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Lowering the pullup to 1.1K has the above code working reliably at 400khz. Without the pullup change, it would work up to ~200khz.

Thank you for your help and ideas. I think this is working to th ...

Thanks both of you for your thoughts.

Ttelmah, you bring up good points.

The hardware on this design(not under my control) does have a longer i2c path than I have programmed for in the past, and ...

So I've updated the code listing in the first post with the present state of the test code.

I've added some master code into the i2c slave to read from a MCP23017 occasionally.

Presently this c ...

Thanks for you insights PCM,

You are correct that the test program should use the I2C Master to really know it's working.

The master side is coded and working already, and talks to several MCP ...

5.019 from the .lst

Thanks Ttelmah for the suggestion.

I tried it out, and am still getting the same response from the hardware.

I've updated my first post to show the changes I made.

I'm reading through the onl ...

Hello,

I'm looking for ideas for things to try, or that I'm missing. I have a solution where I need a PIC to be both a Master on one set of pins, and a slave on another set( both sets are hw i2c m ...

Hey thanks for the confirmation( knowing you're not screwing it up is half the battle)

I've got it all working as of this morning.

Regards

riggsy

Hey there(first post, longtime lurker, you guys are great, I've written several apps that are in production just by reading through the posts here and bangin stuff out myself, kudos to all for your su ...