LUFA/Drivers/USB/LowLevel/LowLevel.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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 #include "LowLevel.h"
  32
  33 #if (!defined(USB_HOST_ONLY) && !defined(USB_DEVICE_ONLY))
  34 volatile uint8_t USB_CurrentMode = USB_MODE_NONE;
  35 #endif
  36
  37 #if !defined(USE_STATIC_OPTIONS)
  38 volatile uint8_t USB_Options;
  39 #endif
  40
  41 volatile bool FrameElapsed;
  42
  43 void USB_Init(
  44                #if defined(USB_CAN_BE_BOTH)
  45                const uint8_t Mode
  46                #endif
  47
  48                #if (defined(USB_CAN_BE_BOTH) && !defined(USE_STATIC_OPTIONS))
  49                ,
  50                #elif (!defined(USB_CAN_BE_BOTH) && defined(USE_STATIC_OPTIONS))
  51                void
  52                #endif
  53
  54                #if !defined(USE_STATIC_OPTIONS)
  55                const uint8_t Options
  56                #endif
  57                )
  58 {
  59         USB_ShutDown();
  60
  61         #if defined(USB_CAN_BE_BOTH)
  62         USB_CurrentMode = Mode;
  63         #endif
  64
  65         #if !defined(USE_STATIC_OPTIONS)
  66         USB_Options = Options;
  67         #endif
  68
  69         #if defined(USB_CAN_BE_HOST)
  70         USB_ControlPipeSize = PIPE_CONTROLPIPE_DEFAULT_SIZE;
  71         #endif
  72
  73         #if defined(USB_DEVICE_ONLY) && defined(USB_FULL_CONTROLLER)
  74         UHWCON |= (1 << UIMOD);
  75         #elif defined(USB_HOST_ONLY)
  76         UHWCON &= ~(1 << UIMOD);
  77         #elif defined(USB_CAN_BE_BOTH)
  78         if (Mode == USB_MODE_UID)
  79         {
  80                 UHWCON |=  (1 << UIDE);
  81
  82                 USB_INT_Clear(USB_INT_IDTI);
  83                 USB_INT_Enable(USB_INT_IDTI);
  84
  85                 USB_CurrentMode = USB_GetUSBModeFromUID();
  86         }
  87         else if (Mode == USB_MODE_DEVICE)
  88         {
  89                 UHWCON |=  (1 << UIMOD);
  90         }
  91         else if (Mode == USB_MODE_HOST)
  92         {
  93                 UHWCON &= ~(1 << UIMOD);
  94         }
  95         else
  96         {
  97                 EVENT_USB_InitFailure(USB_INITERROR_NoUSBModeSpecified);
  98                 return;
  99         }
 100         #endif
 101
 102         USB_ResetInterface();
 103
 104         #if defined(USB_FULL_CONTROLLER) || defined(USB_MODIFIED_FULL_CONTROLLER)
 105         USB_OTGPAD_On();
 106         #endif
 107
 108         USB_IsInitialized = true;
 109
 110         sei();
 111 }
 112
 113 void USB_ShutDown(void)
 114 {
 115         if (USB_IsConnected)
 116           EVENT_USB_Disconnect();
 117
 118         USB_Detach();
 119
 120         USB_INT_DisableAllInterrupts();
 121         USB_INT_ClearAllInterrupts();
 122
 123         USB_IsConnected   = false;
 124         USB_IsInitialized = false;
 125
 126         #if defined(USB_CAN_BE_HOST)
 127         USB_HostState = HOST_STATE_Unattached;
 128         #endif
 129
 130         #if defined(USB_CAN_BE_DEVICE)
 131         USB_ConfigurationNumber = 0;
 132         #endif
 133
 134         #if defined(CAN_BE_BOTH)
 135         USB_CurrentMode = USB_MODE_NONE;
 136         #endif
 137
 138         USB_Interface_Disable();
 139         USB_PLL_Off();
 140
 141         #if defined(USB_FULL_CONTROLLER) || defined(USB_MODIFIED_FULL_CONTROLLER)
 142         USB_OTGPAD_Off();
 143         #endif
 144
 145         #if defined(USB_CAN_BE_BOTH)
 146         UHWCON &= ~(1 << UIDE);
 147         #endif
 148 }
 149
 150 void USB_ResetInterface(void)
 151 {
 152         USB_INT_DisableAllInterrupts();
 153         USB_INT_ClearAllInterrupts();
 154
 155         FrameElapsed = false;
 156
 157         USB_IsConnected = false;
 158
 159         #if defined(USB_CAN_BE_HOST)
 160         USB_HostState = HOST_STATE_Unattached;
 161         #endif
 162
 163         #if defined(USB_CAN_BE_DEVICE)
 164         USB_ConfigurationNumber  = 0;
 165         USB_IsSuspended          = false;
 166         USB_RemoteWakeupEnabled  = false;
 167         USB_CurrentlySelfPowered = false;
 168         #endif
 169
 170         if (!(USB_Options & USB_OPT_MANUAL_PLL))
 171         {
 172                 #if defined(USB_MODIFIED_FULL_CONTROLLER)
 173                 PLLFRQ = ((1 << PLLUSB) | (1 << PDIV3) | (1 << PDIV1));
 174                 #endif
 175
 176                 USB_PLL_On();
 177                 while (!(USB_PLL_IsReady()));
 178         }
 179
 180         USB_Interface_Reset();
 181
 182         #if defined(USB_CAN_BE_BOTH)
 183         if (UHWCON & (1 << UIDE))
 184         {
 185                 USB_INT_Clear(USB_INT_IDTI);
 186                 USB_INT_Enable(USB_INT_IDTI);
 187                 USB_CurrentMode = USB_GetUSBModeFromUID();
 188         }
 189         #endif
 190
 191         if (!(USB_Options & USB_OPT_REG_DISABLED))
 192           USB_REG_On();
 193
 194         USB_CLK_Unfreeze();
 195
 196         #if (defined(USB_CAN_BE_DEVICE) && (defined(USB_FULL_CONTROLLER) || defined(USB_MODIFIED_FULL_CONTROLLER)))
 197         if (USB_CurrentMode == USB_MODE_DEVICE)
 198         {
 199                 if (USB_Options & USB_DEVICE_OPT_LOWSPEED)
 200                   USB_Device_SetLowSpeed();
 201                 else
 202                   USB_Device_SetHighSpeed();
 203
 204                 USB_INT_Enable(USB_INT_VBUS);
 205         }
 206         #endif
 207
 208         #if (defined(USB_CAN_BE_DEVICE) && !defined(FIXED_CONTROL_ENDPOINT_SIZE))
 209         if (USB_CurrentMode == USB_MODE_DEVICE)
 210         {
 211                 USB_Descriptor_Device_t* DeviceDescriptorPtr;
 212
 213                 if (CALLBACK_USB_GetDescriptor((DTYPE_Device << 8), 0, (void*)&DeviceDescriptorPtr) != NO_DESCRIPTOR)
 214                 {
 215                         #if defined(USE_RAM_DESCRIPTORS)
 216                                 USB_ControlEndpointSize = DeviceDescriptorPtr->Endpoint0Size;
 217                         #elif defined(USE_EEPROM_DESCRIPTORS)
 218                                 USB_ControlEndpointSize = eeprom_read_byte(&DeviceDescriptorPtr->Endpoint0Size);
 219                         #else
 220                                 USB_ControlEndpointSize = pgm_read_byte(&DeviceDescriptorPtr->Endpoint0Size);
 221                         #endif
 222                 }
 223         }
 224         #endif
 225
 226         USB_Attach();
 227
 228         #if defined(USB_DEVICE_ONLY)
 229         USB_INT_Enable(USB_INT_SUSPEND);
 230         USB_INT_Enable(USB_INT_EORSTI);
 231         USB_INT_Enable(USB_INT_SOFI);
 232
 233         #if defined(CONTROL_ONLY_DEVICE)
 234         UENUM = ENDPOINT_CONTROLEP;
 235         #endif
 236
 237         #elif defined(USB_HOST_ONLY)
 238         USB_Host_HostMode_On();
 239
 240         USB_Host_VBUS_Auto_Off();
 241         USB_OTGPAD_Off();
 242
 243         USB_Host_VBUS_Manual_Enable();
 244         USB_Host_VBUS_Manual_On();
 245
 246         USB_INT_Enable(USB_INT_SRPI);
 247         USB_INT_Enable(USB_INT_BCERRI);
 248         USB_INT_Enable(USB_INT_HSOFI);
 249         #else
 250         if (USB_CurrentMode == USB_MODE_DEVICE)
 251         {
 252                 USB_INT_Enable(USB_INT_SUSPEND);
 253                 USB_INT_Enable(USB_INT_EORSTI);
 254                 USB_INT_Enable(USB_INT_SOFI);
 255
 256                 #if defined(CONTROL_ONLY_DEVICE)
 257                 UENUM = ENDPOINT_CONTROLEP;
 258                 #endif
 259         }
 260         else if (USB_CurrentMode == USB_MODE_HOST)
 261         {
 262                 USB_Host_HostMode_On();
 263
 264                 USB_Host_VBUS_Auto_Off();
 265                 USB_OTGPAD_Off();
 266
 267                 USB_Host_VBUS_Manual_Enable();
 268                 USB_Host_VBUS_Manual_On();
 269
 270                 USB_INT_Enable(USB_INT_SRPI);
 271                 USB_INT_Enable(USB_INT_BCERRI);
 272                 USB_INT_Enable(USB_INT_HSOFI);
 273         }
 274         #endif
 275 }