/** \file
 *
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/** \mainpage HID Class USB AVR Bootloader
 *
 *  \section SSec_Compat Demo Compatibility:
 *
 *  The following list indicates what microcontrollers are compatible with this demo.
 *
 *  \li Series 7 USB AVRs (AT90USBxxx7)
 *  \li Series 6 USB AVRs (AT90USBxxx6)
 *  \li Series 4 USB AVRs (ATMEGAxxU4)
 *  \li Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2)
 *
 *  \section SSec_Info USB Information:
 *
 *  The following table gives a rundown of the USB utilization of this demo.
 *
 * <table>
 *  <tr>
 *   <td><b>USB Mode:</b></td>
 *   <td>Device</td>
 *  </tr>
 *  <tr>
 *   <td><b>USB Class:</b></td>
 *   <td>Human Interface Device Class (HID)</td>
 *  </tr>
 *  <tr>
 *   <td><b>USB Subclass:</b></td>
 *   <td>N/A</td>
 *  </tr>
 *  <tr>
 *   <td><b>Relevant Standards:</b></td>
 *   <td>USBIF HID Class Standard \n
 *       Teensy Programming Protocol Specification</td>
 *  </tr>
 *  <tr>
 *   <td><b>Supported USB Speeds:</b></td>
 *   <td>Low Speed Mode \n
 *       Full Speed Mode</td>
 *  </tr>
 * </table>
 *
 *  \section SSec_Description Project Description:
 *
 *  This bootloader enumerates to the host as a HID Class device, allowing for device FLASH programming through
 *  the supplied command line software, which is a modified version of Paul's TeensyHID Command Line loader code
 *  from PJRC (used with permission). This bootloader is deliberately non-compatible with the proprietary PJRC
 *  HalfKay bootloader GUI; only the command line interface software accompanying this bootloader will work with it.
 *
 *  Out of the box this bootloader builds for the AT90USB1287 with an 8KB bootloader section size, and will fit
 *  into 2KB of bootloader space for the Series 2 USB AVRs (ATMEGAxxU2, AT90USBxx2) or 4KB of bootloader space for
 *  all other models. If you wish to alter this size and/or change the AVR model, you will need to edit the MCU,
 *  FLASH_SIZE_KB and BOOT_SECTION_SIZE_KB values in the accompanying makefile.
 *
 *  \warning <b>THIS BOOTLOADER IS NOT SECURE.</b> Malicious entities can recover written data, even if the device
 *           lockbits are set.
 *
 *  \section Sec_Running Running the Bootloader
 *
 *  This bootloader is designed to be started via the \c HWB mechanism of the USB AVRs; ground the \c HWB pin (see device
 *  datasheet) then momentarily ground \c /RESET to start the bootloader. This assumes the \c HWBE fuse is set and the
 *  \c BOOTRST fuse is cleared.
 *
 *  \section Sec_Installation Driver Installation
 *
 *  This bootloader uses the HID class driver inbuilt into all modern operating systems, thus no additional drivers
 *  need to be supplied for correct operation.
 *
 *  \section Sec_HostApp Host Controller Application
 *
 *  Due to licensing issues, the supplied bootloader is compatible with the HalfKay bootloader protocol designed
 *  by PJRC, but is <b>not compatible with the cross-platform loader GUI</b>. A modified version of the open source
 *  cross-platform TeensyLoader application is supplied, which can be compiled under most operating systems. The
 *  command-line loader application should remain compatible with genuine Teensy boards in addition to boards using
 *  this custom bootloader.
 *
 *  Once compiled, programs can be loaded into the AVR's FLASH memory through the following example command:
 *  \code
 *  hid_bootloader_cli -mmcu=at90usb1287 Mouse.hex
 *  \endcode
 *
 *  \section Sec_KnownIssues Known Issues:
 *
 *  \par After loading an application, it is not run automatically on startup.
 *  Some USB AVR boards ship with the \c BOOTRST fuse set, causing the bootloader
 *  to run automatically when the device is reset. This booloader requires the
 *  \c BOOTRST be disabled and the HWBE fuse used instead to run the bootloader
 *  when needed.
 *
 *  \section SSec_Options Project Options
 *
 *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
 *
 *  <table>
 *   <tr>
 *    <td>
 *     None
 *    </td>
 *   </tr>
 *  </table>
 */