Changing the interface number of devices of a composite device

RE: Changing the interface number of devices of a composite device

tommybdog — Tue, 22 Jul 2025 16:51:53 GMT

Perfect thanks that was it! One thing to note if people find this because I was unable to find it in documentation anywhere. When using:

usbd_register_class(struct usbd_context *const uds_ctx,

const char *name,

const enum usbd_speed speed, const uint8_t cfg)

The name part will always be the type of device and instance. So for me declaring HID stuff, the first name is "hid_0" then "hid_1" and so on. CDC is then "cdc_acm_0". It does not matter what they are named in the devicetree.

RE: Changing the interface number of devices of a composite device

Vidar Berg — Tue, 22 Jul 2025 06:22:26 GMT

Hello,

I received this suggestion from one of our developers:

"sample_usbd_init_device()should not be used in this case. Copy the contents of sample_usbd_init_device() to the application, and replace usbd_register_all_classes() with the individual class registrations in the desired order.

Class removal after calling sample_usbd_init_device() does not work because the interfaces and endpoints are assigned in usbd_init() -> usbd_device_init_core() -> usbd_init_configurations() -> init_configuration(), and usbd_init() is called inside sample_usbd_init_device()"

Hope this helps.

Best regards,

Vidar

RE: Changing the interface number of devices of a composite device

tommybdog — Mon, 21 Jul 2025 09:22:30 GMT

CONFIG_USB_DEVICE_STACK_NEXT=y
CONFIG_USB_DEVICE_STACK=n
CONFIG_USBD_HID_SUPPORT=y

CONFIG_LOG=y
CONFIG_USBD_LOG_LEVEL_WRN=y
CONFIG_USBD_HID_LOG_LEVEL_WRN=y
CONFIG_UDC_DRIVER_LOG_LEVEL_WRN=y

CONFIG_SAMPLE_USBD_MANUFACTURER="xxx"
CONFIG_SAMPLE_USBD_PRODUCT="xxxx"
CONFIG_SAMPLE_USBD_MAX_POWER=250
CONFIG_SAMPLE_USBD_20_EXTENSION_DESC=y
CONFIG_SAMPLE_USBD_SELF_POWERED=n

CONFIG_GPIO=y
CONFIG_INPUT=y

# Enhanced ShockBurst configuration
CONFIG_ESB=y
CONFIG_UART_CONSOLE=n
CONFIG_USBD_CDC_ACM_CLASS=y
##CONFIG_USBD_HID_INIT_PRIORITY=01 this didn't do anything

# Prevent CDC ACM from auto-registering at boot
CONFIG_CDC_ACM_SERIAL_INITIALIZE_AT_BOOT=n

here is my prj.conf btw. I also tried setting CONFIG_USBD_CDC_ACM_CLASS=n and then registering with what I declared in my device tree but CDC won't work at all that way