mirror of
https://github.com/xreef/PCF8574_library.git
synced 2024-08-30 18:12:18 +00:00
76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/*
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* PCF8574 GPIO Port Expand
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* http://nopnop2002.webcrow.jp/WeMos/WeMos-25.html
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*
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* PCF8574 ----- WeMos
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* A0 ----- GRD
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* A1 ----- GRD
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* A2 ----- GRD
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* VSS ----- GRD
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* VDD ----- 5V/3.3V
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* SDA ----- GPIO_4
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* SCL ----- GPIO_5
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* INT ----- GPIO_13
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*
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* P0 ----------------- BUTTON0
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* P1 ----------------- BUTTON1
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* P2 ----------------- BUTTON2
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* P3 ----------------- BUTTON3
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* P4 ----------------- BUTTON4
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* P5 ----------------- BUTTON5
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* P6 ----------------- BUTTON6
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* P7 ----------------- BUTTON7
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*
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*/
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#include "Arduino.h"
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#include "PCF8574.h" // https://github.com/xreef/PCF8574_library
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#define ESP8266_INTERRUPTED_PIN 13
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// Set i2c address
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PCF8574 pcf8574(0x20);
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// Function interrupt
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bool keyPressed = false;
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void ICACHE_RAM_ATTR keyPressedOnPCF8574(){
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// Serial.println("keyPressedOnPCF8574");
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keyPressed = true;
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}
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void setup()
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{
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Serial.begin(9600);
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delay(1000);
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pinMode(ESP8266_INTERRUPTED_PIN, INPUT_PULLUP);
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attachInterrupt(digitalPinToInterrupt(ESP8266_INTERRUPTED_PIN), keyPressedOnPCF8574, FALLING);
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for(int i=0;i<8;i++) {
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pcf8574.pinMode(i, INPUT);
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}
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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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}
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void loop()
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{
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if (keyPressed){
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PCF8574::DigitalInput val = pcf8574.digitalReadAll();
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if (val.p0==HIGH) Serial.println("KEY0 PRESSED");
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if (val.p1==HIGH) Serial.println("KEY1 PRESSED");
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if (val.p2==HIGH) Serial.println("KEY2 PRESSED");
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if (val.p3==HIGH) Serial.println("KEY3 PRESSED");
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if (val.p4==HIGH) Serial.println("KEY4 PRESSED");
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if (val.p5==HIGH) Serial.println("KEY5 PRESSED");
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if (val.p6==HIGH) Serial.println("KEY6 PRESSED");
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if (val.p7==HIGH) Serial.println("KEY7 PRESSED");
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keyPressed= false;
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}
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}
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