RP2040 Feather cannot interface to Mini TFT Wing unless Seesaw library code is manually changed. about adafruit_seesaw

[caternuson]

Going to do both. Going ahead with making the breaking change:
earlephilhower/arduino-pico#1468
and will update documentation - mainly to cover that it will now be Wire (or default) instead of Wire1.

This will make things easier in the long run. No need to make the explicit reference to Wire1, which has been an ongoing source of confusion and issues.

[caternuson]

This is a legacy "feature". When the Feather RP2040 was originally added to the BSP, it lacked the ability to "map" the I2C pins to Wire or Wire1 as desired. So the pins being used by the Feather RP2040 ended up as Wire1 since they use the I2C1 peripheral of the RP2040.

Note that a non-default I2C bus can be passed in when creating the miniTFT seesaw instance. So the sketch's would (should) work with minor modification to the sketch code. No need to change any library code. Change:

Adafruit_miniTFTWing ss;

to:

Adafruit_miniTFTWing ss(&Wire1);

I2C being Wire1 is mentioned here:
https://learn.adafruit.com/adafruit-feather-rp2040-pico/pinouts#stemma-qt-3084853
but confusing since it's about the STEMMA QT connector. But the header pins are the same.

[emeb]

OK - looks like this is a non-conforming interface that can't be fixed without breaking all existing code. Perhaps the RP2040 feather documentation could be extended to mention your suggested instantiation change above?
At any rate, I'll close this issue now.