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By Gyzmologist
I am a old PLC programmer and relearning C++ after many years.

I have an Artemis ATP and need to know how to access the IOMs on it. My project needs at least two each SPI and I2C channels, and I'm looking for the proper way to set them up. For this application I need to use hardware SPI/I2C for performance reasons. I have searched the forums and looked at the example programs, but haven't found the answer.

I read SPI.h and I2C.h and see references to VARIANT_SPI_INTFCS and VARIANT_WIRE_INTFCS which appear to determine how many of these interfaces are created. Where does VARIANT_SPI_INTFCS and VARIANT_WIRE_INTFCS come from, and how do I set them?

Is there another method for creating hardware SPI/I2C channels this that is preferred over this?

User avatar
By TS-Russell
This is a bit over our heads, but here goes:

Both of these libraries ... 2C/I2C.ino ... c/Wire.cpp

Have references to the VARIANT_SPI_INTFCS and VARIANT_WIRE_INTFCS - it looks like you can set whether you're using a pre-defined interface or create its MbedI2C objects using IOM pins...refer to the first link and the comments therein :-D

Hope this helps!
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