While I’m less and less allergic to float where performance is concerned, it does and always will have a significant precision problem since float is inherently ‘lossy’. When precision and performance matter with decimal values, there’s still no substitute for fixed point math. Using Fixed-Point Math for Embedded Applications by Steve Hageman has a lot of excellent advice on getting the most out of your MCU for the least amount of work, and contains some generally excellent tips for signal capture and manipulation.
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