I recently started using the w5100 ethernet chip, and the ping the ping test went fine. I am able to set the GWR, SUBR, SHAR, SIPR registers and also read them back just fine (to verify they are being set correctly).
I am also able to open up an UDP socket (I am trying to sent a packet to a NTP server on port 123).
However when I write the SnDIPR and SNPORT for socket 0, when I read the back I get all 0’s.
Reading MR : 0<\r>
IP Address : 192.168.0.180<\r>
Subnet Mask : 255.255.255.0<\r>
Gateway Address : 192.168.0.1<\r>
Gateway Address : 48.02.2A.32.00.82<\r>
Socket 0 open in UDP @ source port 123<\r>
Socket 0 Destination IP: 0.0.0.0<\r>
Socket 0 Destination Port : 0.0<\r>
As per the datasheet, under SnDIPR … “In UDP mode, this register value decided to user’s written value after receiving peer’s ARP response. Before receiving peer’s ARP response, this register has reset value.”
My code is:
[code]//set destination ntp ip address
val=165; val=193; val=126; val=229;
ETHERNET_WRITE(SOCKET_0_BASE + SNDIPR, val, 4);
retval = ETHERNET_READ(SOCKET_0_BASE + SNDIPR, 4);
printf(“Socket 0 Destination IP: %u.%u.%u.%u\r”,retval,retval,retval,retval);
//set destination port
val = 0x00;
val = 0x7B;
ETHERNET_WRITE(SOCKET_0_BASE + SNDPORT, val, 2);
retval = ETHERNET_READ(SOCKET_0_BASE + SNDPORT, 2);
printf(“Socket 0 Destination Port : %u.%u\r”,retval,retval);
I feel my issue is something to do with this. What I want to understand is how to open a UDP socket and send data to a server on specified ip/port.
Any help is much appreciated !