I am using the ADS1256 Library designed to interface ADS1256 with Arduino. The code worked perfectly fine with Arduino uno but displays 0 differential values on using Arduino Nano 33 IOT.

I have connected my 2 sensor output pins with AI1 AI2 AI3 and AI4 of ADS1256 and the pin connections between the Arduino and ADS is as per the pin numbers in the code. I am operating the ADS in differential mode. The code gets uploaded to Arduino successfully although it shows the warning of incompatibility. But as per the repository it is compatible with Arduino nano 33 IOT. after uploading the code on opening the serial monitor all the registers like PGA MUX and DRATE appears to be zero and even the values from the channel appears to be zero. But the same code works fine with arduino uno. Is the problem related to compatibility or ither issues in the code?? Please help me out. Find the code and the screenshot of arduino ide serial plot below.

Thank you