UART Receice Data nrf52840

[MainOFF]

Hi everyone! I have probelem with receice data over UART. In the other MCU use core ARM as : STM32, NXP... when a byte is recieved, MCU has flag to notify. That is "interrupt". But in the NRF52, I can't see it. I always use "polling" mechanism to receive data. How can I use "interrupt" to receive data? thanks!!!

[Sigurd]

Hi,

The UART peripheral interrupts are enabled in the INTENSET registers. I recommend using the UART driver(nrf_drv_uart), where this is handled for you. The app_uart_fifo library uses the nrf_drv_uart, and you can initialize the UART module like this using the app_uart_fifo:

/**@snippet [UART Initialization] */
static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_DISABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud115200
    };

    APP_UART_FIFO_INIT( &comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
}

When UART data has been received, you will get a APP_UART_DATA_READY event if you are using the app_uart_fifo. This is done in many of the examples in the SDK(e.g. ble_app_uart)

[MainOFF]

Thanks for your response. Can I use it as :

void uart_callback_handle(app_uart_evt_t * p_event)
{
    if (p_event->evt_type == APP_UART_COMMUNICATION_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_communication);
    }
     if (p_event->evt_type == APP_UART_FIFO_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_code);
    }
		if( p_event->evt_type == APP_UART_DATA_READY)
		{
			while(app_uart_get(&data)!=NRF_SUCCESS) {};
			data_arr[index]=data;
			index++;
				if(index==10)
				{index=0;xong=1;}
		}		 
}

[Sigurd]

Yes, that should work fine.