Add the possibility to insert address at begin()

.project

@@ -5,7 +5,97 @@
 	<projects>
 	</projects>
 	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.cdt.make.core.makeBuilder</name>
+			<triggers>clean,full,incremental,</triggers>
+			<arguments>
+				<dictionary>
+					<key>org.eclipse.cdt.core.errorOutputParser</key>
+					<value>org.eclipse.cdt.autotools.core.ErrorParser;org.eclipse.cdt.core.GASErrorParser;org.eclipse.cdt.core.GLDErrorParser;org.eclipse.cdt.core.GCCErrorParser;org.eclipse.cdt.core.GmakeErrorParser;org.eclipse.cdt.core.VCErrorParser;org.eclipse.cdt.core.CWDLocator;org.eclipse.cdt.core.MakeErrorParser;</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.append_environment</key>
+					<value>true</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.build.arguments</key>
+					<value></value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.build.command</key>
+					<value>make</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.build.target.auto</key>
+					<value>all</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.build.target.clean</key>
+					<value>clean</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.build.target.inc</key>
+					<value>all</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.enableAutoBuild</key>
+					<value>false</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.enableCleanBuild</key>
+					<value>true</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.enableFullBuild</key>
+					<value>true</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.enabledIncrementalBuild</key>
+					<value>true</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.environment</key>
+					<value></value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.stopOnError</key>
+					<value>false</value>
+				</dictionary>
+				<dictionary>
+					<key>org.eclipse.cdt.make.core.useDefaultBuildCmd</key>
+					<value>true</value>
+				</dictionary>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.cdt.autotools.core.genmakebuilderV2</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>io.sloeber.core.inoToCpp</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.cdt.codan.core.codanBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 	</buildSpec>
 	<natures>
+		<nature>io.sloeber.arduinonature</nature>
+		<nature>org.eclipse.cdt.core.cnature</nature>
+		<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
+		<nature>org.eclipse.cdt.core.ccnature</nature>
+		<nature>org.eclipse.cdt.autotools.core.autotoolsNatureV2</nature>
+		<nature>org.eclipse.cdt.make.core.makeNature</nature>
+		<nature>org.eclipse.cdt.codan.core.codanNature</nature>
+		<nature>org.eclipse.cdt.make.core.cfgSupportNature</nature>
 	</natures>
 </projectDescription>

PCF8574.cpp

@@ -53,14 +53,14 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	_usingInterrupt = true;
 };
 
-#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
 	/**
 	 * Constructor
 	 * @param address: i2c address
 	 * @param sda: sda pin
 	 * @param scl: scl pin
 	 */
-	PCF8574::PCF8574(uint8_t address, uint8_t sda, uint8_t scl){
+	PCF8574::PCF8574(uint8_t address, int sda, int scl){
 		_wire = &Wire;
 
 		_address = address;
@@ -76,7 +76,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	 * @param interruptPin: pin to set interrupt
  	 * @param interruptFunction: function to call when interrupt raised
 	 */
-	PCF8574::PCF8574(uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)() ){
+	PCF8574::PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)() ){
 		_wire = &Wire;
 
 		_address = address;
@@ -90,7 +90,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	};
 #endif
 
-#ifdef ESP32
+#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD)|| defined(ARDUINO_ARCH_RP2040)  || defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_RENESAS)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -115,14 +115,15 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 		_interruptFunction = interruptFunction;
 		_usingInterrupt = true;
 	};
-
+#endif
+#if defined(ESP32)
 	/**
 	 * Constructor
 	 * @param address: i2c address
 	 * @param sda: sda pin
 	 * @param scl: scl pin
 	 */
-	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl){
+	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl){
 		_wire = pWire;
 
 		_address = address;
@@ -138,7 +139,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	 * @param interruptPin: pin to set interrupt
 	 * @param interruptFunction: function to call when interrupt raised
 	 */
-	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)() ){
+	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)() ){
 		_wire = pWire;
 
 		_address = address;
@@ -180,15 +181,29 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 
 	}
 
+bool PCF8574::begin(uint8_t address){
+	_address = address;
+	return PCF8574::begin();
+}
+
+
 /**
  * wake up i2c controller
  */
 bool PCF8574::begin(){
 	this->transmissionStatus = 4;
-	#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
+	#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD)  && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
 		DEBUG_PRINT(F("begin(sda, scl) -> "));DEBUG_PRINT(_sda);DEBUG_PRINT(F(" "));DEBUG_PRINTLN(_scl);
 //		_wire->begin(_sda, _scl);
+#ifdef ARDUINO_ARCH_STM32
+		_wire->begin((uint32_t)_sda, (uint32_t)_scl);
+#elif defined(ARDUINO_ARCH_RP2040)
+		_wire->setSCL(_scl);
+		_wire->setSDA(_sda);
+		_wire->begin();
+#else
 		_wire->begin((int)_sda, (int)_scl);
+#endif
 	#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: 2.3.2
+ * VERSION: 2.3.7
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *
@@ -109,21 +109,23 @@ public:
 	PCF8574(uint8_t address);
 	PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
 
-#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)());
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
+	PCF8574(uint8_t address, int sda, int scl);
+	PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
-#ifdef ESP32
+#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_RENESAS)
 	///// changes for second i2c bus
 	PCF8574(TwoWire *pWire, uint8_t address);
-	PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl);
-
 	PCF8574(TwoWire *pWire, uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
-	PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)());
+#endif
+#if defined(ESP32)
+	PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl);
+	PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
 	bool begin();
+	bool begin(uint8_t address);
 	void pinMode(uint8_t pin, uint8_t mode, uint8_t output_start = HIGH);
 
 	void encoder(uint8_t pinA, uint8_t pinB);
@@ -201,7 +203,7 @@ private:
 	uint8_t _address;
 
 	#if !defined(DEFAULT_SDA)
-	#  if defined(__STM32F1__)
+	#  if defined(ARDUINO_ARCH_STM32)
 	#    define DEFAULT_SDA PB7
 	#  elif defined(ESP8266)
 	#    define DEFAULT_SDA 4
@@ -212,7 +214,7 @@ private:
 	#  endif
 	#endif
 	#if !defined(DEFAULT_SCL)
-	#  if defined(__STM32F1__)
+	#  if defined(ARDUINO_ARCH_STM32)
 	#    define DEFAULT_SCL PB6
 	#  elif defined(ESP8266)
 	#    define DEFAULT_SCL 5
@@ -223,8 +225,8 @@ private:
 	#  endif
 	#endif
 
-	uint8_t _sda = DEFAULT_SDA;
-	uint8_t _scl = DEFAULT_SCL;
+	int _sda = DEFAULT_SDA;
+	int _scl = DEFAULT_SCL;
 
 	TwoWire *_wire;
 

PCF8574_library.h

@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.2
+ * VERSION: 2.3.7
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *

README.md

@@ -9,35 +9,30 @@
   align="right"></a>
 </div>
 
-#
-#
-#
-#
-#
 #
 
-### Additional information and documentation on my site: [pcf8574 Article](https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/).
 
-### If you need more pins [here](https://www.mischianti.org/2019/07/22/pcf8575-i2c-16-bit-digital-i-o-expander/) you can find the pcf8575 16bit version of the IC.
+# PCF8574 PCF8574AP digital input and output expander with i2c bus.
+#### Complete documentation on my site: [pcf8574 Article](https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/).
 
-### Version 2.2
-
-Library to use I2C analog IC with arduino and esp8266. Can read and write digital value with only 2 wires (perfect for ESP-01).
-
-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.
+#### If you need more pins [here](https://www.mischianti.org/2019/07/22/pcf8575-i2c-16-bit-digital-i-o-expander/) you can find the pcf8575 16bit version of the IC.
 
 ## 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
-23/11/2020: v2.2.2 Add multiple implementation for encoder management (you can enable by uncomment relative define)
+ - 01/02/2024: v2.3.7 Add the possibility to insert address at begin()
+ - 10/07/2023: v2.3.6 Support for Arduino UNO R4
+ - 08/02/2023: v2.3.5 Fix STM32 support and add support for Raspberry Pi Pico and other rp2040 boards
+ - 10/08/2022: v2.3.4 Add support for custom SERCOM interface of Arduino SAMD devices. Force SDA SCL to use GPIO numeration for STM32 bug (https://www.mischianti.org/forums/topic/compatible-with-stm32duino/). 
+ - 28/07/2022: v2.3.3 Force SDA SCL to use GPIO numeration (https://www.mischianti.org/forums/topic/cannot-set-sda-clk-on-esp8266/).
+ - 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
+ - 23/11/2020: v2.2.2 Add multiple implementation for encoder management (you can enable by uncomment relative define)
 
-# Reef complete PCF8574 PCF8574AP digital input and output expander with i2c bus.
 I try to simplify the use of this IC, with a minimal set of operations.
 
+Tested with esp8266, esp32, Arduino, Arduino SAMD (Nano 33 IoT, MKR etc.), STM32 and rp2040 (Raspberry Pi Pico and similar)
+
 PCF8574P address map 0x20-0x27 
 PCF8574AP address map 0x38-0x3f 
 

examples/ArduinoSAMDSercom3keyPressedPin1/ArduinoSAMDSercom3keyPressedPin1.ino

@@ -0,0 +1,37 @@
+/*
+ KeyPressed on PIN1
+ by Mischianti Renzo <http://www.mischianti.org>
+
+ https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
+*/
+
+#include "Arduino.h"
+#include "PCF8574.h"
+
+TwoWire aWire(&sercom3, 20, 21);
+// Set i2c address
+PCF8574 pcf8574(&aWire, 0x38);
+
+unsigned long timeElapsed;
+void setup()
+{
+	Serial.begin(115200);
+	delay(1000);
+
+	pcf8574.pinMode(P0, OUTPUT);
+	pcf8574.pinMode(P1, INPUT);
+
+	Serial.print("Init pcf8574...");
+	if (pcf8574.begin()){
+		Serial.println("OK");
+	}else{
+		Serial.println("KO");
+	}
+}
+
+void loop()
+{
+	uint8_t val = pcf8574.digitalRead(P1);
+	if (val==HIGH) Serial.println("KEY PRESSED");
+	delay(50);
+}

library.json

@@ -1,8 +1,8 @@
 {
   "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.",
+  "version": "2.3.7",
+  "keywords": "digital, i2c, encoder, expander, pcf8574, pcf8574a, esp32, esp8266, stm32, SAMD, Arduino, wire, rp2040, Raspberry",
+  "description": "Most starred PCF8574 library. i2c digital expander for Arduino, Raspberry Pi Pico and rp2040 boards, 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":
   [

library.properties

@@ -1,10 +1,10 @@
 name=PCF8574 library
-version=2.3.2
+version=2.3.7
 author=Renzo Mischianti <renzo.mischianti@gmail.com>
 maintainer=Renzo Mischianti <renzo.mischianti@gmail.com>
-sentence=PCF8574, library for Arduino, ESP8266, smt32 and esp32  
-paragraph=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.
-category=Sensors
+sentence=Most starred PCF8574 library for Arduino (standard and SAMD), Raspberry Pi Pico and rp2040 boards, ESP8266, smt32 and esp32  
+paragraph=Most starred PCF8574 library. i2c digital expander for Arduino (standard and SAMD), esp32, Raspberry Pi Pico and rp2040 boards, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.
+category=Signal Input/Output
 url=https://www.mischianti.org/category/my-libraries/pcf8574/
 repository=https://github.com/xreef/PCF8574_library
 architectures=*