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ESP32 bugfix packet buffer race

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This commit is contained in:
Harald Barth 2025-01-17 19:12:11 +01:00
parent 0476b9c1d8
commit c28965c58d
2 changed files with 12 additions and 8 deletions
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6
DCCRMT.h
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@ -44,6 +44,12 @@ class RMTChannel {
return true; return true;
return dataReady; return dataReady;
}; };
inline void waitForDataCopy() {
while(1) { // do nothing and wait for interrupt clearing dataReady to happen
if (dataReady == false)
break;
}
};
inline uint32_t packetCount() { return packetCounter; }; inline uint32_t packetCount() { return packetCounter; };
private: private:

12
DCCWaveform.cpp
View File

@ -278,7 +278,11 @@ void DCCWaveform::begin() {
void DCCWaveform::schedulePacket(const byte buffer[], byte byteCount, byte repeats) { void DCCWaveform::schedulePacket(const byte buffer[], byte byteCount, byte repeats) {
if (byteCount > MAX_PACKET_SIZE) return; // allow for chksum if (byteCount > MAX_PACKET_SIZE) return; // allow for chksum
RMTChannel *rmtchannel = (isMainTrack ? rmtMainChannel : rmtProgChannel);
if (rmtchannel == NULL)
return; // no idea to prepare packet if we can not send it anyway
rmtchannel->waitForDataCopy(); // blocking wait so we can write into buffer
byte checksum = 0; byte checksum = 0;
for (byte b = 0; b < byteCount; b++) { for (byte b = 0; b < byteCount; b++) {
checksum ^= buffer[b]; checksum ^= buffer[b];
@ -296,13 +300,7 @@ void DCCWaveform::schedulePacket(const byte buffer[], byte byteCount, byte repea
{ {
int ret = 0; int ret = 0;
do { do {
if(isMainTrack) { ret = rmtchannel->RMTfillData(pendingPacket, pendingLength, pendingRepeats);
if (rmtMainChannel != NULL)
ret = rmtMainChannel->RMTfillData(pendingPacket, pendingLength, pendingRepeats);
} else {
if (rmtProgChannel != NULL)
ret = rmtProgChannel->RMTfillData(pendingPacket, pendingLength, pendingRepeats);
}
} while(ret > 0); } while(ret > 0);
} }
} }