Linux/AM3358: byte swapped randomly when transmitting data over RS485

sean chen72

Prodigy 20 points

Part Number: AM3358

Tool/software: Linux

Dear,

I have a beaglebone board which has one of its UART used for RS485 communication.

I'm using the below Linux from yocto release and configuring it to use omap_serial driver.

Linux beaglebone 4.1.6-yocto-standard #8 PREEMPT Wed Jan 11 14:34:20 AEDT 2017 armv7l GNU/Linux

When I send a file to this UART, I can find on the other end some neighbouring bytes were swapped. This happens in random places and only for baud rate >=9600.

Have you ever seen this issue and what could be the cause?

Thank you for help.

Best Regards,
Sean

over 9 years ago

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,

I haven't seen such issue reported.. Can you try the same test with the official TI release (kernel 4.4):
www.ti.com/.../PROCESSOR-SDK-AM335X

Best Regards,
Yordan

0 sean chen72 over 9 years ago in reply to Yordan Kovachev

Prodigy 20 points

Hi Yordan,

Thank you for your reply. My issue turn out to be a problem of the windows driver of a usbrs485 converter used to receive data.

Previously I tested the communication between two such converters without any problem which made me think the issue was on the beaglebone side.

But later when using such a converter connected to Linux PC as receiving end, I found no problem.

Best Regards,
Sean

0 Yordan Kovachev over 9 years ago in reply to sean chen72

TI__Guru**** 161600 points

Hi Sean,

Thanks for sharing the solution of your problem.

Best Regards,
Yordan

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Linux/AM3358: byte swapped randomly when transmitting data over RS485