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I just got a Stellaris and a Tiva Launchpad talking CAN without a driver chip.  This uses diodes on the Tx pins, to common single bus wire with and a pull-up resistor.  This is strictly short-distance, but proof of concept for a quick hack.  See: http://www.mikrocontroller.net/attachment/28831/siemens_AP2921.pdf for details.   I used 3.3V, so I used a 3k pull-up, and used 1N4148 diodes.   

 

David

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I just got a Stellaris and a Tiva Launchpad talking CAN without a driver chip.  This uses diodes on the Tx pins, to common single bus wire with and a pull-up resistor.  This is strictly short-distance, but proof of concept for a quick hack.  See: http://www.mikrocontroller.net/attachment/28831/siemens_AP2921.pdf for details.   I used 3.3V, so I used a 3k pull-up, and used 1N4148 diodes.   

 

David

Very cool and good to know!  Definitely a nice alternative to I2C if you have the peripheral.

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