WIZnet Developer Forum

W5100 SPI Mode Problem

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.

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

Yeah, you’re right.
There must be a problem with the SPI read function.
As you said, your MCU makes the CS line high before reading something.
Please look at the SPI read part again.

Thanks.

Hi again,

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

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