// license:BSD-3-Clause // copyright-holders:smf #include "emu.h" #include "clock.h" DEFINE_DEVICE_TYPE(CLOCK, clock_device, "clock", "Clock") clock_device::clock_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, CLOCK, tag, owner, clock), m_signal(0), m_timer(nullptr), m_signal_handler(*this) { } void clock_device::device_start() { m_signal_handler.resolve(); save_item(NAME(m_signal)); } void clock_device::device_clock_changed() { if (!m_signal_handler.isnull() && m_clock > 0) { if (m_timer == nullptr) m_timer = timer_alloc(0); const attotime period(attotime::from_hz(m_clock * 2)); attotime next = period - m_timer->elapsed(); if (next < attotime::zero) next = attotime::zero; m_timer->adjust(next, 0, period); } else if (m_timer != nullptr) m_timer->adjust(attotime::never); } void clock_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { m_signal = !m_signal; m_signal_handler(m_signal); }