Sx i2c

Rsadeika

Trying to get some clarification about hooking up an SX tech board with an SX52 proto board using I2C. Is it as simple as hooking a wire to, lets say, RA.0 and another wire to RA.1 on to both boards, and I would be ready to have the boards talk to each other, with the proper programs of course. And I noticed, in the docs special notes, that it recomends some pull-ups. If I just use PLP_A, would that suffice. Looking for some comments and direction.

Thanks in advance

Paul Baker

The internal pullups are weak (>10k&#937[noparse];)[/noparse], this is sufficient if you are only connecting two devices over a short distance at lower frequencies (<1 MHz). If any of these are not the case you should use external pullup resistors.

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Bean

If your using SX/B be aware that the I2C commands are for master only.
I2C slave code is quite a bit more complecated.
For general communication I would use serial.
Bean.

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Paul Baker

Theres an app note for I2C slave on the SX downloads page. It is written in assembler though.

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·1+1=10

Rsadeika

Thanks Paul and Bean,

I guess two wires is fine, right? Just to get my toes wet, I want to set up a simple experiment, on one board I will have my IR detector, on the other board I will have an LED on/off circuit. Press the remote and see if the LED lights up on the other board. I am looking at Guenther's book for possibly adding a slave aspect, once I feel comfortable with this.

Does anybody have a simple schematic for implementing an I2C connector·on an SX52 proto board, something that I could understand. This of course would be for a master/slave approach.

Thanks