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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
#ifndef MAME_MACHINE_WATCHDOG_H
#define MAME_MACHINE_WATCHDOG_H
#pragma once
//**************************************************************************
// DEVICE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_WATCHDOG_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, WATCHDOG_TIMER, 0)
#define MCFG_WATCHDOG_MODIFY(_tag) \
MCFG_DEVICE_MODIFY(_tag)
#define MCFG_WATCHDOG_VBLANK_INIT(_screen, _count) \
downcast<watchdog_timer_device &>(*device).set_vblank_count(_screen, _count);
#define MCFG_WATCHDOG_TIME_INIT(_time) \
downcast<watchdog_timer_device &>(*device).set_time(_time);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> watchdog_timer_device
class watchdog_timer_device : public device_t
{
public:
// construction/destruction
watchdog_timer_device(const machine_config &mconfig, const char *tag, device_t *owner)
: watchdog_timer_device(mconfig, tag, owner, (uint32_t)0)
{
}
watchdog_timer_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// inline configuration helpers
void set_vblank_count(const char *screen_tag, int32_t count) { m_screen_tag = screen_tag; m_vblank_count = count; }
void set_time(attotime time) { m_time = time; }
// watchdog control
void watchdog_reset();
void watchdog_enable(bool enable = true);
int32_t get_vblank_counter() const { return m_counter; }
// read/write handlers
DECLARE_WRITE8_MEMBER( reset_w );
DECLARE_READ8_MEMBER( reset_r );
DECLARE_WRITE16_MEMBER( reset16_w );
DECLARE_READ16_MEMBER( reset16_r );
DECLARE_WRITE32_MEMBER( reset32_w );
DECLARE_READ32_MEMBER( reset32_r );
protected:
// device-level overrides
virtual void device_validity_check(validity_checker &valid) const override;
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
private:
// internal helpers
void watchdog_fired();
void watchdog_vblank(screen_device &screen, bool vblank_state);
// configuration data
int32_t m_vblank_count; // number of VBLANKs until resetting the machine
attotime m_time; // length of time until resetting the machine
const char * m_screen_tag; // the tag of the screen this timer tracks
// internal state
bool m_enabled; // is the watchdog enabled?
int32_t m_counter; // counter for VBLANK tracking
emu_timer * m_timer; // timer for triggering reset
};
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DECLARE_DEVICE_TYPE(WATCHDOG_TIMER, watchdog_timer_device)
#endif // MAME_MACHINE_WATCHDOG_H
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