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Allow devices with execute interface to have a clock of zero, they are suspended and restarted on clock change. Note that the device still needs to have a clock before MAME actually starts executing timeslices.

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This commit is contained in:
Dirk Best 2013-06-14 11:45:23 +00:00
parent 4af856c7aa
commit 9fd839af51
2 changed files with 19 additions and 3 deletions
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21
src/emu/diexec.c
View File

@ -638,6 +638,17 @@ void device_execute_interface::interface_post_reset()
void device_execute_interface::interface_clock_changed()
{
// a clock of zero disables the device
if (device().clock() == 0)
{
suspend(SUSPEND_REASON_CLOCK, true);
return;
}
// if we were suspended because we had no clock, enable us now
if (suspended(SUSPEND_REASON_CLOCK))
resume(SUSPEND_REASON_CLOCK);
// recompute cps and spc
m_cycles_per_second = clocks_to_cycles(device().clock());
m_attoseconds_per_cycle = HZ_TO_ATTOSECONDS(m_cycles_per_second);
@ -693,7 +704,11 @@ int device_execute_interface::standard_irq_callback(int irqline)
attoseconds_t device_execute_interface::minimum_quantum() const
{
// if we don't have that information, compute it
// if we don't have a clock, return a huge factor
if (device().clock() == 0)
return ATTOSECONDS_PER_SECOND - 1;
// if we don't have the quantum time, compute it
attoseconds_t basetick = m_attoseconds_per_cycle;
if (basetick == 0)
basetick = HZ_TO_ATTOSECONDS(clocks_to_cycles(device().clock()));
@ -727,7 +742,7 @@ void device_execute_interface::on_vblank(screen_device &screen, bool vblank_stat
return;
// generate the interrupt callback
if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE))
if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE | SUSPEND_REASON_CLOCK))
{
if (m_vblank_interrupt_legacy != NULL)
(*m_vblank_interrupt_legacy)(&device());
@ -750,7 +765,7 @@ TIMER_CALLBACK( device_execute_interface::static_trigger_periodic_interrupt )
void device_execute_interface::trigger_periodic_interrupt()
{
// bail if there is no routine
if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE))
if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE | SUSPEND_REASON_CLOCK))
{
if (m_timed_interrupt_legacy != NULL)
(*m_timed_interrupt_legacy)(&device());

1
src/emu/diexec.h
View File

@ -58,6 +58,7 @@ const UINT32 SUSPEND_REASON_SPIN = 0x0004; // currently spinning
const UINT32 SUSPEND_REASON_TRIGGER = 0x0008; // waiting for a trigger
const UINT32 SUSPEND_REASON_DISABLE = 0x0010; // disabled (due to disable flag)
const UINT32 SUSPEND_REASON_TIMESLICE = 0x0020; // waiting for the next timeslice
const UINT32 SUSPEND_REASON_CLOCK = 0x0040; // currently not clocked
const UINT32 SUSPEND_ANY_REASON = ~0; // all of the above