how to use Simple UART driver?

[purgoufr]

From the SDK8 s110 device, I want to send the string("hello") to the other device via the uart, and in the meantime I want the battery voltage to come through uart.

I defined ;

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;

    switch (p_event->evt_type)
    {
        case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;

           
		if((data_array[index - 2] == 'm') && (data_array[index - 1] == 'V'))
		{
			for(int i=0 ; i<6; i++)
			{
				m_battery_level[i] = data_array[i];
			}
		}
            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;

        default:
            break;
    }
}

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_Baud9600
    };

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

I found the app_uart_put (uint8_t byte) function in app_uart_fifo.c, but I want to send a string. How can I send "Hello" string data over uart connection?

[Joakim Jakobsen]

Hi purgoufr!
Have you considered using one of our later SDK? The SDK v.12.3 is the latest SDK with nRF51 support, and the SDK v14.1 is the latest with nRF52 support. In the latest SDK's there is both a central and peripheral uart example which does exactly what you want.

[purgoufr]

If possible, I'd rather stay at SDK8. Because many devices I can not access are using sdk8. I suppose I want to use sdk 12, would you tell me how I can easily migrate if I can?

[Joakim Jakobsen]

It is possible to stick with the SDK v.8 yes. You should able to send a string using the ble_nus_string_send() function.

[purgoufr]

ble_nus_string_send() function is already exist in sdk8. But I can not send string with use that function. Because ble_nus_string_send() function sends data through ble when it recevie data from UART. But I want to send/receive data through UART line as in ARM Core(not over ble).