Fix accidentally changed code breaking the HID descriptor parser.

[pub/USBasp.git] / Projects / Magstripe / Magstripe.c

diff --git a/Projects/Magstripe/Magstripe.c b/Projects/Magstripe/Magstripe.c
index 94eed31..7b3f0be 100644 (file)
--- a/Projects/Magstripe/Magstripe.c
+++ b/Projects/Magstripe/Magstripe.c
@@ -28,60 +28,66 @@
   arising out of or in connection with the use or performance of\r
   this software.\r
 */\r
   arising out of or in connection with the use or performance of\r
   this software.\r
 */\r

-\r
+ \r

 /** \file\r
  *\r
 /** \file\r
  *\r

- *  Main source file for the MagStripe application. This file contains the code which drives\r
- *  the USB keyboard interface from the magnetic card stripe reader device.\r
+ *  Main source file for the MagStripe reader program. This file contains the main tasks of\r
+ *  the project and is responsible for the initial application hardware configuration.\r

  */\r
  \r
 #include "Magstripe.h"\r
 \r
  */\r
  \r
 #include "Magstripe.h"\r
 \r

-/* Scheduler Task List */\r
-TASK_LIST\r
-{\r
-       { .Task = USB_USBTask          , .TaskStatus = TASK_STOP },\r
-       { .Task = USB_Keyboard_Report  , .TaskStatus = TASK_STOP },\r
-       { .Task = Magstripe_Read       , .TaskStatus = TASK_STOP },\r
-};\r
-\r
-/* Global Variables */\r
-/** Indicates if the device is using Report Protocol mode, instead of Boot Protocol mode. Boot Protocol mode\r
- *  is a special reporting mode used by compatible PC BIOS to support USB keyboards before a full OS and USB\r
- *  driver has been loaded, by using predefined report structures indicated in the USB HID standard.\r
+/** Bit buffers to hold the read bits for each of the three magnetic card tracks before they are transmitted\r
+ *  to the host as keyboard presses.\r

  */\r
  */\r

-bool UsingReportProtocol = true;\r
+BitBuffer_t TrackDataBuffers[TOTAL_TRACKS];\r

 \r
 \r

-/** Total idle period in milliseconds set by the host via a SetIdle request, used to silence the report endpoint\r
- *  until the report data changes or the idle period elapsed. Generally used to implement hardware key repeats, or\r
- *  by some BIOS to reduce the number of reports when in Boot Protocol mode.\r
- */\r
-uint8_t IdleCount = 0;\r
+/** Pointer to the current track buffer being sent to the host. */\r
+BitBuffer_t* CurrentTrackBuffer = &TrackDataBuffers[TOTAL_TRACKS];\r

 \r
 \r

-/** Milliseconds remaining counter for the HID class SetIdle and GetIdle requests, used to silence the report\r
- *  endpoint for an amount of time indicated by the host or until the report changes.\r
- */\r
-uint16_t IdleMSRemaining = 0;\r
+/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */\r
+uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)];\r

 \r
 \r

-/** Circular buffer to hold the read bits from track 1 of the inserted magnetic card. */\r
-BitBuffer_t Track1Data;\r
+/** LUFA HID Class driver interface configuration and state information. This structure is\r
+ *  passed to all HID Class driver functions, so that multiple instances of the same class\r
+ *  within a device can be differentiated from one another.\r
+ */\r
+USB_ClassInfo_HID_Device_t Keyboard_HID_Interface =\r
+       {\r
+               .Config =\r
+                       {\r
+                               .InterfaceNumber         = 0,\r

 \r
 \r

-/** Circular buffer to hold the read bits from track 2 of the inserted magnetic card. */\r
-BitBuffer_t Track2Data;\r
+                               .ReportINEndpointNumber  = KEYBOARD_EPNUM,\r
+                               .ReportINEndpointSize    = KEYBOARD_EPSIZE,\r

 \r
 \r

-/** Circular buffer to hold the read bits from track 3 of the inserted magnetic card. */\r
-BitBuffer_t Track3Data;\r
+                               .PrevReportINBuffer      = PrevKeyboardHIDReportBuffer,\r
+                               .PrevReportINBufferSize  = sizeof(PrevKeyboardHIDReportBuffer),\r
+                       },\r
+       };\r

 \r
 \r

-/** Delay counter between successive key strokes. This is to prevent the OS from ignoring multiple keys in a short\r
- *  period of time due to key repeats. Two milliseconds works for most OSes.\r
+/** Main program entry point. This routine contains the overall program flow, including initial\r
+ *  setup of all components and the main program loop.\r

  */\r
  */\r

-uint8_t KeyDelayRemaining;\r
+int main(void)\r
+{\r
+       SetupHardware();\r
+       \r
+       for (uint8_t Buffer = 0; Buffer < TOTAL_TRACKS; Buffer++)\r
+         BitBuffer_Init(&TrackDataBuffers[Buffer]);\r

 \r
 \r

+       for (;;)\r
+       {\r
+               if (Magstripe_GetStatus() & MAG_CARDPRESENT)\r
+                 ReadMagstripeData();\r

 \r
 \r

-/** Main program entry point. This routine configures the hardware required by the application, then\r
- *  starts the scheduler to run the application tasks.\r
- */\r
-int main(void)\r
+               HID_Device_USBTask(&Keyboard_HID_Interface);\r
+               USB_USBTask();\r
+       }\r
+}\r
+\r
+/** Configures the board hardware and chip peripherals for the demo's functionality. */\r
+void SetupHardware(void)\r

 {\r
        /* Disable watchdog if enabled by bootloader/fuses */\r
        MCUSR &= ~(1 << WDRF);\r
 {\r
        /* Disable watchdog if enabled by bootloader/fuses */\r
        MCUSR &= ~(1 << WDRF);\r


@@ -92,349 +98,115 @@ int main(void)
 \r
        /* Hardware Initialization */\r
        Magstripe_Init();\r
 \r
        /* Hardware Initialization */\r
        Magstripe_Init();\r

-       \r
-       /* Buffer Initialization */\r
-       BitBuffer_Init(&Track1Data);\r
-       BitBuffer_Init(&Track2Data);\r
-       BitBuffer_Init(&Track3Data);\r
-       \r
-       /* Millisecond timer initialization, with output compare interrupt enabled for the idle timing */\r
-       OCR0A  = 0xFA;\r
-       TCCR0A = (1 << WGM01);\r
-       TCCR0B = ((1 << CS01) | (1 << CS00));\r
-       TIMSK0 = (1 << OCIE0A);\r
-       \r
-       /* Initialize Scheduler so that it can be used */\r
-       Scheduler_Init();\r
-\r
-       /* Initialize USB Subsystem */\r

        USB_Init();\r
        USB_Init();\r

-       \r
-       /* Scheduling - routine never returns, so put this last in the main function */\r
-       Scheduler_Start();\r
-}\r
-\r
-/** Event handler for the USB_Connect event. This starts the USB task. */\r
-EVENT_HANDLER(USB_Connect)\r
-{\r
-       /* Start USB management task */\r
-       Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);\r
-}\r
-\r
-/** Event handler for the USB_Disconnect event. This stops the USB and keyboard report tasks. */\r
-EVENT_HANDLER(USB_Disconnect)\r
-{\r
-       /* Stop running keyboard reporting, card reading and USB management tasks */\r
-       Scheduler_SetTaskMode(USB_Keyboard_Report, TASK_STOP);\r
-       Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);\r
-       Scheduler_SetTaskMode(Magstripe_Read, TASK_STOP);\r
-}\r
-\r
-/** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready\r
- *  to relay reports to the host, and starts the keyboard report task.\r
- */\r
-EVENT_HANDLER(USB_ConfigurationChanged)\r
-{\r
-       /* Setup Keyboard Keycode Report Endpoint */\r
-       Endpoint_ConfigureEndpoint(KEYBOARD_EPNUM, EP_TYPE_INTERRUPT,\r
-                                      ENDPOINT_DIR_IN, KEYBOARD_EPSIZE,\r
-                                  ENDPOINT_BANK_SINGLE);\r
-       \r
-       /* Default to report protocol on connect */\r
-       UsingReportProtocol = true;\r
-\r
-       /* Start Keyboard reporting and card reading tasks */\r
-       Scheduler_SetTaskMode(USB_Keyboard_Report, TASK_RUN);\r
-       Scheduler_SetTaskMode(Magstripe_Read, TASK_RUN);\r

 }\r
 \r
 }\r
 \r

-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific\r
- *  control requests that are not handled internally by the USB library, so that they can be handled appropriately\r
- *  for the application.\r
+/** Determines if a card has been inserted, and if so reads in each track's contents into the bit buffers\r
+ *  until they are read out to the host as a series of keyboard presses.\r

  */\r
  */\r

-EVENT_HANDLER(USB_UnhandledControlPacket)\r
+void ReadMagstripeData(void)\r

 {\r
 {\r

-       /* Handle HID Class specific requests */\r
-       switch (bRequest)\r
+       /* Arrays to hold the buffer pointers, clock and data bit masks for the separate card tracks */\r
+       const struct\r

        {\r
        {\r

-               case REQ_GetReport:\r
-                       if (bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))\r
-                       {\r
-                               USB_KeyboardReport_Data_t KeyboardReportData;\r
+               uint8_t ClockMask;\r
+               uint8_t DataMask;       \r
+       } TrackInfo[] = {{MAG_T1_CLOCK, MAG_T1_DATA},\r
+                        {MAG_T2_CLOCK, MAG_T2_DATA},\r
+                        {MAG_T3_CLOCK, MAG_T3_DATA}};\r

 \r
 \r

-                               /* Create the next keyboard report for transmission to the host */\r
-                               GetNextReport(&KeyboardReportData);\r
-\r
-                               /* Ignore report type and ID number value */\r
-                               Endpoint_Discard_Word();\r
-                               \r
-                               /* Ignore unused Interface number value */\r
-                               Endpoint_Discard_Word();\r
-\r
-                               /* Read in the number of bytes in the report to send to the host */\r
-                               uint16_t wLength = Endpoint_Read_Word_LE();\r
-                               \r
-                               /* If trying to send more bytes than exist to the host, clamp the value at the report size */\r
-                               if (wLength > sizeof(KeyboardReportData))\r
-                                 wLength = sizeof(KeyboardReportData);\r
+       uint8_t Magstripe_Prev = 0;\r
+       uint8_t Magstripe_LCL  = Magstripe_GetStatus();\r

 \r
 \r

-                               Endpoint_ClearSETUP();\r
-       \r
-                               /* Write the report data to the control endpoint */\r
-                               Endpoint_Write_Control_Stream_LE(&KeyboardReportData, wLength);\r
-                               \r
-                               /* Finalize the stream transfer to send the last packet or clear the host abort */\r
-                               Endpoint_ClearOUT();\r
-                       }\r
+       while (Magstripe_LCL & MAG_CARDPRESENT)\r
+       {\r
+               for (uint8_t Track = 0; Track < TOTAL_TRACKS; Track++)\r
+               {\r
+                       bool DataPinLevel      = ((Magstripe_LCL & TrackInfo[Track].DataMask) != 0);\r
+                       bool ClockPinLevel     = ((Magstripe_LCL & TrackInfo[Track].ClockMask) != 0);\r
+                       bool ClockLevelChanged = (((Magstripe_LCL ^ Magstripe_Prev) & TrackInfo[Track].ClockMask) != 0);\r

                \r
                \r

-                       break;\r
-               case REQ_GetProtocol:\r
-                       if (bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))\r
-                       {\r
-                               Endpoint_ClearSETUP();\r
-                               \r
-                               /* Write the current protocol flag to the host */\r
-                               Endpoint_Write_Byte(UsingReportProtocol);\r
-                               \r
-                               /* Send the flag to the host */\r
-                               Endpoint_ClearIN();\r
-\r
-                               /* Acknowledge status stage */\r
-                               while (!(Endpoint_IsOUTReceived()));\r
-                               Endpoint_ClearOUT();\r
-                       }\r
-                       \r
-                       break;\r
-               case REQ_SetProtocol:\r
-                       if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))\r
-                       {\r
-                               /* Read in the wValue parameter containing the new protocol mode */\r
-                               uint16_t wValue = Endpoint_Read_Word_LE();\r
-                               \r
-                               Endpoint_ClearSETUP();\r
+                       /* Sample data on rising clock edges from the card reader */\r
+                       if (ClockPinLevel && ClockLevelChanged)\r
+                         BitBuffer_StoreNextBit(&TrackDataBuffers[Track], DataPinLevel);\r
+               }\r

 \r
 \r

-                               /* Set or clear the flag depending on what the host indicates that the current Protocol should be */\r
-                               UsingReportProtocol = (wValue != 0x0000);\r
-                               \r
-                               /* Acknowledge status stage */\r
-                               while (!(Endpoint_IsINReady()));\r
-                               Endpoint_ClearIN();\r
-                       }\r
-                       \r
-                       break;\r
-               case REQ_SetIdle:\r
-                       if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))\r
-                       {\r
-                               /* Read in the wValue parameter containing the idle period */\r
-                               uint16_t wValue = Endpoint_Read_Word_LE();\r
-                               \r
-                               Endpoint_ClearSETUP();\r
-                               \r
-                               /* Get idle period in MSB */\r
-                               IdleCount = (wValue >> 8);\r
-                               \r
-                               /* Acknowledge status stage */\r
-                               while (!(Endpoint_IsINReady()));\r
-                               Endpoint_ClearIN();\r
-                       }\r
-                       \r
-                       break;\r
-               case REQ_GetIdle:\r
-                       if (bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))\r
-                       {               \r
-                               Endpoint_ClearSETUP();\r
-                               \r
-                               /* Write the current idle duration to the host */\r
-                               Endpoint_Write_Byte(IdleCount);\r
-                               \r
-                               /* Send the flag to the host */\r
-                               Endpoint_ClearIN();\r
+               Magstripe_Prev = Magstripe_LCL;\r
+               Magstripe_LCL  = Magstripe_GetStatus();\r
+       }\r
+       \r
+       CurrentTrackBuffer = &TrackDataBuffers[0];\r
+}\r

 \r
 \r

-                               /* Acknowledge status stage */\r
-                               while (!(Endpoint_IsOUTReceived()));\r
-                               Endpoint_ClearOUT();\r
-                       }\r
+/** Event handler for the library USB Configuration Changed event. */\r
+void EVENT_USB_Device_ConfigurationChanged(void)\r
+{\r
+       HID_Device_ConfigureEndpoints(&Keyboard_HID_Interface);\r
+       \r
+       USB_Device_EnableSOFEvents();\r
+}\r

 \r
 \r

-                       break;\r
-       }\r
+/** Event handler for the library USB Unhandled Control Packet event. */\r
+void EVENT_USB_Device_UnhandledControlRequest(void)\r
+{\r
+       HID_Device_ProcessControlRequest(&Keyboard_HID_Interface);\r

 }\r
 \r
 }\r
 \r

-/** ISR for the timer 0 compare vector. This ISR fires once each millisecond, and decrements the counter indicating\r
- *  the number of milliseconds left to idle (not send the host reports) if the device has been instructed to idle\r
- *  by the host via a SetIdle class specific request.\r
- */\r
-ISR(TIMER0_COMPA_vect, ISR_BLOCK)\r
+/** Event handler for the USB device Start Of Frame event. */\r
+void EVENT_USB_Device_StartOfFrame(void)\r

 {\r
 {\r

-       /* One millisecond has elapsed, decrement the idle time remaining counter if it has not already elapsed */\r
-       if (IdleMSRemaining)\r
-         IdleMSRemaining--;\r
-         \r
-       if (KeyDelayRemaining)\r
-         KeyDelayRemaining--;\r
+       HID_Device_MillisecondElapsed(&Keyboard_HID_Interface);\r

 }\r
 \r
 }\r
 \r

-/** Constructs a keyboard report indicating the currently pressed keyboard keys to the host.\r
+/** HID class driver callback function for the creation of HID reports to the host.\r

  *\r
  *\r

- *  \param ReportData  Pointer to a USB_KeyboardReport_Data_t report structure where the resulting report should\r
- *                     be stored\r
+ *  \param[in] HIDInterfaceInfo  Pointer to the HID class interface configuration structure being referenced\r
+ *  \param[in,out] ReportID  Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID\r
+ *  \param[out] ReportData  Pointer to a buffer where the created report should be stored\r
+ *  \param[out] ReportSize  Number of bytes written in the report (or zero if no report is to be sent\r

  *\r
  *\r

- *  \return Boolean true if the current report is different to the previous report, false otherwise\r
+ *  \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent\r

  */\r
  */\r

-bool GetNextReport(USB_KeyboardReport_Data_t* ReportData)\r
+bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID,\r
+                                         void* ReportData, uint16_t* ReportSize)\r

 {\r
 {\r

-       static bool OddReport   = false;\r
-       static bool MustRelease = false;\r
-       \r
-       BitBuffer_t* Buffer     = NULL;\r
+       USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;\r

 \r
 \r

-       /* Clear the report contents */\r
-       memset(ReportData, 0, sizeof(USB_KeyboardReport_Data_t));\r
+       static bool IsKeyReleaseReport;\r

 \r
 \r

-       /* Get the next non-empty track data buffer */\r
-       if (Track1Data.Elements)\r
-         Buffer = &Track1Data;\r
-       else if (Track2Data.Elements)\r
-         Buffer = &Track2Data;                 \r
-       else if (Track3Data.Elements)\r
-         Buffer = &Track3Data;\r
+       /* Key reports must be interleaved with key release reports, or repeated keys will be ignored */\r
+       IsKeyReleaseReport = !IsKeyReleaseReport;\r

 \r
 \r

-       if (Buffer != NULL)\r
+       if ((IsKeyReleaseReport) || (CurrentTrackBuffer == &TrackDataBuffers[TOTAL_TRACKS]))\r

        {\r
        {\r

-               /* Toggle the odd report number indicator */\r
-               OddReport   = !OddReport;\r
-               \r
-               /* Set the flag indicating that a null report must eventually be sent to release all pressed keys */\r
-               MustRelease = true;\r
-\r
-               /* Only send the next key on odd reports, so that they are interspersed with null reports to release keys */\r
-               if (OddReport)\r
-               {\r
-                       /* Set the report key code to the key code for the next data bit */\r
-                       ReportData->KeyCode = BitBuffer_GetNextBit(Buffer) ? KEY_1 : KEY_0;\r
-                       \r
-                       /* If buffer is now empty, a new line must be sent instead of the terminating bit */\r
-                       if (!(Buffer->Elements))\r
-                       {\r
-                               /* Set the keycode to the code for an enter key press */\r
-                               ReportData->KeyCode = KEY_ENTER;                                \r
-                       }\r
-               }\r
-\r
-               return true;\r
+               /* No more data to send, or key release report between key presses */\r
+               KeyboardReport->KeyCode[0] = KEY_NONE;\r

        }\r
        }\r

-       else if (MustRelease)\r
+       else if (!(CurrentTrackBuffer->Elements))\r

        {\r
        {\r

-               /* Leave key code to null (0), to release all pressed keys */\r
-               return true;\r
+               /* End of current track, send an enter press and change to the next track's buffer */\r
+               KeyboardReport->KeyCode[0] = KEY_ENTER;\r
+               CurrentTrackBuffer++;\r

        }\r
        }\r

-       \r
-       return false;\r
-}\r
-\r
-/** Task to read out data from inserted magnetic cards and place the separate track data into their respective\r
- *  data buffers for later sending to the host as keyboard key presses.\r
- */\r
-TASK(Magstripe_Read)\r
-{\r
-       /* Arrays to hold the buffer pointers, clock and data bit masks for the separate card tracks */\r
-       const struct\r
-       {\r
-               BitBuffer_t* Buffer;\r
-               uint8_t      ClockMask;\r
-               uint8_t      DataMask;  \r
-       } TrackInfo[] = {{&Track1Data, MAG_T1_CLOCK, MAG_T1_DATA},\r
-                        {&Track2Data, MAG_T2_CLOCK, MAG_T2_DATA},\r
-                        {&Track3Data, MAG_T3_CLOCK, MAG_T3_DATA}};\r
-\r
-       /* Previous magnetic card control line' status, for later comparison */\r
-       uint8_t Magstripe_Prev = 0;\r
-       \r
-       /* Buffered current card reader control line' status */\r
-       uint8_t Magstripe_LCL  = Magstripe_GetStatus();\r
-\r
-       /* Exit the task early if no card is present in the reader */\r
-       if (!(Magstripe_LCL & MAG_CARDPRESENT))\r
-         return;\r
-\r
-       /* Read out card data while a card is present */\r
-       while (Magstripe_LCL & MAG_CARDPRESENT)\r
+       else\r

        {\r
        {\r

-               /* Read out the next bit for each track of the card */\r
-               for (uint8_t Track = 0; Track < 3; Track++)\r
-               {\r
-                       /* Current data line status for the current card track */\r
-                       bool DataLevel    = ((Magstripe_LCL & TrackInfo[Track].DataMask) != 0);\r
-\r
-                       /* Current clock line status for the current card track */\r
-                       bool ClockLevel   = ((Magstripe_LCL & TrackInfo[Track].ClockMask) != 0);\r
-\r
-                       /* Current track clock transition check */\r
-                       bool ClockChanged = (((Magstripe_LCL ^ Magstripe_Prev) & TrackInfo[Track].ClockMask) != 0);\r
-               \r
-                       /* Sample the next bit on the falling edge of the track's clock line, store key code into the track's buffer */\r
-                       if (ClockLevel && ClockChanged)\r
-                         BitBuffer_StoreNextBit(TrackInfo[Track].Buffer, DataLevel);\r
-               }\r
-\r
-               /* Retain the current card reader control line states for later edge detection */\r
-               Magstripe_Prev = Magstripe_LCL;\r
-               \r
-               /* Retrieve the new card reader control line states */\r
-               Magstripe_LCL  = Magstripe_GetStatus();\r
+               /* Still data in the current track; convert next bit to a 1 or 0 keypress */\r
+               KeyboardReport->KeyCode[0] = BitBuffer_GetNextBit(CurrentTrackBuffer) ? KEY_1 : KEY_0;\r

        }\r
        \r
        }\r
        \r

-       /* Add terminators to the end of each track buffer */\r
-       BitBuffer_StoreNextBit(&Track1Data, 0);\r
-       BitBuffer_StoreNextBit(&Track2Data, 0);\r
-       BitBuffer_StoreNextBit(&Track3Data, 0);\r
+       *ReportSize = sizeof(USB_KeyboardReport_Data_t);\r
+       return false;\r

 }\r
 \r
 }\r
 \r

-/** Task for the magnetic card reading and keyboard report generation. This task waits until a card is inserted,\r
- *  then reads off the card data and sends it to the host as a series of keyboard key presses via keyboard reports.\r
+/** HID Class driver callback function for the processing of a received HID report from the host.\r
+ *\r
+ *  \param[in] HIDInterfaceInfo  Pointer to the HID interface structure for the HID interface being referenced\r
+ *  \param[in] ReportID          Report ID of the received report from the host\r
+ *  \param[in] ReportData        Pointer to the report buffer where the received report is stored\r
+ *  \param[in] ReportSize        Size in bytes of the report received from the host\r

  */\r
  */\r

-TASK(USB_Keyboard_Report)\r
+void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID,\r
+                                          const void* ReportData, const uint16_t ReportSize)\r

 {\r
 {\r

-       USB_KeyboardReport_Data_t KeyboardReportData;\r
-       bool                      SendReport = false;\r
-       \r
-       /* Check if the USB system is connected to a host */\r
-       if (USB_IsConnected)\r
-       {\r
-               /* Select the Keyboard Report Endpoint */\r
-               Endpoint_SelectEndpoint(KEYBOARD_EPNUM);\r
-\r
-               /* Check if Keyboard Endpoint Ready for Read/Write */\r
-               if (Endpoint_IsReadWriteAllowed())\r
-               {\r
-                       /* Only fetch the next key to send once the period between key presses has elapsed */\r
-                       if (!(KeyDelayRemaining))\r
-                       {\r
-                               /* Create the next keyboard report for transmission to the host */\r
-                               SendReport = GetNextReport(&KeyboardReportData);\r
-                       }\r
-                       \r
-                       /* Check if the idle period is set and has elapsed */\r
-                       if (IdleCount && !(IdleMSRemaining))\r
-                       {\r
-                               /* Idle period elapsed, indicate that a report must be sent */\r
-                               SendReport = true;\r
-                               \r
-                               /* Reset the idle time remaining counter, must multiply by 4 to get the duration in milliseconds */\r
-                               IdleMSRemaining = (IdleCount << 2);\r
-                       }\r
-\r
-                       /* Write the keyboard report if a report is to be sent to the host */\r
-                       if (SendReport)\r
-                       {\r
-                               /* Write Keyboard Report Data */\r
-                               Endpoint_Write_Stream_LE(&KeyboardReportData, sizeof(USB_KeyboardReport_Data_t));\r
-\r
-                               /* Finalize the stream transfer to send the last packet */\r
-                               Endpoint_ClearIN();\r
-\r
-                               /* Reset the key delay period counter */\r
-                               KeyDelayRemaining = 2;\r
-                       }\r
-               }\r
-       }\r
+       // Unused (but mandatory for the HID class driver) in this demo, since there are no Host->Device reports\r

 }\r
 }\r