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Altera_Forum's avatar
Altera_Forum
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21 years ago

lan91c111 quiestion

I use standalone single threaded lwIP realization. And I have found that initialization procedure for lan91c111 doesn't pass if I didn't insert active network cable to it. So all program execution stops untill cable is inserted. This is wery bad for single threaded application, cuase I need program to do another job without waiting cable insertion, and lan is used from time to time to get some statistics.

Does someone knows How can I bypass this trouble?

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    If ethernet cable not pluged than function "int alt_avalon_lan91c111_init(alt_avalon_lan91c111_if *dev)", from lan91C111 HAL library, return NON ZERO code.

    Call graph:

    1. netif_add()

    2. lan91c111if_init()

    3. low_level_init()

    4. atl_avalon_lan91c111_init()

    5. configure_phy()

    Initialisayion of LAN91C111 device failed by time-out in configure_phy(dev) function at this code: 

      /* Start the Auto Negotiation process */
  /* Try to negotiate, we have a go at this five times if it fails */
  i = 5;
  do 
  {
    write_phy_register( dev, 
                        ALTERA_AVALON_LAN91C111_PHY_CONTROL_REG, 
                        ALTERA_AVALON_LAN91C111_PHY_CONTROL_ANEG_EN_MSK | 
                        ALTERA_AVALON_LAN91C111_PHY_CONTROL_ANEG_RST_MSK);
    /* This may take a few seconds */
    timeout = 20;
    do 
    {
      value = read_phy_register(dev, ALTERA_AVALON_LAN91C111_PHY_STATUS_REG);
      timeout --;
      usleep(500000);
    }while (!(value & ALTERA_AVALON_LAN91C111_PHY_STATUS_ANEG_ACK_MSK)  
              && (timeout > 0));
    i --;
  }
  while( (i != 0) && (timeout == 0));
  if (timeout == 0)
  {
    ret_code = -EIO;
    goto exit;
  }

    5. configure_phy(): ret_code = -EIO;

    4. alt_avalon_lan91c111_init(): ret_code = -EIO;

    3. low_level_init(): return (err_t)ERR_IF;

    2. lan91c111if_init(): return (err_t)ERR_IF;

    1. netif_add(): return NULL

    For avoid program HALT you may check netif_add return code and if it is NULL try recall netif_add function.