Send string without terminal

RE: Send string without terminal

Adnan Alvee — Sun, 13 Mar 2016 19:24:07 GMT

I am also looking a way to send a string without the terminal, ble_nus_string_send function only works in the uart_event_handle() and APP_UART_DATA_READY is only triggered when pressing enter in the terminal(termite). Can someone please post a solution

RE: Send string without terminal

10Hsin — Tue, 19 Jan 2016 12:39:57 GMT

I think I have a better description of my problem. nus_data_handler() is called in service_init(), uart_event_handle() is called in uart init().

So if I want to keep sending a string, which part should this function related to?

RE: Send string without terminal

10Hsin — Mon, 18 Jan 2016 03:20:12 GMT

I ask this question because I put your code in main

    uint8_t data_array[12] = {'H', 'e ', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd', '\n'};
    uint8_t length_of_data = 12;
    err_code = ble_nus_string_send(&m_nus, data_array, length_of_data);
    APP_ERROR_CHECK(err_code);

but the device become unconnectable or I should call ble_nus_string_send() in some specific place

RE: Send string without terminal

fredriksundt — Sun, 17 Jan 2016 17:14:59 GMT

I am not sure if I understand your question. I believe the function uart_event_handle() handles the events from the terminal. If you want to write something to tx you can use the function ble_nus_string_send () as shown above. It can be called from different parts of the program.

RE: Send string without terminal

10Hsin — Sun, 17 Jan 2016 13:23:14 GMT

So, if I want to write directly to Tx, I modify this function uart_event_handle, right?

RE: Send string without terminal

10Hsin — Sun, 17 Jan 2016 10:18:07 GMT

Thanks a lot, fredriksundt. This works wel!!

RE: Send string without terminal

fredriksundt — Sun, 17 Jan 2016 09:31:45 GMT

Hello. Are you using the softdevice s110? If you are, you should use the function ble_nus_string_send( ) to send the data from the nrf51 chip. As an example I have changed the nus_data_handler( ), which handles the data received from the App. Here you see how the nrf51 chip can send data to the application, and also how it can react to data received:

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
	uint32_t       err_code;
	if (p_data[0] == 'a') { //If first character is 'a'
		uint8_t data_array[12] = {'a', ' ', 'r', 'e', 'c', 'e', 'i', 'v', 'e', 'd', '\n'};
		uint8_t length_of_data = 12;
		err_code = ble_nus_string_send(&m_nus, data_array, length_of_data);
		APP_ERROR_CHECK(err_code);
    }
	else {
		err_code = ble_nus_string_send(&m_nus,  p_data, length);
		APP_ERROR_CHECK(err_code);
	 }
}

If the first character is 'a' then the string "a received" is sent back to the application. If not the received characters is echoed back to the application.

ble_nus_string_send can be called from other parts of the code, for instance from a function that reads some sensor data.