Hello—using Scroll PHAT hooked up works great on compute module (like an rpi3) with Stretch. Used your software examples to scroll around some messages.
However my circuit board MUST wire it to SDA0 & SCL0 (i2c0) rather than i2c1. Note, unlike the rpi3, both i2c ports are usable (as I have done so with several chips)
Using the sudo i2cdetect -y 0 Phat shows up correctly with the module address on I2C0. However my sample programs now give an OSError: [Errno 121] Remote I/O error, since obviously the other port needs used (it is still trying to use I2C1).
What parameter do I need to change or supply (or edit a file) so the script will work on the other port SDA0 & SCL0? Again the way my board is made, it must connect to these pins.
import scrollphathd as ledbar
ledbar.write_string(“hello there–it works!!”)