i.MX Processors中的主题 Re: NXP Serial bouncing C++ messages

NXP Serial bouncing C++ messages

ShantalW — Mon, 08 Aug 2022 20:07:32 GMT

I have a NXP board, MIMXRT1060, that I am trying to have communicate with a C++ program via a Serial Comms USB connection. I am connecting just fine, and receiving messages from the NXP board just fine, but when I attempt to send the board a message I get a response that is the exact message I sent, aka the message bounces instead of being handled. For example, if I send an "updateLED" message expecting and "ACK" and the led to change color I instead get a "updateLED" message and the led doesn't change. If the board sends me a message on it's own I get it just fine. Does anyone know what would be causing this?

Could it be any of these settings? Or am I missing a setting here:
dcbSerialParameters.BaudRate = CBR_115200;
dcbSerialParameters.ByteSize = 8;
dcbSerialParameters.StopBits = ONESTOPBIT;
dcbSerialParameters.Parity = NOPARITY;
dcbSerialParameters.fDtrControl = DTR_CONTROL_ENABLE;

Re: NXP Serial bouncing C++ messages

jeremyzhou — Tue, 09 Aug 2022 01:52:09 GMT

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
According to your description, it seems like you want to implement a shell application on RT1060 to handle the command from the C++ program, if yes, I'd like to suggest using the oscilloscope or logic analyzer to visualize the commands from the C++ program firstly,
then, check the code that handles the corresponding command.
Have a great day,
TIC

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Re: NXP Serial bouncing C++ messages

ShantalW — Tue, 09 Aug 2022 23:52:09 GMT

Hi TIC,

Unfortunately that doesn't answer my question. The NXP side seems to be working okay as I can send it messages via putty and it works as expected, it is only when I send the messages from C++ that it fails.

Thanks,

Shantal

Re: NXP Serial bouncing C++ messages

jeremyzhou — Wed, 10 Aug 2022 02:40:02 GMT

Hi，
Thanks for your reply.
According to your statement, I'd like to suggest using the oscilloscope or logic analyzer to visualize the commands from the C++ program, then compare them with Putty's.
Have a great day,
TIC

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Re: NXP Serial bouncing C++ messages

ShantalW — Wed, 10 Aug 2022 17:12:32 GMT

I unfortunately do not have that sort of equipment. My oscilloscope does not go to a high enough frequency to read USB and I don't have a logic analyzer. We did hook up a JLink and ran the code in debug and noticed we are also getting junk data I am not sending. Do you have any suggestions that I could do with a standard PC?

Thanks,

Shantal

Re: NXP Serial bouncing C++ messages

jeremyzhou — Thu, 11 Aug 2022 02:14:21 GMT

Hi @ShantalW ,
Thanks for your reply.
Maybe you can try to use Wireshark to monitor and capture data go through the USB device which is sent by the C++ program, it can help you to figure out whether the C++ program sends the expected data.

Have a great day,
TIC

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