Linux: overrun message appears during serial communication, the serial received data is lost.

yuri exi

Intellectual 865 points

Tool/software: Linux

Hello All

My board is am335x-evm, SDK is sdk-02.00.00.11.

I have one problem.

If an overrun message appears during serial communication, the serial received data is lost.

host is PC, device is printer.

Under general circumstances, there seems to be no problem

When transfer data amount is large and busy signal is generated, overrun occurs and data seems to be corrupted...

In order to frequently cause this problem, the serial data is slowly read from the device equipment,
busy situations often occur.

I used 8250 serial driver.

I disable DMA function in 8250 driver.

thank you your reply.

over 8 years ago

0 Kemal R. Shakir over 8 years ago

TI__Guru 55345 points

The UART expert has been notified. He will respond here.

0 Michael Erdahl over 8 years ago

TI__Genius 13515 points

Hi Tosky,

Disabling the overrun function will probably not help- that message is saying the UART input FIFO is not being read quickly enough (in other words, suppressing this message would mean you'd lose data without knowing it).

What baud rate is the serial port set at? What does the CPU loading look like when this occurs?

Regards,
Mike

Processors

Processors forum

Linux: overrun message appears during serial communication, the serial received data is lost.