cdc_acm.rs

impl<U: UsbCore> UsbClass<U> for CdcAcmClass<U> {
    fn configure(&mut self, mut config: Config<U>) -> Result<()> {

        const DESC: InterfaceDescriptor = InterfaceDescriptor::class(USB_CLASS_CDC)
            .sub_class(CDC_SUBCLASS_ACM).protocol(CDC_PROTOCOL_NONE);

        let mut assoc = config.interface_association(DESC)?;

        assoc
            .interface(
                &mut self.comm_if,
                DESC)?

            .descriptor(
                CS_INTERFACE,
                &[
                    CDC_TYPE_HEADER, // bDescriptorSubtype
                    0x10, 0x01 // bcdCDC (1.10)
                ])?

            .descriptor(
                CS_INTERFACE,
                &[
                    CDC_TYPE_ACM, // bDescriptorSubtype
                    0x00 // bmCapabilities
                ])?

            .descriptor(
                CS_INTERFACE,
                &[
                    CDC_TYPE_UNION, // bDescriptorSubtype
                    (&self.comm_if).into(), // bControlInterface
                    (&self.data_if).into() // bSubordinateInterface
                ])?

            .descriptor(
                CS_INTERFACE,
                &[
                    CDC_TYPE_CALL_MANAGEMENT, // bDescriptorSubtype
                    0x00, // bmCapabilities
                    (&self.data_if).into() // bDataInterface
                ])?

            .endpoint_in(&mut self.comm_ep)?;

        assoc
            .interface(
                &mut self.data_if,
                InterfaceDescriptor::class(USB_CLASS_CDC_DATA))?

            .endpoint_in(&mut self.write_ep)?
            .endpoint_out(&mut self.read_ep)?;

        Ok(())
    }