path: root/LUFA/Drivers/USB/LowLevel/USBController.h

/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  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 low level USB controller definitions.
 *
 *  This file contains structures, function prototypes and macros related to the low level configuration of the
 *  USB controller, to start, stop and reset the USB library core.
 *
 *  \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_USBManagement USB Interface Management
 *
 *  Functions, macros, variables, enums and types related to the setup and management of the USB interface.
 *
 *  @{
 */

#ifndef __USBCONTROLLER_H__
#define __USBCONTROLLER_H__

	/* Includes: */
		#include <avr/io.h>
		#include <avr/interrupt.h>
		#include <stdbool.h>
		
		#include "../HighLevel/USBMode.h"

		#include "../../../Common/Common.h"
		#include "../HighLevel/USBMode.h"
		#include "../HighLevel/Events.h"
		#include "../HighLevel/USBTask.h"
		#include "USBInterrupt.h"
		
		#if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
			#include "Host.h"
			#include "OTG.h"
			#include "Pipe.h"
			#include "../HighLevel/HostStandardReq.h"
			#include "../HighLevel/PipeStream.h"
		#endif
		
		#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
			#include "Device.h"
			#include "Endpoint.h"
			#include "../HighLevel/DeviceStandardReq.h"
			#include "../HighLevel/EndpointStream.h"
		#endif

	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Preprocessor Checks and Defines: */
		#if !defined(__INCLUDE_FROM_USB_DRIVER)
			#error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
		#endif

		#if !defined(F_CLOCK)
			#error F_CLOCK is not defined. You must define F_CLOCK to the frequency of the unprescaled input clock in your project makefile.
		#endif
	
		#if (F_CLOCK == 8000000)
			#if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
			     defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || \
			     defined(__AVR_ATmega32U2__))
				#define USB_PLL_PSC                0
			#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
				#define USB_PLL_PSC                0
			#elif (defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB1286__) || defined(__AVR_ATmega32U6__))
				#define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
			#elif (defined(__AVR_AT90USB647__)  || defined(__AVR_AT90USB1287__))
				#define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
			#endif
		#elif (F_CLOCK == 16000000)
			#if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
			     defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || \
			     defined(__AVR_ATmega32U2__))
				#define USB_PLL_PSC                (1 << PLLP0)
			#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
				#define USB_PLL_PSC                (1 << PINDIV)
			#elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_ATmega32U6__))
				#define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP1))
			#elif (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__))
				#define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP0))
			#endif
		#endif
		
		#if !defined(USB_PLL_PSC)
			#error No PLL prescale value available for chosen F_CPU value and AVR model.
		#endif
		
	/* Public Interface - May be used in end-application: */
		/* Macros: */			
			/** Regulator disable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
			 *  regulator should be enabled to regulate the data pin voltages to within the USB standard.
			 *
			 *  \note See USB AVR data sheet for more information on the internal pad regulator.
			 */
			#define USB_OPT_REG_DISABLED               (1 << 1)

			/** Regulator enable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
			 *  regulator should be disabled and the AVR's VCC level used for the data pads.
			 *
			 *  \note See USB AVR data sheet for more information on the internal pad regulator.
			 */
			#define USB_OPT_REG_ENABLED                (0 << 1)
			
			/** Manual PLL control option mask for \ref USB_Init(). This indicates to the library that the user application
			 *  will take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
			 *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
			 */
			#define USB_OPT_MANUAL_PLL                 (1 << 2)

			/** Automatic PLL control option mask for \ref USB_Init(). This indicates to the library that the library should
			 *  take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
			 *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
			 */
			#define USB_OPT_AUTO_PLL                   (0 << 2)

			/** Mask for a CONTROL type endpoint or pipe.
			 *
			 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
			 */
			#define EP_TYPE_CONTROL                    0x00

			/** Mask for an ISOCHRONOUS type endpoint or pipe.
			 *
			 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
			 */
			#define EP_TYPE_ISOCHRONOUS                0x01

			/** Mask for a BULK type endpoint or pipe.
			 *
			 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
			 */
			#define EP_TYPE_BULK                       0x02

			/** Mask for an INTERRUPT type endpoint or pipe.
			 *
			 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
			 */
			#define EP_TYPE_INTERRUPT                  0x03

			#if !defined(USB_STREAM_TIMEOUT_MS) || defined(__DOXYGEN__)
				/** Constant for the maximum software timeout period of the USB data stream transfer functions
				 *  (both control and standard) when in either device or host mode. If the next packet of a stream
				 *  is not received or acknowledged within this time period, the stream function will fail.
				 *
				 *  This value may be overridden in the user project makefile as the value of the 
				 *  \ref USB_STREAM_TIMEOUT_MS token, and passed to the compiler using the -D switch.
				 */
				#define USB_STREAM_TIMEOUT_MS       100
			#endif
		
		/* Inline Functions: */
			#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR) || defined(__DOXYGEN__)
				/** Returns boolean true if the VBUS line is currently high (i.e. the USB host is supplying power),
				 *  otherwise returns false.
				 *
				 *  \note This function is not available on some AVR models which do not support hardware VBUS monitoring.
				 */
				static inline bool USB_VBUS_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
				static inline bool USB_VBUS_GetStatus(void)
				{
					return ((USBSTA & (1 << VBUS)) ? true : false);
				}
			#endif

			/** Detaches the device from the USB bus. This has the effect of removing the device from any
			 *  attached host, ceasing USB communications. If no host is present, this prevents any host from
			 *  enumerating the device once attached until \ref USB_Attach() is called.
			 */
			static inline void USB_Detach(void) ATTR_ALWAYS_INLINE;
			static inline void USB_Detach(void)
			{
				UDCON  |=  (1 << DETACH);
			}

			/** Attaches the device to the USB bus. This announces the device's presence to any attached
			 *  USB host, starting the enumeration process. If no host is present, attaching the device
			 *  will allow for enumeration once a host is connected to the device.
			 *
			 *  This is inexplicably also required for proper operation while in host mode, to enable the
			 *  attachment of a device to the host. This is despite the bit being located in the device-mode
			 *  register and despite the datasheet making no mention of its requirement in host mode.
			 */
			static inline void USB_Attach(void) ATTR_ALWAYS_INLINE;
			static inline void USB_Attach(void)
			{
				UDCON  &= ~(1 << DETACH);
			}

		/* Function Prototypes: */
			/** Main function to initialize and start the USB interface. Once active, the USB interface will
			 *  allow for device connection to a host when in device mode, or for device enumeration while in
			 *  host mode.
			 *
			 *  As the USB library relies on interrupts for the device and host mode enumeration processes,
			 *  the user must enable global interrupts before or shortly after this function is called. In
			 *  device mode, interrupts must be enabled within 500ms of this function being called to ensure
			 *  that the host does not time out whilst enumerating the device. In host mode, interrupts may be
			 *  enabled at the application's leisure however enumeration will not begin of an attached device
			 *  until after this has occurred.
			 *
			 *  Calling this function when the USB interface is already initialized will cause a complete USB
			 *  interface reset and re-enumeration.
			 *
			 *  \param[in] Mode     This is a mask indicating what mode the USB interface is to be initialized to, a value
			 *                      from the \ref USB_Modes_t enum.
			 *
			 *  \param[in] Options  Mask indicating the options which should be used when initializing the USB
			 *                      interface to control the USB interface's behaviour. This should be comprised of
			 *                      a USB_OPT_REG_* mask to control the regulator, a USB_OPT_*_PLL mask to control the
			 *                      PLL, and a USB_DEVICE_OPT_* mask (when the device mode is enabled) to set the device
			 *                      mode speed.
			 *
			 *  \note To reduce the FLASH requirements of the library if only device or host mode is required, 
			 *        the mode can be statically set in the project makefile by defining the token USB_DEVICE_ONLY
			 *        (for device mode) or USB_HOST_ONLY (for host mode), passing the token to the compiler 
			 *        via the -D switch. If the mode is statically set, this parameter does not exist in the
			 *        function prototype.
			 *        \n\n
			 *
			 *  \note To reduce the FLASH requirements of the library if only fixed settings are are required,
			 *        the options may be set statically in the same manner as the mode (see the Mode parameter of 
			 *        this function). To statically set the USB options, pass in the USE_STATIC_OPTIONS token,
			 *        defined to the appropriate options masks. When the options are statically set, this
			 *        parameter does not exist in the function prototype.
			 *        \n\n
			 *        
			 *  \note The mode parameter does not exist on devices where only one mode is possible, such as USB 
			 *        AVR models which only implement the USB device mode in hardware.
			 *
			 *  \see Device.h for the USB_DEVICE_OPT_* masks.
			 */
			void USB_Init(
			               #if defined(USB_CAN_BE_BOTH) || defined(__DOXYGEN__)
			               const uint8_t Mode
			               #endif

			               #if (defined(USB_CAN_BE_BOTH) && !defined(USE_STATIC_OPTIONS)) || defined(__DOXYGEN__)
			               ,
			               #elif (!defined(USB_CAN_BE_BOTH) && defined(USE_STATIC_OPTIONS))
			               void
			               #endif

			               #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
			               const uint8_t Options
			               #endif
			               );
			
			/** Shuts down the USB interface. This turns off the USB interface after deallocating all USB FIFO
			 *  memory, endpoints and pipes. When turned off, no USB functionality can be used until the interface
			 *  is restarted with the \ref USB_Init() function.
			 */
			void USB_ShutDown(void);

			/** Resets the interface, when already initialized. This will re-enumerate the device if already connected
			 *  to a host, or re-enumerate an already attached device when in host mode.
			 */
			void USB_ResetInterface(void);

		/* Global Variables: */
			#if (!defined(USB_HOST_ONLY) && !defined(USB_DEVICE_ONLY)) || defined(__DOXYGEN__)
				/** Indicates the mode that the USB interface is currently initialized to, a value from the
				 *  \ref USB_Modes_t enum.
				 *
				 *  \note This variable should be treated as read-only in the user application, and never manually
				 *        changed in value.
				 *        \n\n
				 *
				 *  \note When the controller is initialized into UID autodetection mode, this variable will hold the
				 *        currently selected USB mode (i.e. \ref USB_MODE_Device or \ref USB_MODE_Host). If the controller
				 *        is fixed into a specific mode (either through the USB_DEVICE_ONLY or USB_HOST_ONLY compile time
				 *        options, or a limitation of the USB controller in the chosen device model) this will evaluate to
				 *        a constant of the appropriate value and will never evaluate to \ref USB_MODE_None even when the
				 *        USB interface is not initialized.
				 */
				extern volatile uint8_t USB_CurrentMode;
			#elif defined(USB_HOST_ONLY)
				#define USB_CurrentMode USB_MODE_Host
			#elif defined(USB_DEVICE_ONLY)
				#define USB_CurrentMode USB_MODE_Device
			#endif
			
			#if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
				/** Indicates the current USB options that the USB interface was initialized with when \ref USB_Init()
				 *  was called. This value will be one of the USB_MODE_* masks defined elsewhere in this module.
				 *
				 *  \note This variable should be treated as read-only in the user application, and never manually
				 *        changed in value.
				 */
				extern volatile uint8_t USB_Options;
			#elif defined(USE_STATIC_OPTIONS)
				#define USB_Options USE_STATIC_OPTIONS
			#endif

		/* Enums: */
			/** Enum for the possible USB controller modes, for initialization via \ref USB_Init() and indication back to the
			 *  user application via \ref USB_CurrentMode.
			 */
			enum USB_Modes_t
			{
				USB_MODE_None   = 0, /**< Indicates that the controller is currently not initialized in any specific USB mode. */
				USB_MODE_Device = 1, /**< Indicates that the controller is currently initialized in USB Device mode. */
				USB_MODE_Host   = 2, /**< Indicates that the controller is currently initialized in USB Host mode. */
				USB_MODE_UID    = 3, /**< Indicates that the controller should determine the USB mode from the UID pin of the
				                      *   USB connector.
				                      */
			};

	/* Private Interface - For use in library only: */
	#if !defined(__DOXYGEN__)
		/* Function Prototypes: */
			#if defined(__INCLUDE_FROM_USB_CONTROLLER_C)
				#if defined(USB_CAN_BE_DEVICE)
				static void USB_Init_Device(void);
				#endif
				
				#if defined(USB_CAN_BE_HOST)
				static void USB_Init_Host(void);
				#endif
			#endif
	
		/* Inline Functions: */
			static inline void USB_PLL_On(void) ATTR_ALWAYS_INLINE;
			static inline void USB_PLL_On(void)
			{
				PLLCSR  = USB_PLL_PSC;
				PLLCSR |= (1 << PLLE);
			}
			
			static inline void USB_PLL_Off(void) ATTR_ALWAYS_INLINE;
			static inline void USB_PLL_Off(void)
			{
				PLLCSR  = 0;
			}
			
			static inline bool USB_PLL_IsReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline bool USB_PLL_IsReady(void)
			{
				return ((PLLCSR  &   (1 << PLOCK)) ? true : false);
			}

			static inline void USB_REG_On(void) ATTR_ALWAYS_INLINE;
			static inline void USB_REG_On(void)
			{
			#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
				UHWCON  |=  (1 << UVREGE);
			#else
				REGCR   &= ~(1 << REGDIS);
			#endif			
			}

			static inline void USB_REG_Off(void) ATTR_ALWAYS_INLINE;
			static inline void USB_REG_Off(void)
			{
			#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
				UHWCON  &= ~(1 << UVREGE);
			#else
				REGCR   |=  (1 << REGDIS);
			#endif			
			}
			
			#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
			static inline void USB_OTGPAD_On(void) ATTR_ALWAYS_INLINE;
			static inline void USB_OTGPAD_On(void)
			{
				USBCON  |=  (1 << OTGPADE);
			}

			static inline void USB_OTGPAD_Off(void) ATTR_ALWAYS_INLINE;
			static inline void USB_OTGPAD_Off(void)
			{
				USBCON  &= ~(1 << OTGPADE);
			}
			#endif

			static inline void USB_CLK_Freeze(void) ATTR_ALWAYS_INLINE;
			static inline void USB_CLK_Freeze(void)
			{
				USBCON  |=  (1 << FRZCLK);
			}
			
			static inline void USB_CLK_Unfreeze(void) ATTR_ALWAYS_INLINE;
			static inline void USB_CLK_Unfreeze(void)
			{
				USBCON  &= ~(1 << FRZCLK);
			}
			
			static inline void USB_Controller_Enable(void) ATTR_ALWAYS_INLINE;
			static inline void USB_Controller_Enable(void)
			{
				USBCON  |=  (1 << USBE);
			}

			static inline void USB_Controller_Disable(void) ATTR_ALWAYS_INLINE;
			static inline void USB_Controller_Disable(void)
			{
				USBCON  &= ~(1 << USBE);
			}

			static inline void USB_Controller_Reset(void) ATTR_ALWAYS_INLINE;
			static inline void USB_Controller_Reset(void)
			{
				const uint8_t Temp = USBCON;
				
				USBCON = (Temp & ~(1 << USBE));
				USBCON = (Temp |  (1 << USBE));
			}
	
			#if defined(USB_CAN_BE_BOTH)
			static inline uint8_t USB_GetUSBModeFromUID(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
			static inline uint8_t USB_GetUSBModeFromUID(void)
			{
				if (USBSTA & (1 << ID))
				  return USB_MODE_Device;
				else
				  return USB_MODE_Host;
			}
			#endif

	#endif
	
	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif
			
#endif

/** @} */