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Just a little more info.

I connected a MCP 23017 I2C chip to an armExpress board using pins 9 and
10 of the armExpress as clock and data. The program sets the data
direction register to output on bit 0 of port A and I have an led
connected in a sink circuit to that pin. Comments in the program detail
the connections, however I'm working on generating a schematic which
I'll also upload if I'm successful.
I hope this will help anyone else trying to interface that part to the
armExpress.



Jim.

I've uploaded the schematic. Note three things.

1. It's hand drawn. I'm very frustrated with schematic drawing software.
2. I flunked 8th grade art. The teacher asked me (seriously) might I
not be a better candidate for shop class?
3. I think it's correct, but there might be an error or two.
4. I hate cad tools. They make life harder not easier! ( I know I said
3 but I had to get that one out there. I'm a EE that fell in love with
software and abandoned HW early on and am now being dragged kicking and
screaming back, )