I'm being bogged down by the math involved in using a I2C pressure sensor to calculate true pressure, so I'm looking for a simpler course to just detect a positive or negative changes in it's output rather calculate than it's absolute value.

At this point I only need to know if pressure is rising, falling, or steady. The sensor outputs a signed 16bit value.

Has anybody seen or used some PBP code to compare a new Word value against a previous Word value to see if the difference is positive or negative, and by how much ?

I'm short on bright ideas right now, so anything may help me get going the right way.