mesure current for BLE advertising with UART service

[finalfantacypro]

Hi,

I want to mesure the current consumption for BLE advertising with my nRF52 DK kit. I did the right thing as in the document(section "Using an ampere-meter for current measurement").

I want to get the average about 3-5uA result. when I disable this function:

 static void uart_init(void)
{
    uint32_t                     err_code;
    app_uart_comm_params_t const comm_params =
    {
        .rx_pin_no    = RX_PIN_NUMBER,
        .tx_pin_no    = TX_PIN_NUMBER,
        .rts_pin_no   = RTS_PIN_NUMBER,
        .cts_pin_no   = CTS_PIN_NUMBER,
        .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
        .use_parity   = false,
        .baud_rate    = UART_BAUDRATE_BAUDRATE_Baud115200
    };

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
} 

I can't get advertising anymore, it's because there are some important initializations for BLE_nus service. How can I seperate this function to still get my advertising and service work.(the current consumption should be around 5uA)

Thanks,

[Joakim Jakobsen]

Hi finalfantacypro! Sorry for the delayed response. Are you working with the ble_app_uart example? And what SDK are you working with? If you are working with the ble_app_uart example, try commenting out/removing the printf("\r\nUART Start!\r\n"); in main() and see if it will start advertising again.

[finalfantacypro]

I use ble_app_uart example and SDK nRF5 14.0. I still got some problem. sometimes it can't disconnect well some times it disconnect automatically. but, I found a special thing, If I open my Tera terminal and connect to my kit. everything works perfectly. It works, as soon as I use Tera terminal to connect kit for debug. otherwise, it just doesn't work even with official nRF Connect app.

[Joakim Jakobsen]

Wouldn't it be easier if you just start advertising, like it's done in this tutorial. And then you measure the current consumption when advertising? There's also tutorials for creating your own service and characteristics.

[finalfantacypro]

Thank you for your answer. I just don't understand this case. If I use nRF52 DK kit with SDK 14.0 UART service with your official app nRF Connect. it doesn't work well. I can't get disconnected or connect properly. Could you please try it, do you get the same result? it's not only about current consumption, it's about connection and disconnection. :)

[Joakim Jakobsen]

Have you done any modifications at all to the code? Can you not get it to work as the example is, straight out of the SDK? Try flashing the precompiled hex-file in the folder: <SDK_Installfolder>\examples\ble_peripheral\ble_app_uart\hex\ble_app_uart_pca10040_s132.hex. I'm afraid I don't have any issues using the example and nRF Connect.