void Emu::Cpu::updateTimer(uint16_t m) {
uint8_t tmc = emu->mmu->rb(0xFF07);
bool timerEnabled = ((tmc & 0x04) != 0);
if (timerEnabled) {
timerClocks -= m;
if (timerClocks <= 0) {
setTimerFreq();
if(emu->mmu->rb(0xFF05) == 0xFF) {
emu->mmu->wb(0xFF05, emu->mmu->rb(0xFF06));
requestInterrupt(Timer);
} else {
emu->mmu->wb(0xFF05, emu->mmu->rb(0xFF05) + 1);
}
}
}
}
signed int RtcTimer::initTimer(unsigned long desiredFrequency)
{
if(TIMER_DEBUG)
printf("RtcTimer::initTimer()\n");
if (timerFd != -1) {
fprintf(stderr,"RtcTimer::initTimer(): called on initialised timer!\n");
return -1;
}
MusEGlobal::doSetuid();
#ifdef _WIN32
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(showGPS()));
timer->start(15000); //time specified in ms
//https://stackoverflow.com/questions/19287550/how-to-call-a-function-after-every-15-seconds-using-qt
//http://doc.qt.io/qt-5/qtimer.html#details
//http://doc.qt.io/qt-5/qt.html#TimerType-enum
#else
timerFd = ::open("/dev/rtc", O_RDONLY);
if (timerFd == -1) {
fprintf(stderr, "fatal error: open /dev/rtc failed: %s\n", strerror(errno));
MusEGlobal::undoSetuid();
return timerFd;
}
if (!setTimerFreq(desiredFrequency)) {
// unable to set timer frequency
return -1;
}
// check if timer really works, start and stop it once.
if (!startTimer()) {
return -1;
}
if (!stopTimer()) {
return -1;
}
return timerFd;
#endif
}
