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Diffstat (limited to 'LUFA/Drivers/USB/LowLevel/OTG.h')
| -rw-r--r-- | LUFA/Drivers/USB/LowLevel/OTG.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/LUFA/Drivers/USB/LowLevel/OTG.h b/LUFA/Drivers/USB/LowLevel/OTG.h new file mode 100644 index 0000000..d213552 --- /dev/null +++ b/LUFA/Drivers/USB/LowLevel/OTG.h @@ -0,0 +1,155 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2010.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 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 true if currently sending a HNP to the other connected device, 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 true if a HNP is currently being issued by the connected device, 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
+
+/** @} */
+
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