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Re: Accelerometer code
You could also do your fixed point math another way by calculating your result in units mg's rather than g's by multiplying the appropriate values by 1000. It is not as efficient as bit shifting since you actually have to use multiply and divide statements, but may be a bit more readable.
If you do stick with just the IFI controller, you can probably get reasonable accuracy as the code comments indicate a period of 9.6 milliseconds for the accelerometer. While a low priority interrupt can be delayed depending on what the process is doing, you should be able to maintain an error of less than 1% due to interrupt delay.
Mike
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