Ethernet Interrupts never occur in a custom board of TM4C1294

Hi Amit,

The new custom board is designed based on TM4C1294 but different usages of GPIO ports. However, Ethernet(EN0TX,RX...) is not configured by any gpio ports, so it should not be a matter I believe.

I just tested enet_lwip for both EK and custom board, and the example did not work on the custom board. Like I said, the communication codes in my project work well in EK board just like enet_lwip.

If the problems come from hardware, how can I verify where the problems are from? since the components associated with Ethernet is so tiny. It is even hard to use scope.

thanks,
Jin

Hi Amit,

I am not the office until Tuesday next week, so as I get back I will response.

Thanks,

Jin

Hi Amit,

I was given only a paper schematic, but it is identical with Ethernet schematic of TM4C

When it comes to bus, the custom board is built as a PCB just like TM4C populated by TI, so I am not sure how you guys check buses if they work well or not if the lines and components are so tiny. Also the custom board does not have breadboard connection header.

As I tested  the program that I work on TM4C, lwIPInterruptTask() and lwIPEthernetIntHandler() were called alternately in order to enable/disable Ethernet interrupt, but those two functions were not called on the custom board.

If none of Ethernet frames is detected by the custom board, so no interrupt happens right?

Thanks,

Jin

Hi Amit,

Here is the schematic, and the schematic will be deleted as you read.

Thanks,

Jin

Hi Amit,

I tried to measure the frequency of oscillator, but the chip is so tidy, and it is already mounted on the custom pcb.

Even with TM4C board I am not sure how I can measure the frequency of OSC(Y1 below) directly?

Thanks,

Jin

Hi Amit,

I measured the frequency at PORT A/Pin 5, and gave me a same rate.

 while(1)
    {
        //
        // Turn on D1.
        //
        LEDWrite(CLP_D1, 1);
        GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, 0x00);
        //
        // Delay for a bit.
        //
        SysCtlDelay(g_ui32SysClock / 10 / 3);

        //
        // Turn off D1.
        //
        LEDWrite(CLP_D1, 0);
        GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, GPIO_PIN_5);
        //
        // Delay for a bit.
        //
        SysCtlDelay(g_ui32SysClock / 10 / 3);
    }

It seems 25Mhz Xtal works well although Y2 values are wrong.

Thanks,

Jin

Hi Amit,

The custom board was populated already, so I will ask to have LEDs for the later version of board.

However, the custom board connected to one of ports of a "Dell Switch" never blinks "port LED" on the switch unlike connecting with "EK-TM4C1294" Launchpad where "port LED" on the switch blinks as communicating between Server and Launchpad.

In lwIPLinkDetect(), the below code always gives "0" as testing the custom board.

bHaveLink = MAP_EMACPHYRead(EMAC0_BASE, 0, EPHY_BMSR) & EPHY_BMSR_LINKSTAT;

As a result, it always reaches to "return;" and never updates the Link status(initially g_bLinkActive =0) and executes further codes.

    if(bHaveLink == g_bLinkActive)
    {
        return;
    }

However, executing Launchpad returns 1 at 

MAP_EMACPHYRead(EMAC0_BASE, 0, EPHY_BMSR) & EPHY_BMSR_LINKSTAT

once, and execute further below codes of lwIPLinkDetect().

Thanks,

Jin

HI Amit,

I wonder about the wiring configuration of the diode array between a transformer and RJ45.

In TM4C1294XL user guide, Pin1/ 8 ,Pin2/7, Pin 3/6, and Pin4/5 are connected

However, the datasheet(SLVU2.8-4) provided by SEMTECH does not seem like same as the above one.

The custom board seems to not have the wiring connections in diode array shown on the TM4C user guide.

Is it not really a matter? both are fine?

Thanks

Jin