USBX-Device: ACM-CDC dual

[ModicaPaolo]

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.

[ayedm1]

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