/*
 * Copyright (c) 2016, Indian Institute of Science <http://www.iisc.ernet.in>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file is part of the Contiki operating system.
 *
 */
/**
 * \addtogroup cc2538-examples
 * @{
 *
 * \defgroup cc2538-test-uart Test the CC2538 UART
 *
 * Demonstrates the use of the CC2538 UART
 *
 * @{
 *
 * \file
 *         A quick program for testing the UART1 on the cc2538 based
 * platform which can be used to interface with sensor with UART
 * interface and to communicate with other development boards
 * \author
 *         Akshay P M <akshaypm@ece.iisc.ernet.in>
 */
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "sys/etimer.h"
#include "dev/leds.h"
#include "dev/uart.h"
#include "dev/serial-line.h"
#include <stdio.h>
#include <stdint.h>
/*---------------------------------------------------------------------------*/
static struct etimer et;
/*---------------------------------------------------------------------------*/
PROCESS(cc2538_uart_demo_process, "cc2538 uart demo");
AUTOSTART_PROCESSES(&cc2538_uart_demo_process);
/*---------------------------------------------------------------------------*/
unsigned int
uart1_send_bytes(const unsigned char *s, unsigned int len)
{
  unsigned int i = 0;

  while(s && *s != 0) {
    if(i >= len) {
      break;
    }
    uart_write_byte(1, *s++);
    i++;
  }
  return i;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(cc2538_uart_demo_process, ev, data)
{
  char *rxdata;
  static uint16_t count=0;
  char string[20];
  
  PROCESS_BEGIN();
  uart_set_input(1, serial_line_input_byte);
  etimer_set(&et, CLOCK_SECOND * 4);
  leds_toggle(LEDS_GREEN);

  while(1) {
    PROCESS_WAIT_UNTIL(etimer_expired(&et));
    sprintf(string, "sending string %u.\n", ++count);
    uart1_send_bytes((uint8_t *)string, sizeof(string) - 1);
    etimer_reset(&et);
    printf("string is being sent\n");

    PROCESS_YIELD();
    if(ev == serial_line_event_message) {
      leds_toggle(LEDS_RED);
      rxdata = data;
      printf("Data received over UART %s\n", rxdata);
    }
  }

  PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/**
 * @}
 * @}
 */