Hi
here is my main for the program i'm trying to get to work with the udp socket but the ethernetinterface just doesnt seem to be able to cope with the speed
data is sent from a media server in 530 byte udp packets and within each data packet is 512 bytes of dimmer level data and an artnet header and a universe number of that packets destination
it is 100 packets sent at approx 25hz so 4 packets are sent each time followed by a wait of approx 20-30ms and 4 more packets are sent and so on
the receive software above retrieves the packets and we check inbuffer[14] which contains the universe of the packet we need to work with and we need to check if its one of ours rxport1 to rxport4 if its one of ours we copy into universe 1 to 4
the issue is this wont recieive any more than 2 universes at a time so we can receive universe 1 & 2 but it will ignore 3 & 4 could this be a buffer issue with the first 2 packets coming in but the next 2 packets are being discarded and the delay between groups of 4 packets allow packets 1 & 2 to be worked on
if possible could someone from MBED please have a look at this situation as i am now stuck and cant move forward
looking forward to a solution to this problem
many thanks
Chris
int main (void)
{
EthernetInterface eth;
eth.init("2.0.0.2","255.0.0.0","2.0.0.1"); //we will use the mac address eventualy to create the unique ip address
eth.connect();
UDPSocket server;
server.bind(artnet_port);
server.enableBroadcast();
Endpoint client;
while (true) {//b
int n = server.receiveFrom(client, in_buffer, sizeof(in_buffer));
if (n > 0) {
opcode = in_buffer[9];//art poll opcode 20 art poll 50 artdmx
universelow = in_buffer[14];//dmx universe we wish to use
switch (opcode) {//c
case 0x20: { // its art poll request//d
memcpy (out_buffer,reply_packet,240);// put reply packet in buffer prior to sending
server.sendTo(client, out_buffer, 240);//send artpoll reply to interogating controller
}//d
break;
case 0x50: { //art output//e
//2
rxport1 = 0x09;
rxport2 = 0x0a;
rxport3 = 0x0b;
rxport4 = 0x0c;
if (rxport1 == universelow ) {
ledtest1 = 1;
uni1 =1;//toggle pin for my reference
memcpy(universe1,in_buffer,n);// this transfers in 5us
uni1 = 0;//toggle pin for my reference
ledtest1 = 0;
}
if (rxport2 == universelow) {
ledtest2 = 1;
uni2 =1;//toggle pin for my reference
memcpy(universe2,in_buffer,n);//this transfers in 10us
uni2 = 0;//toggle pin for my reference
ledtest2 = 0;
}
if (rxport3 == universelow) {
ledtest3 = 1;
uni3 =1;//toggle pin for my reference
memcpy(universe3,in_buffer,n);//we dont get here unless we switch off the send to rxport 1 or 2
uni3= 0;//toggle pin for my reference
ledtest3 = 0;
}
if (rxport4 == universelow) {
ledtest4 = 1;
uni4 =1;//toggle pin for my reference
memcpy(universe4,in_buffer,n);//we dont get here unless we switch off the send to rxport 1 or 2
uni4 = 0;//toggle pin for my reference
ledtest4 = 0;
}
break;
default:
break;
i have a couple of questions about the new stack what is the frequency that the rtos checks the ethernet stack for a new packet ? if quite slow can it be increased up ?
i have an application which is sending 530 byte udp packets approx 100 per second and the system will recieve 2 then miss 2 and just keep doing this
if i set the sending machine to 10mb and the mbed to 100mb i can see all 4 packets at a time but i cant be guaranteed the sending machine will be 10mb
if i set the mbed to 10mb and the sending machine to 100mb it will receive 3 packets and ignore the 4th and keep doing that
is there some low level buffer which is getting filled and not emptied hence missing packets by being overwritten could the buffer be made bigger or get the rtos to check more frequently
any suggestions welcome
many thanks
chris