57 lines
1.2 KiB
Arduino
57 lines
1.2 KiB
Arduino
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/*
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Read all data after interrupt
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by Mischianti Renzo <http://www.mischianti.org>
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https://www.mischianti.org/2019/01/02/pcf8575-i2c-digital-i-o-expander-fast-easy-usage/
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*/
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#include "Arduino.h"
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#include "PCF8575.h"
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// For arduino uno only pin 1 and 2 are interrupted
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#define ARDUINO_UNO_INTERRUPTED_PIN 2
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// Function interrupt
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void keyChangedOnPCF8575();
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// Set i2c address
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PCF8575 pcf8575(0x39, ARDUINO_UNO_INTERRUPTED_PIN, keyChangedOnPCF8575);
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unsigned long timeElapsed;
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void setup()
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{
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Serial.begin(115200);
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pcf8575.pinMode(P0, INPUT);
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pcf8575.pinMode(P1, INPUT);
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pcf8575.pinMode(P2, INPUT);
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pcf8575.pinMode(P3, INPUT);
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pcf8575.begin();
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Serial.println("START");
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timeElapsed = millis();
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}
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bool keyChanged = false;
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void loop()
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{
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if (keyChanged){
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PCF8575::DigitalInput di = pcf8575.digitalReadAll();
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Serial.print("READ VALUE FROM PCF P1: ");
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Serial.print(di.p0);
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Serial.print(" - ");
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Serial.print(di.p1);
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Serial.print(" - ");
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Serial.print(di.p2);
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Serial.print(" - ");
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Serial.println(di.p3);
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// delay(5);
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keyChanged= false;
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}
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}
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void keyChangedOnPCF8575(){
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// Interrupt called (No Serial no read no wire in this function, and DEBUG disabled on PCF library)
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keyChanged = true;
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}
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