File content as of revision 2:c63fd1eaf215:

/*  Naam:
 *      SPI_LED_HelloWorld
 *
 *  Geschreven door: 
 *      Marout Yasuo Sluijter-Borms
 *
 *  Omschrijving:
 *      8 leds met een schuifregister aansturen op de SPI bus
 *
 *  Aanmaakdatum:
 *      3 mei 2016
 *  Laatste update:
 *      5 mei 2016
 *
 *  Revisie:
 *      3 mei 2016
 *          1 - Basisopzet gemaakt
 *      5 mei 2016
            2 - Definitieve versie
 * 
 *  Copyright (c) 2016, MYSB, The Manhattan Project
 *  Zie einde programma / See end of program.
 */ 
/*  Libraries en classes insluiten  */
#include "mbed.h"

/*  Declareer seriële poorten       */
SPI spi0( P0_9, P0_8, P0_7);        //  spi0: p5 = mosi, p6 = miso, p7 = scl

/*  Declareer digitale IO           */
DigitalOut ss0( P0_6, 1);           //  p8 = slave select 0, actief LAAG! Dus pin hoog om chip te deselecteren!

/*  Declareer Analoge IO            */
/*  Declareer globale variabelen    */
/*  Declareer globale constanten    */
const int patroon[] = {
    0x01,   0x02,
    0x04,   0x08,
    0x10,   0x20,
    0x40,   0x80
    };
    
/*  Definineer macros               */
#define SPI_SPEED       48000000    //  max speed
#define SPI_MODE        3           //  Mode 3: CPOL = 1, CPHA= 1
#define REGISTER_WIDTH  8           //  8-bit register
#define REGISTER_COUNT  1           //  aantal registers in serie
#define LED_ON_TIME     0.02        //  tijd dat LED aan is

/*  Declareer functies              */

/*  Start hoofprogramma             */
int main()
{
    //  intellen SPI bus
    spi0.frequency( SPI_SPEED);     //  Snelheid bus instellen
    spi0.format( REGISTER_WIDTH, SPI_MODE);
                                    //  SPI mode instellen; 
    
    /*  maak schuifregisters leeg   */
    //  selecteer chip
    ss0 = 0;
    for( int i = 0; i < REGISTER_COUNT; ++i) {
        spi0.write( 0x00);          // Schrijf leeg byte naar chip
    }   //  endfor
    //  deselecteer chip
    ss0 = 1;
    
    /*  Schijf patroon naar register    */
    while(1) {
        //  schrijf patroon
        for( int i =0; i < 8; ++i) {
            ss0 = 0;
            spi0.write( patroon[i]);
            ss0 = 1;
            wait( LED_ON_TIME);
        };  //  endfor
    };  //  enwhile
};  //  endmain
/*
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */