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Stop estimating transition time

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This commit is contained in:
Rodrigo Alfonso 2025-02-11 02:13:25 -03:00
parent c26e06e0b7
commit 965e927e3a
1 changed files with 9 additions and 12 deletions
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21
lib/iwram_code/LinkIR.cpp
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@ -30,7 +30,6 @@ LINK_CODE_IWRAM bool LinkIR::receive(u16 pulses[],
bool hasStarted = false;
bool isMark = false;
u32 pulseIndex = 0;
u32 initialTime = 0;
u32 lastTransitionTime = 0;
@ -54,37 +53,35 @@ LINK_CODE_IWRAM bool LinkIR::receive(u16 pulses[],
}
bool isCarrierPresent = transitionsCount >= DEMODULATION_MIN_TRANSITIONS;
u32 transitionTime = getCount();
// new transition?
if (isCarrierPresent != isMark) {
// estimate transition time as the middle of the current window
u32 estimatedNow = windowStart + DEMODULATION_SAMPLE_WINDOW_CYCLES / 2;
if (!hasStarted && isCarrierPresent) {
// first mark initializes the capture
hasStarted = true;
lastTransitionTime = estimatedNow;
lastTransitionTime = transitionTime;
} else if (hasStarted) {
// record the pulse duration in microseconds
if (pulseIndex >= maxEntries - 1)
break;
u32 pulseDuration =
(estimatedNow - lastTransitionTime) / CYCLES_PER_MICROSECOND;
(transitionTime - lastTransitionTime) / CYCLES_PER_MICROSECOND;
pulses[pulseIndex++] = pulseDuration;
lastTransitionTime = estimatedNow;
lastTransitionTime = transitionTime;
}
isMark = isCarrierPresent;
}
// if we've started and we're in a space, check for `signalTimeout`
// if we've started and we're in a space, check for timeout
if (hasStarted && !isMark &&
(getCount() - lastTransitionTime) / CYCLES_PER_MICROSECOND >=
signalTimeout)
((getCount() - lastTransitionTime) / CYCLES_PER_MICROSECOND >=
signalTimeout))
break;
// if we haven't started and we've waited longer than `startTimeout`, then
// timeout too
// if we haven't started and we've waited too long, timeout too
if (!hasStarted &&
(getCount() - initialTime) / CYCLES_PER_MICROSECOND >= startTimeout)
((getCount() - initialTime) / CYCLES_PER_MICROSECOND >= startTimeout))
break;
}