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// license:BSD-3-Clause
// copyright-holders:AJR
/**********************************************************************
Generic binary ripple counter emulation
**********************************************************************/
#ifndef MAME_MACHINE_RIPPLE_COUNTER_H
#define MAME_MACHINE_RIPPLE_COUNTER_H
#pragma once
#include "dirom.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ripple_counter_device
class ripple_counter_device : public device_t, public device_rom_interface<14>
{
public:
// construction/destruction
ripple_counter_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
// configuration
void set_stages(u8 stages) { m_count_mask = (1U << stages) - 1; override_address_width(stages); }
auto count_out_cb() { return m_count_out_cb.bind(); }
auto rom_out_cb() { return m_rom_out_cb.bind(); }
// control line handlers
void clock_w(int state);
void reset_w(int state);
// getters
u32 count() const { return m_count; }
protected:
// device_t implementation
virtual void device_validity_check(validity_checker &valid) const override;
virtual void device_start() override ATTR_COLD;
virtual void device_clock_changed() override;
// device_rom_interface implementation
virtual space_config_vector memory_space_config() const override;
virtual void rom_bank_post_change() override;
TIMER_CALLBACK_MEMBER(advance_counter);
private:
// internal helpers
void set_count(u32 count);
// device callbacks
devcb_write32 m_count_out_cb;
devcb_write8 m_rom_out_cb;
// device timers
emu_timer *m_count_timer;
// configuration parameters
u32 m_count_mask;
// running state
u32 m_count;
bool m_clk;
bool m_reset;
};
// device type definition
DECLARE_DEVICE_TYPE(RIPPLE_COUNTER, ripple_counter_device)
#endif // MAME_MACHINE_RIPPLE_COUNTER_H
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