Demos/Host/GenericHIDHost/GenericHIDHost.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 /** \file
  32  *
  33  *  Main source file for the GenericHIDHost demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "GenericHIDHost.h"
  38
  39 /* Project Tags, for reading out using the ButtLoad project */
  40 BUTTLOADTAG(ProjName,    "LUFA GenHid Host App");
  41 BUTTLOADTAG(BuildTime,   __TIME__);
  42 BUTTLOADTAG(BuildDate,   __DATE__);
  43 BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);
  44
  45 /* Scheduler Task List */
  46 TASK_LIST
  47 {
  48         { Task: USB_USBTask          , TaskStatus: TASK_STOP },
  49         { Task: USB_HID_Host         , TaskStatus: TASK_STOP },
  50 };
  51
  52
  53 /** Main program entry point. This routine configures the hardware required by the application, then
  54  *  starts the scheduler to run the application tasks.
  55  */
  56 int main(void)
  57 {
  58         /* Disable watchdog if enabled by bootloader/fuses */
  59         MCUSR &= ~(1 << WDRF);
  60         wdt_disable();
  61
  62         /* Disable clock division */
  63         clock_prescale_set(clock_div_1);
  64
  65         /* Hardware Initialization */
  66         SerialStream_Init(9600, false);
  67         LEDs_Init();
  68
  69         /* Indicate USB not ready */
  70         UpdateStatus(Status_USBNotReady);
  71
  72         /* Initialize Scheduler so that it can be used */
  73         Scheduler_Init();
  74
  75         /* Initialize USB Subsystem */
  76         USB_Init();
  77
  78         /* Start-up message */
  79         puts_P(PSTR(ESC_RESET ESC_BG_WHITE ESC_INVERSE_ON ESC_ERASE_DISPLAY
  80                "Generic HID Host Demo running.\r\n" ESC_INVERSE_OFF));
  81
  82         /* Scheduling - routine never returns, so put this last in the main function */
  83         Scheduler_Start();
  84 }
  85
  86 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  87  *  starts the library USB task to begin the enumeration and USB management process.
  88  */
  89 EVENT_HANDLER(USB_DeviceAttached)
  90 {
  91         puts_P(PSTR("Device Attached.\r\n"));
  92         UpdateStatus(Status_USBEnumerating);
  93
  94         /* Start USB management task to enumerate the device */
  95         Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
  96 }
  97
  98 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  99  *  stops the library USB task management process.
 100  */
 101 EVENT_HANDLER(USB_DeviceUnattached)
 102 {
 103         /* Stop HID and USB management task */
 104         Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
 105         Scheduler_SetTaskMode(USB_HID_Host, TASK_STOP);
 106
 107         puts_P(PSTR("Device Unattached.\r\n"));
 108         UpdateStatus(Status_USBNotReady);
 109 }
 110
 111 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 112  *  enumerated by the host and is now ready to be used by the application.
 113  */
 114 EVENT_HANDLER(USB_DeviceEnumerationComplete)
 115 {
 116         /* Start HID Host task */
 117         Scheduler_SetTaskMode(USB_HID_Host, TASK_RUN);
 118
 119         /* Indicate device enumeration complete */
 120         UpdateStatus(Status_USBReady);
 121 }
 122
 123 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 124 EVENT_HANDLER(USB_HostError)
 125 {
 126         USB_ShutDown();
 127
 128         puts_P(PSTR(ESC_BG_RED "Host Mode Error\r\n"));
 129         printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
 130
 131         UpdateStatus(Status_HardwareError);
 132         for(;;);
 133 }
 134
 135 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 136  *  enumerating an attached USB device.
 137  */
 138 EVENT_HANDLER(USB_DeviceEnumerationFailed)
 139 {
 140         puts_P(PSTR(ESC_BG_RED "Dev Enum Error\r\n"));
 141         printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
 142         printf_P(PSTR(" -- Sub Error Code %d\r\n"), SubErrorCode);
 143         printf_P(PSTR(" -- In State %d\r\n"), USB_HostState);
 144
 145         UpdateStatus(Status_EnumerationError);
 146 }
 147
 148 /** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
 149  *  log to a serial port, or anything else that is suitable for status updates.
 150  *
 151  *  \param CurrentStatus  Current status of the system, from the GenericHIDHost_StatusCodes_t enum
 152  */
 153 void UpdateStatus(uint8_t CurrentStatus)
 154 {
 155         uint8_t LEDMask = LEDS_NO_LEDS;
 156
 157         /* Set the LED mask to the appropriate LED mask based on the given status code */
 158         switch (CurrentStatus)
 159         {
 160                 case Status_USBNotReady:
 161                         LEDMask = (LEDS_LED1);
 162                         break;
 163                 case Status_USBEnumerating:
 164                         LEDMask = (LEDS_LED1 | LEDS_LED2);
 165                         break;
 166                 case Status_USBReady:
 167                         LEDMask = (LEDS_LED2);
 168                         break;
 169                 case Status_EnumerationError:
 170                 case Status_HardwareError:
 171                         LEDMask = (LEDS_LED1 | LEDS_LED3);
 172                         break;
 173         }
 174
 175         /* Set the board LEDs to the new LED mask */
 176         LEDs_SetAllLEDs(LEDMask);
 177 }
 178
 179 /** Reads in and processes the next report from the attached device, displaying the report
 180  *  contents on the board LEDs and via the serial port.
 181  */
 182 void ReadNextReport(void)
 183 {
 184         /* Select and unfreeze HID data IN pipe */
 185         Pipe_SelectPipe(HID_DATA_IN_PIPE);
 186         Pipe_Unfreeze();
 187
 188         /* Ensure pipe contains data and is ready to be read before continuing */
 189         if (!(Pipe_ReadWriteAllowed()))
 190         {
 191                 #if !defined(INTERRUPT_DATA_PIPE)
 192                 /* Refreeze HID data IN pipe */
 193                 Pipe_Freeze();
 194                 #endif
 195
 196                 return;
 197         }
 198
 199         uint8_t ReportINData[Pipe_BytesInPipe()];
 200
 201         /* Read in HID report data */
 202         Pipe_Read_Stream_LE(&ReportINData, sizeof(ReportINData));
 203
 204         /* Clear the IN endpoint, ready for next data packet */
 205         Pipe_ClearCurrentBank();
 206
 207         /* Print report data through the serial port */
 208         for (uint16_t CurrByte = 0; CurrByte < sizeof(ReportINData); CurrByte++)
 209           printf_P(PSTR("0x%02X "), ReportINData[CurrByte]);
 210
 211         puts_P(PSTR("\r\n"));
 212
 213         #if !defined(INTERRUPT_DATA_PIPE)
 214         /* Refreeze HID data IN pipe */
 215         Pipe_Freeze();
 216         #endif
 217 }
 218
 219 /** Writes a report to the attached device.
 220  *
 221  *  \param ReportOUTData  Buffer containing the report to send to the device
 222  *  \param ReportLength  Length of the report to send
 223  */
 224 void WriteNextReport(uint8_t* ReportOUTData, uint16_t ReportLength)
 225 {
 226         /* Select and unfreeze HID data OUT pipe */
 227         Pipe_SelectPipe(HID_DATA_OUT_PIPE);
 228
 229         /* Not all HID devices have an OUT endpoint (some require OUT reports to be sent over the
 230          * control endpoint instead) - check to see if the OUT endpoint has been initialized */
 231         if (Pipe_IsConfigured())
 232         {
 233                 Pipe_Unfreeze();
 234
 235                 /* Ensure pipe is ready to be written to before continuing */
 236                 if (!(Pipe_ReadWriteAllowed()))
 237                 {
 238                         /* Refreeze the data OUT pipe */
 239                         Pipe_Freeze();
 240
 241                         return;
 242                 }
 243
 244                 /* Read in HID report data */
 245                 Pipe_Write_Stream_LE(ReportOUTData, ReportLength);
 246
 247                 /* Clear the OUT endpoint, send last data packet */
 248                 Pipe_ClearCurrentBank();
 249
 250                 /* Refreeze the data OUT pipe */
 251                 Pipe_Freeze();
 252         }
 253         else
 254         {
 255                 /* Class specific request to send a HID report to the device */
 256                 USB_HostRequest = (USB_Host_Request_Header_t)
 257                         {
 258                                 bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
 259                                 bRequest:      REQ_SetReport,
 260                                 wValue:        0,
 261                                 wIndex:        0,
 262                                 wLength:       ReportLength,
 263                         };
 264
 265                 /* Send the request to the device */
 266                 USB_Host_SendControlRequest(ReportOUTData);
 267         }
 268 }
 269
 270 /** Task to set the configuration of the attached device after it has been enumerated, and to read and process
 271  *  HID reports from the device and to send reports if desired.
 272  */
 273 TASK(USB_HID_Host)
 274 {
 275         uint8_t ErrorCode;
 276
 277         /* Switch to determine what user-application handled host state the host state machine is in */
 278         switch (USB_HostState)
 279         {
 280                 case HOST_STATE_Addressed:
 281                         /* Standard request to set the device configuration to configuration 1 */
 282                         USB_HostRequest = (USB_Host_Request_Header_t)
 283                                 {
 284                                         bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_DEVICE),
 285                                         bRequest:      REQ_SetConfiguration,
 286                                         wValue:        1,
 287                                         wIndex:        0,
 288                                         wLength:       0,
 289                                 };
 290
 291                         /* Send the request, display error and wait for device detach if request fails */
 292                         if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
 293                         {
 294                                 puts_P(PSTR("Control Error (Set Configuration).\r\n"));
 295                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 296
 297                                 /* Indicate error status */
 298                                 UpdateStatus(Status_EnumerationError);
 299
 300                                 /* Wait until USB device disconnected */
 301                                 while (USB_IsConnected);
 302                                 break;
 303                         }
 304
 305                         USB_HostState = HOST_STATE_Configured;
 306                         break;
 307                 case HOST_STATE_Configured:
 308                         puts_P(PSTR("Getting Config Data.\r\n"));
 309
 310                         /* Get and process the configuration descriptor data */
 311                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 312                         {
 313                                 if (ErrorCode == ControlError)
 314                                   puts_P(PSTR("Control Error (Get Configuration).\r\n"));
 315                                 else
 316                                   puts_P(PSTR("Invalid Device.\r\n"));
 317
 318                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 319
 320                                 /* Indicate error status */
 321                                 UpdateStatus(Status_EnumerationError);
 322
 323                                 /* Wait until USB device disconnected */
 324                                 while (USB_IsConnected);
 325                                 break;
 326                         }
 327
 328                         #if defined(INTERRUPT_DATA_PIPE)
 329                         /* Select and unfreeze HID data IN pipe */
 330                         Pipe_SelectPipe(HID_DATA_IN_PIPE);
 331                         Pipe_Unfreeze();
 332                         #endif
 333
 334                         puts_P(PSTR("HID Device Enumerated.\r\n"));
 335
 336                         USB_HostState = HOST_STATE_Ready;
 337                         break;
 338                 #if !defined(INTERRUPT_DATA_PIPE)
 339                 case HOST_STATE_Ready:
 340                         ReadNextReport();
 341
 342                         break;
 343                 #endif
 344         }
 345 }
 346
 347 #if defined(INTERRUPT_DATA_PIPE)
 348 /** Interrupt handler for the Endpoint/Pipe interrupt vector. This interrupt fires each time an enabled
 349  *  pipe interrupt occurs on a pipe which has had that interrupt enabled.
 350  */
 351 ISR(ENDPOINT_PIPE_vect, ISR_BLOCK)
 352 {
 353         /* Save previously selected pipe before selecting a new pipe */
 354         uint8_t PrevSelectedPipe = Pipe_GetCurrentPipe();
 355
 356         /* Check to see if the HID data IN pipe has caused the interrupt */
 357         if (Pipe_HasPipeInterrupted(HID_DATA_IN_PIPE))
 358         {
 359                 /* Clear the pipe interrupt, and select the data IN pipe */
 360                 Pipe_ClearPipeInterrupt(HID_DATA_IN_PIPE);
 361                 Pipe_SelectPipe(HID_DATA_IN_PIPE);
 362
 363                 /* Check to see if the pipe IN interrupt has fired */
 364                 if (USB_INT_HasOccurred(PIPE_INT_IN) && USB_INT_IsEnabled(PIPE_INT_IN))
 365                 {
 366                         /* Clear interrupt flag */
 367                         USB_INT_Clear(PIPE_INT_IN);
 368
 369                         /* Read and process the next report from the device */
 370                         ReadNextReport();
 371                 }
 372         }
 373
 374         /* Restore previously selected pipe */
 375         Pipe_SelectPipe(PrevSelectedPipe);
 376 }
 377 #endif