Method update

src/audio_play/ToneGenerator.cpp:114–131

}

void ToneGenerator::update() {
    if (!_available) return;
    //if ((*stream)->ready() < 2) return;

    int16_t * ptr = (int16_t*)((*stream)->buffer.getWritePointer());

    for (int i = 0; i < _block_size / sizeof(int16_t); i ++) {
        ptr[i] = MAX_INT16 * (_tone.amplitude * wave(_delta * _t));
        _t += _tone.frequency;
        _t = _t >= _sample_rate ? _t - _sample_rate : _t;
        if (_modulation && ++t_call >= call_every) {
            _tone = _modulation();
            t_call -= call_every;
        }
    }

    (*stream)->provide(1);
}

int ToneGenerator::get_max_frequency() {
    return _frequency_high;