123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: hello-world.c,v 1.1 2006/10/02 21:46:46 adamdunkels Exp $
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*/
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/**
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* \file
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* A very simple Contiki application showing how Contiki programs look
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#define RANDOM_NUMBER_COUNT 3
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#define RANDOM_NUMBER_MAX_VALUE 2.5
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#include "contiki.h"
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#include "lib/random.h"
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#include <stdio.h> /* For printf() */
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typedef unsigned short USHORT;
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//print a unsigned short (as returned from rand) picewise char by char
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void
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putShort(USHORT in)
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{
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// recursively shift each digit of the int to units from most to least significant
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if (in >= 10)
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{
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putShort(in / 10);
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}
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// isolate unit digit from each number by modulo and add '0' char to turn integer into corresponding ascii char
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putchar((in % 10) + '0');
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}
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void
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putFloat(float in)
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{
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if(in < 0)
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{
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putchar('-'); // print negative sign if required
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in = -in;
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}
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USHORT integerComponent = (USHORT) in; // truncate float to integer
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float fractionComponent = (in - integerComponent) * 1000; // take fraction only and promote to integer
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if (fractionComponent - (USHORT)fractionComponent >= 0.5) fractionComponent++; // round
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putShort(integerComponent);
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putchar('.');
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putShort((USHORT) fractionComponent);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS(hello_world_process, "Hello world process");
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AUTOSTART_PROCESSES(&hello_world_process);
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(hello_world_process, ev, data)
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{
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PROCESS_BEGIN();
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printf("Printing rands\n");
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USHORT randomNumbers[RANDOM_NUMBER_COUNT]; //array for retreived random numbers
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float normalisedRandomNumbers[RANDOM_NUMBER_COUNT]; //array for those rands normalised between 0 and 2.5
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float total = 0;
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int i;
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for(i = 0; i < RANDOM_NUMBER_COUNT; i++)
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{
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USHORT nextRand = random_rand();
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float normalisedRand = ((float) nextRand / RANDOM_RAND_MAX ) * RANDOM_NUMBER_MAX_VALUE;
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randomNumbers[i] = nextRand;
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normalisedRandomNumbers[i] = normalisedRand;
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total = total + normalisedRand;
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putShort(nextRand);
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putchar('\n');
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putFloat(normalisedRand);
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putchar('\n');putchar('\n');
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}
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printf("Printed rands\n");
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printf("Total of random numbers: ");
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putFloat(total);
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putchar('\n');
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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