Hi guys, Hope you can help me, first time poster so please be kind 
I am attempting to get the SparkFun 16x2 SerLCD - RGB Text (Qwiic) working with my Teensy 3.5.
I have hooked it up via I2C to the correct pins on the Teensy and am running the default “Example1-Hello World” sketch.
The I2C wires are less than 130mm / 5inches long and connected from JST to screw terminals. I have connected VIN to RAW as per I2C Hookup Guide and Ground to Negative as per guide.
I am having two issues:
Wherever I am not writing a character I get a filled square. I have looked in the documentation and can’t see mention and this doesn’t match photos in the hookup guide.
The “lcd.setCursor(0, 1);” seems to be ignored and the values are being drawn to different positions that are occasionally shifting.
What I have tried:
adding delays (as clock speed of Teensy is very 120Hz.
shortening I2C Wires - though I have had much longer work with other displays in past
tried other examples - with similar result
only updating if result is different to previous result
Any suggestions would be appreciated thankyou!
I will post to Teensy forums as well to see if they have ideas from that direction.
Solved by switching to SUART from I2C!
Will leave the above up so that if anyone comes across this problem they have a clue.
