So I’m looking to put a cheap ass MSP430Gsomething on a cape I’m making, to implement a custom watchdog. Has anyone seen a GPIO implementation of the Spy-bi-wire protocol? Ideally for BBB, but any implementation would help.
Why not use a dedicated watchdog IC?
The cheap ones I’ve found do not have a steady state output on WDO, instead they are alternating: http://www.st.com/web/en/resource/technical/document/datasheet/CD00176077.pdf
But I’ve found a super cheap solution, which is to use the built in watchdog timer on the BBB 
Oh right, forgot about that!
It would still be interesting to know how to program an MSP430 form a BBB, though