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MSP430FR50431: Parabolic Interpolation for Absolute ToF Calculations

Part Number: MSP430FR50431


I'm trying to analyze captured ADC data in order to best determine a ratio lobe to peak value in Matlab.  How can I implement the parabolic interpolation in Matlab as described in section of SLAA889?  I've started with interp1() using the 'spline' method, but I suspect that's quite different from what the firmware actually does.