Demos/Host/KeyboardHost/KeyboardHost.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 KeyboardHost demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "KeyboardHost.h"
  38
  39 /* Project Tags, for reading out using the ButtLoad project */
  40 BUTTLOADTAG(ProjName,    "LUFA KBD 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_Keyboard_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                "Keyboard 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 Keyboard and USB management task */
 104         Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
 105         Scheduler_SetTaskMode(USB_Keyboard_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 Keyboard Host task */
 117         Scheduler_SetTaskMode(USB_Keyboard_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 KeyboardHost_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         USB_KeyboardReport_Data_t KeyboardReport;
 185
 186         /* Select keyboard data pipe */
 187         Pipe_SelectPipe(KEYBOARD_DATAPIPE);
 188
 189         #if !defined(INTERRUPT_DATA_PIPE)
 190         /* Unfreeze keyboard data pipe */
 191         Pipe_Unfreeze();
 192         #endif
 193
 194         /* Ensure pipe contains data and is ready to be read before continuing */
 195         if (!(Pipe_ReadWriteAllowed()))
 196         {
 197                 #if !defined(INTERRUPT_DATA_PIPE)
 198                 /* Refreeze keyboard data pipe */
 199                 Pipe_Freeze();
 200                 #endif
 201
 202                 return;
 203         }
 204
 205         /* Read in keyboard report data */
 206         Pipe_Read_Stream_LE(&KeyboardReport, sizeof(KeyboardReport));
 207
 208         /* Clear the IN endpoint, ready for next data packet */
 209         Pipe_ClearCurrentBank();
 210
 211         /* Indicate if the modifier byte is non-zero (special key such as shift is being pressed) */
 212         LEDs_ChangeLEDs(LEDS_LED1, (KeyboardReport.Modifier) ? LEDS_LED1 : 0);
 213
 214         /* Check if a key has been pressed */
 215         if (KeyboardReport.KeyCode)
 216         {
 217                 /* Toggle status LED to indicate keypress */
 218                 if (LEDs_GetLEDs() & LEDS_LED2)
 219                   LEDs_TurnOffLEDs(LEDS_LED2);
 220                 else
 221                   LEDs_TurnOnLEDs(LEDS_LED2);
 222
 223                 char PressedKey = 0;
 224
 225                 /* Retrieve pressed key character if alphanumeric */
 226                 if ((KeyboardReport.KeyCode >= 0x04) && (KeyboardReport.KeyCode <= 0x1D))
 227                   PressedKey = (KeyboardReport.KeyCode - 0x04) + 'A';
 228                 else if ((KeyboardReport.KeyCode >= 0x1E) && (KeyboardReport.KeyCode <= 0x27))
 229                   PressedKey = (KeyboardReport.KeyCode - 0x1E) + '0';
 230                 else if (KeyboardReport.KeyCode == 0x2C)
 231                   PressedKey = ' ';
 232                 else if (KeyboardReport.KeyCode == 0x28)
 233                   PressedKey = '\n';
 234
 235                 /* Print the pressed key character out through the serial port if valid */
 236                 if (PressedKey)
 237                   putchar(PressedKey);
 238         }
 239
 240         #if !defined(INTERRUPT_DATA_PIPE)
 241         /* Refreeze keyboard data pipe */
 242         Pipe_Freeze();
 243         #endif
 244 }
 245
 246 /** Task to set the configuration of the attached device after it has been enumerated, and to read and process
 247  *  HID reports from the device and display the results onto the board LEDs.
 248  */
 249 TASK(USB_Keyboard_Host)
 250 {
 251         uint8_t ErrorCode;
 252
 253         switch (USB_HostState)
 254         {
 255                 case HOST_STATE_Addressed:
 256                         /* Standard request to set the device configuration to configuration 1 */
 257                         USB_HostRequest = (USB_Host_Request_Header_t)
 258                                 {
 259                                         bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_DEVICE),
 260                                         bRequest:      REQ_SetConfiguration,
 261                                         wValue:        1,
 262                                         wIndex:        0,
 263                                         wLength:       0,
 264                                 };
 265
 266                         /* Send the request, display error and wait for device detach if request fails */
 267                         if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
 268                         {
 269                                 puts_P(PSTR("Control Error (Set Configuration).\r\n"));
 270                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 271
 272                                 /* Indicate error status */
 273                                 UpdateStatus(Status_EnumerationError);
 274
 275                                 /* Wait until USB device disconnected */
 276                                 while (USB_IsConnected);
 277                                 break;
 278                         }
 279
 280                         USB_HostState = HOST_STATE_Configured;
 281                         break;
 282                 case HOST_STATE_Configured:
 283                         puts_P(PSTR("Getting Config Data.\r\n"));
 284
 285                         /* Get and process the configuration descriptor data */
 286                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 287                         {
 288                                 if (ErrorCode == ControlError)
 289                                   puts_P(PSTR("Control Error (Get Configuration).\r\n"));
 290                                 else
 291                                   puts_P(PSTR("Invalid Device.\r\n"));
 292
 293                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 294
 295                                 /* Indicate error status */
 296                                 UpdateStatus(Status_EnumerationError);
 297
 298                                 /* Wait until USB device disconnected */
 299                                 while (USB_IsConnected);
 300                                 break;
 301                         }
 302
 303                         /* HID class request to set the keyboard protocol to the Boot Protocol */
 304                         USB_HostRequest = (USB_Host_Request_Header_t)
 305                                 {
 306                                         bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
 307                                         bRequest:      REQ_SetProtocol,
 308                                         wValue:        0,
 309                                         wIndex:        0,
 310                                         wLength:       0,
 311                                 };
 312
 313                         /* Send the request, display error and wait for device detach if request fails */
 314                         if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
 315                         {
 316                                 puts_P(PSTR("Control Error (Set Protocol).\r\n"));
 317                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 318
 319                                 /* Indicate error status */
 320                                 UpdateStatus(Status_EnumerationError);
 321
 322                                 /* Wait until USB device disconnected */
 323                                 while (USB_IsConnected);
 324                                 break;
 325                         }
 326
 327                         #if defined(INTERRUPT_DATA_PIPE)
 328                         /* Select and unfreeze keyboard data pipe */
 329                         Pipe_SelectPipe(KEYBOARD_DATAPIPE);
 330                         Pipe_Unfreeze();
 331                         #endif
 332
 333                         puts_P(PSTR("Keyboard Enumerated.\r\n"));
 334
 335                         USB_HostState = HOST_STATE_Ready;
 336                         break;
 337                 #if !defined(INTERRUPT_DATA_PIPE)
 338                 case HOST_STATE_Ready:
 339                         /* If a report has been received, read and process it */
 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 keyboard data pipe has caused the interrupt */
 357         if (Pipe_HasPipeInterrupted(KEYBOARD_DATAPIPE))
 358         {
 359                 /* Clear the pipe interrupt, and select the keyboard pipe */
 360                 Pipe_ClearPipeInterrupt(KEYBOARD_DATAPIPE);
 361                 Pipe_SelectPipe(KEYBOARD_DATAPIPE);
 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         /* Restore previously selected pipe */
 374         Pipe_SelectPipe(PrevSelectedPipe);
 375 }
 376 #endif