CLK/Components/AY38910/AY38910.cpp

//
//  AY-3-8910.cpp
//  Clock Signal
//
//  Created by Thomas Harte on 14/10/2016.
//  Copyright © 2016 Thomas Harte. All rights reserved.
//

#include "AY38910.hpp"

using namespace GI;

AY38910::AY38910() : _selected_register(0)
{
}

void AY38910::set_clock_rate(double clock_rate)
{
	set_input_rate((float)clock_rate);
}

void AY38910::get_samples(unsigned int number_of_samples, int16_t *target)
{
	printf("%d\n", number_of_samples);
	for(int c = 0; c < number_of_samples; c++)
	{
		*target++ = (c & 64) * 64;
	}
}

void AY38910::skip_samples(unsigned int number_of_samples)
{
}

void AY38910::select_register(uint8_t r)
{
	_selected_register = r & 0xf;
}

void AY38910::set_register_value(uint8_t value)
{
	_registers[_selected_register] = value;
	if(value < 14)
	{
		int selected_register = _selected_register;
		enqueue([=] () {
			_output_registers[selected_register] = value;
			switch(selected_register)
			{
				case 0: case 2: case 4:
					_tone_generator_controls[selected_register >> 1] =
						(_tone_generator_controls[selected_register >> 1] & ~0xff) | value;
				break;

				case 1: case 3: case 5:
					_tone_generator_controls[selected_register >> 1] =
						(_tone_generator_controls[selected_register >> 1] & 0xff) | (uint16_t)((value&0xf) << 8);
				break;

				case 11:
					_envelope_period = (_envelope_period & ~0xff) | value;
				break;

				case 12:
					_envelope_period = (_envelope_period & 0xff) | (uint16_t)(value << 8);
				break;
			}
		});
	}
}

uint8_t AY38910::get_register_value()
{
	return _registers[_selected_register];
}

uint8_t AY38910::get_port_output(bool port_b)
{
	return _registers[port_b ? 15 : 14];
}