[QNX 7.0_x86_generic] Serial Port Data Receive Issue

johnbevy · October 17, 2019, 3:18pm

Tim:

Hi John,

I’ve only got experience with 232 mode in QNX but I’ve never had any problems sending/receiving in 232 mode. That’s why I asked whether you had tried a 232 cable. I’d also suggest getting 232 mode working first since that’s the easier one to work with.

Your stty looks quite similar to mine other than some minor differences like the imaxbel and onlcr options which should not be a problem. The cat command normally works just fine to show incoming data for me when I’m testing and your sample program looks fine too.

Is there a chance the actual physical serial port on your machine is bad (or the UART on the machine isn’t an 8250)? In other words do you have another serial port on that machine to try or another machine you can install QNX7 on to test or can you swap out the harddrive/CF card containing QNX for a Linux one.

Tim

Hi Tim,

Thanks for your reply.

In order to confirm the hardware, we have checked the same setup (hardware/cables) with Ubuntu OS and confirmed that we are able to receive and transmit properly in all 3 modes (RS232/RS422/RS485).

I have found another guy faced the same issue. Cat also not works for them. Please refer the below link,

openqnx.com/phpbbforum/viewtopi … 10&t=12915

Apart from serial port, we have below issues

Not able to record audio using “waverec” command and using “wave” command able to play audio file.

But in 8 -bit mode, High noise is recording. - The same setup works fine in Ubuntu

Password changing - Not able to change the user account password using “passwd” utiltiy. Getting error as "Sorry authentication token busy " . In VM ware, we are able to change the password.

Does the issue related to any read file system issue?

It would be helpful if you provide ideas about audio recording and password changing and serial port data receive.

Thanks,
John