W5100 SPI Mode Problem

Question

Hi there, I am trying to configure an Arduino Ethernet Shield on top of an Arm Musca-B1 board. As of now, I have the SPI library working as well as the ioLibrary. My code looks like this: reg_wizchip_cs_cbfunc(cs_sel, cs_desel); reg_wizchip_spi_cbfunc(spi_rb, spi_wb); wizchip_init(bufSize, bufSize); wiz_NetInfo netInfo = { .mac = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }, // Mac address .ip = { 192, 168, 1, 192 }, // IP address .sn = { 255, 255, 255, 0 }, // Subnet mask .gw = { 192, 168, 1, 1 } }; // Gateway address wizchip_setnetinfo( & netInfo); wizchip_getnetinfo( & netInfo); reconnect: /* Open socket 0 as TCP_SOCKET with port 5000 */ if ((retVal = socket(0, Sn_MR_TCP, 5000, 0)) == 0) { /* Put socket in LISTEN mode. This means we are creating a TCP server */ if ((retVal = listen(0)) == SOCK_OK) { /* While socket is in LISTEN mode we wait for a remote connection */ while (sockStatus = getSn_SR(0) == SOCK_LISTEN) for (int i = 0; i < 1000; i++); /* OK. Got a remote peer. Let's send a message to it */ while (1) { /* If connection is ESTABLISHED with remote peer */ if (sockStatus = getSn_SR(0) == SOCK_ESTABLISHED) { uint8_t remoteIP[4]; uint16_t remotePort; /* Retrieving remote peer IP and port number */ getsockopt(0, SO_DESTIP, remoteIP); getsockopt(0, SO_DESTPORT, (uint8_t * ) & remotePort); sprintf(msg, CONN_ESTABLISHED_MSG, remoteIP[0], remoteIP[1], remoteIP[2], remoteIP[3], remotePort); //PRINT_STR(msg); /* Let's send a welcome message and closing socket */ if (retVal = send(0, GREETING_MSG, strlen(GREETING_MSG)) == (int16_t) strlen(GREETING_MSG)) {} //PRINT_STR(SENT_MESSAGE_MSG); else { /* Ops: something went wrong during data transfer */ sprintf(msg, WRONG_RETVAL_MSG, retVal); } break; } else { /* Something went wrong with remote peer, maybe the connection was closed unexpectedly */ sprintf(msg, WRONG_STATUS_MSG, sockStatus); break; } } } else /* Ops: socket not in LISTEN mode. Something went wrong */ {} } else { /* Can't open the socket. This means something is wrong with W5100 configuration: maybe SPI issue? */ sprintf(msg, WRONG_RETVAL_MSG, retVal); } /* We close the socket and start a connection again */ disconnect(0); close(0); goto reconnect; I am able to set the network information and ping the board with the IP and MAC chosen. Nevertheless, when I try to telnet the device I have no output at all. It keeps trying to connect without success. While debugging I notice that I can’t put the socket to listen, which is maybe related with the SPI communication. I will left some pictures of a SPI sniffer so you can check if there’s any problem with the communication (which I think there is, since on read operations the CS is going high before any byte being write on MISO. image1166×352 34.2 KB

Daniel Oliveira · Answer

Another example of the SPI communication ouput. Read frames are missing a byte and some operations are receiving wrong values. image1872×539 114 KB

Daniel Oliveira · Answer

Hi again, I solved this issue by forcing a read byte for each write byte. Thanks.