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Eliminated floating point arithmetic.
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@ -54,23 +54,23 @@ void DigitalPhaseLockedLoop::add_pulse()
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else
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else
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{
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{
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// perform a linear regression
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// perform a linear regression
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float sum_xy = 0;
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int sum_xy = 0;
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float sum_x = 0;
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int sum_x = 0;
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float sum_y = 0;
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int sum_y = 0;
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float sum_x_squared = 0;
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int sum_x_squared = 0;
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for(size_t pulse = 0; pulse < _length_of_history; pulse++)
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for(size_t pulse = 0; pulse < _length_of_history; pulse++)
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{
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{
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int x = _pulse_history_array[pulse] / (int)_current_window_length;
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int x = _pulse_history_array[pulse] / (int)_current_window_length;
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int y = _pulse_history_array[pulse] % (int)_current_window_length;
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int y = _pulse_history_array[pulse] % (int)_current_window_length;
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sum_xy += (float)(x*y);
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sum_xy += x*y;
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sum_x += (float)x;
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sum_x += x;
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sum_y += (float)y;
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sum_y += y;
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sum_x_squared += (float)x*x;
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sum_x_squared += x*x;
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}
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}
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float gradient = ((float)_length_of_history*sum_xy - sum_x*sum_y) / ((float)_length_of_history*sum_x_squared - sum_x*sum_x);
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int gradient = (_length_of_history*sum_xy - sum_x*sum_y) / (_length_of_history*sum_x_squared - sum_x*sum_x);
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_current_window_length += (unsigned int)(gradient / 2.0);
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_current_window_length += gradient / 2;
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if(_current_window_length < _clocks_per_bit - _tolerance) _current_window_length = _clocks_per_bit - _tolerance;
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if(_current_window_length < _clocks_per_bit - _tolerance) _current_window_length = _clocks_per_bit - _tolerance;
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if(_current_window_length > _clocks_per_bit + _tolerance) _current_window_length = _clocks_per_bit + _tolerance;
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if(_current_window_length > _clocks_per_bit + _tolerance) _current_window_length = _clocks_per_bit + _tolerance;
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}
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}
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