beatsin88()

LIB8STATIC uint16_t beatsin88	(	accum88	beats_per_minute_88,
		uint16_t	lowest = 0,
		uint16_t	highest = 65535,
		uint32_t	timebase = 0,
		uint16_t	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! E.g. for 120 BPM it would be 120*256 = 30720. If you just want to specify "120", use beatsin16() or beatsin8().

Examples

Pacifica.ino, and Pride2015.ino.

Definition at line 801 of file lib8tion.h.

{
    uint16_t beat = beat88( beats_per_minute_88, timebase);
    uint16_t beatsin = (sin16( beat + phase_offset) + 32768);
    uint16_t rangewidth = highest - lowest;
    uint16_t scaledbeat = scale16( beatsin, rangewidth);
    uint16_t result = lowest + scaledbeat;
    return result;
}

References beat88(), LIB8STATIC, scale16(), and sin16.

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

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