beatsin88()

LIB8STATIC u16 fl::beatsin88	(	accum88	beats_per_minute_88,
		u16	lowest = 0,
		u16	highest = 65535,
		u32	timebase = 0,
		u16	phase_offset = 0 )

Generates a 16-bit sine wave at a given BPM that oscillates within a given range.

Parameters

beats_per_minute_88	the frequency of the wave, in Q8.8 format
lowest	the lowest output value of the sine wave
highest	the highest output value of the sine wave
timebase	the time offset of the wave from the millis() timer
phase_offset	phase offset of the wave from the current position

Warning

The BPM parameter MUST be provided in Q8.8 format!

Definition at line 63 of file beat.h.

                                                           {
    u16 beat = beat88(beats_per_minute_88, timebase);
    u16 beatsin = (sin16(beat + phase_offset) + 32768);
    u16 rangewidth = highest - lowest;
    u16 scaledbeat = scale16(beatsin, rangewidth);
    u16 result = lowest + scaledbeat;
    if (result > highest) {
        result = highest;
    }
    return result;
}

References beat88(), FL_NOEXCEPT, and LIB8STATIC.

Referenced by fl::Pacifica::draw(), and fl::Pride2015::draw().

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