uint32_t Port::computeSteadyStateInputShiftReg()
{
Signal current = getEffectiveDataPortInputPinsValue();
assert(!current.isClock());
uint32_t val = current.getValue(time);
unsigned width = shiftRegEntries;
unsigned shift = getPortWidth();
while (width > 1) {
val = (val << shift) | val;
width >>= 1;
shift *= 2;
}
val &= makeMask(getTransferWidth());
return val;
}
void ClockBlock::
setValue(const Signal &newValue, ticks_t time)
{
if (newValue == value)
return;
if (isFixedFrequency() || newValue.isClock())
updateAttachedPorts(time);
uint32_t oldValue = value.getValue(time);
value = newValue;
if (!running)
return;
if (value.getValue(time) != oldValue) {
seeEdgeOnAttachedPorts(oldValue == 0 ? Edge::RISING : Edge::FALLING, time);
}
if (isFixedFrequency()) {
seeChangeOnAttachedPorts(time);
}
}
void LCDScreen::seeCLKChange(const Signal &newSignal, ticks_t time)
{
CLKSignal = newSignal;
uint32_t newValue = CLKSignal.getValue(time);
if (newValue != CLKValue) {
CLKValue = newValue;
if (CLKValue)
seeSamplingEdge(time);
}
if (CLKSignal.isClock()) {
EdgeIterator nextEdge = CLKSignal.getEdgeIterator(time);
if (nextEdge->type != Edge::RISING)
++nextEdge;
scheduleSamplingEdge(nextEdge->time);
} else if (scheduleReason != SCHEDULE_POLL_FOR_EVENTS) {
schedulePollForEvents(time + minUpdateTicks);
}
}
void LCDScreen::run(ticks_t time)
{
switch (scheduleReason) {
case SCHEDULE_SAMPLING_EDGE:
assert(CLKSignal.isClock());
seeSamplingEdge(time);
if (time - lastPollForEvents >= minUpdateTicks) {
if (screen.pollForEvents()) {
throw ExitException(time, 0);
}
lastPollForEvents = time;
}
scheduleSamplingEdge(time + CLKSignal.getPeriod());
break;
case SCHEDULE_POLL_FOR_EVENTS:
if (screen.pollForEvents()) {
throw ExitException(time, 0);
}
schedulePollForEvents(time + minUpdateTicks);
lastPollForEvents = time;
break;
}
}