Howto read the ethernet link speed on C6655

Jens Biltoft

I need some help in reading the link speed on the ethernet connection on my custom C6655 board.

I have connected my custom board to my PC, and the PC detects that the connection is 1Gb/s, and I can send data to and from my DSP - so I know the connection is there. My problem is that I need to know the link status on the DSP, because in the final application there will be no PC.

I have tried using the emac_poll() function like this

static void UpdateLink(int *link_status)
{
  EMAC_LINK_INFO_T link_info;

  if (emac_poll(0, &link_info) == EMAC_DRV_RESULT_OK)
  {
    *link_status = link_info.link_status;
  }
}

But it allways returns 0 in link_info.link_status - even though I can see on the PC that the link is 1Gb/s

My application is using

ndk_2_24_00_11

bios_6_41_00_26

pdk_C6657_1_1_2_6

When the network is opened I get the following output in the emulator

[C66xx_0] emac_init: core 0, port 0, total number of channels/MAC addresses: 1/1
MAC addresses configured for channel 0:
C4-ED-BA-9E-F6-BE
SGMII reset successful........
SGMII config successful........
emac_open core 0 port 0 successfully
Registration of the EMAC Successful, waiting for link up ..
Network Added: If-1:192.168.0.189
Service Status: Telnet : Enabled : : 000
Service Status: HTTP : Enabled : : 000

It should be noted that our custom board does not use the same PHY as the EVM, instead it uses the MARVELL Alaska 88E1512, but I do not know if that makes any difference.

Thanks

Jens

over 9 years ago

0 Titusrathinaraj Stalin over 9 years ago

TI__Guru** 116100 points

Hi Jens,
Please refer to the following C6655's EMAC user guide.
www.ti.com/.../spruhh1.pdf

Refer to the chapter 7.6, MR_ADV_ABILITY register to know about the duplexity.

0 Jens Biltoft over 9 years ago in reply to Titusrathinaraj Stalin

Expert 1220 points

Thanks TS

I can see that this could work, but I was hoping that there was a function in the PDK or NDK that could provide me with the information.

I have chosen to use the information from the PHY which I can extract using MDIO like this

void get_phy_status (Uint16* status)
{
  SET_PHYPAGE(0);
  *status = readPhyReg(APP_PORT0_PHY_ADDR, 17);
}

typedef struct
{
  Uint16 Jabber:1;    
  Uint16 Polarity:1;    
  Uint16 DTEPowerStatus:1;
  Uint16 GlobalLinkStatus:1;
  Uint16 CopperEnergyDetectStatus:1;
  Uint16 DownshiftStatus:1;
  Uint16 MDICrossoverStatus:1;
  Uint16 Reserved:1;
  Uint16 ReceivePauseEnabled:1;
  Uint16 TransmitPauseEnabled:1;
  Uint16 CopperLink:1;
  Uint16 SpeedAndDuplexResolved:1;
  Uint16 PageReceived:1;
  Uint16 Duplex:1;
  Uint16 Speed:2;
} S_COPPER_SPECIFIC_STATUS_REGISTER1;

typedef enum
{
  E_No_Link,
  E_10Mbs_Half_Duplex,
  E_10Mbs_Full_Duplex,
  E_100Mbs_Half_Duplex,
  E_100Mbs_Full_Duplex,
  E_1000Mbs_Full_Duplex
} LinkState;

static void UpdateLink(void)
{
    S_COPPER_SPECIFIC_STATUS_REGISTER1 status;
    EMAC_LINK_INFO_T        link_info;

/* does not work 
    if (emac_poll(0, &link_info) == EMAC_DRV_RESULT_OK)
    {
      *_stEthernetTest.link_status = link_info.link_status;
    }
*/
    get_phy_status ((Uint16*)&status);
    if(status.SpeedAndDuplexResolved == 1)
    {
      switch(status.Speed)
      {
        case 2: /*1000Mbps*/
          *_stEthernetTest.link_status = E_1000Mbs_Full_Duplex; 
          break;
        case 1: /*100Mbps*/
          *_stEthernetTest.link_status = E_100Mbs_Half_Duplex + status.Duplex; 
          break;
        case 0: /*10Mbps*/
          *_stEthernetTest.link_status = E_10Mbs_Half_Duplex + status.Duplex;
          break;
        default:  
          *_stEthernetTest.link_status = E_No_Link;
      }
    }
    else
    {
      *_stEthernetTest.link_status = E_No_Link;
    }

}

I am not sure this is the most optimal way, but it will have to do for now

best

Jens

void get_phy_status (Uint16* status){ SET_PHYPAGE(0); *status = readPhyReg(APP_PORT0_PHY_ADDR, 17);}

0 Titusrathinaraj Stalin over 9 years ago in reply to Jens Biltoft

TI__Guru** 116100 points

Thanks for your update.

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Howto read the ethernet link speed on C6655