Kevin Braun / k64f_EthLink

Ethernet link status for the K64F

Dependents:   JRO_CR2 K64F_EthLink_HelloWorld frdm_test JRO_DDSv2

Simple K64F technique to determine if the Ethernet PHY link is up or down. The routine utilizes the Ethernet MII interface to gain access to the Ethernet PHY which contains the actual link status.

I wrote this because the mbed Ethernet function does not recognize its own "int link();" function with the K64F.

k64f_EthLink.cpp

Committer:
loopsva
Date:
2014-11-07
Revision:
3:fbd2336e1193
Parent:
2:59166b94dfd0
Child:
4:9d2a4dc03170

File content as of revision 3:fbd2336e1193:

#if defined(TARGET_K64F)
#include "k64f_EthLink.h"

//--------------------------------------------------------------------------------------------------------------------------------------//
// Constructor

k64fEthLink::k64fEthLink() {
}

//--------------------------------------------------------------------------------------------------------------------------------------//
// Get Ethernet link status on the K64F

int k64fEthLink::GetELink() {
    int mdio_timer = 0;
    uint32_t k64f_mdio_reg = ENET_EIR;
    
    //wait for MDIO interface to be ready
    do {
        k64f_mdio_reg = ENET_EIR;
#ifdef RTOS_H
        Thread::wait(1);
#else   
        wait_ms(1);
#endif
        mdio_timer++;
    } while(((k64f_mdio_reg & MDIO_MII_READY_BIT) == 0) && (mdio_timer < 300));
    if(mdio_timer > 298) {          //average is about 122mS
        return(MDIO_TIMEOUT);       //timeout error
    }   
    
    //get Basic Status Register
    ENET_MMFR = MDIO_GET_LINK_REG;
    wait_us(35);                    //20 is absolute minimum!!
    k64f_mdio_reg = ENET_MMFR;      //get the phy result
    if(k64f_mdio_reg & MDIO_MII_LINK_BITS) return(PHY_UP);
    return(PHY_DOWN);
}
#endif