nRF_SDK_17.1.0 s140 pca10056 BLE_UART

[kleanthise]

Hello all,

I am trying to develop an application where the user will input some specific commands i.e hex value of 0x01 via a mobile application and then via bluetooth this command will be passed to the computer using UART.

I have compiled the ble app uart on my nrf52840 but i am struggling to modify the code for my application.

Could someone help me with this ? 

Thanks

Kleanthis

[kleanthise]

Thank you now when i send the command 0x01 via nrf connect from my phone i can see on termite that the device is activated. Now regarding the second part of my previous question. I would like when the user inputs that command (0x01 via BLE) to transfer it via UART to my computer. I have studied the app_uart function but i could not find any information on how i can transfer that command to UART.

Could it be possible to help me with that ? I am guessing i shall introduce the m_device_state inside that function and when is set to 1 then it will transfer the data through the data_array ? 

/**@brief   Function for handling app_uart events.
 *
 * @details This function will receive a single character from the app_uart module and append it to
 *          a string. The string will be be sent over BLE when the last character received was a
 *          'new line' '\n' (hex 0x0A) or if the string has reached the maximum data length.
 */
/**@snippet [Handling the data received over UART] */
void uart_event_handle(app_uart_evt_t * p_event)
{
    static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
    static uint8_t index = 0;
    uint32_t       err_code;

    switch (p_event->evt_type)
    {
        case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;

            if ((data_array[index - 1] == '\n') ||
                (data_array[index - 1] == '\r') ||
                (index >= m_ble_nus_max_data_len))
            {
                if (index > 1)
                {
                    NRF_LOG_DEBUG("Ready to send data over BLE NUS");
                    NRF_LOG_HEXDUMP_DEBUG(data_array, index);

                    do
                    {
                        uint16_t length = (uint16_t)index;
                        err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
                        if ((err_code != NRF_ERROR_INVALID_STATE) &&
                            (err_code != NRF_ERROR_RESOURCES) &&
                            (err_code != NRF_ERROR_NOT_FOUND))
                        {
                            APP_ERROR_CHECK(err_code);
                        }
                    } while (err_code == NRF_ERROR_RESOURCES);
                }

                index = 0;
            }
            break;

        case APP_UART_COMMUNICATION_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_communication);
            break;

        case APP_UART_FIFO_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_code);
            break;

        default:
            break;
    }
}

[Karl Ylvisaker]

kleanthise said:

Could it be possible to help me with that ? I am guessing i shall introduce the m_device_state inside that function and when is set to 1 then it will transfer the data through the data_array ? 

Yes, but you are looking in the wrong function it seems - the uart_event_handle is used to handle the UART events, which primarily is used to handle the messages received / incoming over UART by forwarding them over the BLE link. You can see that in the uart_event_handle function it only really handles data in the APP_UART_DATA_READY event, which is generated whenever data is received over UART.

You should instead add this in the nus_evt_handler, in the handling of the BLE_NUS_EVT_RX_DATA event (which is generated whenever data is received over BLE).
You are on the right path - the approach you describe is correct for the functionality you are after - but you will need to add the app_uart_put function at the right place to implement it.

Best regards,
Karl