mirror of
https://github.com/xreef/PCF8574_library.git
synced 2024-08-30 18:12:18 +00:00
102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
/*
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KeyPressed with interrupt and digital write all
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from P4 to P7
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by Mischianti Renzo <http://www.mischianti.org>
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https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
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*/
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#include "Arduino.h"
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#include "PCF8574.h"
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// For arduino uno only pin 1 and 2 are interrupted
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#define ARDUINO_UNO_INTERRUPTED_PIN D3
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// Function interrupt
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void ICACHE_RAM_ATTR keyPressedOnPCF8574();
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// Set i2c address
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PCF8574 pcf8574(0x38, ARDUINO_UNO_INTERRUPTED_PIN, keyPressedOnPCF8574);
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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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delay(1000);
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Serial.println("INIT");
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pcf8574.pinMode(P0, INPUT);
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pcf8574.pinMode(P1, INPUT_PULLUP);
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pcf8574.pinMode(P2, INPUT);
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pcf8574.pinMode(P3, INPUT);
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pcf8574.pinMode(P7, OUTPUT);
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pcf8574.pinMode(P6, OUTPUT, HIGH);
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pcf8574.pinMode(P5, OUTPUT, LOW);
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pcf8574.pinMode(P4, OUTPUT, LOW);
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Serial.print("Init pcf8574...");
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if (pcf8574.begin()){
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Serial.println("OK");
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}else{
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Serial.println("KO");
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}
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Serial.println("START");
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timeElapsed = millis();
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}
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unsigned long lastSendTime = 0; // last send time
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unsigned long interval = 3000; // interval between sends
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bool startVal = HIGH;
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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 val0 = pcf8574.digitalRead(P0);
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uint8_t val1 = pcf8574.digitalRead(P1);
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uint8_t val2 = pcf8574.digitalRead(P2);
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uint8_t val3 = pcf8574.digitalRead(P3);
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Serial.print("P0 ");
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Serial.print(val0);
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Serial.print(" P1 ");
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Serial.println(val1);
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Serial.print("P2 ");
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Serial.print(val2);
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Serial.print(" P3 ");
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Serial.println(val3);
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keyPressed= false;
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}
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if (millis() - lastSendTime > interval) {
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Serial.print("WRITE VALUE FROM P4 TO P7 ");
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Serial.println(startVal);
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// pcf8574.digitalWrite(P7, startVal);
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bool startVal2 = LOW;
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if (startVal==HIGH) {
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startVal = LOW;
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startVal2 = HIGH;
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}else{
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startVal = HIGH;
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startVal2 = LOW;
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}
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PCF8574::DigitalInput digitalInput;
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digitalInput.p4 = startVal2;
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digitalInput.p5 = startVal;
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digitalInput.p6 = startVal2;
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digitalInput.p7 = startVal;
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pcf8574.digitalWriteAll(digitalInput);
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lastSendTime = millis();
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}
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}
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void keyPressedOnPCF8574(){
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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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