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Attempts to factor in event counting direction.

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This commit is contained in:
Thomas Harte 2019-11-18 22:37:20 -05:00
parent ade8df7217
commit 0ce5057fd9
1 changed files with 4 additions and 1 deletions
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5
Components/68901/MFP68901.cpp
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@ -232,7 +232,10 @@ void MFP68901::set_timer_event_input(int channel, bool value) {
if(timers_[channel].event_input == value) return;
timers_[channel].event_input = value;
if(timers_[channel].mode == TimerMode::EventCount && !value) { /* TODO: which edge is counted? "as defined by the associated Interrupt Channel’s edge bit"? */
if(timers_[channel].mode == TimerMode::EventCount && (value == !!(gpip_active_edge_ & (0x10 >> channel)))) {
// "The active state of the signal on TAI or TBI is dependent upon the associated
// Interrupt Channel’s edge bit (GPIP 4 for TAI and GPIP 3 for TBI [...] ).
// If the edge bit associated with the TAI or TBI input is a one, it will be active high.
decrement_timer(channel, 1);
}
}