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DDP: Support sources that don't push

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If the source never sends the push flag, WLED buffers the update but
never publishes it to the LEDs.  This causes the confusing case where
the peek display shows one thing but the LEDs themselves something else.

Add a static flag that tracks if we've seen a push from the source;
until we do, apply every update as soon as it's received, per the DDP
specification.
This commit is contained in:
Will Miles 2024-03-18 19:46:33 -04:00
parent b849ea8eaa
commit 62f845a94e
1 changed files with 4 additions and 1 deletions
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5
wled00/e131.cpp
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@ -11,6 +11,7 @@
//DDP protocol support, called by handleE131Packet
//handles RGB data only
void handleDDPPacket(e131_packet_t* p) {
static bool ddpSeenPush = false; // have we seen a push yet?
int lastPushSeq = e131LastSequenceNumber[0];
//reject late packets belonging to previous frame (assuming 4 packets max. before push)
@ -34,6 +35,7 @@ void handleDDPPacket(e131_packet_t* p) {
uint16_t c = 0;
if (p->flags & DDP_TIMECODE_FLAG) c = 4; //packet has timecode flag, we do not support it, but data starts 4 bytes later
if (realtimeMode != REALTIME_MODE_DDP) ddpSeenPush = false; // just starting, no push yet
realtimeLock(realtimeTimeoutMs, REALTIME_MODE_DDP);
if (!realtimeOverride || (realtimeMode && useMainSegmentOnly)) {
@ -44,7 +46,8 @@ void handleDDPPacket(e131_packet_t* p) {
}
bool push = p->flags & DDP_PUSH_FLAG;
if (push) {
ddpSeenPush |= push;
if (!ddpSeenPush || push) { // if we've never seen a push, or this is one, render display
e131NewData = true;
byte sn = p->sequenceNum & 0xF;
if (sn) e131LastSequenceNumber[0] = sn;