AM3358: PRU Ethernet firmware

Hi akbar,

Can you please check if the following the e2e threads help:

e2e.ti.com/.../2388305

Regards,

Garrett

Hi Garrett,
I read it but it didn't help me.

I tried even this scenario to receive data sent from PC to MII RX1 in PRU0, BUT with no success:

    /* Clear SYSCFG[STANDBY_INIT] to enable OCP master port */
    CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;

    //set ocp_clk source 200 MHz
    CT_CFG.IEPCLK_bit.OCP_EN = 1;

    // selected configuration (such as MII_RT, Parallel Capture,Shift Out, and direct connection)
    CT_CFG.GPCFG0_bit.PRU0_GPI_MODE = 0b11;

    // set TX_CLK_DELAY to 6h
    CT_MII_RT.TXCFG1_bit.TX_CLK_DELAY1 = 0x6;

    CT_MII_RT.TXCFG1_bit.TX_START_DELAY1 = 0x40;

    //PRU Internal Pinmuxing
    CT_CFG.PIN_MX_bit.PIN_MUX_SEL = 0;

    // select TX source pru0 or pru1
    CT_MII_RT.TXCFG1_bit.TX_MUX_SEL1 = 0; //TX1 data from PRU0
    CT_MII_RT.TXCFG1_bit.TX_AUTO_PREAMBLE1 = 1;
    CT_MII_RT.TXCFG1_bit.TX_ENABLE1 = 1;

    CT_MII_RT.RXCFG1_bit.RX_MUX_SEL1 =  0;  // Receive data from MII RX1 to PRU0
    CT_MII_RT.RXCFG1_bit.RX_ENABLE1 =   1;  // Enables the receive traffic selected by RX_MUX_SELECT

    while(1)
    {
        for (i=0; i<50; i++)//receive the pack start - 32 byte
        {
            rx_data = __R31; //read the data and status
            CT_SHARED_MEM.mem[i] = rx_data;
            __delay_cycles(40000);
            __R31 = (1<<17);//rx_pop16
            __delay_cycles(40000);
        }
    }
    __halt();

I generate ping request in my PC and send it. Reading  CT_SHARED_MEM.mem[i] shows 0x20000 i.e recieved data is ZERO (I think no data is received at all)

Here is my PHY (DP83822) configuration:

    /* Initialize MDIO */
    MDIOInit(PRU_MDIO_REGS_BASE, MDIO_FREQ_INPUT, MDIO_FREQ_OUTPUT);

    //Restart Auto negotiation
    PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMCR_INDEX, &bmcr);
    bmcr |= AUTO_NEGOTIATION_RESTART;
    PhyRegWrite(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMCR_INDEX, bmcr);


    /* Double Check Parameters */
    //Wait until Auto negotiate complete
    PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMSR_INDEX, &bmsr);

    while((bmsr & AUTO_NEGOTIATION_COMPLETE_MASK) == AUTO_NEGOTIATION_NOT_COMPLETE) {
        PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMSR_INDEX, &bmsr);
    }

    //wait until link be established
    while((bmsr & LINK_STATUS_MASK) == LINK_NOT_ESTABLISHED)
    {
        PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMCR_INDEX, &bmsr);
    }

    //Check Speed
    PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMCR_INDEX, &bmcr);

    if((bmcr & SPEED_SELECTION_MASK) == SPEED_10M)
    {
        speed = 10;
    }
    else {
        speed = 100;
    }

    //Check Duplex
    if((bmcr & SPEED_SELECTION_MASK) == DUPLEX_HALF)
    {
        duplex = 0;
    }
    else {
        duplex = 1;
    }

    __delay_cycles(40000);
    __delay_cycles(40000);
    __delay_cycles(40000);
    

    //Check MII mode
    PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_RCSR_INDEX, &rcsr);
    if ((rcsr & RMII_MODE_MASK) == MII_ENABLED)
    {
        mii = 1;
    }
    else
    {
        mii = 0;
    }

    //Check link status
    PhyRegRead(PRU_MDIO_REGS_BASE, PRU_PHY, PHY_BMSR_INDEX, &bmsr);
    if((bmsr & LINK_STATUS_MASK) == LINK_DOWN)
    {
        isup = 0;
    }
    else
    {
        isup = 1;
    }

Now PHY is Operating at 100Mbps FullDuplex MII mode and Link is established.


Q1- Do My previous codes for sending and this one for receiving seem OK?? or it has some problem?
I want to make sure that the code is correct and there might be a problem somewhere else e.g. hardware or circuit...

Thanks for your help

Hi akbar,

I don't see obvious error in Tx and Rx configuration above. You may try to dump the registers to see if it's programmed as expected. Also the Auto forward configuration in the Table 2. MII_RT Configurations of the app note may help: 

>>What are the minimum MII Registers configurations for auto forwarding MII RX1 data to MII TX1

You need enable bit 9 TX_AUTO_SEQUENCE in TXCFG register.

Regards,
Garrett

In case any hardware issue, you may test your code on AMIC110 ICE board, which is a variant of AM335x with Cortex-A8 and uses DP83822 PHY as well:

Regards,

Garrett