RM57L843: Questions for LwIP example

Koichiro Tashiro

Part Number: RM57L843

Hi,

My customer is evaluating LwIP demo code downloaded from below.
https://git.ti.com/cgit/hercules_examples/hercules_examples/tree/Application/LwIP?h=master

In the below file, line#13 and later;
\hercules_examples-master\Application\ActiveWebserver\1.1.0\utils\lwiplib.c

lwIPTimer(void)
{
    //
    // Increment the lwIP Ethernet timer.
    //
    EMACTxIntPulseDisable(EMAC_0_BASE, EMAC_CTRL_0_BASE, 0, 0);
    EMACRxIntPulseDisable(EMAC_0_BASE, EMAC_CTRL_0_BASE, 0, 0);
    g_ui32LocalTimer += 10;
    lwIPServiceTimers();
    EMACTxIntPulseEnable(EMAC_0_BASE, EMAC_CTRL_0_BASE, 0, 0);
    EMACRxIntPulseEnable(EMAC_0_BASE, EMAC_CTRL_0_BASE, 0, 0); }

What below four functions do and why they are needed?
EMACTxIntPulseDisable()
EMACRxIntPulseDisable()
EMACTxIntPulseEnable()
EMACRxIntPulseEnable()

Thanks and regards,
Koichiro Tashiro

over 4 years ago

0 QJ Wang over 4 years ago

TI__Guru**** 200976 points

HI Koichiro-san,

I am not an enternet person, and I don't know the answer at this moment. I will check for you.

0 Koichiro Tashiro over 4 years ago in reply to QJ Wang

TI__Mastermind 22945 points

Hi QJ,

Any updates for this item?
Customer is waiting for your feedback.

Thanks and regards,
Koichiro Tashiro

0 Koichiro Tashiro over 4 years ago in reply to Koichiro Tashiro

TI__Mastermind 22945 points

Hi QJ,

Could you answer this item?

Thanks and regards,
Koichiro Tashiro

0 QJ Wang over 4 years ago in reply to Koichiro Tashiro

TI__Guru**** 200976 points

Hi Koichiro-san,

The lwIPTimer() is only called in RTI interrupt service routine, and IRQ is used for RTI compare0 interrupt and EMAC interrupts in the example, It is not necessary to disable the EMAC interrupt in RTI notification because the IRQ is disabled while executing the RTI ISR.

0 Koichiro Tashiro over 4 years ago in reply to QJ Wang

TI__Mastermind 22945 points

Hi QJ,

I am not sure I understood your answer correctly.
Do you mean below functions disable EMAC interrupts?
EMACTxIntPulseDisable()
EMACRxIntPulseDisable()
EMACTxIntPulseEnable()
EMACRxIntPulseEnable()

And they are not necessary in fact as IRQ is already disabled in the RTI ISR.
So above four functions can be removed?

Thanks and regards,
Koichiro Tashiro

0 QJ Wang over 4 years ago in reply to Koichiro Tashiro

TI__Guru**** 200976 points

Hi Koichiro-san,

Those 4 functions are to disable and enable the EMAC TXPULSE and RXPULSE Interrupts Generation. If lwIPTimer() is called in an IRQ ISR, those 4 functions call are not required.

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RM57L843: Questions for LwIP example