UART i.MX6 9-bit mode. Receiver discard all characters until get a 9-bit on frame

[joseluiszabalz1]

Hello

I am playing with i.MX6 9-Bit UART mode implementing a new device driver.

When I read the Reference Manual I thought I was in a mistake but now I have verified that is true.

The UART receiver discard all characters until it receive a frame with 9-bit on.

Can someone corroborate this behavior?

Is it possible change this behavior?

Does i.MX8 UART soc have the same behavior ? The reference manual is identical.

Thanks in advance.

[igorpadykov]

Hi Jose

similar behaviour is described in sect.64.7.3.1 RS-485 Slave Address Normal

Detect Mode i.MX6DQ Reference Manual :

"The receiver ignores all data frames (9th bit = 0) until an address frame is received (9th bit = 1)."

http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

>Does i.MX8 UART soc have the same behavior ? The reference manual is identical.

yes if reference manual is identical, in particular i.MX8MQ has the same UART module as i.MX6Q.

Best regards
igor
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[joseluiszabalz1]

Thanks Igor, but is It possible change this behavior and get frames before the first 9-bit=1 frame arrive?

Best regards.

[igorpadykov · Accepted solution]

Hi Jose

I am afraid it is not possible to change behaviour described in Reference Manual.

Best regards
igor