ble_app_uart example. send value from putty to dk board.

[pail]

hi dev.

I study ble uart.

and I succeed connecting with dk board(peripheral) and nrf tool box(uart).

and I also connected with dk board and putty. // like that      computer(putty)  <---> dk board(peripheral) <----> smart phone(nrf toolbox / uart) //

so when I typed some words(ex 123, led) in putty, I can see that words in nrf tool box. 

and I can check the value of word "led"

for example, when I put  word - led , in putty,

I received the log in app, nrf toolbox uart - Notification received from 6e400000e-b5a3-f393-e0a9-e50e24dcca9e, value: (0x)6c-65-64-0d

and then what I want is like that -  if I type the value (0x)6c-65-64-0d in putty, I want to make LED3 on dk board turned on.

but... I have kept looking for that info.. I couldn't find it.

 

How can I do that?

[Vidar Berg]

Hello,

You can use memcmp() for this.

E.g.,

#include "nrf_gpio.h"


/**@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)
                {
                
                    if (!memcmp(data_array, "led\r", index))
                    {
                        /* Toggle LED_3 if the value "6c-65-64-0d" is received over UART */
                        nrf_gpio_pin_toggle(LED_3);
                    }
...

Best regards,

Vidar

[pail]

HI vidar berg

thank you for your reply, I can study very well.

I have a question similar to the one above, could I ask you?

it's about uart send data as soon as I power on the board.

[Vidar Berg]

Hi, 

Please create a new ticket for this question. Thanks.