Problem writing in the Sn_DIPR registers

Question

hi, I’m trying to connect as a client to a server with W5200. I use a Ethernet Shield V2.0 from seeedstudio.com and the chip version that i can read in 0x001F register is 0x03. I can initialize W5200 successfully (with a private ip address and i can ping from my pc to W5200 successfully), and I can open the socket properly and then the socket is in the INIT state. Then, when I try to write the server’s address in the SnDIPR register, the W5200 does not agree, and when I read these registers to verify that the server ip is entered correctly, tells me that the IP is 0.0.0.0 I am quite sure that the registers are written correctly through SPI. and i don´t know why when I read them again the W5200 responds with 0 the same is true with the Sn_DPORT register What’s the matter? thank

hjjeon0608 · Answer

Hi, jbc. Try one more after connection established. DIPR and DPORT register value are not changed immediately. They are changed after connection established. Best regards.

jbc · Answer

thank you very much for the reply. I solved the problem. I did two things: 1.- write the DIPR and DPORT registers before opening the socket (I’ve read in another post). 2.- read those registers for verificartion after conexion stablished. I think this information should be updated in the datasheet for futures issues. regards