LUFA/Drivers/USB/LowLevel/LowLevel.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   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 /** \ingroup Group_USB
  32  *  @defgroup Group_USBManagement USB Interface Management
  33  *
  34  *  Functions, macros, variables, enums and types related to the setup and management of the USB interface.
  35  *
  36  *  @{
  37  */
  38
  39 #ifndef __USBLOWLEVEL_H__
  40 #define __USBLOWLEVEL_H__
  41
  42         /* Includes: */
  43                 #include <avr/io.h>
  44                 #include <avr/interrupt.h>
  45                 #include <stdbool.h>
  46
  47                 #include "../HighLevel/USBMode.h"
  48
  49                 #include "../../../Common/Common.h"
  50                 #include "../HighLevel/USBMode.h"
  51                 #include "../HighLevel/Events.h"
  52                 #include "../HighLevel/USBTask.h"
  53                 #include "../HighLevel/USBInterrupt.h"
  54
  55                 #if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
  56                         #include "Host.h"
  57                         #include "Pipe.h"
  58                         #include "OTG.h"
  59                 #endif
  60
  61                 #if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
  62                         #include "Device.h"
  63                         #include "Endpoint.h"
  64                         #include "DevChapter9.h"
  65                 #endif
  66
  67         /* Enable C linkage for C++ Compilers: */
  68                 #if defined(__cplusplus)
  69                         extern "C" {
  70                 #endif
  71
  72         /* Preprocessor Checks and Defines: */
  73                 #if !defined(F_CLOCK)
  74                         #error F_CLOCK is not defined. You must define F_CLOCK to the frequency of the unprescaled input clock in your project makefile.
  75                 #endif
  76
  77                 #if (F_CLOCK == 8000000)
  78                         #if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
  79                              defined(__AVR_ATMEGA8U2__) || defined(__AVR_ATMEGA16U2__))
  80                                 #define USB_PLL_PSC                0
  81                         #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
  82                                 #define USB_PLL_PSC                0
  83                         #elif (defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB1286__) || defined(__AVR_ATmega32U6__))
  84                                 #define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
  85                         #elif (defined(__AVR_AT90USB647__)  || defined(__AVR_AT90USB1287__))
  86                                 #define USB_PLL_PSC                ((1 << PLLP1) | (1 << PLLP0))
  87                         #endif
  88                 #elif (F_CLOCK == 16000000)
  89                         #if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || \
  90                              defined(__AVR_ATMEGA8U2__) || defined(__AVR_ATMEGA16U2__))
  91                                 #define USB_PLL_PSC                (1 << PLLP0)
  92                         #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
  93                                 #define USB_PLL_PSC                (1 << PINDIV)
  94                         #elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_ATmega32U6__))
  95                                 #define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP1))
  96                         #elif (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__))
  97                                 #define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP0))
  98                         #endif
  99                 #endif
 100
 101                 #if !defined(USB_PLL_PSC)
 102                         #error No PLL prescale value available for chosen F_CPU value and AVR model.
 103                 #endif
 104
 105         /* Public Interface - May be used in end-application: */
 106                 /* Macros: */
 107                         /** Mode mask for the \ref USB_CurrentMode global. This indicates that the USB interface is currently not
 108                          *  initialized into any mode.
 109                          */
 110                         #define USB_MODE_NONE                      0
 111
 112                         /** Mode mask for the \ref USB_CurrentMode global and the \ref USB_Init() function. This indicates that the
 113                          *  USB interface is or should be initialized in the USB device mode.
 114                          */
 115                         #define USB_MODE_DEVICE                    1
 116
 117                         /** Mode mask for the \ref USB_CurrentMode global and the \ref USB_Init() function. This indicates that the
 118                          *  USB interface is or should be initialized in the USB host mode.
 119                          */
 120                         #define USB_MODE_HOST                      2
 121
 122                         #if defined(USB_CAN_BE_BOTH) || defined(__DOXYGEN__)
 123                                 /** Mode mask for the the \ref USB_Init() function. This indicates that the USB interface should be
 124                                  *  initialized into whatever mode the UID pin of the USB AVR indicates, and that the device
 125                                  *  should swap over its mode when the level of the UID pin changes during operation.
 126                                  *
 127                                  *  \note This token is not available on AVR models which do not support both host and device modes.
 128                                  */
 129                                 #define USB_MODE_UID                       3
 130                         #endif
 131
 132                         /** Regulator disable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
 133                          *  regulator should be enabled to regulate the data pin voltages to within the USB standard.
 134                          *
 135                          *  \note See USB AVR data sheet for more information on the internal pad regulator.
 136                          */
 137                         #define USB_OPT_REG_DISABLED               (1 << 1)
 138
 139                         /** Regulator enable option mask for \ref USB_Init(). This indicates that the internal 3.3V USB data pad
 140                          *  regulator should be disabled and the AVR's VCC level used for the data pads.
 141                          *
 142                          *  \note See USB AVR data sheet for more information on the internal pad regulator.
 143                          */
 144                         #define USB_OPT_REG_ENABLED                (0 << 1)
 145
 146                         /** Manual PLL control option mask for \ref USB_Init(). This indicates to the library that the user application
 147                          *  will take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
 148                          *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
 149                          */
 150                         #define USB_OPT_MANUAL_PLL                 (1 << 2)
 151
 152                         /** Automatic PLL control option mask for \ref USB_Init(). This indicates to the library that the library should
 153                          *  take full responsibility for controlling the AVR's PLL (used to generate the high frequency clock
 154                          *  that the USB controller requires) and ensuring that it is locked at the correct frequency for USB operations.
 155                          */
 156                         #define USB_OPT_AUTO_PLL                   (0 << 2)
 157
 158                         /** Mask for a CONTROL type endpoint or pipe.
 159                          *
 160                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 161                          */
 162                         #define EP_TYPE_CONTROL                    0x00
 163
 164                         /** Mask for an ISOCHRONOUS type endpoint or pipe.
 165                          *
 166                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 167                          */
 168                         #define EP_TYPE_ISOCHRONOUS                0x01
 169
 170                         /** Mask for a BULK type endpoint or pipe.
 171                          *
 172                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 173                          */
 174                         #define EP_TYPE_BULK                       0x02
 175
 176                         /** Mask for an INTERRUPT type endpoint or pipe.
 177                          *
 178                          *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for endpoint/pipe functions.
 179                          */
 180                         #define EP_TYPE_INTERRUPT                  0x03
 181
 182                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR) || defined(__DOXYGEN__)
 183                                 /** Returns boolean true if the VBUS line is currently high (i.e. the USB host is supplying power),
 184                                  *  otherwise returns false.
 185                                  *
 186                                  *  \note This token is not available on some AVR models which do not support hardware VBUS monitoring.
 187                                  */
 188                                 #define USB_VBUS_GetStatus()             ((USBSTA & (1 << VBUS)) ? true : false)
 189                         #endif
 190
 191                         /** Detaches the device from the USB bus. This has the effect of removing the device from any
 192                          *  attached host, ceasing USB communications. If no host is present, this prevents any host from
 193                          *  enumerating the device once attached until \ref USB_Attach() is called.
 194                          */
 195                         #define USB_Detach()                    MACROS{ UDCON  |=  (1 << DETACH);  }MACROE
 196
 197                         /** Attaches the device to the USB bus. This announces the device's presence to any attached
 198                          *  USB host, starting the enumeration process. If no host is present, attaching the device
 199                          *  will allow for enumeration once a host is connected to the device.
 200                          *
 201                          *  This is inexplicably also required for proper operation while in host mode, to enable the
 202                          *  attachment of a device to the host. This is despite the bit being located in the device-mode
 203                          *  register and despite the datasheet making no mention of its requirement in host mode.
 204                          */
 205                         #define USB_Attach()                    MACROS{ UDCON  &= ~(1 << DETACH);  }MACROE
 206
 207                         #if !defined(USB_STREAM_TIMEOUT_MS) || defined(__DOXYGEN__)
 208                                 /** Constant for the maximum software timeout period of the USB data stream transfer functions
 209                                  *  (both control and standard) when in either device or host mode. If the next packet of a stream
 210                                  *  is not received or acknowledged within this time period, the stream function will fail.
 211                                  *
 212                                  *  This value may be overridden in the user project makefile as the value of the
 213                                  *  \ref USB_STREAM_TIMEOUT_MS token, and passed to the compiler using the -D switch.
 214                                  */
 215                                 #define USB_STREAM_TIMEOUT_MS       100
 216                         #endif
 217
 218                 /* Function Prototypes: */
 219                         /** Main function to initialize and start the USB interface. Once active, the USB interface will
 220                          *  allow for device connection to a host when in device mode, or for device enumeration while in
 221                          *  host mode.
 222                          *
 223                          *  As the USB library relies on USB interrupts for some of its functionality, this routine will
 224                          *  enable global interrupts.
 225                          *
 226                          *  Calling this function when the USB interface is already initialized will cause a complete USB
 227                          *  interface reset and re-enumeration.
 228                          *
 229                          *  \param[in] Mode     This is a mask indicating what mode the USB interface is to be initialized to.
 230                          *                      Valid mode masks are \ref USB_MODE_DEVICE, \ref USB_MODE_HOST or \ref USB_MODE_UID.
 231                          *
 232                          *  \param[in] Options  Mask indicating the options which should be used when initializing the USB
 233                          *                      interface to control the USB interface's behaviour. This should be comprised of
 234                          *                      a USB_OPT_REG_* mask to control the regulator, a USB_OPT_*_PLL mask to control the
 235                          *                      PLL, and a USB_DEVICE_OPT_* mask (when the device mode is enabled) to set the device
 236                          *                      mode speed.
 237                          *
 238                          *  \note To reduce the FLASH requirements of the library if only device or host mode is required,
 239                          *        this can be statically set via defining the token USB_DEVICE_ONLY for device mode or
 240                          *        USB_HOST_ONLY for host mode in the use project makefile, passing the token to the compiler
 241                          *        via the -D switch. If the mode is statically set, this parameter does not exist in the
 242                          *        function prototype.
 243                          *
 244                          *  \note To reduce the FLASH requirements of the library if only fixed settings are are required,
 245                          *        the options may be set statically in the same manner as the mode (see the Mode parameter of
 246                          *        this function). To statically set the USB options, pass in the USE_STATIC_OPTIONS token,
 247                          *        defined to the appropriate options masks. When the options are statically set, this
 248                          *        parameter does not exist in the function prototype.
 249                          *
 250                          *  \note The mode parameter does not exist on devices where only one mode is possible, such as USB
 251                          *        AVR models which only implement the USB device mode in hardware.
 252                          *
 253                          *  \see Device.h for the USB_DEVICE_OPT_* masks.
 254                          */
 255                         void USB_Init(
 256                                        #if defined(USB_CAN_BE_BOTH) || defined(__DOXYGEN__)
 257                                        const uint8_t Mode
 258                                                    #endif
 259
 260                                        #if (defined(USB_CAN_BE_BOTH) && !defined(USE_STATIC_OPTIONS)) || defined(__DOXYGEN__)
 261                                        ,
 262                                                    #elif (!defined(USB_CAN_BE_BOTH) && defined(USE_STATIC_OPTIONS))
 263                                                    void
 264                                        #endif
 265
 266                                        #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 267                                        const uint8_t Options
 268                                        #endif
 269                                        );
 270
 271                         /** Shuts down the USB interface. This turns off the USB interface after deallocating all USB FIFO
 272                          *  memory, endpoints and pipes. When turned off, no USB functionality can be used until the interface
 273                          *  is restarted with the \ref USB_Init() function.
 274                          */
 275                         void USB_ShutDown(void);
 276
 277                         /** Resets the interface, when already initialized. This will re-enumerate the device if already connected
 278                          *  to a host, or re-enumerate an already attached device when in host mode.
 279                          */
 280                         void USB_ResetInterface(void);
 281
 282                 /* Enums: */
 283                         /** Enum for error codes relating to the powering on of the USB interface. These error codes are
 284                          *  used in the ErrorCode parameter value of the \ref EVENT_USB_InitFailure() event.
 285                          */
 286                         enum USB_InitErrorCodes_t
 287                         {
 288                                 USB_INITERROR_NoUSBModeSpecified       = 0, /**< Indicates that \ref USB_Init() was called with an
 289                                                                          *   invalid or missing Mode parameter.
 290                                                                          */
 291                         };
 292
 293                 /* Global Variables: */
 294                         #if (!defined(USB_HOST_ONLY) && !defined(USB_DEVICE_ONLY)) || defined(__DOXYGEN__)
 295                                 /** Indicates the mode that the USB interface is currently initialized to. This value will be
 296                                  *  one of the USB_MODE_* masks defined elsewhere in this module.
 297                                  *
 298                                  *  \note This variable should be treated as read-only in the user application, and never manually
 299                                  *        changed in value.
 300                                  */
 301                                 extern volatile uint8_t USB_CurrentMode;
 302                         #elif defined(USB_HOST_ONLY)
 303                                 #define USB_CurrentMode USB_MODE_HOST
 304                         #elif defined(USB_DEVICE_ONLY)
 305                                 #define USB_CurrentMode USB_MODE_DEVICE
 306                         #endif
 307
 308                         #if !defined(USE_STATIC_OPTIONS) || defined(__DOXYGEN__)
 309                                 /** Indicates the current USB options that the USB interface was initialized with when \ref USB_Init()
 310                                  *  was called. This value will be one of the USB_MODE_* masks defined elsewhere in this module.
 311                                  *
 312                                  *  \note This variable should be treated as read-only in the user application, and never manually
 313                                  *        changed in value.
 314                                  */
 315                                 extern volatile uint8_t USB_Options;
 316                         #elif defined(USE_STATIC_OPTIONS)
 317                                 #define USB_Options USE_STATIC_OPTIONS
 318                         #endif
 319
 320         /* Private Interface - For use in library only: */
 321         #if !defined(__DOXYGEN__)
 322                 /* Macros: */
 323                         #define USB_PLL_On()               MACROS{ PLLCSR   =  USB_PLL_PSC; PLLCSR |= (1 << PLLE); }MACROE
 324                         #define USB_PLL_Off()              MACROS{ PLLCSR   =  0;                           }MACROE
 325                         #define USB_PLL_IsReady()                ((PLLCSR  &   (1 << PLOCK)) ? true : false)
 326
 327                         #if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
 328                                 #define USB_REG_On()           MACROS{ UHWCON  |=  (1 << UVREGE);               }MACROE
 329                                 #define USB_REG_Off()          MACROS{ UHWCON  &= ~(1 << UVREGE);               }MACROE
 330                         #else
 331                                 #define USB_REG_On()           MACROS{ REGCR   &= ~(1 << REGDIS);               }MACROE
 332                                 #define USB_REG_Off()          MACROS{ REGCR   |=  (1 << REGDIS);               }MACROE
 333                         #endif
 334
 335                         #define USB_OTGPAD_On()            MACROS{ USBCON  |=  (1 << OTGPADE);              }MACROE
 336                         #define USB_OTGPAD_Off()           MACROS{ USBCON  &= ~(1 << OTGPADE);              }MACROE
 337
 338                         #define USB_CLK_Freeze()           MACROS{ USBCON  |=  (1 << FRZCLK);               }MACROE
 339                         #define USB_CLK_Unfreeze()         MACROS{ USBCON  &= ~(1 << FRZCLK);               }MACROE
 340
 341                         #define USB_Controller_Enable()    MACROS{ USBCON  |=  (1 << USBE);                 }MACROE
 342                         #define USB_Controller_Disable()   MACROS{ USBCON  &= ~(1 << USBE);                 }MACROE
 343                         #define USB_Controller_Reset()     MACROS{ const uint8_t Temp = USBCON; USBCON = (Temp & ~(1 << USBE)); \
 344                                                                    USBCON = (Temp | (1 << USBE));           }MACROE
 345
 346                 /* Inline Functions: */
 347                         #if defined(USB_CAN_BE_BOTH)
 348                         static inline uint8_t USB_GetUSBModeFromUID(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 349                         static inline uint8_t USB_GetUSBModeFromUID(void)
 350                         {
 351                                 if (USBSTA & (1 << ID))
 352                                   return USB_MODE_DEVICE;
 353                                 else
 354                                   return USB_MODE_HOST;
 355                         }
 356                         #endif
 357
 358         #endif
 359
 360         /* Disable C linkage for C++ Compilers: */
 361                 #if defined(__cplusplus)
 362                         }
 363                 #endif
 364
 365 #endif
 366
 367 /** @} */