Freeplay CM4

[Flavor]

See the attached screenshot from the CM4 datasheet.  

   

First, note that it DOES have a GPIO 44&45.  It's odd to me that the makers of the adapter board didn't route those to pins 82&84.  That's an oversight, in my opinion.  They really should have routed those 2 pins.

Next, note that the CM4 has several other i2c busses.

UNFORTUNATELY, our Freeplay CM3 does not route GPIO0, GPIO1, GPIO2, or GPIO3 (which all would be top choice alternatives for i2c-0 or i2c-1).

So, now, you have to find another pair and repurpose it, I guess, and things could get complex.

Here's a screenshot of the Freeplay CM3 connector.  Note that, even though things like GPIO0 and GPIO1 are labeled, that's from the CM3 perspective, not the Freeplay perspective.  

   

MAYBE you could find a spot on the adapter board where GPIO0&1 _or_ GPIO2&3 were somehow easy to tack wires to.  Those can be set to i2c.

If they actually route pins 80/82 from the CM4, it would be good to find where they go.  This would be the best option (GPIO44/45).