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                         #if !defined(USB_STREAM_TIMEOUT_MS) || defined(__DOXYGEN__)
 150                                 /** Constant for the maximum software timeout period of the USB data stream transfer functions
 151                                  *  (both control and standard) when in either device or host mode. If the next packet of a stream
 152                                  *  is not received or acknowledged within this time period, the stream function will fail.
 153                                  *
 154                                  *  This value may be overridden in the user project makefile as the value of the
 155                                  *  \ref USB_STREAM_TIMEOUT_MS token, and passed to the compiler using the -D switch.
 156                                  */
 157                                 #define USB_STREAM_TIMEOUT_MS       100
 158                         #endif
 159
 160                 /* Inline Functions: */
 161                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR) || defined(__DOXYGEN__)
 162                                 /** Determines if the VBUS line is currently high (i.e. the USB host is supplying power).
 163                                  *
 164                                  *  \note This function is not available on some AVR models which do not support hardware VBUS monitoring.
 165                                  *
 166                                  *  \return Boolean \c true if the VBUS line is currently detecting power from a host, \c false otherwise.
 167                                  */
 168                                 static inline bool USB_VBUS_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 169                                 static inline bool USB_VBUS_GetStatus(void)
 170                                 {
 171                                         return ((USBSTA & (1 << VBUS)) ? true : false);
 172                                 }
 173                         #endif
 174
 175                         /** Detaches the device from the USB bus. This has the effect of removing the device from any
 176                          *  attached host, ceasing USB communications. If no host is present, this prevents any host from
 177                          *  enumerating the device once attached until \ref USB_Attach() is called.
 178                          */
 179                         static inline void USB_Detach(void) ATTR_ALWAYS_INLINE;
 180                         static inline void USB_Detach(void)
 181                         {
 182                                 UDCON  |=  (1 << DETACH);
 183                         }
 184
 185                         /** Attaches the device to the USB bus. This announces the device's presence to any attached
 186                          *  USB host, starting the enumeration process. If no host is present, attaching the device
 187                          *  will allow for enumeration once a host is connected to the device.
 188                          *
 189                          *  This is inexplicably also required for proper operation while in host mode, to enable the
 190                          *  attachment of a device to the host. This is despite the bit being located in the device-mode
 191                          *  register and despite the datasheet making no mention of its requirement in host mode.
 192                          */
 193                         static inline void USB_Attach(void) ATTR_ALWAYS_INLINE;
 194                         static inline void USB_Attach(void)
 195                         {
 196                                 UDCON  &= ~(1 << DETACH);
 197                         }
 198
 199                 /* Function Prototypes: */
 200                         /** Main function to initialize and start the USB interface. Once active, the USB interface will
 201                          *  allow for device connection to a host when in device mode, or for device enumeration while in
 202                          *  host mode.
 203                          *
 204                          *  As the USB library relies on interrupts for the device and host mode enumeration processes,
 205                          *  the user must enable global interrupts before or shortly after this function is called. In
 206                          *  device mode, interrupts must be enabled within 500ms of this function being called to ensure
 207                          *  that the host does not time out whilst enumerating the device. In host mode, interrupts may be
 208                          *  enabled at the application's leisure however enumeration will not begin of an attached device
 209                          *  until after this has occurred.
 210                          *
 211                          *  Calling this function when the USB interface is already initialized will cause a complete USB
 212                          *  interface reset and re-enumeration.
 213                          *
 214                          *  \param[in] Mode     This is a mask indicating what mode the USB interface is to be initialized to, a value
 215                          *                      from the \ref USB_Modes_t enum.
 216                          *
 217                          *  \param[in] Options  Mask indicating the options which should be used when initializing the USB
 218                          *                      interface to control the USB interface's behaviour. This should be comprised of
 219                          *                      a \c USB_OPT_REG_* mask to control the regulator, a \c USB_OPT_*_PLL mask to control the
 220                          *                      PLL, and a \c USB_DEVICE_OPT_* mask (when the device mode is enabled) to set the device
 221                          *                      mode speed.
 222                          *
 223                          *  \note To reduce the FLASH requirements of the library if only device or host mode is required,
 224                          *        the mode can be statically set in the project makefile by defining the token \c USB_DEVICE_ONLY
 225                          *        (for device mode) or \c USB_HOST_ONLY (for host mode), passing the token to the compiler
 226                          *        via the -D switch. If the mode is statically set, this parameter does not exist in the
 227                          *        function prototype.
 228                          *        \n\n
 229                          *
 230                          *  \note To reduce the FLASH requirements of the library if only fixed settings are are required,
 231                          *        the options may be set statically in the same manner as the mode (see the Mode parameter of
 232                          *        this function). To statically set the USB options, pass in the \c USE_STATIC_OPTIONS token,
 233                          *        defined to the appropriate options masks. When the options are statically set, this
 234                          *        parameter does not exist in the function prototype.
 235                          *        \n\n
 236                          *
 237                          *  \note The mode parameter does not exist on devices where only one mode is possible, such as USB
 238                          *        AVR models which only implement the USB device mode in hardware.
 239                          *
 240                          *  \see \ref Group_Device for the \c USB_DEVICE_OPT_* masks.
 241                          */
 242                         void USB_Init(
 243                                        #if defined(USB_CAN_BE_BOTH) || defined(__DOXYGEN__)
 244                                        const uint8_t Mode
 245                                        #endif
 246
 247                                        #if (defined(USB_CAN_BE_BOTH) && !defined(USE_STATIC_OPTIONS)) || defined(__DOXYGEN__)
 248                                        ,
 249                                        #elif (!defined(USB_CAN_BE_BOTH) && defined(USE_STATIC_OPTIONS))
 250                                        void
 251                                        #endif
 252
 253                                        #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 254                                        const uint8_t Options
 255                                        #endif
 256                                        );
 257
 258                         /** Shuts down the USB interface. This turns off the USB interface after deallocating all USB FIFO
 259                          *  memory, endpoints and pipes. When turned off, no USB functionality can be used until the interface
 260                          *  is restarted with the \ref USB_Init() function.
 261                          */
 262                         void USB_Disable(void);
 263
 264                         /** Resets the interface, when already initialized. This will re-enumerate the device if already connected
 265                          *  to a host, or re-enumerate an already attached device when in host mode.
 266                          */
 267                         void USB_ResetInterface(void);
 268
 269                 /* Global Variables: */
 270                         #if (!defined(USB_HOST_ONLY) && !defined(USB_DEVICE_ONLY)) || defined(__DOXYGEN__)
 271                                 /** Indicates the mode that the USB interface is currently initialized to, a value from the
 272                                  *  \ref USB_Modes_t enum.
 273                                  *
 274                                  *  \note This variable should be treated as read-only in the user application, and never manually
 275                                  *        changed in value.
 276                                  *        \n\n
 277                                  *
 278                                  *  \note When the controller is initialized into UID auto-detection mode, this variable will hold the
 279                                  *        currently selected USB mode (i.e. \ref USB_MODE_Device or \ref USB_MODE_Host). If the controller
 280                                  *        is fixed into a specific mode (either through the \c USB_DEVICE_ONLY or \c USB_HOST_ONLY compile time
 281                                  *        options, or a limitation of the USB controller in the chosen device model) this will evaluate to
 282                                  *        a constant of the appropriate value and will never evaluate to \ref USB_MODE_None even when the
 283                                  *        USB interface is not initialized.
 284                                  */
 285                                 extern volatile uint8_t USB_CurrentMode;
 286                         #elif defined(USB_HOST_ONLY)
 287                                 #define USB_CurrentMode USB_MODE_Host
 288                         #elif defined(USB_DEVICE_ONLY)
 289                                 #define USB_CurrentMode USB_MODE_Device
 290                         #endif
 291
 292                         #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 293                                 /** Indicates the current USB options that the USB interface was initialized with when \ref USB_Init()
 294                                  *  was called. This value will be one of the \c USB_MODE_* masks defined elsewhere in this module.
 295                                  *
 296                                  *  \note This variable should be treated as read-only in the user application, and never manually
 297                                  *        changed in value.
 298                                  */
 299                                 extern volatile uint8_t USB_Options;
 300                         #elif defined(USE_STATIC_OPTIONS)
 301                                 #define USB_Options USE_STATIC_OPTIONS
 302                         #endif
 303
 304                 /* Enums: */
 305                         /** Enum for the possible USB controller modes, for initialization via \ref USB_Init() and indication back to the
 306                          *  user application via \ref USB_CurrentMode.
 307                          */
 308                         enum USB_Modes_t
 309                         {
 310                                 USB_MODE_None   = 0, /**< Indicates that the controller is currently not initialized in any specific USB mode. */
 311                                 USB_MODE_Device = 1, /**< Indicates that the controller is currently initialized in USB Device mode. */
 312                                 USB_MODE_Host   = 2, /**< Indicates that the controller is currently initialized in USB Host mode. */
 313                                 USB_MODE_UID    = 3, /**< Indicates that the controller should determine the USB mode from the UID pin of the
 314                                                       *   USB connector.
 315                                                       */
 316                         };
 317
 318         /* Private Interface - For use in library only: */
 319         #if !defined(__DOXYGEN__)
 320                 /* Function Prototypes: */
 321                         #if defined(__INCLUDE_FROM_USB_CONTROLLER_C)
 322                                 #if defined(USB_CAN_BE_DEVICE)
 323                                 static void USB_Init_Device(void);
 324                                 #endif
 325
 326                                 #if defined(USB_CAN_BE_HOST)
 327                                 static void USB_Init_Host(void);
 328                                 #endif
 329                         #endif
 330
 331                 /* Inline Functions: */
 332                         static inline void USB_PLL_On(void) ATTR_ALWAYS_INLINE;
 333                         static inline void USB_PLL_On(void)
 334                         {
 335                                 PLLCSR = USB_PLL_PSC;
 336                                 PLLCSR = (USB_PLL_PSC | (1 << PLLE));
 337                         }
 338
 339                         static inline void USB_PLL_Off(void) ATTR_ALWAYS_INLINE;
 340                         static inline void USB_PLL_Off(void)
 341                         {
 342                                 PLLCSR = 0;
 343                         }
 344
 345                         static inline bool USB_PLL_IsReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 346                         static inline bool USB_PLL_IsReady(void)
 347                         {
 348                                 return ((PLLCSR & (1 << PLOCK)) ? true : false);
 349                         }
 350
 351                         static inline void USB_REG_On(void) ATTR_ALWAYS_INLINE;
 352                         static inline void USB_REG_On(void)
 353                         {
 354                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 355                                 UHWCON  |=  (1 << UVREGE);
 356                         #else
 357                                 REGCR   &= ~(1 << REGDIS);
 358                         #endif
 359                         }
 360
 361                         static inline void USB_REG_Off(void) ATTR_ALWAYS_INLINE;
 362                         static inline void USB_REG_Off(void)
 363                         {
 364                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 365                                 UHWCON  &= ~(1 << UVREGE);
 366                         #else
 367                                 REGCR   |=  (1 << REGDIS);
 368                         #endif
 369                         }
 370
 371                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 372                         static inline void USB_OTGPAD_On(void) ATTR_ALWAYS_INLINE;
 373                         static inline void USB_OTGPAD_On(void)
 374                         {
 375                                 USBCON  |=  (1 << OTGPADE);
 376                         }
 377
 378                         static inline void USB_OTGPAD_Off(void) ATTR_ALWAYS_INLINE;
 379                         static inline void USB_OTGPAD_Off(void)
 380                         {
 381                                 USBCON  &= ~(1 << OTGPADE);
 382                         }
 383                         #endif
 384
 385                         static inline void USB_CLK_Freeze(void) ATTR_ALWAYS_INLINE;
 386                         static inline void USB_CLK_Freeze(void)
 387                         {
 388                                 USBCON  |=  (1 << FRZCLK);
 389                         }
 390
 391                         static inline void USB_CLK_Unfreeze(void) ATTR_ALWAYS_INLINE;
 392                         static inline void USB_CLK_Unfreeze(void)
 393                         {
 394                                 USBCON  &= ~(1 << FRZCLK);
 395                         }
 396
 397                         static inline void USB_Controller_Enable(void) ATTR_ALWAYS_INLINE;
 398                         static inline void USB_Controller_Enable(void)
 399                         {
 400                                 USBCON  |=  (1 << USBE);
 401                         }
 402
 403                         static inline void USB_Controller_Disable(void) ATTR_ALWAYS_INLINE;
 404                         static inline void USB_Controller_Disable(void)
 405                         {
 406                                 USBCON  &= ~(1 << USBE);
 407                         }
 408
 409                         static inline void USB_Controller_Reset(void) ATTR_ALWAYS_INLINE;
 410                         static inline void USB_Controller_Reset(void)
 411                         {
 412                                 USBCON &= ~(1 << USBE);
 413                                 USBCON |=  (1 << USBE);
 414                         }
 415
 416                         #if defined(USB_CAN_BE_BOTH)
 417                         static inline uint8_t USB_GetUSBModeFromUID(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 418                         static inline uint8_t USB_GetUSBModeFromUID(void)
 419                         {
 420                                 if (USBSTA & (1 << ID))
 421                                   return USB_MODE_Device;
 422                                 else
 423                                   return USB_MODE_Host;
 424                         }
 425                         #endif
 426
 427         #endif
 428
 429         /* Disable C linkage for C++ Compilers: */
 430                 #if defined(__cplusplus)
 431                         }
 432                 #endif
 433
 434 #endif
 435
 436 /** @} */
 437