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#include "mozzi_utils.h"

/** @ingroup util

Given a power of 2, work out the number to shift right by to do a divide by the number, or shift left to multiply.

@param a power of 2, or any other number for that matter

@return the number of trailing zeros on the right hand end

*/

long trailingZeros(const unsigned long v) {

// find the number of trailing zeros in v, from http://graphics.stanford.edu/~seander/bithacks.html#ZerosOnRightFloatCast

// there are faster methods on the bit twiddling site, but this is short

float f = (float)(v & -v); // cast the least significant bit in v to a float

return (*(uint32_t *)&f >> 23) - 0x7f;

}

/** Convert BPM to milliseconds, which can be used to set the delay between beats for Metronome.

@param bpm beats per minute

*/

unsigned int BPMtoMillis(float bpm){

float seconds_per_beat = 60.f/bpm;

return (unsigned int) (seconds_per_beat*1000);

}