topic composite_cdc_vcom_cdc_vcom examples not work in i.MX RT Crossover MCUs

composite_cdc_vcom_cdc_vcom examples not work

dinartal — Wed, 25 Nov 2020 12:15:41 GMT

Hello. I have tried to launch 3 example projects in MCUXpresso IDE called composite_cdc_vcom_cdc_vcom. Description say that:

The demo echoes back any character it receives.

But i see only 2 COM ports appeared and no echo characters if i send data to them. I have looked more closely to project and see that vcomInstance->startTransactions always 0.

Tell me please are example project correct and have tested?

Re: composite_cdc_vcom_cdc_vcom examples not work

mjbcswitzerland — Wed, 25 Nov 2020 14:52:01 GMT

Try one of these to verify the HW (and the PC); they all contain composites with CDC:

https://www.utasker.com/iMX/RT1060.html
https://www.utasker.com/iMX/iMX_RT1062_OEM.html
https://www.utasker.com/iMX/RT1064.html

See the following video for dual-port USB device/host simulation:

https://youtu.be/3irORtbc4e0

In case of difficulties with the standard examples you can fall back on the uTasker project as industrially proven USB-CDC solution.

Regards

Mark
[uTasker project developer for Kinetis and i.MX RT]
Contact me by personal message or on the uTasker web site to discuss professional training, solutions to problems or product development requirements

For professionals searching for faster, problem free i.MX RT 10xx developments the uTasker project holds the key

Re: composite_cdc_vcom_cdc_vcom examples not work

dinartal — Thu, 26 Nov 2020 08:09:35 GMT

i have tested with another terminal app and see that it work