LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *  \brief USB Controller definitions for the AVR8 microcontrollers.
  33  *  \copydetails Group_USBManagement_AVR8
  34  *
  35  *  \note This file should not be included directly. It is automatically included as needed by the USB driver
  36  *        dispatch header located in LUFA/Drivers/USB/USB.h.
  37  */
  38
  39 /** \ingroup Group_USBManagement
  40  *  \defgroup Group_USBManagement_AVR8 USB Interface Management (AVR8)
  41  *  \brief USB Controller definitions for the AVR8 microcontrollers.
  42  *
  43  *  Functions, macros, variables, enums and types related to the setup and management of the USB interface.
  44  *
  45  *  @{
  46  */
  47
  48 #ifndef __USBCONTROLLER_AVR8_H__
  49 #define __USBCONTROLLER_AVR8_H__
  50
  51         /* Includes: */
  52                 #include "../../../../Common/Common.h"
  53                 #include "../USBMode.h"
  54                 #include "../Events.h"
  55                 #include "../USBTask.h"
  56                 #include "../USBInterrupt.h"
  57
  58                 #if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
  59                         #include "../Host.h"
  60                         #include "../OTG.h"
  61                         #include "../Pipe.h"
  62                         #include "../HostStandardReq.h"
  63                         #include "../PipeStream.h"
  64                 #endif
  65
  66                 #if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
  67                         #include "../Device.h"
  68                         #include "../Endpoint.h"
  69                         #include "../DeviceStandardReq.h"
  70                         #include "../EndpointStream.h"
  71                 #endif
  72
  73         /* Enable C linkage for C++ Compilers: */
  74                 #if defined(__cplusplus)
  75                         extern "C" {
  76                 #endif
  77
  78         /* Preprocessor Checks and Defines: */
  79                 #if !defined(__INCLUDE_FROM_USB_DRIVER)
  80                         #error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
  81                 #endif
  82
  83                 #if !defined(F_USB)
  84                         #error F_USB is not defined. You must define F_USB to the frequency of the unprescaled USB controller clock in your project makefile.
  85                 #endif
  86
  87                 #if (F_USB == 8000000)
  88                         #if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
  89                              defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || \
  90                              defined(__AVR_ATmega32U2__))
  91                                 #define USB_PLL_PSC                0
  92                         #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
  93                                 #define USB_PLL_PSC                0
  94                         #elif (defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB1286__) || defined(__AVR_ATmega32U6__))
  95                                 #define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
  96                         #elif (defined(__AVR_AT90USB647__)  || defined(__AVR_AT90USB1287__))
  97                                 #define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
  98                         #endif
  99                 #elif (F_USB == 16000000)
 100                         #if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
 101                              defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || \
 102                              defined(__AVR_ATmega32U2__))
 103                                 #define USB_PLL_PSC                (1 << PLLP0)
 104                         #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
 105                                 #define USB_PLL_PSC                (1 << PINDIV)
 106                         #elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_ATmega32U6__))
 107                                 #define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP1))
 108                         #elif (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__))
 109                                 #define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP0))
 110                         #endif
 111                 #endif
 112
 113                 #if !defined(USB_PLL_PSC)
 114                         #error No PLL prescale value available for chosen F_USB value and AVR model.
 115                 #endif
 116
 117         /* Public Interface - May be used in end-application: */
 118                 /* Macros: */
 119                         /** \name USB Controller Option Masks */
 120                         //@{
 121                         /** Regulator disable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
 122                          *  regulator should be disabled and the AVR's VCC level used for the data pads.
 123                          *
 124                          *  \note See USB AVR data sheet for more information on the internal pad regulator.
 125                          */
 126                         #define USB_OPT_REG_DISABLED               (1 << 1)
 127
 128                         /** Regulator enable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
 129                          *  regulator should be enabled to regulate the data pin voltages from the VBUS level down to a level within
 130                          *  the range allowable by the USB standard.
 131                          *
 132                          *  \note See USB AVR data sheet for more information on the internal pad regulator.
 133                          */
 134                         #define USB_OPT_REG_ENABLED                (0 << 1)
 135
 136                         /** Manual PLL control option mask for \ref USB_Init(). This indicates to the library that the user application
 137                          *  will take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
 138                          *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
 139                          */
 140                         #define USB_OPT_MANUAL_PLL                 (1 << 2)
 141
 142                         /** Automatic PLL control option mask for \ref USB_Init(). This indicates to the library that the library should
 143                          *  take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
 144                          *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
 145                          */
 146                         #define USB_OPT_AUTO_PLL                   (0 << 2)
 147                         //@}
 148
 149                         /** \name Endpoint/Pipe Type Masks */
 150                         //@{
 151                         /** Mask for a CONTROL type endpoint or pipe.
 152                          *
 153                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 154                          */
 155                         #define EP_TYPE_CONTROL                    0x00
 156
 157                         /** Mask for an ISOCHRONOUS type endpoint or pipe.
 158                          *
 159                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 160                          */
 161                         #define EP_TYPE_ISOCHRONOUS                0x01
 162
 163                         /** Mask for a BULK type endpoint or pipe.
 164                          *
 165                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 166                          */
 167                         #define EP_TYPE_BULK                       0x02
 168
 169                         /** Mask for an INTERRUPT type endpoint or pipe.
 170                          *
 171                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 172                          */
 173                         #define EP_TYPE_INTERRUPT                  0x03
 174                         //@}
 175
 176                         #if !defined(USB_STREAM_TIMEOUT_MS) || defined(__DOXYGEN__)
 177                                 /** Constant for the maximum software timeout period of the USB data stream transfer functions
 178                                  *  (both control and standard) when in either device or host mode. If the next packet of a stream
 179                                  *  is not received or acknowledged within this time period, the stream function will fail.
 180                                  *
 181                                  *  This value may be overridden in the user project makefile as the value of the
 182                                  *  \ref USB_STREAM_TIMEOUT_MS token, and passed to the compiler using the -D switch.
 183                                  */
 184                                 #define USB_STREAM_TIMEOUT_MS       100
 185                         #endif
 186
 187                 /* Inline Functions: */
 188                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR) || defined(__DOXYGEN__)
 189                                 /** Determines if the VBUS line is currently high (i.e. the USB host is supplying power).
 190                                  *
 191                                  *  \note This function is not available on some AVR models which do not support hardware VBUS monitoring.
 192                                  *
 193                                  *  \return Boolean \c true if the VBUS line is currently detecting power from a host, \c false otherwise.
 194                                  */
 195                                 static inline bool USB_VBUS_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 196                                 static inline bool USB_VBUS_GetStatus(void)
 197                                 {
 198                                         return ((USBSTA & (1 << VBUS)) ? true : false);
 199                                 }
 200                         #endif
 201
 202                         /** Detaches the device from the USB bus. This has the effect of removing the device from any
 203                          *  attached host, ceasing USB communications. If no host is present, this prevents any host from
 204                          *  enumerating the device once attached until \ref USB_Attach() is called.
 205                          */
 206                         static inline void USB_Detach(void) ATTR_ALWAYS_INLINE;
 207                         static inline void USB_Detach(void)
 208                         {
 209                                 UDCON  |=  (1 << DETACH);
 210                         }
 211
 212                         /** Attaches the device to the USB bus. This announces the device's presence to any attached
 213                          *  USB host, starting the enumeration process. If no host is present, attaching the device
 214                          *  will allow for enumeration once a host is connected to the device.
 215                          *
 216                          *  This is inexplicably also required for proper operation while in host mode, to enable the
 217                          *  attachment of a device to the host. This is despite the bit being located in the device-mode
 218                          *  register and despite the datasheet making no mention of its requirement in host mode.
 219                          */
 220                         static inline void USB_Attach(void) ATTR_ALWAYS_INLINE;
 221                         static inline void USB_Attach(void)
 222                         {
 223                                 UDCON  &= ~(1 << DETACH);
 224                         }
 225
 226                 /* Function Prototypes: */
 227                         /** Main function to initialize and start the USB interface. Once active, the USB interface will
 228                          *  allow for device connection to a host when in device mode, or for device enumeration while in
 229                          *  host mode.
 230                          *
 231                          *  As the USB library relies on interrupts for the device and host mode enumeration processes,
 232                          *  the user must enable global interrupts before or shortly after this function is called. In
 233                          *  device mode, interrupts must be enabled within 500ms of this function being called to ensure
 234                          *  that the host does not time out whilst enumerating the device. In host mode, interrupts may be
 235                          *  enabled at the application's leisure however enumeration will not begin of an attached device
 236                          *  until after this has occurred.
 237                          *
 238                          *  Calling this function when the USB interface is already initialized will cause a complete USB
 239                          *  interface reset and re-enumeration.
 240                          *
 241                          *  \param[in] Mode     This is a mask indicating what mode the USB interface is to be initialized to, a value
 242                          *                      from the \ref USB_Modes_t enum.
 243                          *
 244                          *  \param[in] Options  Mask indicating the options which should be used when initializing the USB
 245                          *                      interface to control the USB interface's behaviour. This should be comprised of
 246                          *                      a \c USB_OPT_REG_* mask to control the regulator, a \c USB_OPT_*_PLL mask to control the
 247                          *                      PLL, and a \c USB_DEVICE_OPT_* mask (when the device mode is enabled) to set the device
 248                          *                      mode speed.
 249                          *
 250                          *  \note To reduce the FLASH requirements of the library if only device or host mode is required,
 251                          *        the mode can be statically set in the project makefile by defining the token \c USB_DEVICE_ONLY
 252                          *        (for device mode) or \c USB_HOST_ONLY (for host mode), passing the token to the compiler
 253                          *        via the -D switch. If the mode is statically set, this parameter does not exist in the
 254                          *        function prototype.
 255                          *        \n\n
 256                          *
 257                          *  \note To reduce the FLASH requirements of the library if only fixed settings are are required,
 258                          *        the options may be set statically in the same manner as the mode (see the Mode parameter of
 259                          *        this function). To statically set the USB options, pass in the \c USE_STATIC_OPTIONS token,
 260                          *        defined to the appropriate options masks. When the options are statically set, this
 261                          *        parameter does not exist in the function prototype.
 262                          *        \n\n
 263                          *
 264                          *  \note The mode parameter does not exist on devices where only one mode is possible, such as USB
 265                          *        AVR models which only implement the USB device mode in hardware.
 266                          *
 267                          *  \see \ref Group_Device for the \c USB_DEVICE_OPT_* masks.
 268                          */
 269                         void USB_Init(
 270                                        #if defined(USB_CAN_BE_BOTH) || defined(__DOXYGEN__)
 271                                        const uint8_t Mode
 272                                        #endif
 273
 274                                        #if (defined(USB_CAN_BE_BOTH) && !defined(USE_STATIC_OPTIONS)) || defined(__DOXYGEN__)
 275                                        ,
 276                                        #elif (!defined(USB_CAN_BE_BOTH) && defined(USE_STATIC_OPTIONS))
 277                                        void
 278                                        #endif
 279
 280                                        #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 281                                        const uint8_t Options
 282                                        #endif
 283                                        );
 284
 285                         /** Shuts down the USB interface. This turns off the USB interface after deallocating all USB FIFO
 286                          *  memory, endpoints and pipes. When turned off, no USB functionality can be used until the interface
 287                          *  is restarted with the \ref USB_Init() function.
 288                          */
 289                         void USB_Disable(void);
 290
 291                         /** Resets the interface, when already initialized. This will re-enumerate the device if already connected
 292                          *  to a host, or re-enumerate an already attached device when in host mode.
 293                          */
 294                         void USB_ResetInterface(void);
 295
 296                 /* Global Variables: */
 297                         #if (!defined(USB_HOST_ONLY) && !defined(USB_DEVICE_ONLY)) || defined(__DOXYGEN__)
 298                                 /** Indicates the mode that the USB interface is currently initialized to, a value from the
 299                                  *  \ref USB_Modes_t enum.
 300                                  *
 301                                  *  \note This variable should be treated as read-only in the user application, and never manually
 302                                  *        changed in value.
 303                                  *        \n\n
 304                                  *
 305                                  *  \note When the controller is initialized into UID auto-detection mode, this variable will hold the
 306                                  *        currently selected USB mode (i.e. \ref USB_MODE_Device or \ref USB_MODE_Host). If the controller
 307                                  *        is fixed into a specific mode (either through the \c USB_DEVICE_ONLY or \c USB_HOST_ONLY compile time
 308                                  *        options, or a limitation of the USB controller in the chosen device model) this will evaluate to
 309                                  *        a constant of the appropriate value and will never evaluate to \ref USB_MODE_None even when the
 310                                  *        USB interface is not initialized.
 311                                  */
 312                                 extern volatile uint8_t USB_CurrentMode;
 313                         #elif defined(USB_HOST_ONLY)
 314                                 #define USB_CurrentMode USB_MODE_Host
 315                         #elif defined(USB_DEVICE_ONLY)
 316                                 #define USB_CurrentMode USB_MODE_Device
 317                         #endif
 318
 319                         #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 320                                 /** Indicates the current USB options that the USB interface was initialized with when \ref USB_Init()
 321                                  *  was called. This value will be one of the \c USB_MODE_* masks defined elsewhere in this module.
 322                                  *
 323                                  *  \note This variable should be treated as read-only in the user application, and never manually
 324                                  *        changed in value.
 325                                  */
 326                                 extern volatile uint8_t USB_Options;
 327                         #elif defined(USE_STATIC_OPTIONS)
 328                                 #define USB_Options USE_STATIC_OPTIONS
 329                         #endif
 330
 331                 /* Enums: */
 332                         /** Enum for the possible USB controller modes, for initialization via \ref USB_Init() and indication back to the
 333                          *  user application via \ref USB_CurrentMode.
 334                          */
 335                         enum USB_Modes_t
 336                         {
 337                                 USB_MODE_None   = 0, /**< Indicates that the controller is currently not initialized in any specific USB mode. */
 338                                 USB_MODE_Device = 1, /**< Indicates that the controller is currently initialized in USB Device mode. */
 339                                 USB_MODE_Host   = 2, /**< Indicates that the controller is currently initialized in USB Host mode. */
 340                                 USB_MODE_UID    = 3, /**< Indicates that the controller should determine the USB mode from the UID pin of the
 341                                                       *   USB connector.
 342                                                       */
 343                         };
 344
 345         /* Private Interface - For use in library only: */
 346         #if !defined(__DOXYGEN__)
 347                 /* Function Prototypes: */
 348                         #if defined(__INCLUDE_FROM_USB_CONTROLLER_C)
 349                                 #if defined(USB_CAN_BE_DEVICE)
 350                                 static void USB_Init_Device(void);
 351                                 #endif
 352
 353                                 #if defined(USB_CAN_BE_HOST)
 354                                 static void USB_Init_Host(void);
 355                                 #endif
 356                         #endif
 357
 358                 /* Inline Functions: */
 359                         static inline void USB_PLL_On(void) ATTR_ALWAYS_INLINE;
 360                         static inline void USB_PLL_On(void)
 361                         {
 362                                 PLLCSR = USB_PLL_PSC;
 363                                 PLLCSR = (USB_PLL_PSC | (1 << PLLE));
 364                         }
 365
 366                         static inline void USB_PLL_Off(void) ATTR_ALWAYS_INLINE;
 367                         static inline void USB_PLL_Off(void)
 368                         {
 369                                 PLLCSR = 0;
 370                         }
 371
 372                         static inline bool USB_PLL_IsReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 373                         static inline bool USB_PLL_IsReady(void)
 374                         {
 375                                 return ((PLLCSR & (1 << PLOCK)) ? true : false);
 376                         }
 377
 378                         static inline void USB_REG_On(void) ATTR_ALWAYS_INLINE;
 379                         static inline void USB_REG_On(void)
 380                         {
 381                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 382                                 UHWCON  |=  (1 << UVREGE);
 383                         #else
 384                                 REGCR   &= ~(1 << REGDIS);
 385                         #endif
 386                         }
 387
 388                         static inline void USB_REG_Off(void) ATTR_ALWAYS_INLINE;
 389                         static inline void USB_REG_Off(void)
 390                         {
 391                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 392                                 UHWCON  &= ~(1 << UVREGE);
 393                         #else
 394                                 REGCR   |=  (1 << REGDIS);
 395                         #endif
 396                         }
 397
 398                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 399                         static inline void USB_OTGPAD_On(void) ATTR_ALWAYS_INLINE;
 400                         static inline void USB_OTGPAD_On(void)
 401                         {
 402                                 USBCON  |=  (1 << OTGPADE);
 403                         }
 404
 405                         static inline void USB_OTGPAD_Off(void) ATTR_ALWAYS_INLINE;
 406                         static inline void USB_OTGPAD_Off(void)
 407                         {
 408                                 USBCON  &= ~(1 << OTGPADE);
 409                         }
 410                         #endif
 411
 412                         static inline void USB_CLK_Freeze(void) ATTR_ALWAYS_INLINE;
 413                         static inline void USB_CLK_Freeze(void)
 414                         {
 415                                 USBCON  |=  (1 << FRZCLK);
 416                         }
 417
 418                         static inline void USB_CLK_Unfreeze(void) ATTR_ALWAYS_INLINE;
 419                         static inline void USB_CLK_Unfreeze(void)
 420                         {
 421                                 USBCON  &= ~(1 << FRZCLK);
 422                         }
 423
 424                         static inline void USB_Controller_Enable(void) ATTR_ALWAYS_INLINE;
 425                         static inline void USB_Controller_Enable(void)
 426                         {
 427                                 USBCON  |=  (1 << USBE);
 428                         }
 429
 430                         static inline void USB_Controller_Disable(void) ATTR_ALWAYS_INLINE;
 431                         static inline void USB_Controller_Disable(void)
 432                         {
 433                                 USBCON  &= ~(1 << USBE);
 434                         }
 435
 436                         static inline void USB_Controller_Reset(void) ATTR_ALWAYS_INLINE;
 437                         static inline void USB_Controller_Reset(void)
 438                         {
 439                                 USBCON &= ~(1 << USBE);
 440                                 USBCON |=  (1 << USBE);
 441                         }
 442
 443                         #if defined(USB_CAN_BE_BOTH)
 444                         static inline uint8_t USB_GetUSBModeFromUID(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 445                         static inline uint8_t USB_GetUSBModeFromUID(void)
 446                         {
 447                                 if (USBSTA & (1 << ID))
 448                                   return USB_MODE_Device;
 449                                 else
 450                                   return USB_MODE_Host;
 451                         }
 452                         #endif
 453
 454         #endif
 455
 456         /* Disable C linkage for C++ Compilers: */
 457                 #if defined(__cplusplus)
 458                         }
 459                 #endif
 460
 461 #endif
 462
 463 /** @} */
 464