[Mike Betts]

Matt,

There is a lot of your declarations not shown (such as your pid structure) but I'm guessing your issue is with the printf statement. "measurement" is declared as a long at the top of your function and being passed to printf as a long but printf is expecting an int. It should be cast as "(int) measurement". This would throw off all of your stack variables by two bytes each.

Output may be non-zero but I doubt it is correct.

Good Luck...

Mike