Fix the SDA SCL type #58 and add basic support for SAMD device.

PCF8574.cpp

@@ -53,7 +53,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	_usingInterrupt = true;
 };
 
-#if !defined(__AVR) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -185,8 +185,10 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
  */
 bool PCF8574::begin(){
 	this->transmissionStatus = 4;
-	#if !defined(__AVR) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
+	#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
-		_wire->begin(_sda, _scl);
+		DEBUG_PRINT(F("begin(sda, scl) -> "));DEBUG_PRINT(_sda);DEBUG_PRINT(F(" "));DEBUG_PRINTLN(_scl);
+//		_wire->begin(_sda, _scl);
+		_wire->begin((int)_sda, (int)_scl);
 	#else
 	//			Default pin for AVR some problem on software emulation
 	//			#define SCL_PIN _scl

PCF8574.h

@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.1
+ * VERSION: 2.3.2
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *
@@ -47,7 +47,7 @@
 #define DEFAULT_SCL SCL;
 
 // Uncomment to enable printing out nice debug messages.
- // #define PCF8574_DEBUG
+//  #define PCF8574_DEBUG
 
 // Uncomment for low memory usage this prevent use of complex DigitalInput structure and free 7byte of memory
 // #define PCF8574_LOW_MEMORY
@@ -109,7 +109,7 @@ public:
 	PCF8574(uint8_t address);
 	PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
 
-#if !defined(__AVR) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
 	PCF8574(uint8_t address, uint8_t sda, uint8_t scl);
 	PCF8574(uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
@@ -193,6 +193,8 @@ public:
 	}
 
 	bool isLastTransmissionSuccess(){
+		DEBUG_PRINT(F("STATUS --> "));
+		DEBUG_PRINTLN(transmissionStatus);
 		return transmissionStatus==0;
 	}
 private:

PCF8574_library.h

@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.1
+ * VERSION: 2.3.2
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *

README.md

@@ -29,6 +29,7 @@ Tutorial:
 To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder PCF8574. Check that the PCF8574 folder contains `PCF8574\\.cpp` and `PCF8574.h`. Place the DHT library folder your `<arduinosketchfolder>/libraries/` folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
 
 ## Changelog
+28/07/2022: v2.3.2 Fix the SDA SCL type #58 and add basic support for SAMD device.
 26/04/2022: v2.3.1 Fix example for esp32 and double begin issue #56.
 06/04/2022: v2.3.0 Fix package size
 30/12/2021: v2.2.4 Minor fix and remove deprecated declaration

library.json

@@ -0,0 +1,24 @@
+{
+  "name": "PCF8574 library",
+  "version": "2.3.2",
+  "keywords": "digital, i2c, encoder, expander, pcf8574, pcf8574a, esp32, esp8266, stm32, SAMD, Arduino, wire",
+  "description": "i2c digital expander for Arduino, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.",
+  "homepage": "https://www.mischianti.org/category/my-libraries/pcf8574/",
+  "authors":
+  [
+    {
+      "name": "Renzo Mischianti",
+      "email": "renzo.mischianti@gmail.com",
+      "maintainer": true,
+      "url": "https://www.mischianti.org"
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/xreef/PCF8574_library"
+  },
+  "license": "MIT",
+  "frameworks": "arduino",
+  "platforms": "*",
+  "headers": ["PCF8574.h, PCF8574_library.h"]
+}

library.properties

@@ -1,5 +1,5 @@
 name=PCF8574 library
-version=2.3.1
+version=2.3.2
 author=Renzo Mischianti <renzo.mischianti@gmail.com>
 maintainer=Renzo Mischianti <renzo.mischianti@gmail.com>
 sentence=PCF8574, library for Arduino, ESP8266, smt32 and esp32