add button and led for PCF8574

Author: thijstriemstra

Button_PCF8574/Button_PCF8574.cpp

@@ -0,0 +1,48 @@
+/*
+  Button_PCF8574.cpp - Control PCF8574 connected button.
+*/
+
+#include "Button_PCF8574.h"
+
+Button_PCF8574::Button_PCF8574(
+    int btn_pin,
+    MultiPlexer_PCF8574* pcf,
+    Method callback
+) {
+  _btnPin = btn_pin;
+  _pcf = pcf;
+  _callback = callback;
+  _lastBtnState = LOW;
+}
+
+void Button_PCF8574::begin() {
+}
+
+void Button_PCF8574::loop() {
+  read();
+}
+
+void Button_PCF8574::read() {
+  /*
+  int buttonReading = _mcp->getPin(_btnPin, _port);
+
+  // if the switch changed, due to noise or pressing
+  if (buttonReading != _lastBtnState) {
+    // reset the debouncing timer
+    _lastDebounceTime = millis();
+  }
+  if ((millis() - _lastDebounceTime) > _debounceDelay) {
+    // if the button state has changed
+    if (buttonReading != _currentBtnState) {
+      _currentBtnState = buttonReading;
+
+      // only toggle if the new button state is HIGH
+      if (_currentBtnState == HIGH) {
+        _callback.callbackIntArg(_btnPin);
+      }
+    }
+  }
+  // save the switch reading
+  _lastBtnState = buttonReading;
+  */
+}

Button_PCF8574/Button_PCF8574.h

@@ -0,0 +1,33 @@
+/*
+  Button_PCF8574.cpp - Control PCF8574 connected button.
+*/
+#ifndef Button_PCF8574_h
+#define Button_PCF8574_h
+
+#include <Arduino.h>
+#include <Method.h>
+#include <MultiPlexer_PCF8574.h>
+
+class Button_PCF8574
+{
+  public:
+    Button_PCF8574(
+      int btn_pin,
+      MultiPlexer_PCF8574* pcf,
+      Method callback
+    );
+    void loop();
+    void begin();
+    void read();
+
+  private:
+    int _btnPin;
+    int _currentBtnState;
+    int _lastBtnState;
+    Method _callback;
+    MultiPlexer_PCF8574* _pcf;
+    unsigned long _lastDebounceTime = 0;
+    unsigned long _debounceDelay = 5;
+};
+
+#endif

LED_PCF8574/LED_PCF8574.cpp

@@ -0,0 +1,41 @@
+/*
+  LED_PCF8574.h - Control LED light using PCF8574 multiplexer.
+*/
+
+#include "LED_PCF8574.h"
+
+LED_PCF8574::LED_PCF8574(
+  int pin,
+  MultiPlexer_PCF8574* pcf,
+  int led_state
+) {
+  _pin = pin;
+  _pcf = pcf;
+  state = led_state;
+}
+
+void LED_PCF8574::begin() {
+	_pcf->pinMode(_pin, OUTPUT);
+}
+
+void LED_PCF8574::loop() {
+}
+
+void LED_PCF8574::update() {
+  _pcf->digitalWrite(_pin, state);
+}
+
+void LED_PCF8574::enable() {
+  state = HIGH;
+  update();
+}
+
+void LED_PCF8574::disable() {
+  state = LOW;
+  update();
+}
+
+void LED_PCF8574::toggle() {
+  state = !state;
+  update();
+}

LED_PCF8574/LED_PCF8574.h

@@ -0,0 +1,32 @@
+/*
+  LED_PCF8574.h - Control LED light using PCF8574 multiplexer.
+*/
+#ifndef LED_PCF8574_h
+#define LED_PCF8574_h
+
+#include "Arduino.h"
+#include <MultiPlexer_PCF8574.h>
+
+class LED_PCF8574
+{
+  public:
+    LED_PCF8574(
+      int pin,
+      MultiPlexer_PCF8574* pcf,
+      int led_state = LOW
+    );
+    int state;
+    void begin();
+    void loop();
+    void enable();
+    void disable();
+    void toggle();
+
+  private:
+    void update();
+
+    int _pin;
+    MultiPlexer_PCF8574* _pcf;
+};
+
+#endif

MultiPlexer_PCF8574/MultiPlexer_PCF8574.cpp

@@ -10,6 +10,8 @@ MultiPlexer_PCF8574::MultiPlexer_PCF8574(uint8_t address) {
 
 void MultiPlexer_PCF8574::begin() {
   Serial.print("Initializing PCF8574... ");
+
+  /*
   // inputs
   int i = 0;
   for (i = 0; i<4; i++) {
@@ -19,6 +21,7 @@ void MultiPlexer_PCF8574::begin() {
   for (i=4; i<8; i++) {
     _expander->pinMode(i, OUTPUT, LOW);
   }
+  */
 
   if (_expander->begin()) {
     Serial.println("OK");
@@ -29,3 +32,11 @@ void MultiPlexer_PCF8574::begin() {
 
 void MultiPlexer_PCF8574::loop() {
 }
+
+void MultiPlexer_PCF8574::pinMode(uint8_t pin, uint8_t mode, uint8_t initialValue) {
+  _expander->pinMode(pin, mode, initialValue);
+}
+
+void MultiPlexer_PCF8574::digitalWrite(uint8_t pin, uint8_t value) {
+  _expander->digitalWrite(pin, value);
+}

MultiPlexer_PCF8574/MultiPlexer_PCF8574.h

@@ -14,6 +14,8 @@ class MultiPlexer_PCF8574
     MultiPlexer_PCF8574(uint8_t address);
     void begin();
     void loop();
+    void pinMode(uint8_t pin, uint8_t mode, uint8_t initialValue = HIGH);
+    void digitalWrite(uint8_t pin, uint8_t value);
 
   private:
     PCF8574* _expander;