how to generate app_uart_evt customly?

[Deep_Bang]

Hi Nordic Team,

Working Environment:

nRF52832 DK, nRF17.1.0 SDK, Keil uVision 5 IDE, Windowns10 pro PC.

I am working on ble_app_uart.c Peripheral example.

According to my understanding => Here when we press a keyboard button , the  'app_uart_evt' generated, so 'uart_evt_handler()'  function activated ,

collects  keyboard characters in 'data_array()'  and send to BLE connected device through NUS .

now, my requirement is , need to send characters by configuring development kit buttons . how can i acheive this.?

the 'bsp_event_t' configuration will not trigger uart_evt_handler().

any suggestions?

kind regards,

Deepthi

[Karl Ylvisaker]

Hello Deepthi,

now, my requirement is , need to send characters by configuring development kit buttons . how can i acheive this.?

the 'bsp_event_t' configuration will not trigger uart_evt_handler().

any suggestions?

You can expand the functionality of the BSP module already in use in the application by using the bsp_event_to_button_action_assign to add events to different button actions as part of the buttons_leds_init function, and then adding specific handling of those events to the bsp_event_hander function that will be called when these events are generated.
Here you can add the 'send characters' functionality, which will happen each time the specified button action happens.

Best regards,
Karl

[Deep_Bang]

Karl Ylvisaker said:

Here you can add the 'send characters' functionality, which will happen each time the specified button action happens.

hi Karl,

Thankyou for the suggestion. just a clarification on 'send characters' . For,  send characters via BLE means, we need to use ble_nus_data_send() function only know.

i.e

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);

Kind regards,

Deepthi

[Karl Ylvisaker]

Hello again, Deepthi

Deep_Bang said:

I achieved my objective with your suggestion . Thank you.

I am glad to hear that you were able to achieve the desired functionality with my suggestion, great! :) 

Deep_Bang said:

  now , these received characters on nRF52840 NUS has to be transmitted to USB.

which function i have to look for this job?

The default behavior of the BLE NUS example is for the nRF52840 to output all characters received over BLE to the UART.
To see the characters please open a serial terminal on your connected computer using the parameters described in the example documentation.

Best regards,
Karl

[Deep_Bang]

Karl Ylvisaker said:

The default behavior of the BLE NUS example is for the nRF52840 to output all characters received over BLE to the UART.

hi Karl,

I observed that .

now, my requirement to print these characters on text or notepad window via USB.(As 52840DK at my receiver end support USB tranmission)

any suggestion for this?

kind regards,

Deepthi 

[Deep_Bang]

hi Karl,

For your information, at receiver i.e nRF52840 DK end , i have successfully merged usbd_hid_composite .c example with ble_app_uart_c .

[Karl Ylvisaker]

Hello again, Deepthi

Deep_Bang said:

now, my requirement to print these characters on text or notepad window via USB.(As 52840DK at my receiver end support USB tranmission)

any suggestion for this?

Unfortunately no, I do not have any recommendations for how you should proceed to do this, sorry.

I suppose you will need to make a program for windows that monitors the UART input and saves it to a .txt file or similar. I should think that a couple of serial terminals already offer this functionality, but I am not sure.

Best regards,
Karl

[Karl Ylvisaker]

Deep_Bang said:

For your information, at receiver i.e nRF52840 DK end , i have successfully merged usbd_hid_composite .c example with ble_app_uart_c .

Ah, if you want the characters to be typed into notepad, like with a keyboard, you can start out with the HID keyboard example instead.
This example shows you how to have the DK 'type' characters on your computer, through registering as a keyboard instead of a generic UART input.

Best regards,
Karl

[Deep_Bang]

Karl Ylvisaker said:

HID keyboard example

where can i find this example.

Kind Regards,

Deepthi

[Karl Ylvisaker]

You can find the HID keyboard example in the SDK_ROOT/examples/ble_peripheral location, and you can read about it here.

Best regards,
Karl