Hardware Initialization

Table of Contents

• Example configuration for Autonegotiation and a link status callback:
• Example configuration for 100MBit full duplex without link status callback:
• Example configuration using variable network_mode from netconfig.c:

DM2_EmacInit()

void *DM2_EmacInit (uint8_t mode, char *mac_addr_str, void (*link_status)(unsigned char));

resets and configures the Ethernet Controller to the network hardware interface: 10, 100M or 1Gbits/s, full or half duplex. You may also use auto-negotiation mode if your network hub supports this mode. Auto-Negotiation starts with 1G bit/s full-duplex and tries to establish a connection. If unsuccessful, the other modes are checked: 100M bits/s full-duplex, 100M bits/s half-duplex, 10 bits/s full duplex, and 10M bits/s half-duplex, until a matching mode is found.

Setting the MAC address by passing the mac_addr_str is available on DM2DM642, DM2C6747, VibPilot2, Unidaq and DM2C6657 only

The link_status() callback function is a user defined function for link status change events. If no link status messages are required, this parameter can be set to NULL.

Example configuration for Autonegotiation and a link status callback:

/*******************************************************************************

    @brief      link status change callback function
    @param      link mode: HDX_10, HDX_100, FDX_10, FDX_100
    @return     nothing

*******************************************************************************/
far void link_status (uint8_t mode)
{
    CPrintf ("\r\n Link status changed: ");

    switch (mode)
    {
        case 0xff:
            _link = 0;
            CPrintf ("No Link\r\n");
            break;

        default:
            _link = 1;
            CPrintf ("Linked at %dMbit %s duplex\r\n",
                    (mode & SPEED_100) ? 100:10,
                    (mode & FULL_DUPLEX) ? "full":"half");
            break;
    }
}

...
/*******************************************************************************
 initialize EMAC
*******************************************************************************/
if ( !DM2_EmacInit (AUTO_NEG, eth.mac, link_status) )
{
        prg_exit ("HW init function failed");        /* initialize EMAC error */
}

Example configuration for 100MBit full duplex without link status callback:

/*******************************************************************************
 initialize EMAC
*******************************************************************************/
if ( !DM2_EmacInit (FDX_100, eth.mac, NULL) )
{
        prg_exit ("HW init function failed");        /* initialize EMAC error */
}

Example configuration using variable network_mode from netconfig.c:

Refer to Device Specific Initialization file netconfig.c

/*******************************************************************************
initialize EMAC using variable from netconfig.c
*******************************************************************************/
if ( !DM2_EmacInit (eth.mode, eth.mac, link_status) )
{
        prg_exit ("HW init function failed");        /* initialize EMAC error */
}