47 lines
934 B
Arduino
47 lines
934 B
Arduino
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/*
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KeyPressed with 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 keyPressedOnPCF8575();
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// Set i2c address
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PCF8575 pcf8575(0x39, ARDUINO_UNO_INTERRUPTED_PIN, keyPressedOnPCF8575);
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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(P1, INPUT);
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pcf8575.begin();
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timeElapsed = millis();
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}
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bool keyPressed = false;
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void loop()
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{
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if (keyPressed){
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uint8_t val = pcf8575.digitalRead(P1);
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Serial.print("READ VALUE FROM PCF ");
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Serial.println(val);
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keyPressed= false;
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}
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}
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void keyPressedOnPCF8575(){
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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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keyPressed = true;
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}
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