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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
//**************************************************************************
// CONFIGURATION MACROS
//**************************************************************************
#define MCFG_RIPPLE_COUNTER_STAGES(_stages) \
downcast<ripple_counter_device &>(*device).set_stages(_stages);
// output callbacks
#define MCFG_RIPPLE_COUNTER_COUNT_OUT_CB(_devcb) \
devcb = &downcast<ripple_counter_device &>(*device).set_count_out_cb(DEVCB_##_devcb);
#define MCFG_RIPPLE_COUNTER_ROM_OUT_CB(_devcb) \
devcb = &downcast<ripple_counter_device &>(*device).set_rom_out_cb(DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ripple_counter_device
class ripple_counter_device : public device_t, public device_rom_interface
{
public:
// construction/destruction
ripple_counter_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
// configuration
void set_stages(u8 stages) { m_count_mask = (1U << stages) - 1; set_rom_addr_width(stages); }
template<class Object> devcb_base &set_count_out_cb(Object &&cb) { return m_count_out_cb.set_callback(std::forward<Object>(cb)); }
template<class Object> devcb_base &set_rom_out_cb(Object &&cb) { return m_rom_out_cb.set_callback(std::forward<Object>(cb)); }
// control line handlers
DECLARE_WRITE_LINE_MEMBER(clock_w);
DECLARE_WRITE_LINE_MEMBER(reset_w);
// getters
u32 count() const { return m_count; }
protected:
// device-level overrides
virtual void device_validity_check(validity_checker &valid) const override;
virtual void device_resolve_objects() override;
virtual void device_start() override;
virtual void device_clock_changed() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
// device_rom_interface overrides
virtual space_config_vector memory_space_config() const override;
virtual void rom_bank_updated() override;
private:
// internal helpers
void set_count(u32 count);
// device callbacks
devcb_write32 m_count_out_cb;
devcb_write8 m_rom_out_cb;
// device timers
enum
{
TIMER_COUNT
};
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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