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open-source USB AVR programmer and SPI interface

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Mr.Cool

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open avr spi

https://www.ladyada.net/make/usbtinyisp/

Introduction

This is documentation for a simple open-source USB AVR programmer and SPI interface. It is low cost, easy to make, works great with avrdude, is AVRStudio-compatible and tested under Windows, Linux and MacOS X. Perfect for students and beginners, or as a backup programmer.

The project is based off of the USBtiny code & design. 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. Other changes are new VID/PID (to make it official), removing some of the commands, and moving around the pins a bit.

You can build this design using the schematic and firmware, or buy a kit from the Adafruit webshop. 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'. (See USBasp, AVRdoper, USBprog)

All the firmware code is distributed under the GPL, the hardware design layout files are CC 2.5 Attrib./Share-alike


Easy to make

* Ultra low cost: programmer is $16 in parts, less than half the price of the AVRISP v2 ! (Kits are $22 and available from the adafruit shop)
* Kit comes with both 6-pin and 10-pin AVR-standard connectors and cables. Almost no programmers that are not from Atmel have both! (Including the AVRISP v2)
* Easy to build: All through-hole parts, all common and available from large distributors

Mr.Cool
 

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