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#215939
I am looking at the Artemis schematics and comparing them to the board on my desk. They don't match up when it comes to the generating the BOOT signal. The eagle schematics for the Artemis Redboard, Nano, and ATP show that one of the resistors is "DNP", which I assume means "Do Not Populate", while the other is listed as being 220K. The cap is shown as a 0.1 uF.

In contrast, measuring the components on my Artemis blackboard shows a 100K resistor in the DNP position, a 10K resistor in the 220K position, and a 2.2 uF cap instead of a 0.1 uF cap.

To add to the mystery, I found a PDF schematic of the Artemis Nano on the Sparkfun website that shows the circuit with a 100K R, a 10K R and a 2.2uF cap. That is not what the Eagle schematic shows for that exact same board, but it does match the components I found on my blackboard.

Which version is correct? Is there documentation on how the BOOT circuit is supposed to work? I could not find any, but when BOOT is one of the search terms it gets a lot of hits...

I have attached a PDF of what I am talking about with snippets from both versions of schematics.
#215994
The original Artemis boards (experimetnal SparkX, black) used a different bootloader configuration than the more recent production versions (Red, ususally). The updated version supports auto-bootload with the signal from only one control line on a USB-Serial converter.

My RedBoard Artemis Nano indeed is missing the R17 component that is listed as DNP on the schematic.
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