(See USBasp, AVRdoper, USBprog)Īll the firmware code is distributed under the GPL, the hardware design layout files are CC 2.5 Attrib./Share-alike. Having a full kit available solves the "chicken & egg" problem of purchasing or building a USB programmer that then needs a programmer of some sort to 'kick start'. You can build this design using the schematic and firmware, or buy a kit from the Adafruit webshop. Other changes are new VID/PID (to make it official), removing some of the commands, and moving around the pins a bit. The main improvements are: adjusting the code to allow it to act as a SpokePOV interface, adding lowlevel bitbang commands, and addition of a "USB good" LED. The project is based off of the USBtiny code & design. Perfect for students and beginners, or as a backup programmer. It is low cost, easy to make, works great with avrdude, is AVRStudio-compatible and tested under Windows, Linux and MacOS X. This is documentation for a simple open-source USB AVR programmer and SPI interface.
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