File content as of revision 0:c862449fe089:

/* 
 * Naam:            PCF8574_ButtonPress
 *
 * Omschrijving:
 *                  I2C testprogramma:
 *                  -Configureer PCF8574 4x OUT, 4x IN.
 *                  -Zet alle PCF8574-Leds aan en geef terminal echo.
 *                  -Zet alle PCF8574-Leds uit en geef terminal echo.
 *                  -Zet led 2 aan ten teken 'Initialisatie Klaar' en geef terminal echo.
 *                  -Als PCF8574-Knop# ingedrukt: PCF8574-Led# aan
 *                  -Als PCF8574-Knop# losgelaten: PCF8574-Led# uit.
 *
 * Aanmaakdatum:    04 april 2016
 * 
 * Geschreven door: Marout Yasuo Sluijter-Borms
 * 
 * Copyright (c) 2016, MYSB, The Manhattan Project
 * Zie einde programma /  See end of program.
 */ 
 
/*  Libraries en classes insluiten  */
#include "mbed.h"
#include "PCF8574.h"

/*  Definieer seriële poorten       */
Serial pc(USBTX, USBRX);            //  tx, rx communicatie met PC terminal via USB.
I2C i2c_bus( p9, p10);              //  I2C bus.
PCF8574 pcf0( p9, p10, 0x70);       //  Eerste PCF8574 chip
PCF8574 pcf1( p9, p10, 0x72);       //  Tweede PCF8574 chip


/*  Definieer digitale IO           */
DigitalOut led(LED2);               //  Led 2 op mbed is signaal 'Initialisatie klaar'.

/*  Definieer Analoge IO            */

/*  Definieer globale variabelen    */
char DataIn;                        //  Data ingelezen van PCF8574
char DataOut;                       //  Data te schrijven naar PCF8574

/*  Definieer globale constanten    */
// const int chipaddress = 0x40;           //  Adres van de PCF8574
const int i2c_speed = 400000;           //  Bussnelheid 400kHz
const int baudrate = 38400;             //  Baudrate communicatie met terminal

/*  Start hoofprogramma             */

int main()
{
//    pc.baud(baudrate);                 //  stel baudrate in van usb serial
    pc.printf("\x1B\x48\x1B\x4A\r");        // scherm schoon en cursor linksboven
    pc.printf("PCF8574A als bidirectionele IO\n\r");

    i2c_bus.frequency( i2c_speed);          //  Zet de I2C bus op 400kHz

    pc.printf("Zet I2C speed op %d Hz.\n\r", i2c_speed);        //  echo naar de terminal

    while (1)
        {
            DataOut = 0xF0;
//            pcf0.write(DataOut);
            DataIn = pcf0.read();       //  lees eerste chip uit
            pc.printf("Waaarde van inputs: %d.\r\n", DataIn);        //  echo gelezen data naar terminal
            wait ( 0.2);
            DataOut = DataIn >> 4;     //  Shift DataIn 4 plaatsen rechts
            pc.printf("Waaarde van outputs: %d.\r\n", DataOut);        //  echo gemodificeerde data naar terminal
            wait ( 0.2);
            pcf0.write(DataOut);
        }       //  endwhile

}       //  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.
 */