void
C64::synchronizeTiming()
{
const uint64_t earlyWakeup = 1500000; /* 1.5 milliseconds */
const uint64_t maxJitter = 1000000000; /* 1 second */
// Convert usec into kernel unit and sleep
uint64_t kernelTargetTime = nanos_to_abs(nanoTargetTime);
int64_t jitter = sleepUntil(kernelTargetTime, earlyWakeup);
// Update target time
nanoTargetTime += vic->getFrameDelay();
// debug(2, "Jitter = %d", jitter);
if (jitter > maxJitter) {
// The emulator did not keep up with the real time clock. Instead of
// running behind for a long time, we reset the synchronization timer
debug(2, "Jitter exceeds limit. Restarting synchronization timer.\n");
restartTimer();
}
#if 0
// Old sleep
// determine how long we should wait
uint64_t timeToSleep = targetTime - usec();
targetTime += vic->getFrameDelay() / 1000; // OLD
if (timeToSleep > 0) {
sleepMicrosec(timeToSleep);
} else {
restartTimer();
}
#endif
}
void
C64::runstopRestore()
{
// Note: The restore key is directly connected to the NMI line of the CPU
// Thus, the runstop/restore key combination triggers an interrupts that causes a soft reset
keyboard->pressRunstopKey();
cpu->setNMILineReset();
// Hold runstop key down for a while...
sleepMicrosec((uint64_t)100000);
keyboard->releaseRunstopKey();
}
void
C64::runstopRestore()
{
// Press runstop
keyboard.pressRunstopKey();
// Press restore
restore();
// Hold down runstop key for a while...
sleepMicrosec((uint64_t)100000);
keyboard.releaseRunstopKey();
}
void
VC1541::ejectDisk()
{
if (!hasDisk())
return;
// Open lid (write protection light barrier will be blocked)
setWriteProtection(true);
// Drive will notice the change in its interrupt routine...
sleepMicrosec((uint64_t)200000);
// Remove disk (write protection light barrier is no longer blocked)
setWriteProtection(false);
resetDisk();
c64->putMessage(MSG_VC1541_DISK, 0);
if (sendSoundMessages)
c64->putMessage(MSG_VC1541_DISK_SOUND, 0);
}
void
VC1541::ejectDisk()
{
if (!hasDisk())
return;
// Open lid (this blocks the light barrier)
setDiskPartiallyInserted(true);
// Let the drive notice the blocked light barrier in its interrupt routine ...
sleepMicrosec((uint64_t)200000);
// Erase disk data and reset write protection flag
resetDisk();
// Remove disk (this unblocks the light barrier)
setDiskPartiallyInserted(false);
// Notify listener
c64->putMessage(MSG_VC1541_DISK, 0);
if (sendSoundMessages)
c64->putMessage(MSG_VC1541_DISK_SOUND, 0);
}
