LUFA/Drivers/USB/LowLevel/USBController.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2010  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 low level USB controller definitions.
  33  *
  34  *  This file contains structures, function prototypes and macros related to the low level configuration of the
  35  *  USB controller, to start, stop and reset the USB library core.
  36  *
  37  *  \note This file should not be included directly. It is automatically included as needed by the USB driver
  38  *        dispatch header located in LUFA/Drivers/USB/USB.h.
  39  */
  40
  41 /** \ingroup Group_USB
  42  *  @defgroup Group_USBManagement USB Interface Management
  43  *
  44  *  Functions, macros, variables, enums and types related to the setup and management of the USB interface.
  45  *
  46  *  @{
  47  */
  48
  49 #ifndef __USBCONTROLLER_H__
  50 #define __USBCONTROLLER_H__
  51
  52         /* Includes: */
  53                 #include <avr/io.h>
  54                 #include <avr/interrupt.h>
  55                 #include <stdbool.h>
  56
  57                 #include "../HighLevel/USBMode.h"
  58
  59                 #include "../../../Common/Common.h"
  60                 #include "../HighLevel/USBMode.h"
  61                 #include "../HighLevel/Events.h"
  62                 #include "../HighLevel/USBTask.h"
  63                 #include "USBInterrupt.h"
  64
  65                 #if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
  66                         #include "Host.h"
  67                         #include "OTG.h"
  68                         #include "Pipe.h"
  69                         #include "../HighLevel/HostStandardReq.h"
  70                         #include "../HighLevel/PipeStream.h"
  71                 #endif
  72
  73                 #if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
  74                         #include "Device.h"
  75                         #include "Endpoint.h"
  76                         #include "../HighLevel/DeviceStandardReq.h"
  77                         #include "../HighLevel/EndpointStream.h"
  78                 #endif
  79
  80         /* Enable C linkage for C++ Compilers: */
  81                 #if defined(__cplusplus)
  82                         extern "C" {
  83                 #endif
  84
  85         /* Preprocessor Checks and Defines: */
  86                 #if !defined(__INCLUDE_FROM_USB_DRIVER)
  87                         #error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
  88                 #endif
  89
  90                 #if !defined(F_CLOCK)
  91                         #error F_CLOCK is not defined. You must define F_CLOCK to the frequency of the unprescaled input clock in your project makefile.
  92                 #endif
  93
  94                 #if (F_CLOCK == 8000000)
  95                         #if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
  96                              defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || \
  97                              defined(__AVR_ATmega32U2__))
  98                                 #define USB_PLL_PSC                0
  99                         #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
 100                                 #define USB_PLL_PSC                0
 101                         #elif (defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB1286__) || defined(__AVR_ATmega32U6__))
 102                                 #define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
 103                         #elif (defined(__AVR_AT90USB647__)  || defined(__AVR_AT90USB1287__))
 104                                 #define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
 105                         #endif
 106                 #elif (F_CLOCK == 16000000)
 107                         #if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
 108                              defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || \
 109                              defined(__AVR_ATmega32U2__))
 110                                 #define USB_PLL_PSC                (1 << PLLP0)
 111                         #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
 112                                 #define USB_PLL_PSC                (1 << PINDIV)
 113                         #elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_ATmega32U6__))
 114                                 #define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP1))
 115                         #elif (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__))
 116                                 #define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP0))
 117                         #endif
 118                 #endif
 119
 120                 #if !defined(USB_PLL_PSC)
 121                         #error No PLL prescale value available for chosen F_CLOCK value and AVR model.
 122                 #endif
 123
 124         /* Public Interface - May be used in end-application: */
 125                 /* Macros: */
 126                         /** \name USB Controller Option Masks */
 127                         //@{
 128                         /** Regulator disable 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 to within the USB standard.
 130                          *
 131                          *  \note See USB AVR data sheet for more information on the internal pad regulator.
 132                          */
 133                         #define USB_OPT_REG_DISABLED               (1 << 1)
 134
 135                         /** Regulator enable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
 136                          *  regulator should be disabled and the AVR's VCC level used for the data pads.
 137                          *
 138                          *  \note See USB AVR data sheet for more information on the internal pad regulator.
 139                          */
 140                         #define USB_OPT_REG_ENABLED                (0 << 1)
 141
 142                         /** Manual PLL control option mask for \ref USB_Init(). This indicates to the library that the user application
 143                          *  will 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_MANUAL_PLL                 (1 << 2)
 147
 148                         /** Automatic PLL control option mask for \ref USB_Init(). This indicates to the library that the library should
 149                          *  take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
 150                          *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
 151                          */
 152                         #define USB_OPT_AUTO_PLL                   (0 << 2)
 153                         //@}
 154
 155                         /** \name Endpoint/Pipe Type Masks */
 156                         //@{
 157                         /** Mask for a CONTROL type endpoint or pipe.
 158                          *
 159                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 160                          */
 161                         #define EP_TYPE_CONTROL                    0x00
 162
 163                         /** Mask for an ISOCHRONOUS type endpoint or pipe.
 164                          *
 165                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 166                          */
 167                         #define EP_TYPE_ISOCHRONOUS                0x01
 168
 169                         /** Mask for a BULK type endpoint or pipe.
 170                          *
 171                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 172                          */
 173                         #define EP_TYPE_BULK                       0x02
 174
 175                         /** Mask for an INTERRUPT type endpoint or pipe.
 176                          *
 177                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 178                          */
 179                         #define EP_TYPE_INTERRUPT                  0x03
 180                         //@}
 181
 182                         #if !defined(USB_STREAM_TIMEOUT_MS) || defined(__DOXYGEN__)
 183                                 /** Constant for the maximum software timeout period of the USB data stream transfer functions
 184                                  *  (both control and standard) when in either device or host mode. If the next packet of a stream
 185                                  *  is not received or acknowledged within this time period, the stream function will fail.
 186                                  *
 187                                  *  This value may be overridden in the user project makefile as the value of the
 188                                  *  \ref USB_STREAM_TIMEOUT_MS token, and passed to the compiler using the -D switch.
 189                                  */
 190                                 #define USB_STREAM_TIMEOUT_MS       100
 191                         #endif
 192
 193                 /* Inline Functions: */
 194                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR) || defined(__DOXYGEN__)
 195                                 /** Returns boolean true if the VBUS line is currently high (i.e. the USB host is supplying power),
 196                                  *  otherwise returns false.
 197                                  *
 198                                  *  \note This function is not available on some AVR models which do not support hardware VBUS monitoring.
 199                                  */
 200                                 static inline bool USB_VBUS_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 201                                 static inline bool USB_VBUS_GetStatus(void)
 202                                 {
 203                                         return ((USBSTA & (1 << VBUS)) ? true : false);
 204                                 }
 205                         #endif
 206
 207                         /** Detaches the device from the USB bus. This has the effect of removing the device from any
 208                          *  attached host, ceasing USB communications. If no host is present, this prevents any host from
 209                          *  enumerating the device once attached until \ref USB_Attach() is called.
 210                          */
 211                         static inline void USB_Detach(void) ATTR_ALWAYS_INLINE;
 212                         static inline void USB_Detach(void)
 213                         {
 214                                 UDCON  |=  (1 << DETACH);
 215                         }
 216
 217                         /** Attaches the device to the USB bus. This announces the device's presence to any attached
 218                          *  USB host, starting the enumeration process. If no host is present, attaching the device
 219                          *  will allow for enumeration once a host is connected to the device.
 220                          *
 221                          *  This is inexplicably also required for proper operation while in host mode, to enable the
 222                          *  attachment of a device to the host. This is despite the bit being located in the device-mode
 223                          *  register and despite the datasheet making no mention of its requirement in host mode.
 224                          */
 225                         static inline void USB_Attach(void) ATTR_ALWAYS_INLINE;
 226                         static inline void USB_Attach(void)
 227                         {
 228                                 UDCON  &= ~(1 << DETACH);
 229                         }
 230
 231                 /* Function Prototypes: */
 232                         /** Main function to initialize and start the USB interface. Once active, the USB interface will
 233                          *  allow for device connection to a host when in device mode, or for device enumeration while in
 234                          *  host mode.
 235                          *
 236                          *  As the USB library relies on interrupts for the device and host mode enumeration processes,
 237                          *  the user must enable global interrupts before or shortly after this function is called. In
 238                          *  device mode, interrupts must be enabled within 500ms of this function being called to ensure
 239                          *  that the host does not time out whilst enumerating the device. In host mode, interrupts may be
 240                          *  enabled at the application's leisure however enumeration will not begin of an attached device
 241                          *  until after this has occurred.
 242                          *
 243                          *  Calling this function when the USB interface is already initialized will cause a complete USB
 244                          *  interface reset and re-enumeration.
 245                          *
 246                          *  \param[in] Mode     This is a mask indicating what mode the USB interface is to be initialized to, a value
 247                          *                      from the \ref USB_Modes_t enum.
 248                          *
 249                          *  \param[in] Options  Mask indicating the options which should be used when initializing the USB
 250                          *                      interface to control the USB interface's behaviour. This should be comprised of
 251                          *                      a USB_OPT_REG_* mask to control the regulator, a USB_OPT_*_PLL mask to control the
 252                          *                      PLL, and a USB_DEVICE_OPT_* mask (when the device mode is enabled) to set the device
 253                          *                      mode speed.
 254                          *
 255                          *  \note To reduce the FLASH requirements of the library if only device or host mode is required,
 256                          *        the mode can be statically set in the project makefile by defining the token USB_DEVICE_ONLY
 257                          *        (for device mode) or USB_HOST_ONLY (for host mode), passing the token to the compiler
 258                          *        via the -D switch. If the mode is statically set, this parameter does not exist in the
 259                          *        function prototype.
 260                          *        \n\n
 261                          *
 262                          *  \note To reduce the FLASH requirements of the library if only fixed settings are are required,
 263                          *        the options may be set statically in the same manner as the mode (see the Mode parameter of
 264                          *        this function). To statically set the USB options, pass in the USE_STATIC_OPTIONS token,
 265                          *        defined to the appropriate options masks. When the options are statically set, this
 266                          *        parameter does not exist in the function prototype.
 267                          *        \n\n
 268                          *
 269                          *  \note The mode parameter does not exist on devices where only one mode is possible, such as USB
 270                          *        AVR models which only implement the USB device mode in hardware.
 271                          *
 272                          *  \see Device.h for the USB_DEVICE_OPT_* masks.
 273                          */
 274                         void USB_Init(
 275                                        #if defined(USB_CAN_BE_BOTH) || defined(__DOXYGEN__)
 276                                        const uint8_t Mode
 277                                        #endif
 278
 279                                        #if (defined(USB_CAN_BE_BOTH) && !defined(USE_STATIC_OPTIONS)) || defined(__DOXYGEN__)
 280                                        ,
 281                                        #elif (!defined(USB_CAN_BE_BOTH) && defined(USE_STATIC_OPTIONS))
 282                                        void
 283                                        #endif
 284
 285                                        #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 286                                        const uint8_t Options
 287                                        #endif
 288                                        );
 289
 290                         /** Shuts down the USB interface. This turns off the USB interface after deallocating all USB FIFO
 291                          *  memory, endpoints and pipes. When turned off, no USB functionality can be used until the interface
 292                          *  is restarted with the \ref USB_Init() function.
 293                          */
 294                         void USB_ShutDown(void);
 295
 296                         /** Resets the interface, when already initialized. This will re-enumerate the device if already connected
 297                          *  to a host, or re-enumerate an already attached device when in host mode.
 298                          */
 299                         void USB_ResetInterface(void);
 300
 301                 /* Global Variables: */
 302                         #if (!defined(USB_HOST_ONLY) && !defined(USB_DEVICE_ONLY)) || defined(__DOXYGEN__)
 303                                 /** Indicates the mode that the USB interface is currently initialized to, a value from the
 304                                  *  \ref USB_Modes_t enum.
 305                                  *
 306                                  *  \note This variable should be treated as read-only in the user application, and never manually
 307                                  *        changed in value.
 308                                  *        \n\n
 309                                  *
 310                                  *  \note When the controller is initialized into UID autodetection mode, this variable will hold the
 311                                  *        currently selected USB mode (i.e. \ref USB_MODE_Device or \ref USB_MODE_Host). If the controller
 312                                  *        is fixed into a specific mode (either through the USB_DEVICE_ONLY or USB_HOST_ONLY compile time
 313                                  *        options, or a limitation of the USB controller in the chosen device model) this will evaluate to
 314                                  *        a constant of the appropriate value and will never evaluate to \ref USB_MODE_None even when the
 315                                  *        USB interface is not initialized.
 316                                  */
 317                                 extern volatile uint8_t USB_CurrentMode;
 318                         #elif defined(USB_HOST_ONLY)
 319                                 #define USB_CurrentMode USB_MODE_Host
 320                         #elif defined(USB_DEVICE_ONLY)
 321                                 #define USB_CurrentMode USB_MODE_Device
 322                         #endif
 323
 324                         #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 325                                 /** Indicates the current USB options that the USB interface was initialized with when \ref USB_Init()
 326                                  *  was called. This value will be one of the USB_MODE_* masks defined elsewhere in this module.
 327                                  *
 328                                  *  \note This variable should be treated as read-only in the user application, and never manually
 329                                  *        changed in value.
 330                                  */
 331                                 extern volatile uint8_t USB_Options;
 332                         #elif defined(USE_STATIC_OPTIONS)
 333                                 #define USB_Options USE_STATIC_OPTIONS
 334                         #endif
 335
 336                 /* Enums: */
 337                         /** Enum for the possible USB controller modes, for initialization via \ref USB_Init() and indication back to the
 338                          *  user application via \ref USB_CurrentMode.
 339                          */
 340                         enum USB_Modes_t
 341                         {
 342                                 USB_MODE_None   = 0, /**< Indicates that the controller is currently not initialized in any specific USB mode. */
 343                                 USB_MODE_Device = 1, /**< Indicates that the controller is currently initialized in USB Device mode. */
 344                                 USB_MODE_Host   = 2, /**< Indicates that the controller is currently initialized in USB Host mode. */
 345                                 USB_MODE_UID    = 3, /**< Indicates that the controller should determine the USB mode from the UID pin of the
 346                                                       *   USB connector.
 347                                                       */
 348                         };
 349
 350         /* Private Interface - For use in library only: */
 351         #if !defined(__DOXYGEN__)
 352                 /* Function Prototypes: */
 353                         #if defined(__INCLUDE_FROM_USB_CONTROLLER_C)
 354                                 #if defined(USB_CAN_BE_DEVICE)
 355                                 static void USB_Init_Device(void);
 356                                 #endif
 357
 358                                 #if defined(USB_CAN_BE_HOST)
 359                                 static void USB_Init_Host(void);
 360                                 #endif
 361                         #endif
 362
 363                 /* Inline Functions: */
 364                         static inline void USB_PLL_On(void) ATTR_ALWAYS_INLINE;
 365                         static inline void USB_PLL_On(void)
 366                         {
 367                                 PLLCSR  = USB_PLL_PSC;
 368                                 PLLCSR |= (1 << PLLE);
 369                         }
 370
 371                         static inline void USB_PLL_Off(void) ATTR_ALWAYS_INLINE;
 372                         static inline void USB_PLL_Off(void)
 373                         {
 374                                 PLLCSR  = 0;
 375                         }
 376
 377                         static inline bool USB_PLL_IsReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 378                         static inline bool USB_PLL_IsReady(void)
 379                         {
 380                                 return ((PLLCSR  &   (1 << PLOCK)) ? true : false);
 381                         }
 382
 383                         static inline void USB_REG_On(void) ATTR_ALWAYS_INLINE;
 384                         static inline void USB_REG_On(void)
 385                         {
 386                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 387                                 UHWCON  |=  (1 << UVREGE);
 388                         #else
 389                                 REGCR   &= ~(1 << REGDIS);
 390                         #endif
 391                         }
 392
 393                         static inline void USB_REG_Off(void) ATTR_ALWAYS_INLINE;
 394                         static inline void USB_REG_Off(void)
 395                         {
 396                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 397                                 UHWCON  &= ~(1 << UVREGE);
 398                         #else
 399                                 REGCR   |=  (1 << REGDIS);
 400                         #endif
 401                         }
 402
 403                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 404                         static inline void USB_OTGPAD_On(void) ATTR_ALWAYS_INLINE;
 405                         static inline void USB_OTGPAD_On(void)
 406                         {
 407                                 USBCON  |=  (1 << OTGPADE);
 408                         }
 409
 410                         static inline void USB_OTGPAD_Off(void) ATTR_ALWAYS_INLINE;
 411                         static inline void USB_OTGPAD_Off(void)
 412                         {
 413                                 USBCON  &= ~(1 << OTGPADE);
 414                         }
 415                         #endif
 416
 417                         static inline void USB_CLK_Freeze(void) ATTR_ALWAYS_INLINE;
 418                         static inline void USB_CLK_Freeze(void)
 419                         {
 420                                 USBCON  |=  (1 << FRZCLK);
 421                         }
 422
 423                         static inline void USB_CLK_Unfreeze(void) ATTR_ALWAYS_INLINE;
 424                         static inline void USB_CLK_Unfreeze(void)
 425                         {
 426                                 USBCON  &= ~(1 << FRZCLK);
 427                         }
 428
 429                         static inline void USB_Controller_Enable(void) ATTR_ALWAYS_INLINE;
 430                         static inline void USB_Controller_Enable(void)
 431                         {
 432                                 USBCON  |=  (1 << USBE);
 433                         }
 434
 435                         static inline void USB_Controller_Disable(void) ATTR_ALWAYS_INLINE;
 436                         static inline void USB_Controller_Disable(void)
 437                         {
 438                                 USBCON  &= ~(1 << USBE);
 439                         }
 440
 441                         static inline void USB_Controller_Reset(void) ATTR_ALWAYS_INLINE;
 442                         static inline void USB_Controller_Reset(void)
 443                         {
 444                                 const uint8_t Temp = USBCON;
 445
 446                                 USBCON = (Temp & ~(1 << USBE));
 447                                 USBCON = (Temp |  (1 << USBE));
 448                         }
 449
 450                         #if defined(USB_CAN_BE_BOTH)
 451                         static inline uint8_t USB_GetUSBModeFromUID(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 452                         static inline uint8_t USB_GetUSBModeFromUID(void)
 453                         {
 454                                 if (USBSTA & (1 << ID))
 455                                   return USB_MODE_Device;
 456                                 else
 457                                   return USB_MODE_Host;
 458                         }
 459                         #endif
 460
 461         #endif
 462
 463         /* Disable C linkage for C++ Compilers: */
 464                 #if defined(__cplusplus)
 465                         }
 466                 #endif
 467
 468 #endif
 469
 470 /** @} */
 471