An error occurs in [Serial emulator] in the [Validation] tab of NANOEDGE AI STUDIO

hashimoto_m · ‎2024-11-20

When I select the library in the [Validation] tab of NANOEDGE AI STUDIO and run [Serial emulator], I get the error message "No data are being received. Please ensure the correct COM port is selected."
However, I am able to obtain data if I select the same COM port using TeraTerm (terminal emulator).
Incidentally, the same error occurs whether the baud rate is 9600 or 115200.
The board I am using is B-L475E-IOT01A2.
Does anyone have any information on the cause of this?

Julian E. · ‎2024-12-02

Hello @hashimoto_m,

So, there are only 158 values in the files that you sent me.

In the project that you shared you used 512 values per lines.

I think that your issue is that you are logging all your data as a single, infinite line.

What to need to do is to add a "return line" at the end of each of your 512 buffers before importing them.

Something like:

while(1){
   for (i = 0; i < YOUR_BUFFER_SIZE; i++) {
      printf("%d", i);
   } 
   printf("\n);
}

The code above is just to make you understand what I mean, but in your case, you are logging 256 times 2 out of the 3-axis accelerometer, so you need to adapt it.

I attached an example of a correctly formatted file.

Julian

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Julian E. · ‎2024-11-21

Hello @hashimoto_m,

try to close every app that may use the COM port and retry.

Can you share the logs please?

You can find them here:

Julian

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liaifat85 · ‎2024-11-21

NanoEdge AI Studio may sometimes fail to release and reconnect to the COM port. You can close and reopen NanoEdge AI Studio. Then reconnect the B-L475E-IOT01A2.

Julian E. · ‎2024-11-21

Hello @liaifat85,

Thanks for the comment, it is interesting to know.

For your information, everything related to serial is being redone for the next update.

Do not hesitate to tell us if you see strange behavior like that in this current version or in the next ones

Have a good day

Julian

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hashimoto_m · ‎2024-11-21

Hello.Julian, thank you for your reply. I will upload the log file.

Julian E. · ‎2024-11-22

Hello @hashimoto_m,

There is no error in the logs.

Can you please export your nanoedge ai project and a screenshot of the data you send via serial in tera term?

Thanks,

Julian

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hashimoto_m · ‎2024-11-25

Hello Julian
Thank you for your reply.
I will upload the screenshots and export data.

Julian E. · ‎2024-11-26

Hello @hashimoto_m ,

It is pretty strange, but we are investigating it.

Are you able to log data in the "Signal step" using serial?

Are you sure you are sending signals buffer by buffer via serial, not continuously?

Have a good day,

Julian

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hashimoto_m · ‎2024-11-26

Hello Julian
Thank you for your reply.

Does "Signal step" mean communication for each single piece of data?
The result is the same error whether it's a single data or every two axes.
For USB control, I've added USB_DEVICE to Pinout&Configuration in XXX.ioc and am calling the CDC_Transmit_FS function in usbd_cdc_if.c to perform serial communication.
Is this a problem?

Julian E. · ‎2024-11-27

Hello @hashimoto_m,

The "Signal step" is the part in NanoEdge where you add your dataset (after the project settings).

In there you can add .csv or .txt but you can also import data via serial. So, my question is: Do you also get an issue here (knowing if it works help us identify where the issue comes from).

The data that you send via serial, should look like something like this:

X1,Y1,X2,Y2....X253,Y256\n

....

You need to send the data buffer per buffer, not continuously:

X1,Y1,X2,Y2....Xinfinite,Xinfinite

We have a github repository with example datalogging code, you may take a look:;

stm32ai-nanoedge-datalogger/Drivers at main · stm32-hotspot/stm32ai-nanoedge-datalogger · GitHub

Have a good day

Julian

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