After a bit of experimentation I have noted that there is an error in the TILE-SENSA documentation relating to the LEDS..
Documentation example gives:
from machine import Pin, Signal
led_r = Signal('X2', Pin.OUT, value=0, invert=True)
led_g = Signal('X3', Pin.OUT, value=0, invert=True)
led_b = Signal('X4', Pin.OUT, value=0, invert=True)
led_r.on()
led_r.off()
But the LED's are actually on the 'Y' bus when the Tile is fitted to the DIP28.. nothing serious but that document should be amended. Not sure why this is different to the WBUS on the DIP68, but that seems to be what the schematics show me.
Also, it should be noted that with firmware PYBD-SF2-20191220-v1.12.dfu, the 3v3 line is NOT enabled by default as is documented in various places.
Chuckbook mentioned in another thread (i2c woes..) that a tool was being developed to show pin mappings etc. That would be a very handy document I reckon, would save a lot of time tracking through schematics..