Ethernet Cable Status - TWR-SER2 board

[priyagupta]

I'm trying to detect the status of the network cable (plugged, un-plugged) on a TWR-SER2 board connected with TWR-K60F120M using MQX 4.2.

 I am using the RTCS function - "ipcfg_get_link_active()" but it seems to always return a 'TRUE' once the Ethernet system is configured. Prior to configuring the Ethernet it reports a 'FALSE'.

Once the Ethernet system is configured and operational, plugging or un-plugging the Ethernet cable from the TWR-SER2 module seems to make no difference, the function always returns a 'TRUE'. 

Code Snippet:

#define BSP_DEFAULT_ENET_DEVICE   0

error = RTCS_create();
if(error == RTCS_OK)
{
   /* Initialise Ethernet */
   error = ipcfg_init_device(BSP_DEFAULT_ENET_DEVICE, mac_address);
   if (error != IPCFG_OK)
   {
      printf("Fatal Error 0x%X: Network device initialisation failed.\n", error);
      _task_block();
   }
while(retVal == FALSE)
{
   retVal = ipcfg_get_link_active(BSP_DEFAULT_ENET_DEVICE);
   if(retVal == TRUE)
      printf("\nCable Connected..!!");
   else
        printf("\nCable not connected..!!");
   _time_delay(100);
} 

-- It comes out of while loop at once.

Also, i tried to read the data value in phy_dp83xxx_get_link_status() function; it always returns 0x7FFF, no matter whether the cable is connected or not connected.

static bool phy_dp83xxx_get_link_status
(
ENET_CONTEXT_STRUCT_PTR enet_ptr
)
{
uint32_t data;
bool res = FALSE;

/* Some PHY (e.g.DP8340) returns "unconnected" and than "connected" state
* just to show that was transition event from one state to another.
* As we need only curent state, read 2 times and return
* the current/latest state. */
if ((*enet_ptr->PARAM_PTR->ENET_IF->MAC_IF->PHY_READ)(enet_ptr, DP83XXX_REG_BMSR, &data, MII_TIMEOUT)) {
if ((*enet_ptr->PARAM_PTR->ENET_IF->MAC_IF->PHY_READ)(enet_ptr, DP83XXX_REG_BMSR, &data, MII_TIMEOUT))
{
printf("\nData: %lx", data);
res = ((data & DP83XXX_REG_BMSR_LINK_STATUS) != 0) ? TRUE : FALSE;
}
}
return res;
}

[priyagupta]

Can anyone please provide inputs for resolving the above stated issue? 

[mjbcswitzerland]

Hi

It sounds as though the PHY may not be responding. Try reading its ID registers (and match with the expected values) to ensure that reads are basically operating.

Regards

Mark