RE: Serial Mesh

Atra — Wed, 28 Oct 2020 10:27:21 GMT

Thank you

RE: Serial Mesh

Mttrinh — Mon, 26 Oct 2020 11:05:51 GMT

Hi,

The unknown characters you are seeing is coming from these functions, serial_start() and nrf_mesh_serial_tx(). In the code snippet below I have commented on the parts that printed those, its from opcodes that are being sent.

Inside nrf_mesh_serial.c:

uint32_t nrf_mesh_serial_tx(uint8_t* p_data, uint32_t length)
{
    if (serial_state_get() != NRF_MESH_SERIAL_STATE_RUNNING)
    {
        return NRF_ERROR_INVALID_STATE;
    }
    if (p_data == NULL)
    {
        return NRF_ERROR_NULL;
    }
    if (length == 0 || length > NRF_MESH_SERIAL_PAYLOAD_MAXLEN)
    {
        return NRF_ERROR_INVALID_LENGTH;
    }

    serial_packet_t * p_evt;
    uint32_t status = serial_packet_buffer_get(SERIAL_PACKET_LENGTH_OVERHEAD + length, &p_evt);
    if (status == NRF_SUCCESS)
    {
        //This part gives the "unknown characters" you see
        p_evt->opcode = SERIAL_OPCODE_EVT_APPLICATION;
        memcpy(p_evt->payload.evt.application.data, p_data, length);
        serial_tx(p_evt); 
    }

    return status;
}

Inside serial.c:

uint32_t serial_start(void)
{
    if (m_state != NRF_MESH_SERIAL_STATE_INITIALIZED)
    {
        __LOG(LOG_SRC_SERIAL, LOG_LEVEL_WARN, "Not initialized.");
        return NRF_ERROR_INVALID_STATE;
    }
    m_state = NRF_MESH_SERIAL_STATE_RUNNING;
    /* Send device started event. */
    serial_packet_t * p_start_packet;
    /* Should not fail: */
    uint32_t err_code = serial_packet_buffer_get(sizeof(serial_evt_device_started_t) + NRF_MESH_SERIAL_PACKET_OVERHEAD, &p_start_packet);
    if (NRF_SUCCESS != err_code)
    {
        __LOG(LOG_SRC_SERIAL, LOG_LEVEL_ERROR, "Unable to get a serial packet buffer, error_code: %u\n", err_code);
        m_state = NRF_MESH_SERIAL_STATE_INITIALIZED;
    }
    else
    {
        //This part gives out the "unknown characters" you see
        p_start_packet->opcode = SERIAL_OPCODE_EVT_DEVICE_STARTED;
        p_start_packet->payload.evt.device.started.operating_mode = SERIAL_DEVICE_OPERATING_MODE_APPLICATION;
        p_start_packet->payload.evt.device.started.hw_error = NRF_POWER->RESETREAS & RESET_REASONS_HW_ERROR;
        p_start_packet->payload.evt.device.started.data_credit_available = NRF_MESH_SERIAL_PAYLOAD_MAXLEN;
        serial_tx(p_start_packet);
    }
    return err_code;
}

Also be aware that it is not expected to have any user interface(human text) on serial in this example. Logging is printed out on RTT. So this is not the interface to print logs or send commands via terminal.

RE: Serial Mesh

Atra — Mon, 26 Oct 2020 10:46:45 GMT

I got that unknown characters even there is no modification. Should I disable the nRF LOG to ensure a reliable serial connection? Could there be a link between the my serial problem and RTT?

RE: Serial Mesh

Atra — Wed, 21 Oct 2020 14:31:06 GMT

Hi Mttrinh,

yes I added only these 2 lines of code. Today I asked a colleague at work to download the SDKs and try this code in different machine. The result is same.

RE: Serial Mesh

Mttrinh — Wed, 21 Oct 2020 14:02:27 GMT

Hi,

Was this the only modifications you made to the serial example?