找到一个关于改造XPLAIN开发板成开源编程器的介绍

shaoziyang

前一段时间因为没有AVR JTAG编程器，无法对AVR Xmega Xplain进行编程。今天在网上找到一篇改造Bootloader的说明，等仔细研究后，看能不能用在手上的AVR Xmega Xplain开发板上。

http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=87393

shaoziyang

说明原文如下：

Freaks,

I've just completed what appears to be a working first revision of a programming firmware for the XPLAIN board, loadable via FLIP into the onboard AT90USB1287. When loaded, it will cause the USB AVR to enumerate as a AVRISP-MKII which (with the latest AVRStudio release) can then program the board's XMEGA via its PDI interface.

I've attached the first build of the programmer firmware here. All those with XPLAIN boards gathering dust because you don't have an external programmer - this is for you! All I ask is for some feedback; post here if the firmware works (or doesn't work) for you.

For those interested in a generic open source XMEGA programmer, the source code for this is located in my LUFA project public SVN at http://code.google.com/p/lufa-lib/, under the Projects/AVRISP/ folder.

A very, very, very big special thanks to Justin Mattair for his help with the PDI protocol, and to Ross McKenzie for loaning me his XPLAIN board for development.

Note that Rev 1 XPLAIN boards have a faulty bootloader in the USB AVR, and cannot be flashed with this firmware without an external JTAG programmer.

EDIT: Latest build and source is now available from my site: http://www.fourwalledcubicle.com/XPLAIN.php

EDIT: I've posted a short guide to loading and using the firmware on my blog: http://fourwalledcubicle.com/blog/archives/508