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/** \file
*
* This file contains special DoxyGen information for the generation of the main page and other special
* documentation pages. It is not a project source file.
*/
/** \mainpage AVRISP MKII Programmer Project
*
* \section SSec_Compat Project Compatibility:
*
* The following list indicates what microcontrollers are compatible with this project.
*
* - Series 7 USB AVRs
* - Series 6 USB AVRs
* - Series 4 USB AVRs
* - Series 2 USB AVRs (8KB versions with reduced features only)
*
* \section SSec_Info USB Information:
*
* The following table gives a rundown of the USB utilization of this project.
*
* <table>
* <tr>
* <td><b>USB Mode:</b></td>
* <td>Device</td>
* </tr>
* <tr>
* <td><b>USB Class:</b></td>
* <td>Vendor Specific Class</td>
* </tr>
* <tr>
* <td><b>USB Subclass:</b></td>
* <td>N/A</td>
* </tr>
* <tr>
* <td><b>Relevant Standards:</b></td>
* <td>Atmel AVRISP MKII Protocol Specification</td>
* </tr>
* <tr>
* <td><b>Usable Speeds:</b></td>
* <td>Full Speed Mode</td>
* </tr>
* </table>
*
* \section SSec_Description Project Description:
*
* Firmware for an AVRStudio compatible AVRISP-MKII clone programmer. This project will enable the USB AVR series of
* microcontrollers to act as a clone of the official Atmel AVRISP-MKII programmer, usable within AVRStudio. In its
* most basic form, it allows for the programming of 5V AVRs from within AVRStudio with no special hardware other than
* the USB AVR and the parts needed for the USB interface. If the user desires, more advanced circuits incorporating
* level conversion can be made to allow for the programming of 3.3V AVR designs.
*
* This device spoofs Atmel's official AVRISP-MKII device PID so that it remains compatible with Atmel's AVRISP-MKII
* drivers. When prompted, direct your OS to install Atmel's AVRISP-MKII drivers provided with AVRStudio.
*
* Note that this design currently has the following limitations:
* - Minimum ISP target clock speed of 500KHz due to hardware SPI module prescaler limitations
* - No reversed/shorted target connector detection and notification
* - A seperate header is required for each of the ISP, PDI and TPI programming protocols that the user wishes to use
* - XMEGA EEPROM erase section command does not work (but EEPROM read/write and chip erase does)
*
* On AVR models with an ADC converter, AVCC should be tied to 5V (e.g. VBUS) and the VTARGET_ADC_CHANNEL token should be
* set to an appropriate ADC channel number in the project makefile for VTARGET detection to operate correctly. On models
* without an ADC converter, VTARGET will report a fixed 5V level at all times.
*
* While this application can be compiled for USB AVRs with as little as 8KB of FLASH, for full functionality 16KB or more
* of FLASH is required. On 8KB devices, ISP or PDI/TPI programming support can be disabled to reduce program size.
*
* \section Sec_ISP ISP Connections
* Connections to the device for SPI programming (when enabled):
*
* <table>
* <tr>
* <td><b>Programmer Pin:</b></td>
* <td><b>Target Device Pin:</b></td>
* <td><b>ISP 6 Pin Layout:</b></td>
* </tr>
* <tr>
* <td>MISO</td>
* <td>PDO</td>
* <td>1</td>
* </tr>
* <tr>
* <td>ADCx <b><sup>1</sup></b></td>
* <td>VTARGET</td>
* <td>2</td>
* </tr>
* <tr>
* <td>SCLK</td>
* <td>SCLK</td>
* <td>3</td>
* </tr>
* <tr>
* <td>MOSI</td>
* <td>PDI</td>
* <td>4</td>
* </tr>
* <tr>
* <td>PORTx.y <b><sup>2</sup></b></td>
* <td>/RESET</td>
* <td>5</td>
* </tr>
* <tr>
* <td>GND</td>
* <td>GND</td>
* <td>6</td>
* </tr>
* </table>
*
* In addition, the AVR's XCK pin will generate a .5MHz clock when SPI programming is used, to act as an external
* device clock if the fuses have been mis-set. To use the recovery clock, connect XCK to the target AVR's XTAL1
* pin, and set the ISP programming speed to 125KHz or below.
*
* <b><sup>1</sup></b> <i>Optional, see \ref SSec_Options section - for USB AVRs with ADC modules only</i> \n
* <b><sup>2</sup></b> <i>See AUX line related tokens in the \ref SSec_Options section</i>
*
* \section Sec_PDI PDI Connections
* Connections to the device for PDI programming (when enabled):
*
* <table>
* <tr>
* <td><b>Programmer Pin:</b></td>
* <td><b>Target Device Pin:</b></td>
* <td><b>PDI 6 Pin Layout:</b></td>
* </tr>
* <tr>
* <td>Tx/Rx <b><sup>2</sup></b></td>
* <td>DATA</td>
* <td>1</td>
* </tr>
* <tr>
* <td>ADCx <b><sup>1</sup></b></td>
* <td>VTARGET</td>
* <td>2</td>
* </tr>
* <tr>
* <td>N/A</td>
* <td>N/A</td>
* <td>3</td>
* </tr>
* <tr>
* <td>N/A</td>
* <td>N/A</td>
* <td>4</td>
* </tr>
* <tr>
* <td>XCK</td>
* <td>CLOCK</td>
* <td>5</td>
* </tr>
* <tr>
* <td>GND</td>
* <td>GND</td>
* <td>6</td>
* </tr>
* </table>
*
* <b><sup>1</sup></b> <i>Optional, see \ref SSec_Options section - for USB AVRs with ADC modules only</i> \n
* <b><sup>2</sup></b> <i>The AVR's Tx and Rx become the DATA line when connected together via a pair of 220 ohm resistors</i> \n
*
* \section Sec_TPI TPI Connections
* Connections to the device for TPI programming (when enabled):
*
* <table>
* <tr>
* <td><b>Programmer Pin:</b></td>
* <td><b>Target Device Pin:</b></td>
* <td><b>TPI 6 Pin Layout:</b></td>
* </tr>
* <tr>
* <td>Tx/Rx <b><sup>2</sup></b></td>
* <td>DATA</td>
* <td>1</td>
* </tr>
* <tr>
* <td>ADCx <b><sup>1</sup></b></td>
* <td>VTARGET</td>
* <td>2</td>
* </tr>
* <tr>
* <td>XCK <b><sup>2</sup></b></td>
* <td>CLOCK</td>
* <td>3</td>
* </tr>
* <tr>
* <td>N/A</td>
* <td>N/A</td>
* <td>4</td>
* </tr>
* <tr>
* <td>PORTx.y <b><sup>3</sup></b></td>
* <td>/RESET</td>
* <td>5</td>
* </tr>
* <tr>
* <td>GND</td>
* <td>GND</td>
* <td>6</td>
* </tr>
* </table>
*
* <b><sup>1</sup></b> <i>Optional, see \ref SSec_Options section - for USB AVRs with ADC modules only</i> \n
* <b><sup>2</sup></b> <i>The AVR's Tx and Rx become the DATA line when connected together via a pair of 220 ohm resistors</i> \n
* <b><sup>3</sup></b> <i>See AUX line related tokens in the \ref SSec_Options section</i>
*
* \section SSec_Options Project Options
*
* The following defines can be found in this project, which can control the project behaviour when defined, or changed in value.
*
* <table>
* <tr>
* <td><b>Define Name:</b></td>
* <td><b>Location:</b></td>
* <td><b>Description:</b></td>
* </tr>
* <tr>
* <td>AUX_LINE_PORT</td>
* <td>Makefile CDEFS</td>
* <td>PORT register for the programmer's AUX target line. The use of this line varies between the programming protocols,
* but is generally used for the target's /RESET line. <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>AUX_LINE_PIN</td>
* <td>Makefile CDEFS</td>
* <td>PIN register for the programmer's AUX target line. The use of this line varies between the programming protocols,
* but is generally used for the target's /RESET line. <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>AUX_LINE_DDR</td>
* <td>Makefile CDEFS</td>
* <td>DDR register for the programmer's AUX target line. The use of this line varies between the programming protocols,
* but is generally used for the target's /RESET line. <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>AUX_LINE_MASK</td>
* <td>Makefile CDEFS</td>
* <td>Mask for the programmer's AUX target line. The use of this line varies between the programming protocols,
* but is generally used for the target's /RESET line. <b>Must not be the AVR's /SS pin</b>. <i>Ignored when
* compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>VTARGET_ADC_CHANNEL</td>
* <td>Makefile CDEFS</td>
* <td>ADC channel number (on supported AVRs) to use for VTARGET level detection, if NO_VTARGET_DETECT is not defined.
* <i>Ignored when compiled for targets lacking an ADC.</i></td>
* </tr>
* <tr>
* <td>ENABLE_ISP_PROTOCOL</td>
* <td>Makefile CDEFS</td>
* <td>Define to enable SPI programming protocol support. <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>ENABLE_XPROG_PROTOCOL</td>
* <td>Makefile CDEFS</td>
* <td>Define to enable PDI and TPI programming protocol support. <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>NO_VTARGET_DETECT</td>
* <td>Makefile CDEFS</td>
* <td>Define to disable VTARGET sampling and reporting on AVR models with an ADC converter. This will cause the programmer
* to report a fixed 5V target voltage to the host regardless of the real target voltage. <i>Ignored when compiled for
* targets lacking an ADC.</i></td>
* </tr>
* <tr>
* <td>VTARGET_REF_VOLTS</td>
* <td>Makefile CDEFS</td>
* <td>Indicates the programmer AVR's AVCC reference voltage when measuring the target's supply voltage. Note that the supply
* voltage should never exceed the reference voltage on the programmer AVR without some form of protection to prevent damage
* to the ADC. <i>Ignored when compiled for targets lacking an ADC, or when NO_VTARGET_DETECT is defined.</i></td>
* </tr>
* <tr>
* <td>VTARGET_SCALE_FACTOR</td>
* <td>Makefile CDEFS</td>
* <td>Indicates the target's supply voltage scale factor when applied to the ADC. A simple resistive divider can be used on the
* ADC pin for measuring the target's supply voltage, so that voltages above the programmer AVR's AVCC reference voltage can be
* measured. This should be the reciprocal of the division performed - e.g. if the VTARGET voltage is halved, this should be set
* to 2. <i>Ignored when compiled for targets lacking an ADC, or when NO_VTARGET_DETECT is defined.</i></td>
* </tr>
* <tr>
* <td>LIBUSB_DRIVER_COMPAT</td>
* <td>Makefile CDEFS</td>
* <td>Define to switch to a non-standard endpoint scheme, breaking compatibility with AVRStudio under Windows but making
* the code compatible with software such as avrdude (all platforms) that use the libUSB driver.
* </tr>
* </table>
*/
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