i.MX UART hardware misbehaves on baudrate mismatch

[george]

Dear all,

Now, we have a issue in the product using i.MX6SX.

I searched it in this community, and I found any same issues as follows:

i.MX6 infinite loop in uart driver(rx interrupt) 

i.MX6 UART hardware misbehaves on baudrate mismatch 

It is an issue to continue receiving 0xFF as well as these reports, although there is no data reception.

As shown in the following figure, general UART communication has Start bit and Stop bit.

When receiving continuous data, can't the UART block for i.MX detect Start-bit and Stop-bit?

Best Regards,

George

[george]

Hi FabioEstevam‌,

Yes, two virtual COM ports are connected to my Linux PC with the USB cable.

Best Regards,

George

[Yuri]

Hello,

  It is mentioned in https://community.nxp.com/thread/441193 , that this is 

(hardware) feature of the i.MX UART module (if short start bit appears because
of noisy environment). 

Have a great day,
Yuri

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[george]

Dear Yuri‌,

That is, does it mean that the product using i.MX series has the "0xFF infinite reception" risk?

When we do not wish to do so, please tell me how to prevent it.

BR,

George

[Yuri]

Hello,

  it is needed to avoid situations, when short (non-proper) start bit appears.

In particular, it may occur if disconnecting cable during transfer.   

Regards,

Yuri.