commutation between 2 sx chips

Travis Best

I am new to the whole sx thing and really haven't done much programing like this before so any help is greatly appreciated but anyhow what is the best way to pass a 2 digit value between 2 sx chips 1 chip needs to send the data and the other need to receive they dont need to pass it back and forth I need to be able to do this using as little code and the least amount of pins possible thanks for any help

Sparks-R-Fun

Sending data serially is probably the most straightforward and common approach. If you do this asynchronously (such as with the SX/B SerIn and SerOut commands) you can send values in one direction with a single signal wire and a ground connection.

If the chips are located far apart from each other you may want to use additional hardware to compensate for signal loss and noise.

- Sparks

Travis Best

is the serial out command affected if i am running a interrupt

Bean

Yes, an interrupt will affect the serial commands. I like the D-BUS protocol. It uses 2 pins and is not affected by the speed of either the sender or the receiver. It's not affected by interrupts either.

Bean.

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Travis Best

and good example anywhere on the dbus protocol using sx/b?

JonnyMac

Keep in mind that it's not that difficult to do ISR-driven serial with the SX; and SX/B allows one to easily mix assembly and BASIC so the overall programming chore is simplified.

I've attached a framework to get you started; it allows for half-duplex, ISR-driven serial on a single pin and will work from 1200 to 38.4K baud -- it uses Open True mode so you need to put a pull-up (don't use the internal pull-up) on the serial I/O pin.