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// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller
/***************************************************************************
z80daisy.h
Z80/180 daisy chaining support functions.
***************************************************************************/
#pragma once
#ifndef __Z80DAISY_H__
#define __Z80DAISY_H__
//**************************************************************************
// CONSTANTS
//**************************************************************************
// these constants are returned from the irq_state function
const uint8_t Z80_DAISY_INT = 0x01; // interrupt request mask
const uint8_t Z80_DAISY_IEO = 0x02; // interrupt disable mask (IEO)
//**************************************************************************
// DEVICE CONFIGURATION MACROS
//**************************************************************************
// configure devices
#define MCFG_Z80_DAISY_CHAIN(_config) \
dynamic_cast<z80_daisy_chain_interface &>(*device).set_daisy_config(_config);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> z80_daisy_config
struct z80_daisy_config
{
const char * devname; // name of the device
};
// ======================> device_z80daisy_interface
class device_z80daisy_interface : public device_interface
{
friend class z80_daisy_chain_interface;
public:
// construction/destruction
device_z80daisy_interface(const machine_config &mconfig, device_t &device);
virtual ~device_z80daisy_interface();
// required operation overrides
virtual int z80daisy_irq_state() = 0;
virtual int z80daisy_irq_ack() = 0;
virtual void z80daisy_irq_reti() = 0;
private:
device_z80daisy_interface *m_daisy_next; // next device in the chain
};
// ======================> z80_daisy_chain_interface
class z80_daisy_chain_interface : public device_interface
{
public:
// construction/destruction
z80_daisy_chain_interface(const machine_config &mconfig, device_t &device);
virtual ~z80_daisy_chain_interface();
// configuration helpers
void set_daisy_config(const z80_daisy_config *config) { m_daisy_config = config; }
// getters
bool daisy_chain_present() const { return (m_chain != nullptr); }
std::string daisy_show_chain() const;
protected:
// interface-level overrides
virtual void interface_post_start() override;
virtual void interface_post_reset() override;
// initialization
void daisy_init(const z80_daisy_config *daisy);
// callbacks
int daisy_update_irq_state();
device_z80daisy_interface *daisy_get_irq_device();
void daisy_call_reti_device();
private:
const z80_daisy_config *m_daisy_config;
device_z80daisy_interface *m_chain; // head of the daisy chain
};
#endif
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