scanf does not work

[Rajneesh]

Hello,

I have include stdio.h library file and configure uart . Used printf to print data over uart to terminal. Now I wants same thing reverse get data(scanf) from terminal (via uart). But I am failing to get data.

Can any one help me how can I get data from terminal(via uart) ?

Regards, Rajneesh

[Øyvind Karlsen]

Hi,

I'm not sure that I understand your question.

There's no scanf() in the code, characters either come over the UART or they come over the connection from the app/ other device.

The data from UART is read by the function app_uart_get(&data_array[index]) in the uart_event_handle().

Best regards,

Øyvind

[Øyvind Karlsen]

Hi,

Well the function app_uart_get() uses the UART driver

uint32_t app_uart_get(uint8_t * p_byte)
{
    ASSERT(p_byte);
    // If FIFO was full new request to receive one byte was not scheduled. Must be done here.
    if (FIFO_LENGTH(m_rx_fifo) == m_rx_fifo.buf_size_mask)
    {
        uint32_t err_code = nrf_drv_uart_rx(rx_buffer,1);
        if (err_code != NRF_SUCCESS)
        {
            return NRF_ERROR_NOT_FOUND;
        }
    }
    return app_fifo_get(&m_rx_fifo, p_byte);
}

And the UART driver is just an interface for the hardware registers.