1 files changed, 33 insertions, 1 deletions
diff --git a/Demos/Device/Keyboard/Keyboard.c b/Demos/Device/Keyboard/Keyboard.c
index d506657a6..923dd7176 100644
--- a/Demos/Device/Keyboard/Keyboard.c
+++ b/Demos/Device/Keyboard/Keyboard.c
@@ -28,9 +28,19 @@
   arising out of or in connection with the use or performance of
   this software.
 */
- 
+
+/** \file
+ *
+ *  Main source file for the Keyboard demo. This file contains the main tasks of
+ *  the demo and is responsible for the initial application hardware configuration.
+ */
+
 #include "Keyboard.h"
 
+/** LUFA HID Class driver interface configuration and state information. This structure is
+ *  passed to all HID Class driver functions, so that multiple instances of the same class
+ *  within a device can be differentiated from one another.
+ */
 USB_ClassInfo_HID_t Keyboard_HID_Interface =
     {
         .InterfaceNumber         = 0,
@@ -46,6 +56,9 @@ USB_ClassInfo_HID_t Keyboard_HID_Interface =
         .IdleCount               = 500,
     };
 
+/** Main program entry point. This routine contains the overall program flow, including initial
+ *  setup of all components and the main program loop.
+ */
 int main(void)
 {
     SetupHardware();
@@ -59,6 +72,7 @@ int main(void)
     }
 }
 
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
 void SetupHardware()
 {
     /* Disable watchdog if enabled by bootloader/fuses */
@@ -81,16 +95,19 @@ void SetupHardware()
 	TIMSK0 = (1 << OCIE0A);
 }
 
+/** Event handler for the library USB Connection event. */
 void EVENT_USB_Connect(void)
 {
     LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 }
 
+/** Event handler for the library USB Disconnection event. */
 void EVENT_USB_Disconnect(void)
 {
     LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 }
 
+/** Event handler for the library USB Configuration Changed event. */
 void EVENT_USB_ConfigurationChanged(void)
 {
     LEDs_SetAllLEDs(LEDMASK_USB_READY);
@@ -99,17 +116,26 @@ void EVENT_USB_ConfigurationChanged(void)
       LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 }
 
+/** Event handler for the library USB Unhandled Control Packet event. */
 void EVENT_USB_UnhandledControlPacket(void)
 {
     USB_HID_ProcessControlPacket(&Keyboard_HID_Interface);
 }
 
+/** ISR to keep track of each millisecond interrupt, for determining the HID class idle period remaining when set. */
 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 {
 	if (Keyboard_HID_Interface.IdleMSRemaining)
 	  Keyboard_HID_Interface.IdleMSRemaining--;
 }
 
+/** HID class driver callback function for the creation of HID reports to the host.
+ *
+ *  \param HIDInterfaceInfo  Pointer to the HID class interface configuration structure being referenced
+ *  \param ReportData  Pointer to a buffer where the created report should be stored
+ *
+ *  \return Number of bytes written in the report (or zero if no report is to be sent
+ */
 uint16_t CALLBACK_USB_HID_CreateNextHIDReport(USB_ClassInfo_HID_t* HIDInterfaceInfo, void* ReportData)
 {
     USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;
@@ -136,6 +162,12 @@ uint16_t CALLBACK_USB_HID_CreateNextHIDReport(USB_ClassInfo_HID_t* HIDInterfaceI
     return sizeof(USB_KeyboardReport_Data_t);
 }
 
+/** HID class driver callback function for the processing of HID reports from the host.
+ *
+ *  \param HIDInterfaceInfo  Pointer to the HID class interface configuration structure being referenced
+ *  \param ReportData  Pointer to a buffer where the created report has been stored
+ *  \param ReportSize  Size in bytes of the received HID report
+ */
 void CALLBACK_USB_HID_ProcessReceivedHIDReport(USB_ClassInfo_HID_t* HIDInterfaceInfo, void* ReportData, uint16_t ReportSize)
 {
     uint8_t  LEDMask   = LEDS_NO_LEDS;