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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Looks good - definitely if you're putting it into a product, doing your own compile with SD card support built in (and whatever else) probably makes a lot of sense anyway.
One thing though: I was told (I'm not sure if it's true) that the licence for the Discovery boards forbids them to be used in anything commercial - I believe one of the reasons the board itself is so cheap is that ST basically sells it at cost.
That means that you may have to look at another system anyway - or maybe MikroElektronika makes their own F4 board...