USB interface in light switch client implemented for nrf-dongle gives mesh assert upon receiving data on USB

[Gecko]

Using 

SW : NRF_SDK_16, SDK_MESH_v4.0

HW:  NRF52840 DONGLE.

I have implemented light_switch_client which also has USB part initialization and then added in USB_DONGLE. I have followed below mentioned guide for the necessary changes while loading the code in dongle

https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial

Now my PC detects Dongle as one of the USB ports.All I want to do is send the data from serial terminal on detected USB PORT and then publish it over the mesh.

Issue as below :-

I am getting app_error_weak.c,  105, Mesh assert at 0x0002C8FA (:0) upon trying to publish the received data over mesh.

1.I think this issue is related to interrupt priority of USB and MESH. Mesh uses NRF_MESH_IRQ_PRIORITY_LOWEST where as USB uses NRFX_USBD_CONFIG_IRQ_PRIORITY 6  as a interrupt priority levels.

Please see the attached code for the reference

        case APP_USBD_CDC_ACM_USER_EVT_RX_DONE:
        {
            
            index++;
            do
            {
              if(m_cdc_data_array[index-1]==0xFA && m_cdc_data_array[index-2]==0x5F)
             {
                __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "ready to publish\n");
                app_onoff_status_publish(&m_onoff_server_0); // publishing the data here which causes the error
                index=0;
                memset(m_cdc_data_array,0,sizeof(m_cdc_data_array));
             }
            



              ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
                                         &m_cdc_data_array[index],
                                         1);
              if (ret == NRF_SUCCESS)
              {
                    index++;
              }
             __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "--index=%d-----\n",index);
             __LOG_XB(LOG_SRC_APP, LOG_LEVEL_INFO,"RX: Msg : Received", m_cdc_data_array,index);

            }while(ret == NRF_SUCCESS);

[Sama]

Hi,

I have the same problem with the nrf 52840 devkit.

I added USB into the client codes and want to send data from pc through the USB and then over the mesh. I get the error you got,

Did you manage to solve that? Could you please share your solution?

Thank you in advance.

Br,

Sama

[tesc]

Hi,

I assume that the issue you see is what you describe in Using UART1 for SDK and UART0 for Mesh. In case you get no further answers here, that thread would be the place to look for anyone experiencing similar issues in the future.

Regards,
Terje