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Removed local buffer as WiFiUDP loops over input array anyways

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This commit is contained in:
Phil Bolduc 2021-09-20 20:47:48 -07:00
parent 109bb62209
commit fd8d17c5e5
1 changed files with 32 additions and 35 deletions
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67
wled00/udp.cpp
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@ -546,9 +546,10 @@ void sendSysInfoUDP()
// length - the number of pixels
// buffer - a buffer of at least length*4 bytes long
// isRGBW - true if the buffer contains 4 components per pixel
//
uint8_t realtimeBroadcast(IPAddress client, uint16_t length, uint8_t *buffer, bool isRGBW) {
uint8_t sequenceNumber = 0; // this needs to be shared across all outputs
uint8_t realtimeBroadcast(IPAddress client, uint16_t length, uint8_t *buffer, bool isRGBW) {
WiFiUDP ddpUdp;
// calclate the number of UDP packets we need to send
@ -558,52 +559,47 @@ uint8_t realtimeBroadcast(IPAddress client, uint16_t length, uint8_t *buffer, bo
packetCount++;
}
// allocatea buffer on the stack for the UDP packet
uint8_t header[DDP_HEADER_LEN] = { 0 };
// set common header values
header[0] = DDP_FLAGS1_VER1;
header[2] = 1;
header[3] = DDP_ID_DISPLAY;
// there are 3 channels per RGB pixel
uint16_t channel = 0; // TODO: allow specifying the start channel
// the current position in the buffer
uint16_t bufferOffset = 0;
for (uint16_t currentPacket = 0; currentPacket < packetCount; currentPacket++) {
// the amount of data is AFTER the header in the current packet
uint16_t packetSize = DDP_CHANNELS_PER_PACKET;
if (currentPacket == (packetCount - 1)) {
// last packet, set the push flag
// TODO: determine if we want to send an empty push packet to each destination after sending the pixel data
header[0] = DDP_FLAGS1_VER1 | DDP_FLAGS1_PUSH;
if (channelCount % DDP_CHANNELS_PER_PACKET) {
packetSize = channelCount % DDP_CHANNELS_PER_PACKET;
}
}
// data offset in bytes, 32-bit number, MSB first
header[4] = (channel & 0xFF000000) >> 24;
header[5] = (channel & 0xFF0000) >> 16;
header[6] = (channel & 0xFF00) >> 8;
header[7] = (channel & 0xFF);
// data length in bytes, 16-bit number, MSB first
header[8] = (packetSize & 0xFF00) >> 8;
header[9] = packetSize & 0xFF;
if (sequenceNumber > 15) sequenceNumber = 0;
int rc = ddpUdp.beginPacket(client, DDP_PORT);
if (rc == 0) {
//DEBUG_PRINTLN("WiFiUDP.beginPacket returned an error");
return 1; // problem
}
// the amount of data is AFTER the header in the current packet
uint16_t packetSize = DDP_CHANNELS_PER_PACKET;
uint8_t flags = DDP_FLAGS1_VER1;
if (currentPacket == (packetCount - 1)) {
// last packet, set the push flag
// TODO: determine if we want to send an empty push packet to each destination after sending the pixel data
flags = DDP_FLAGS1_VER1 | DDP_FLAGS1_PUSH;
if (channelCount % DDP_CHANNELS_PER_PACKET) {
packetSize = channelCount % DDP_CHANNELS_PER_PACKET;
}
}
// write the header
ddpUdp.write(header, DDP_HEADER_LEN);
/*0*/ddpUdp.write(flags);
/*1*/ddpUdp.write(sequenceNumber++ & 0xF);
/*2*/ddpUdp.write(0);
/*3*/ddpUdp.write(DDP_ID_DISPLAY);
// data offset in bytes, 32-bit number, MSB first
/*4*/ddpUdp.write((channel & 0xFF000000) >> 24);
/*5*/ddpUdp.write((channel & 0x00FF0000) >> 16);
/*6*/ddpUdp.write((channel & 0x0000FF00) >> 8);
/*7*/ddpUdp.write((channel & 0x000000FF));
// data length in bytes, 16-bit number, MSB first
/*8*/ddpUdp.write((packetSize & 0xFF00) >> 8);
/*9*/ddpUdp.write(packetSize & 0xFF);
// write the colors, the write write(const uint8_t *buffer, size_t size)
// function is just a loop internally too
for (uint16_t i = 0; i < packetSize; i += 3) {
@ -612,6 +608,7 @@ uint8_t realtimeBroadcast(IPAddress client, uint16_t length, uint8_t *buffer, bo
ddpUdp.write(buffer[bufferOffset++]); // B
if (isRGBW) bufferOffset++;
}
rc = ddpUdp.endPacket();
if (rc == 0) {
//DEBUG_PRINTLN("WiFiUDP.endPacket returned an error");