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Old 08-22-2013, 12:32 AM   #14 (permalink)
t vago
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Added a two-stage filter in the freewheeling ADC interrupt routine. The first stage is a 16-element decimating CIC filter, which provides a 16x sampling frequency reduction. The second stage is a simple 1st order IIR filter. This should provide an adequate low-pass filter for the MAP sensor signal.

Did some code optimization, and got total code size down to 20158 bytes.
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