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msm58321: Correct duty cycle for busy output

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This commit is contained in:
AJR 2018-04-27 20:16:25 -04:00
parent 0691811588
commit 84c1dfac07
1 changed files with 9 additions and 3 deletions
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12
src/devices/machine/msm58321.cpp
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@ -221,10 +221,11 @@ void msm58321_device::device_start()
// allocate timers
m_clock_timer = timer_alloc(TIMER_CLOCK);
m_clock_timer->adjust(attotime::from_hz(clock() / 32768), 0, attotime::from_hz(clock() / 32768));
m_clock_timer->adjust(clocks_to_attotime(32768), 0, clocks_to_attotime(32768));
// busy signal active period is approximately 427 µs
m_busy_timer = timer_alloc(TIMER_BUSY);
m_busy_timer->adjust(attotime::from_hz(clock() / 16384), 0, attotime::from_hz(clock() / 16384));
m_busy_timer->adjust(clocks_to_attotime(32768 - 14), 0, clocks_to_attotime(32768));
// state saving
save_item(NAME(m_cs2));
@ -259,12 +260,17 @@ void msm58321_device::device_timer(emu_timer &timer, device_timer_id id, int par
case TIMER_CLOCK:
if (!m_stop)
advance_seconds();
if (!m_busy)
{
m_busy = 1;
m_busy_handler(m_busy);
}
break;
case TIMER_BUSY:
if (!m_cs1 || !m_cs2 || !m_write || m_address != REGISTER_RESET)
{
m_busy = !m_busy;
m_busy = 0;
m_busy_handler(m_busy);
}
break;