Demos/Device/LowLevel/Keyboard/Keyboard.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  Denver Gingerich (denver [at] ossguy [dot] com)
  11       Based on code by Dean Camera (dean [at] fourwalledcubicle [dot] com)
  12
  13   Permission to use, copy, modify, and distribute this software
  14   and its documentation for any purpose and without fee is hereby
  15   granted, provided that the above copyright notice appear in all
  16   copies and that both that the copyright notice and this
  17   permission notice and warranty disclaimer appear in supporting
  18   documentation, and that the name of the author not be used in
  19   advertising or publicity pertaining to distribution of the
  20   software without specific, written prior permission.
  21
  22   The author disclaim all warranties with regard to this
  23   software, including all implied warranties of merchantability
  24   and fitness.  In no event shall the author be liable for any
  25   special, indirect or consequential damages or any damages
  26   whatsoever resulting from loss of use, data or profits, whether
  27   in an action of contract, negligence or other tortious action,
  28   arising out of or in connection with the use or performance of
  29   this software.
  30 */
  31
  32 /** \file
  33  *
  34  *  Main source file for the Keyboard demo. This file contains the main tasks of the demo and
  35  *  is responsible for the initial application hardware configuration.
  36  */
  37
  38 #include "Keyboard.h"
  39
  40 /* Global Variables */
  41 /** Indicates what report mode the host has requested, true for normal HID reporting mode, false for special boot
  42  *  protocol reporting mode.
  43  */
  44 bool UsingReportProtocol = true;
  45
  46 /** Current Idle period. This is set by the host via a Set Idle HID class request to silence the device's reports
  47  *  for either the entire idle duration, or until the report status changes (e.g. the user presses a key).
  48  */
  49 uint16_t IdleCount = 500;
  50
  51 /** Current Idle period remaining. When the IdleCount value is set, this tracks the remaining number of idle
  52  *  milliseconds. This is separate to the IdleCount timer and is incremented and compared as the host may request
  53  *  the current idle period via a Get Idle HID class request, thus its value must be preserved.
  54  */
  55 uint16_t IdleMSRemaining = 0;
  56
  57
  58 /** Main program entry point. This routine configures the hardware required by the application, then
  59  *  starts the scheduler to run the USB management task.
  60  */
  61 int main(void)
  62 {
  63         SetupHardware();
  64
  65         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  66
  67         for (;;)
  68         {
  69                 HID_Task();
  70                 USB_USBTask();
  71         }
  72 }
  73
  74 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  75 void SetupHardware(void)
  76 {
  77         /* Disable watchdog if enabled by bootloader/fuses */
  78         MCUSR &= ~(1 << WDRF);
  79         wdt_disable();
  80
  81         /* Disable clock division */
  82         clock_prescale_set(clock_div_1);
  83
  84         /* Hardware Initialization */
  85         Joystick_Init();
  86         LEDs_Init();
  87         USB_Init();
  88
  89         /* Millisecond timer initialization, with output compare interrupt enabled for the idle timing */
  90         OCR0A  = 0x7D;
  91         TCCR0A = (1 << WGM01);
  92         TCCR0B = ((1 << CS01) | (1 << CS00));
  93         TIMSK0 = (1 << OCIE0A);
  94 }
  95
  96 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
  97  *  starts the library USB task to begin the enumeration and USB management process.
  98  */
  99 void EVENT_USB_Connect(void)
 100 {
 101         /* Indicate USB enumerating */
 102         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 103
 104         /* Default to report protocol on connect */
 105         UsingReportProtocol = true;
 106 }
 107
 108 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 109  *  the status LEDs.
 110  */
 111 void EVENT_USB_Disconnect(void)
 112 {
 113         /* Indicate USB not ready */
 114         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 115 }
 116
 117 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host sets the current configuration
 118  *  of the USB device after enumeration, and configures the keyboard device endpoints.
 119  */
 120 void EVENT_USB_ConfigurationChanged(void)
 121 {
 122         /* Setup Keyboard Keycode Report Endpoint */
 123         Endpoint_ConfigureEndpoint(KEYBOARD_EPNUM, EP_TYPE_INTERRUPT,
 124                                        ENDPOINT_DIR_IN, KEYBOARD_EPSIZE,
 125                                    ENDPOINT_BANK_SINGLE);
 126
 127         /* Setup Keyboard LED Report Endpoint */
 128         Endpoint_ConfigureEndpoint(KEYBOARD_LEDS_EPNUM, EP_TYPE_INTERRUPT,
 129                                        ENDPOINT_DIR_OUT, KEYBOARD_EPSIZE,
 130                                    ENDPOINT_BANK_SINGLE);
 131
 132         /* Indicate USB connected and ready */
 133         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 134 }
 135
 136 /** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
 137  *  control requests that are not handled internally by the USB library (including the HID commands, which are
 138  *  all issued via the control endpoint), so that they can be handled appropriately for the application.
 139  */
 140 void EVENT_USB_UnhandledControlPacket(void)
 141 {
 142         /* Handle HID Class specific requests */
 143         switch (USB_ControlRequest.bRequest)
 144         {
 145                 case REQ_GetReport:
 146                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 147                         {
 148                                 USB_KeyboardReport_Data_t KeyboardReportData;
 149
 150                                 Endpoint_ClearSETUP();
 151
 152                                 /* Create the next keyboard report for transmission to the host */
 153                                 CreateKeyboardReport(&KeyboardReportData);
 154
 155                                 /* Write the report data to the control endpoint */
 156                                 Endpoint_Write_Control_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
 157
 158                                 /* Finalize the stream transfer to send the last packet or clear the host abort */
 159                                 Endpoint_ClearOUT();
 160                         }
 161
 162                         break;
 163                 case REQ_SetReport:
 164                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 165                         {
 166                                 Endpoint_ClearSETUP();
 167
 168                                 /* Wait until the LED report has been sent by the host */
 169                                 while (!(Endpoint_IsOUTReceived()));
 170
 171                                 /* Read in the LED report from the host */
 172                                 uint8_t LEDStatus = Endpoint_Read_Byte();
 173
 174                                 /* Process the incoming LED report */
 175                                 ProcessLEDReport(LEDStatus);
 176
 177                                 /* Clear the endpoint data */
 178                                 Endpoint_ClearOUT();
 179
 180                                 /* Acknowledge status stage */
 181                                 while (!(Endpoint_IsINReady()));
 182                                 Endpoint_ClearIN();
 183                         }
 184
 185                         break;
 186                 case REQ_GetProtocol:
 187                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 188                         {
 189                                 Endpoint_ClearSETUP();
 190
 191                                 /* Write the current protocol flag to the host */
 192                                 Endpoint_Write_Byte(UsingReportProtocol);
 193
 194                                 /* Send the flag to the host */
 195                                 Endpoint_ClearIN();
 196
 197                                 /* Acknowledge status stage */
 198                                 while (!(Endpoint_IsOUTReceived()));
 199                                 Endpoint_ClearOUT();
 200                         }
 201
 202                         break;
 203                 case REQ_SetProtocol:
 204                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 205                         {
 206                                 Endpoint_ClearSETUP();
 207
 208                                 /* Set or clear the flag depending on what the host indicates that the current Protocol should be */
 209                                 UsingReportProtocol = (USB_ControlRequest.wValue != 0);
 210
 211                                 /* Acknowledge status stage */
 212                                 while (!(Endpoint_IsINReady()));
 213                                 Endpoint_ClearIN();
 214                         }
 215
 216                         break;
 217                 case REQ_SetIdle:
 218                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 219                         {
 220                                 Endpoint_ClearSETUP();
 221
 222                                 /* Get idle period in MSB */
 223                                 IdleCount = (USB_ControlRequest.wValue >> 8);
 224
 225                                 /* Acknowledge status stage */
 226                                 while (!(Endpoint_IsINReady()));
 227                                 Endpoint_ClearIN();
 228                         }
 229
 230                         break;
 231                 case REQ_GetIdle:
 232                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 233                         {
 234                                 Endpoint_ClearSETUP();
 235
 236                                 /* Write the current idle duration to the host */
 237                                 Endpoint_Write_Byte(IdleCount);
 238
 239                                 /* Send the flag to the host */
 240                                 Endpoint_ClearIN();
 241
 242                                 /* Acknowledge status stage */
 243                                 while (!(Endpoint_IsOUTReceived()));
 244                                 Endpoint_ClearOUT();
 245                         }
 246
 247                         break;
 248         }
 249 }
 250
 251 /** ISR for the timer 0 compare vector. This ISR fires once each millisecond, and increments the
 252  *  scheduler elapsed idle period counter when the host has set an idle period.
 253  */
 254 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 255 {
 256         /* One millisecond has elapsed, decrement the idle time remaining counter if it has not already elapsed */
 257         if (IdleMSRemaining)
 258           IdleMSRemaining--;
 259 }
 260
 261 /** Fills the given HID report data structure with the next HID report to send to the host.
 262  *
 263  *  \param ReportData  Pointer to a HID report data structure to be filled
 264  */
 265 void CreateKeyboardReport(USB_KeyboardReport_Data_t* ReportData)
 266 {
 267         uint8_t JoyStatus_LCL = Joystick_GetStatus();
 268
 269         /* Clear the report contents */
 270         memset(ReportData, 0, sizeof(USB_KeyboardReport_Data_t));
 271
 272         if (JoyStatus_LCL & JOY_UP)
 273           ReportData->KeyCode[0] = 0x04; // A
 274         else if (JoyStatus_LCL & JOY_DOWN)
 275           ReportData->KeyCode[0] = 0x05; // B
 276
 277         if (JoyStatus_LCL & JOY_LEFT)
 278           ReportData->KeyCode[0] = 0x06; // C
 279         else if (JoyStatus_LCL & JOY_RIGHT)
 280           ReportData->KeyCode[0] = 0x07; // D
 281
 282         if (JoyStatus_LCL & JOY_PRESS)
 283           ReportData->KeyCode[0] = 0x08; // E
 284 }
 285
 286 /** Processes a received LED report, and updates the board LEDs states to match.
 287  *
 288  *  \param LEDReport  LED status report from the host
 289  */
 290 void ProcessLEDReport(uint8_t LEDReport)
 291 {
 292         uint8_t LEDMask = LEDS_LED2;
 293
 294         if (LEDReport & 0x01) // NUM Lock
 295           LEDMask |= LEDS_LED1;
 296
 297         if (LEDReport & 0x02) // CAPS Lock
 298           LEDMask |= LEDS_LED3;
 299
 300         if (LEDReport & 0x04) // SCROLL Lock
 301           LEDMask |= LEDS_LED4;
 302
 303         /* Set the status LEDs to the current Keyboard LED status */
 304         LEDs_SetAllLEDs(LEDMask);
 305 }
 306
 307 /** Sends the next HID report to the host, via the keyboard data endpoint. */
 308 void SendNextReport(void)
 309 {
 310         static USB_KeyboardReport_Data_t PrevKeyboardReportData;
 311         USB_KeyboardReport_Data_t        KeyboardReportData;
 312         bool                             SendReport = true;
 313
 314         /* Create the next keyboard report for transmission to the host */
 315         CreateKeyboardReport(&KeyboardReportData);
 316
 317         /* Check to see if the report data has changed - if so a report MUST be sent */
 318         SendReport = (memcmp(&PrevKeyboardReportData, &KeyboardReportData, sizeof(USB_KeyboardReport_Data_t)) != 0);
 319
 320         /* Save the current report data for later comparison to check for changes */
 321         PrevKeyboardReportData = KeyboardReportData;
 322
 323         /* Check if the idle period is set and has elapsed */
 324         if ((IdleCount != HID_IDLE_CHANGESONLY) && (!(IdleMSRemaining)))
 325         {
 326                 /* Reset the idle time remaining counter, must multiply by 4 to get the duration in milliseconds */
 327                 IdleMSRemaining = (IdleCount << 2);
 328
 329                 /* Idle period is set and has elapsed, must send a report to the host */
 330                 SendReport = true;
 331         }
 332
 333         /* Select the Keyboard Report Endpoint */
 334         Endpoint_SelectEndpoint(KEYBOARD_EPNUM);
 335
 336         /* Check if Keyboard Endpoint Ready for Read/Write and if we should send a new report */
 337         if (Endpoint_IsReadWriteAllowed() && SendReport)
 338         {
 339                 /* Write Keyboard Report Data */
 340                 Endpoint_Write_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
 341
 342                 /* Finalize the stream transfer to send the last packet */
 343                 Endpoint_ClearIN();
 344         }
 345 }
 346
 347 /** Reads the next LED status report from the host from the LED data endpoint, if one has been sent. */
 348 void ReceiveNextReport(void)
 349 {
 350         /* Select the Keyboard LED Report Endpoint */
 351         Endpoint_SelectEndpoint(KEYBOARD_LEDS_EPNUM);
 352
 353         /* Check if Keyboard LED Endpoint contains a packet */
 354         if (Endpoint_IsOUTReceived())
 355         {
 356                 /* Check to see if the packet contains data */
 357                 if (Endpoint_IsReadWriteAllowed())
 358                 {
 359                         /* Read in the LED report from the host */
 360                         uint8_t LEDReport = Endpoint_Read_Byte();
 361
 362                         /* Process the read LED report from the host */
 363                         ProcessLEDReport(LEDReport);
 364                 }
 365
 366                 /* Handshake the OUT Endpoint - clear endpoint and ready for next report */
 367                 Endpoint_ClearOUT();
 368         }
 369 }
 370
 371 /** Function to manage HID report generation and transmission to the host, when in report mode. */
 372 void HID_Task(void)
 373 {
 374         /* Check if the USB system is connected to a host */
 375         if (USB_IsConnected)
 376         {
 377                 /* Send the next keypress report to the host */
 378                 SendNextReport();
 379
 380                 /* Process the LED report sent from the host */
 381                 ReceiveNextReport();
 382         }
 383 }