From cfa7192f5f6abe6c559da5cdfd371fec459c5d52 Mon Sep 17 00:00:00 2001
From: Anatole SCHRAMM <AS@isitecc.com>
Date: Thu, 2 May 2019 17:20:52 +0200
Subject: [PATCH] Added the togglePin method to the library

---
 src/libs/PCF8574/PCF8574.cpp | 13 +++++++++++++
 src/libs/PCF8574/PCF8574.h   |  1 +
 2 files changed, 14 insertions(+)

diff --git a/src/libs/PCF8574/PCF8574.cpp b/src/libs/PCF8574/PCF8574.cpp
index d211033..25bf2c2 100644
--- a/src/libs/PCF8574/PCF8574.cpp
+++ b/src/libs/PCF8574/PCF8574.cpp
@@ -51,6 +51,19 @@ void PCF8574::digitalWrite(Pin pin, boolean mode)
   _twc.endTransmission();
 }
 
+void PCF8574::togglePin(Pin pin)
+{
+	//We first check that the pin is an output
+  if((_pddr & pin) == 0)
+    return;
+
+  _pinConfig = (_pinConfig & pin) == 0 ? _pinConfig | pin : _pinConfig & ~pin;
+	
+  _twc.beginTransmission(_address);
+  _twc.write(_pinConfig);
+  _twc.endTransmission();
+}
+
 boolean PCF8574::digitalRead(Pin pin)
 {
   uint8_t reg = 0b00000000;
diff --git a/src/libs/PCF8574/PCF8574.h b/src/libs/PCF8574/PCF8574.h
index ae0ce41..eecd626 100644
--- a/src/libs/PCF8574/PCF8574.h
+++ b/src/libs/PCF8574/PCF8574.h
@@ -22,6 +22,7 @@ class PCF8574
 	void digitalReadAll(boolean array[]);
 	boolean getPinMode(Pin pin);
 	void getPinModeAll(boolean array[]);
+	void togglePin(Pin pin);
   private:
     TwoWire &_twc;
     uint8_t _address;