ble_app_uart example. send value from putty to dk board.

Question

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 · Accepted Answer

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' '
' (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] == '
') ||
 (data_array[index - 1] == '') ||
 (index >= m_ble_nus_max_data_len))
 {
 if (index > 1)
 {
 
 if (!memcmp(data_array, "led", index))
 {
 /* Toggle LED_3 if the value "6c-65-64-0d" is received over UART */
 nrf_gpio_pin_toggle(LED_3);
 }
... 
 Best regards, 
 Vidar

ble_app_uart example. send value from putty to dk board.

Top Replies