPRequest(void) |
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{ |
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OTGCON &= ~(1 << HNPREQ); |
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} |
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/** Determines if the device is currently sending a HNP to an attached host. |
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* |
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* \return Boolean true if currently sending a HNP to the other connected device, false otherwise |
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*/ |
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static inline bool USB_OTG_Device_IsSendingHNP(void) ATTR_ALWAYS_INLINE; |
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static inline bool USB_OTG_Device_IsSendingHNP(void) |
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{ |
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return ((OTGCON & (1 << HNPREQ)) ? true : false); |
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} |
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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 pull-up resistor. |
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* |
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* \param[in] SRPTypeMask Mask indicating the type of SRP to use, either \ref USB_OTG_SRP_VBUS or |
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* \ref USB_OTG_STP_DATA. |
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*/ |
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static inline void USB_OTG_Device_InitiateSRP(const uint8_t SRPTypeMask) ATTR_ALWAYS_INLINE; |
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static inline void USB_OTG_Device_InitiateSRP(const uint8_t SRPTypeMask) |
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{ |
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OTGCON = ((OTGCON & ~(1 << SRPSEL)) | (SRPTypeMask | (1 << SRPREQ))); |
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} |
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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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static inline void USB_OTG_Host_AcceptHNP(void) ATTR_ALWAYS_INLINE; |
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static inline void USB_OTG_Host_AcceptHNP(void) |
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{ |
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OTGCON |= (1 << HNPREQ); |
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} |
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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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static inline void USB_OTG_Host_RejectHNP(void) ATTR_ALWAYS_INLINE; |
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static inline void USB_OTG_Host_RejectHNP(void) |
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{ |
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OTGCON &= ~(1 << HNPREQ); |
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} |
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/** Indicates if the connected device is not currently sending a HNP request. |
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* |
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* \return Boolean true if a HNP is currently being issued by the connected device, false otherwise. |
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*/ |
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static inline bool USB_OTG_Host_IsHNPReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE; |
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static inline bool USB_OTG_Host_IsHNPReceived(void) |
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{ |
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return ((OTGCON & (1 << HNPREQ)) ? true : false); |
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} |
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#endif |
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/** @} */
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