/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */

#include <stdint.h>

#include "nrf.h"
#include "simple_uart.h"
#include "nrf_delay.h"
#include "nrf_gpio.h"

uint8_t simple_uart_get(void)
{
    while (NRF_UART0->EVENTS_RXDRDY != 1)
    {
        // Wait for RXD data to be received
    }

    NRF_UART0->EVENTS_RXDRDY = 0;
    return (uint8_t)NRF_UART0->RXD;
}


bool simple_uart_get_with_timeout(int32_t timeout_ms, uint8_t * rx_data)
{
    bool ret = true;

    while (NRF_UART0->EVENTS_RXDRDY != 1)
    {
        if (timeout_ms-- >= 0)
        {
            // wait in 1ms chunk before checking for status.
            nrf_delay_us(1000);
        }
        else
        {
            ret = false;
            break;
        }
    } // Wait for RXD data to be received.

    if (timeout_ms >= 0)
    {
        // clear the event and set rx_data with received byte.
        NRF_UART0->EVENTS_RXDRDY = 0;
        *rx_data                 = (uint8_t)NRF_UART0->RXD;
    }

    return ret;
}

void simple_uart_put(uint8_t cr)
{
    NRF_UART0->TXD = (uint8_t)cr;

    while (NRF_UART0->EVENTS_TXDRDY != 1)
    {
        // Wait for TXD data to be sent.
    }

    NRF_UART0->EVENTS_TXDRDY = 0;
}


void simple_uart_putstring(const uint8_t * str)
{
    uint_fast8_t i  = 0;
    uint8_t      ch = str[i++];

    while (ch != '\0')
		{
        simple_uart_put(ch);
        ch = str[i++];
    }
}

void simple_uart_config(uint8_t rts_pin_number,
                        uint8_t txd_pin_number,
                        uint8_t cts_pin_number,
                        uint8_t rxd_pin_number,
                        bool    hwfc)
{
/** @snippet [Configure UART RX and TX pin] */
    nrf_gpio_cfg_output(txd_pin_number);
    nrf_gpio_cfg_input(rxd_pin_number, NRF_GPIO_PIN_NOPULL);

    NRF_UART0->PSELTXD = txd_pin_number;
    NRF_UART0->PSELRXD = rxd_pin_number;
/** @snippet [Configure UART RX and TX pin] */
    if (hwfc)
    {
        nrf_gpio_cfg_output(rts_pin_number);
        nrf_gpio_cfg_input(cts_pin_number, NRF_GPIO_PIN_NOPULL);
        NRF_UART0->PSELCTS = cts_pin_number;
        NRF_UART0->PSELRTS = rts_pin_number;
        NRF_UART0->CONFIG  = (UART_CONFIG_HWFC_Enabled << UART_CONFIG_HWFC_Pos);
    }

    NRF_UART0->BAUDRATE      = (UART_BAUDRATE_BAUDRATE_Baud38400 << UART_BAUDRATE_BAUDRATE_Pos);
    NRF_UART0->ENABLE        = (UART_ENABLE_ENABLE_Enabled << UART_ENABLE_ENABLE_Pos);
    NRF_UART0->TASKS_STARTTX = 1;
    NRF_UART0->TASKS_STARTRX = 1;
    NRF_UART0->EVENTS_RXDRDY = 0;
}
