Can't get Wiz5500 to communicate with pc via Ethernet

Question

Good evening, I have laid out a pcb with an W5500 and an Atmega256RFR2, the W5500 implementation is straight from the example using the jack with magnetics for a smaller footprint, after some initial problems with the SPI config I can talk with the chip via SPI and do the init routine, but whatever I do/change in code I can’t get it so send back even one single packet back(I have been monitorizing the ethernet with Wireshark). I have already tried a couple “libs” that build on top of Wiznet own lib/driver, but none gets me anywhere. My printf inside TCP_Server always returns 0x14 and nothing else, reading back the NetConf values from the chip with TCP_Server running in the main loop I get this: === NET CONF : STATIC === ====== HW ID : 4 ====== MAC : 00:14:A3:72:17:3F IP : 192.168.1.2 GW : 192.168.1.1 SN : 255.255.255.0 ======================================= I really cant understand if this an hardware fail, or some software problem, I can probe the TX+/- and RX+/- lines that go to the mag jack, but with a 100Mhz scope I cant really “see” anything right or wrong with them, if I disconnect the cable I can see a series os pulses on TXN/TXP and nothing on RXP/RXN, expected, at least from my understanding. I will also attach a couple print-screens from my layout and schematic. About that, I swaped MISO and MOSI lines(dohh), already taken care of, and forgot the load caps on the 25Mhz crystal because I had an oscillator in there first, the caps where also added right next to the crystal and its indeed oscillating at 25Mhz. Using this code: [code]void TCP_Server(void){ int32_t ret; uint16_t size = 0, sentsize = 0; int16_t funcVal = 0; //uartPutsP(" TCP_Server "); // Get status of socket funcVal = getSn_SR(SOCK_ID_TCP); sprintf(gPtrintBuff, " getSn_SR(%i): %#02x ", SOCK_ID_TCP, funcVal); uartPuts(gPtrintBuff); switch(funcVal){ // Connection established case SOCK_ESTABLISHED :{ uartPutsP(" Scoket estabilished "); // Check interrupt: connection with peer is successful if(getSn_IR(SOCK_ID_TCP) & Sn_IR_CON){ // Clear corresponding bit setSn_IR(SOCK_ID_TCP,Sn_IR_CON); } // Get received data size if((size = getSn_RX_RSR(SOCK_ID_TCP)) > 0){ // Cut data to size of data buffer if(size > DATA_BUF_SIZE){ size = DATA_BUF_SIZE; } // Get received data ret = recv(SOCK_ID_TCP, gDATABUF, size); // Check for error if(ret <= 0){ return; } // Send echo to remote sentsize = 0; while(size != sentsize){ ret = send(SOCK_ID_TCP, gDATABUF + sentsize, size - sentsize); // Check if remote close socket if(ret < 0){ close(SOCK_ID_TCP); return; } // Update number of sent bytes sentsize += ret; } } break; } // Socket received the disconnect-request (FIN packet) from the connected peer case SOCK_CLOSE_WAIT :{ // Disconnect socket if((ret = disconnect(SOCK_ID_TCP)) != SOCK_OK){ return; } break; } // Socket is opened with TCP mode case SOCK_INIT :{ uartPutsP("SOCK_INIT "); // Listen to connection request if( (ret = listen(SOCK_ID_TCP)) != SOCK_OK){ return; } break; } // Socket…

Eugeny · Answer

senso: Forgot to say that when I connect the ethernet cable ipconfig says that the IP is 169.254.68.247 and the subnet mask is 255.255.0.0 in case this extra info might help. It seems you are trying direct connect? What is network topology? I assume you talk about your PC on the network because 169.254 is IP address auto-assign feature of Microsoft Windows when it can not find DHCP server. And of course, with this address you will not see anything on the network using Wireshark installed on this PC. You have to ensure this PC is “included” into the network receiving proper IP address (e.g. 192.168.1.3) from gateway/DHCP server configured pool. As soon as both devices - W5500 and your PC are on the same network, only then you may be able to see some communication (except if you send broadcast UDP packets). Also, W5500 should have valid gateway listed in its gateway register, because W5500 relies on the gateway to perform specific actions (in particular perform ARP process).

senso · Answer

Thanks for your response, so, I can’t just connect the Wiz directly to my pc for debug/code development? I need to connect it into a switch(not that is a problem, just curious/want to know). I dont understand a lot about network(ing), as you might already noted, and I have spent days around this little critter(in a good way), what would be a valid gateway value for W5500? EDIT: Connected the board into the switch, Wireshark up and running, there is no packet from the W5500 MAC adress, I have also tried changing the GW into the GW that the network assigns to my laptop(192.168.32.3), going by the TCP_Server state machine, I’m still stuck getting 0x14 from this line: funcVal = getSn_SR(SOCK_ID_TCP); And so the only thing that happens is that is says sock init(from the SOCK_INIT state) and nothing else happens. I cant be sure if this is an hardware or software problem right now I have already checked all the footprints a dozen times. EDIT2: It was indeed a problem with IP/gateway! It finally works! So happy that I can ping the board. Thanks again for your insight. Best regards.

Eugeny · Answer

Apologies for very late reply. If problem is still actual go ahead.