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/***************************************************************************
RIOT 6532 emulation
***************************************************************************/
#pragma once
#ifndef __RIOT6532_H__
#define __RIOT6532_H__
#include "emu.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_RIOT6532_ADD(_tag, _clock, _intrf) \
MCFG_DEVICE_ADD(_tag, RIOT6532, _clock) \
MCFG_DEVICE_CONFIG(_intrf)
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> riot6532_interface
struct riot6532_interface
{
devcb_read8 m_in_a_cb;
devcb_read8 m_in_b_cb;
devcb_write8 m_out_a_cb;
devcb_write8 m_out_b_cb;
devcb_write_line m_irq_cb;
};
// ======================> riot6532_device
class riot6532_device : public device_t,
public riot6532_interface
{
public:
// construction/destruction
riot6532_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
UINT8 reg_r(UINT8 offset, bool debugger_access = false);
void reg_w(UINT8 offset, UINT8 data);
void porta_in_set(UINT8 data, UINT8 mask);
void portb_in_set(UINT8 data, UINT8 mask);
UINT8 porta_in_get();
UINT8 portb_in_get();
UINT8 porta_out_get();
UINT8 portb_out_get();
void timer_end();
protected:
class riot6532_port
{
public:
UINT8 m_in;
UINT8 m_out;
UINT8 m_ddr;
devcb_resolved_read8 m_in_func;
devcb_resolved_write8 m_out_func;
};
// device-level overrides
virtual void device_config_complete();
virtual void device_start();
virtual void device_reset();
virtual void device_post_load() { }
virtual void device_clock_changed() { }
static TIMER_CALLBACK( timer_end_callback );
private:
void update_irqstate();
UINT8 apply_ddr(const riot6532_port *port);
void update_pa7_state();
UINT8 get_timer();
riot6532_port m_port[2];
devcb_resolved_write_line m_irq_func;
UINT8 m_irqstate;
UINT8 m_irqenable;
int m_irq;
UINT8 m_pa7dir; /* 0x80 = high-to-low, 0x00 = low-to-high */
UINT8 m_pa7prev;
UINT8 m_timershift;
UINT8 m_timerstate;
emu_timer * m_timer;
};
// device type definition
extern const device_type RIOT6532;
#endif
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