Question, i.MX35 UART / watching DSR

[Aemj]

Hi team,

I would like to ask about UART functionality of i.MX35.

My customer is developing their own i.MX35 board.

And they want to use UART as full RS232C communication.

They want to know how to watch DSR level.

The reference manual of i.MX35 says that the transition of DSR signal can be seen by interrupt in DTE mode.

But they want to know how one can watch the current Hi/Low level of DSR input signal.

Are there any ways to watch the current level of DSR, like reading some kind of register?

Thanks,

Miyamoto

[b36401]

You can refer Chapter 47 "Universal Asynchronous Receiver/Transmitter (UART)"

of i.MX35 (MCIMX35) Multimedia Applications Processor Reference Manual for the details.

Have a great day,

Victor

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[Aemj]

Hi Victor,

After reading chapter47 of i.MX35, the customer thinks there is no register that indicate the status(high/low) of DSR. i.MX35 only has a scheme to watch the transition of DSR state. i.MX35 only has a mechanism to watch the transition of DSR state.

I think if one needs to watch the state of DSR one has to connect DSR into GPIO input pin in parallel. Then one can watch the state of DSR by reading GPIO data register.

Correct?

BR,

Miyamoto

[b36401 · Accepted solution]

Yes. One can access DSR signal with GPIO.

Please refer to bits description tables of i.MX35 Reference Manual for the details.

Have a great day,

Victor

[Aemj]

Hi team,

I still wait for your comment.

Miyamoto