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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*********************************************************************

    microdrv.h

    MESS interface to the Sinclair Microdrive image abstraction code

*********************************************************************/

#ifndef MAME_MACHINE_MICRODRV_H
#define MAME_MACHINE_MICRODRV_H

#pragma once

#include "softlist_dev.h"


//**************************************************************************
//  INTERFACE CONFIGURATION MACROS
//**************************************************************************

#define MDV_1 "mdv1"
#define MDV_2 "mdv2"


#define MCFG_MICRODRIVE_ADD(_tag) \
	MCFG_DEVICE_ADD(_tag, MICRODRIVE, 0)

#define MCFG_MICRODRIVE_COMMS_OUT_CALLBACK(_write) \
	devcb = &downcast<microdrive_image_device &>(*device).set_comms_out_wr_callback(DEVCB_##_write);



/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

// ======================> microdrive_image_device

class microdrive_image_device : public device_t,
								public device_image_interface
{
public:
	// construction/destruction
	microdrive_image_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
	virtual ~microdrive_image_device();

	template <class Object> devcb_base &set_comms_out_wr_callback(Object &&cb) { return m_write_comms_out.set_callback(std::forward<Object>(cb)); }

	// image-level overrides
	virtual image_init_result call_load() override;
	virtual void call_unload() override;
	virtual const software_list_loader &get_software_list_loader() const override { return image_software_list_loader::instance(); }

	virtual iodevice_t image_type() const override { return IO_CASSETTE; }

	virtual bool is_readable()  const override { return 1; }
	virtual bool is_writeable() const override { return 1; }
	virtual bool is_creatable() const override { return 0; }
	virtual bool must_be_loaded() const override { return 0; }
	virtual bool is_reset_on_load() const override { return 0; }
	virtual const char *image_interface() const override { return "ql_cass"; }
	virtual const char *file_extensions() const override { return "mdv"; }

	// specific implementation
	DECLARE_WRITE_LINE_MEMBER( clk_w );
	DECLARE_WRITE_LINE_MEMBER( comms_in_w );
	DECLARE_WRITE_LINE_MEMBER( erase_w );
	DECLARE_WRITE_LINE_MEMBER( read_write_w );
	DECLARE_WRITE_LINE_MEMBER( data1_w );
	DECLARE_WRITE_LINE_MEMBER( data2_w );
	DECLARE_READ_LINE_MEMBER ( data1_r );
	DECLARE_READ_LINE_MEMBER ( data2_r );

protected:
	// device-level overrides
	virtual void device_start() override;
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
private:
	devcb_write_line m_write_comms_out;

	int m_clk;
	int m_comms_in;
	int m_comms_out;
	int m_erase;
	int m_read_write;

	std::unique_ptr<uint8_t[]> m_left;
	std::unique_ptr<uint8_t[]> m_right;

	int m_bit_offset;
	int m_byte_offset;

	emu_timer *m_bit_timer;
};


// device type definition
DECLARE_DEVICE_TYPE(MICRODRIVE, microdrive_image_device)

#endif // MAME_MACHINE_MICRODRV_H