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Originally Posted by Alan Anderson
This is using integer arithmetic. The division by 254 gives an intermediate result of zero, so the final answer is always 127.
You need to either a) force floating point arithmetic by dividing by 254.0, or b) scale the intermediate calculations up by multiplying by a constant (e.g. 256) first and dividing by the same constant just before adding the 127.
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The multiplication by p1_wheel should happen first by order of operations (left-to-right). You could try adding parenthesis around the (p1_wheel)*(p1_y - 127) part and that may fix it. My other thought is that you may be doing 8-bit arithmetic and not 16-bit arithmetic. You might want to move p1_y and p1_wheel into int's first so that it's guaranteed to be 16-bit arithmetic and not 8-bit.
Matt