I’m with a problem with W5100. The SPI comunication works ok in a develop board (WIZ812MJ) the socket open normally. But in my custom board (schematic attached), the socket not open, after send a open socket command, the S0_SR every returns “0”. I tried with socket 0, 1 and 2 and give a same result.
The same code application works with WIZ812MJ.
The protocol is the TCP/IP.