Marout Yasuo Sluijter-Borms
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PCF8574_ButtonPress
Read status of buttons on D5-D7 of PCF8574. Turn on corresponding led D0-D3.
Diff: main.cpp
- Revision:
- 0:c862449fe089
- Child:
- 1:85d249817f55
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Apr 04 20:59:46 2016 +0000 @@ -0,0 +1,91 @@ +/* + * 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. + */