I am facing a tx underrun error in lpc1768 emac driver

[ankish_sharma1]

I am using lpc port for lwip2.0.1 and facing a random delay in transmission .Debugging the emac driver gives me a tx underrun bit set in the TSV0 register every time a delay occurs.Had someone experienced the same issue and is there some reliable fix for this.

Thanks

[ankish_sharma1]

Hi

I am getting the overrun status on my debugger window have attached the debugging window snapshot

so I think below is the reason for a underrun out of three reasons

The transmission fragment data is not available when the Ethernet block has already

started sending the frame. This is a nonfatal error. An Underrun status will be returned

on transfer and the TxError bit in IntStatus will be set.

But I don’t know how to resolve this issue

I increased the tx descriptors to 6 from 4 but it didn’t helped

Mit freundlichen Grüßen

Best regards

Ankish Sharma

Software Development

Helmholz GmbH & Co. KG

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[jeremyzhou]

Hi Hi ankish sharma,

Thanks for your reply.
To provide the fastest possible support, I'd highly recommend you to refer to the Lwip demo in the LPCOpen library, use the demo as a template.

Please give a try.

LPCOpen Software for LPC17XX | NXP

Have a great day,
TIC

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