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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
A11/A12 are used for USB (they're the only available pins), and D0/D1 are the only available pins for the crystal. B8/B9 seem to be available though - and on pins:
http://www.espruino.com/ReferenceESPRUINOBOARD
If someone wants to put the effort in to add CAN support to the software (it may really not be too hard, and all source is available) then I'd love to include it. At the moment I'm afraid I just don't have time to implement it myself though.
The problem really is who will actually use it...
The main use case for it seems to be to look at OBD signals from car engines - but to be honest you can buy an OBD-Serial adaptor that handles multiple protocols (ELM323) ready-wired with the connector for a few pounds on eBay - and Espruino will happily talk to the ELM323 as-is via the USART...