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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 Sec_Compat Project Compatibility
*
* The following list indicates what microcontrollers are compatible with this project.
*
* \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) - <i>8KB versions with reduced features only</i>
*
* \section Sec_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>Supported USB Speeds:</b></td>
* <td>Full Speed Mode</td>
* </tr>
* </table>
*
* \section Sec_Description Project Description
*
* Firmware for an Atmel Studio 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
* Atmel Studio or with any software capable of driving a real Atmel AVRISP-MKII programmer. In its most
* basic form, it allows for the programming of AVR TINY, MEGA and XMEGA devices at the programmer's VCC voltage from
* within Atmel Studio 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 target AVRs running at a different voltage to the programmer.
*
* This device spoofs Atmel's official AVRISP-MKII device PID so that it remains compatible with Atmel's AVRISP-MKII
* drivers. It is currently tested working under the following configurations:
*
* - <b>Windows:</b> Atmel Studio 7, with alternative driver
* - <b>Windows:</b> AVRDUDE 6.2, with alternative driver
* - <b>Linux:</b> AVRDUDE 6.1
*
* <b>Note that this clone requires a libUSB based driver under Windows,</b> due to an incompatible change in the official
* Jungo based driver. The alternative driver given here will function with both real and clone AVRISP devices in Atmel
* Studio 7 onwards under Windows - and as a bonus, also provides AVRDude access to the programmer.
*
* As of Atmel Studio version 7.0.1417 the legacy Jungo driver has been deprecated in favor of an official libUSB based
* driver, making the driver packaged here superfluous. Use the driver packaged here only if you are still using an earlier
* Atmel Studio 7 build, otherwise the official Atmel libUSB driver should be used.
*
* Note that this design currently has the following limitations:
* - No reversed/shorted target connector detection and notification
* - A separate header is required for each of the ISP, PDI and TPI programming protocols that the user wishes to use
*
* On AVR models with an ADC converter, the USB AVR's AVCC pin should be tied to 5V (e.g. VBUS) and the
* \c 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 3.3V level at all times
* which should allow the programmer to remain compatible at the protocol level with all AVR devices.
*
* 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 protocol programming support can be disabled to reduce program size.
*
* \section Sec_KnownIssues Known Issues:
*
* \par XMEGA EEPROM programming fails in some cases.
* Several users have reported that XMEGA EEPROM programming fails unless the chip is erased first. If a non-blank EEPROM
* is present, writing further EEPROM data causes corruption.
* <a href="https://github.com/abcminiuser/lufa/issues/25">LUFA issue tracker entry</a>.
*
* \section Sec_Installation Installation
* The programmer supports multiple platforms, both Windows and Linux.
*
* \subsection SSec_LinuxInstallation Linux Installation
* On Linux systems, the programmer should be usable out of the box with no special setup other than (on some systems)
* editing of the system permissions to allow the programmer to be used from a non-elevated (root) context. The programmer
* is compatible with the free open source AVRDude programming software project.
*
* \subsection SSec_WindowsInstallation Windows Installation
* On Windows systems, due to an unfortunate limitation of the USB AVR devices and the Atmel Studio platform, the programmer
* requires an alternative libUSB based driver. Uninstall the existing Jungo driver for the device (if installed) and replace
* it with the driver that ships with this project, to enable access to the programmer in Atmel Studio and AVRDUDE.
*
* \section Sec_ISP ISP Connections
* Connections to the device for SPI programming (when enabled):
*
* <table>
* <tr>
* <th><b>Programmer Pin:</b></th>
* <th><b>Target Device Pin:</b></th>
* <th><b>ISP 6 Pin Layout:</b></th>
* </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 OCR1A pin will generate a 4MHz clock, to act as an external rescue device clock if the
* fuses have been mis-set. To use the recovery clock, connect the OCR1A pin of the USB AVR to the target AVR's
* XTAL1 pin, and set the ISP programming speed to 125KHz (note: other ISP speeds will not work correctly).
*
* <b><sup>1</sup></b> <i>Optional, see \ref Sec_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 Sec_Options section</i>
*
* \section Sec_PDI PDI Connections
* Connections to the device for PDI programming (when enabled):
*
* <table>
* <tr>
* <th><b>Programmer Pin:</b></th>
* <th><b>Target Device Pin:</b></th>
* <th><b>PDI 6 Pin Layout:</b></th>
* </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 Sec_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>
* <th><b>Programmer Pin:</b></th>
* <th><b>Target Device Pin:</b></th>
* <th><b>TPI 6 Pin Layout:</b></th>
* </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 Sec_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 Sec_Options section</i>
*
* \section Sec_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>
* <th><b>Define Name:</b></th>
* <th><b>Location:</b></th>
* <th><b>Description:</b></th>
* </tr>
* <tr>
* <td>AUX_LINE_PORT</td>
* <td>AppConfig.h</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.
* \n \n <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>AUX_LINE_PIN</td>
* <td>AppConfig.h</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.
* \n \n <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>AUX_LINE_DDR</td>
* <td>AppConfig.h</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.
* \n \n <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>AUX_LINE_MASK</td>
* <td>AppConfig.h</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>.
* \n \n <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>VTARGET_ADC_CHANNEL</td>
* <td>AppConfig.h</td>
* <td>ADC channel number (on supported AVRs) to use for VTARGET level detection, if NO_VTARGET_DETECT is not defined.
* \n \n <i>Ignored when compiled for targets lacking an ADC.</i></td>
* </tr>
* <tr>
* <td>ENABLE_ISP_PROTOCOL</td>
* <td>AppConfig.h</td>
* <td>Define to enable SPI programming protocol support.
* \n \n <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>ENABLE_XPROG_PROTOCOL</td>
* <td>AppConfig.h</td>
* <td>Define to enable PDI and TPI programming protocol support.
* \n \n <i>Ignored when compiled for the XPLAIN board.</i></td>
* </tr>
* <tr>
* <td>NO_VTARGET_DETECT</td>
* <td>AppConfig.h</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 3.3V target voltage to the host regardless of the real target voltage.
* \n \n <i>Ignored when compiled for targets lacking an ADC.</i></td>
* </tr>
* <tr>
* <td>VTARGET_REF_VOLTS</td>
* <td>AppConfig.h</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.
* \n \n <i>Ignored when compiled for targets lacking an ADC, or when NO_VTARGET_DETECT is defined.</i></td>
* </tr>
* <tr>
* <td>VTARGET_USE_INTERNAL_REF</td>
* <td>AppConfig.h</td>
* <td>Selects the internal 2.56V ADC reference voltage, instead of using the AVR's VREF pin. When enabled, this option will
* override the VTARGET_REF_VOLTS configuration option.
* \n \n <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>AppConfig.h</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.
* \n \n <i>Ignored when compiled for targets lacking an ADC, or when NO_VTARGET_DETECT is defined.</i></td>
* </tr>
* <tr>
* <td>XCK_RESCUE_CLOCK_ENABLE</td>
* <td>AppConfig.h</td>
* <td>Define to move the ISP rescue clock to the AVR's XCK pin instead of the OCR1A output pin. This is useful for existing programming
* hardware that does not expose the OCR1A pin of the AVR, but <i>may</i> cause some issues with PDI programming mode.</td>
* </tr>
* <tr>
* <td>INVERTED_ISP_MISO</td>
* <td>AppConfig.h</td>
* <td>Define to invert the received data on the ISP MISO line. This is sometimes needed depending on the level translation hardware used,
* if the translator hardware inverts the received logic level.</td>
* </tr>
* <tr>
* <td>FIRMWARE_VERSION_MINOR</td>
* <td>AppConfig.h</td>
* <td>Define to set the minor firmware revision nunber reported to the host on request. By default this will use a firmware version compatible
* with the latest Atmel IDE version, however if desired the reported minor value can be adjusted here.</td>
* </tr>
* </table>
*/
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