I am having issues with uploading sketches to a bare SAM3X chip. I have my hardware configured like the USB programming port on the DUE, using an Atmega16u2 interface. I've programmed the 16u2 with the avrisp mkii programmer, with the firmware found here: https://github.com/arduino/Arduino/tree/mas…

Programming Bare SAM3X Chip

graynomad May 15, 2013, 1:16am 9

The SAM uses a 12MHz crystal (Y1), Y4 is shown as 12MHz also on the schematics but 16MHz would be way more likely, I don't have a Due to check.

Rob

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