app_uart_put() check that is transmmited all bytes from FIFO?

Question

Hi i have tried with uart example and need to change baudrate after the some string is transmmited over UARTS TX. Is it possible to somehow that to check that all bytes from FIFO are transmmited?

gnrboy · Accepted Answer

for solving this in ble_app_uart example in uart_event_handle function add case APP_UART_TX_EMPTY: and you can do everything what you want later if you must to do something when this event happens. 
 
 P.S. when you start app this evens happens you must add some condition :) that you handle later 
 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]));
 // data_array[index] = data_array[index] & 0x7f;
 index++;

 if ((data_array[index - 1] == '
') ||
 (data_array[index - 1] == '') ||
 (index >= m_ble_nus_max_data_len))
 {
 if (index > 1)
 {
 NRF_LOG_DEBUG("Ready to send data over BLE NUS");
 NRF_LOG_HEXDUMP_DEBUG(data_array, index);
 bsp_board_led_invert(2);
 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);
 }

 index = 0;
 }
 break;

 case APP_UART_COMMUNICATION_ERROR:
 APP_ERROR_HANDLER(p_event->data.error_communication);
 break;

 case APP_UART_FIFO_ERROR:
 APP_ERROR_HANDLER(p_event->data.error_code);
 break;

 case APP_UART_TX_EMPTY:
 if(data[0] == 'q' && data[1] == 'r'){
 bsp_board_led_invert(3);
 }
 break;

 default:
 break;
 }
}

awneil · Answer

There's an Event for that: 
 https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/group__app__uart.html#ga9346b21b144fd9499e24853bbf781e17 
 See also: 
 https://devzone.nordicsemi.com/f/nordic-q-a/44934/check-uart-transmit-complete-in-nrf52832/176714#176714

app_uart_put() check that is transmmited all bytes from FIFO?

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