nRF UART app Send

[FormerMember]

In the nRF UART v2.0 App, the app have the "send" command. And I can send the data to my nRF52 DK, and it print what I'm sending on the Serial monitor.

However, in the ble_app_uart example code, I don't see where this function of code is locate, Does anyone know where in the code this function is called which when we "send" the data from phone to nRF52 and print it out on monitor?

Thanks.

[Roger Clark]

I think what you are looking for is the callback function nus_data_handler() in main.c

The handler is passed to the uart service during initialisation, and the on_write() function in the uart service calls the function pointer (which points to the callback function in main)

If you are not seeing any output on your hardware (UART) pins, then you don't have the TX and RX pins configured correctly for the board you are using.

[FormerMember]

the data send from phone to nRF52 is not display in "int" type,

    static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
    {
    	int send_value;
        for (uint32_t i = 0; i < length; i++)
        {
            while (app_uart_put(p_data[i]) != NRF_SUCCESS);
    	send_value = ((p_data[i]-'0'));
        }
        while (app_uart_put('\r') != NRF_SUCCESS);
        while (app_uart_put('\n') != NRF_SUCCESS);
        printf("send_value: %d\n",send_value);
    }

The problem is when I enter number from 0 to 9 it works fine, but after entered number above 10 it shows the 0-9 again. any idea on how to let it display as integer type number?

Thanks

[Sigurd]

Hi wecare,

You are only storing the last part of the number that was sent. E.g. if you send 42, only the number 2 is stored in send_value. Take a look at this answer for a method on how to store a number sent from the phone by modifying the nus_data_handler().

Note: The method only works with positive numbers, and you need to make some changes for it to work with negative numbers.

[Roger Clark]

The NUS is character not integer based.

If you want to send numbers not text, you probably need to create a custom service to suit your precise needs

[FormerMember]

@Sigurd, I tried your suggest and follow that page code. When I send the 1 from phone to nRF52 I can received number "1", but when I send 2 from phone to nRF52 it received "3" and send 3 received "8". Any idea on why does thing happen? devzone.nordicsemi.com/.../