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Fixing issues with detection

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This commit is contained in:
Rodrigo Alfonso 2025-02-11 20:25:05 -03:00
parent ad7775740b
commit 1becbcfbb8
3 changed files with 27 additions and 18 deletions
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6
examples/LinkIR_demo/src/main.cpp
View File

@ -158,8 +158,10 @@ void receiveGeneric38kHzSignal() {
received += ", ";
received += std::to_string(pulses[i]);
}
received =
"Press START to retransmit\n" + std::to_string(i) + " // " + received;
u8 address, command;
bool isNEC = linkIR->parseNEC(pulses, address, command);
received = "Press START to resend (NEC=" + std::to_string(isNEC) + ")\n" +
std::to_string(i) + " // " + received;
Common::log(received);
} else {
Common::log("No signal detected!\n\nPress START");

35
lib/LinkIR.hpp
View File

@ -157,7 +157,7 @@ class LinkIR {
/**
* Receives a signal and returns whether it's a NEC signal or not. If it is,
* the `address` and `command` will be filled.
* the `address` and `command` will be filled. Returns `true` on success.
* @param address The read 8-bit address, specifying the device.
* @param command The read 8-bit command, specifying the action.
* @param startTimeout Number of microseconds before the first *mark* to abort
@ -167,37 +167,41 @@ class LinkIR {
if (!isEnabled)
return false;
u32 bufferSize = NEC_TOTAL_PULSES * 3;
u16 pulses[bufferSize];
if (!receive(pulses, bufferSize, startTimeout))
u16 pulses[NEC_TOTAL_PULSES];
if (!receive(pulses, NEC_TOTAL_PULSES, startTimeout))
return false;
u32 cursor = 0;
while (cursor < bufferSize &&
!isWithinNECTolerance(pulses[cursor], NEC_LEADER_MARK))
cursor++;
return parseNEC(pulses, address, command);
}
if (cursor + NEC_TOTAL_PULSES >= bufferSize)
/**
* Tries to interpret an already received array of `pulses` as a NEC signal.
* @param pulses The pulses to interpret. Returns `true` on success.
* @param address The read 8-bit address, specifying the device.
* @param command The read 8-bit command, specifying the action.
*/
bool parseNEC(u16 pulses[], u8& address, u8& command) {
if (!isEnabled)
return false;
if (!isWithinNECTolerance(pulses[cursor + 0], NEC_LEADER_MARK))
if (!isWithinNECTolerance(pulses[0], NEC_LEADER_MARK))
return false;
if (!isWithinNECTolerance(pulses[cursor + 1], NEC_LEADER_SPACE))
if (!isWithinNECTolerance(pulses[1], NEC_LEADER_SPACE))
return false;
u32 data = 0;
for (u32 bit = 0; bit < 32; bit++) {
u32 markIndex = 2 + bit * 2;
u32 spaceIndex = markIndex + 1;
if (!isWithinNECTolerance(pulses[cursor + markIndex], NEC_PULSE))
if (!isWithinNECTolerance(pulses[markIndex], NEC_PULSE))
return false;
u16 space = pulses[cursor + spaceIndex];
u16 space = pulses[spaceIndex];
if (isWithinNECTolerance(space, NEC_SPACE_1))
data |= 1 << bit;
else if (!isWithinNECTolerance(space, NEC_SPACE_0))
return false;
}
if (!isWithinNECTolerance(pulses[cursor + 66], NEC_PULSE))
if (!isWithinNECTolerance(pulses[66], NEC_PULSE))
return false;
u8 addr = data & 0xFF;
@ -301,6 +305,9 @@ class LinkIR {
}
bool isWithinNECTolerance(u16 measured, u16 expected) {
if (measured == 0)
return false;
u32 tolerance = (expected * NEC_TOLERANCE_PERCENTAGE) / 100;
return measured >= expected - tolerance && measured <= expected + tolerance;
}

4
lib/iwram_code/LinkIR.cpp
View File

@ -54,7 +54,7 @@ LINK_CODE_IWRAM bool LinkIR::receive(u16 pulses[],
u32 pulseDuration = (currentFirstLightTime - lastTransitionTime) /
CYCLES_PER_MICROSECOND;
pulses[pulseIndex++] = pulseDuration;
if ((int)pulseIndex >= (int)maxEntries - 2)
if (pulseIndex >= maxEntries - 1)
break;
}
isMark = true;
@ -69,7 +69,7 @@ LINK_CODE_IWRAM bool LinkIR::receive(u16 pulses[],
u32 pulseDuration =
(currentLastLightTime - lastTransitionTime) / CYCLES_PER_MICROSECOND;
pulses[pulseIndex++] = pulseDuration;
if ((int)pulseIndex >= (int)maxEntries - 2)
if (pulseIndex >= maxEntries - 1)
break;
isMark = false;
lastTransitionTime = currentLastLightTime;