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USBX-Device: ACM-CDC dual

Open ModicaPaolo opened this issue 1 year ago • 1 comments

Hello,

  1. Is it possible to use the USBX stack to expose two ACM-CDC under the same USB?
  2. Is it necessary to register the ACM-CDC class twice under a composite device, or is there a way to show two virtual CDCs under the same class?
  3. I am using USBX and ThreadX on an STM32U575CGU and have successfully implemented a single ACM-CDC. However, I cannot find a way to implement two ACM-CDC instances. If this feature is not currently supported, is it planned to be added in the future?

Thank you.

ModicaPaolo avatar May 29 '24 15:05 ModicaPaolo

Hi @ModicaPaolo

Yes usbx support composite dual cdc acm 1- Update the device descriptor with two cdc acm interface 2- Register two cdc acm class 3- don't forget to configure USB fifo.

For the init of application or the device descriptor you can refer to nxp example maybe it can help you:

https://github.com/nxp-mcuxpresso/mcux-sdk-examples/blob/main/evkmimxrt1015/azure_rtos_examples/usbx_device_composite_cdc_acm_cdc_acm/usbx_device_composite_cdc_acm_cdc_acm.c

ayedm1 avatar May 29 '24 16:05 ayedm1