CLK/Machines/Apple/ADB/ReactiveDevice.hpp

//
//  ReactiveDevice.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 12/02/2021.
//  Copyright © 2021 Thomas Harte. All rights reserved.
//

#ifndef ReactiveDevice_hpp
#define ReactiveDevice_hpp

#include "Bus.hpp"

#include <atomic>
#include <cstddef>
#include <vector>

namespace Apple::ADB {

class ReactiveDevice: public Bus::Device {
	protected:
		ReactiveDevice(Bus &bus, uint8_t adb_device_id);

		void post_response(const std::vector<uint8_t> &&response);
		void post_service_request();
		void receive_bytes(size_t count);

		virtual void perform_command(const Command &command) = 0;
		virtual void did_receive_data(const Command &, const std::vector<uint8_t> &) {}

	private:
		void advance_state(double microseconds, bool current_level) override;
		void adb_bus_did_observe_event(Bus::Event event, uint8_t value) override;

	private:
		Bus &bus_;
		const size_t device_id_;

		std::vector<uint8_t> response_;
		int bit_offset_ = 0;
		double microseconds_at_bit_ = 0;

		enum class Phase {
			AwaitingAttention,
			AwaitingCommand,
			AwaitingContent,
			ServiceRequestPending,
		} phase_ = Phase::AwaitingAttention;
		std::vector<uint8_t> content_;
		size_t expected_content_size_ = 0;
		Command command_;
		bool stop_has_begin_ = false;

		uint16_t register3_;
		const uint8_t default_adb_device_id_;

		std::atomic<bool> service_desired_ = false;

		void reset();
};

}

#endif /* ReactiveDevice_hpp */