Adding usb-cdc support into nrf mesh project

[nrf_developer]

Hi all,

we would like to add usb-cdc support for our nrf mesh project. I have tried merging an usbd example project into our application but without success so far. I am having hard time to even compile. Is there a recommended way for doing this? I am using SEGGER Embedded Studio and nRF Connect to program the nRF52840 dongles.

[Marjeris Romero]

Hi Lukas,

We have a coexistance example using the ble_app_uart example of the SDK and the Mesh SDK. You can try to guide yourself with this example and change it to use usb-cdc. Unfortunately we don't have any coexistance example with mesh and usb-cdc support.

Best Regards,

Marjeris

[razor_et]

Hi Bro ,

Do you successful merge USB cdc & mesh now? I 'm working with this purpose without success yet. Can you give me some advice.

[nrf_developer]

Yeah, well it's working mostly fine now just make sure you have the latest version of softdevice. I believe prior versions can't handle the usb and ble at the same time. Lastly, make sure you have USBD_POWER_DETECTION disabled. This is the code I used in our application (please note this may not be the best way to do that, but at least it's working):

static void cdc_acm_event_handler(app_usbd_class_inst_t const * p_inst,
                                  app_usbd_cdc_acm_user_event_t event)
{
  // handle incoming data
}

static void usbd_event_handler(app_usbd_event_type_t event)
{
  // empty, we're not using this one
}

APP_USBD_CDC_ACM_GLOBAL_DEF(m_app_cdc_acm,
                            cdc_acm_event_handler,
                            CDC_ACM_COMM_INTERFACE,
                            CDC_ACM_DATA_INTERFACE,
                            CDC_ACM_COMM_EPIN,
                            CDC_ACM_DATA_EPIN,
                            CDC_ACM_DATA_EPOUT,
                            APP_USBD_CDC_COMM_PROTOCOL_AT_V250
);

static void usbd_init(void)
{    
    static const app_usbd_config_t usbd_config = {
        .ev_state_proc = usbd_event_handler
    };
    ERROR_CHECK(nrf_drv_power_init(NULL));
    ERROR_CHECK(nrf_drv_clock_init());

    app_usbd_serial_num_generate();
    ERROR_CHECK(app_usbd_init(&usbd_config));

    app_usbd_class_inst_t const * class_cdc_acm = 
        app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
    ERROR_CHECK(app_usbd_class_append(class_cdc_acm));
}

static void start(void)
{
    if (USBD_POWER_DETECTION)
    {
        ERROR_CHECK(app_usbd_power_events_enable());
    }
    else
    {
        app_usbd_enable();
        app_usbd_start();
    }
}

[JEFT]

Hello, @nrf_developer witch version of the softdevice are you using? unfortunately I had no success using your code, it runs, but the PC doesn't recognizes as a COM device