[参考译文] MSP432E401Y：PHY 链路层事件

尊敬的 Mike：

 请参阅 EMACMSP432E4_processPhyInterrupt 函数。 可以使用此函数来检测链路状态。 此函数位于 C：\ti\simplelink_msp432e4_sdk_4_20_00_12\source\ti\drivers\emac\EMACMSP432e4.c 中。  

/*
 *  ======== EMACMSP432E4_processPhyInterrupt ========
 */
static void EMACMSP432E4_processPhyInterrupt()
{
    uint16_t value;
    uint16_t status;
    uint32_t config;
    uint32_t mode;
    uint32_t rxMaxFrameSize;

    /*
     * Read the PHY interrupt status.  This clears all interrupt sources.
     * Note that we are only enabling sources in EPHY_MISR1 so we don't
     * read EPHY_MISR2.
     */
    value = EMACPHYRead(EMAC0_BASE, PHY_PHYS_ADDR, EPHY_MISR1);

    /* Read the current PHY status. */
    status = EMACPHYRead(EMAC0_BASE, PHY_PHYS_ADDR, EPHY_STS);

    /* Has the link status changed? */
    if (value & EPHY_MISR1_LINKSTAT) {
        /* Is link up or down now? */
        if (status & EPHY_STS_LINK) {
            EMACMSP432E4_private.linkUp = true;
        }
        else {
            EMACMSP432E4_private.linkUp = false;
        }
        /* Signal the stack for this link status change (from ISR) */
        signalLinkChange(EMACMSP432E4_private.hEvent,
                EMACMSP432E4_private.linkUp, 1);
    }

    /* Has the speed or duplex status changed? */
    if (value & (EPHY_MISR1_SPEED | EPHY_MISR1_DUPLEXM | EPHY_MISR1_ANC)) {
        /* Get the current MAC configuration. */
        EMACConfigGet(EMAC0_BASE, (uint32_t *)&config, (uint32_t *)&mode,
                        (uint32_t *)&rxMaxFrameSize);

        /* What speed is the interface running at now? */
        if (status & EPHY_STS_SPEED) {
            /* 10Mbps is selected */
            config &= ~EMAC_CONFIG_100MBPS;
        }
        else {
            /* 100Mbps is selected */
            config |= EMAC_CONFIG_100MBPS;
        }

        /* Are we in full- or half-duplex mode? */
        if (status & EPHY_STS_DUPLEX) {
            /* Full duplex. */
            config |= EMAC_CONFIG_FULL_DUPLEX;
        }
        else {
            /* Half duplex. */
            config &= ~EMAC_CONFIG_FULL_DUPLEX;
        }

        /* Reconfigure the MAC */
        EMACConfigSet(EMAC0_BASE, config, mode, rxMaxFrameSize);
    }
}