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/).

Author: xreef

PCF8574.cpp

@@ -53,7 +53,7 @@ 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(ARDUINO_ARCH_STM32) && !defined(TEENSYDUINO)
 	/**
 	 * Constructor
 	 * @param address: i2c 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)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -115,7 +115,8 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 		_interruptFunction = interruptFunction;
 		_usingInterrupt = true;
 	};
-
+#endif
+#if defined(ESP32)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -185,10 +186,14 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
  */
 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(ARDUINO_ARCH_STM32) && !defined(TEENSYDUINO)
 		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);
+#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: 2.3.3
+ * VERSION: 2.3.4
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *
@@ -109,17 +109,18 @@ class PCF8574 {
 	PCF8574(uint8_t address);
 	PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
 
-#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(ARDUINO_ARCH_STM32) && !defined(TEENSYDUINO)
 	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)
 	///// changes for second i2c bus
 	PCF8574(TwoWire *pWire, uint8_t address);
-	PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl);
-
 	PCF8574(TwoWire *pWire, uint8_t address, 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
 
@@ -201,7 +202,7 @@ class PCF8574 {
 	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 +213,7 @@ class PCF8574 {
 	#  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

PCF8574_library.h

@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.3
+ * VERSION: 2.3.4
  *
  * 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
+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.

library.json

@@ -1,8 +1,8 @@
 {
   "name": "PCF8574 library",
-  "version": "2.3.3",
+  "version": "2.3.4",
   "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.",
+  "description": "Most starred PCF8574 library. 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":
   [

library.properties

@@ -1,9 +1,9 @@
 name=PCF8574 library
-version=2.3.3
+version=2.3.4
 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.
+sentence=Most starred PCF8574 library for Arduino (standard and SAMD), ESP8266, smt32 and esp32  
+paragraph=Most starred PCF8574 library. i2c digital expander for Arduino (standard and SAMD), esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.
 category=Sensors
 url=https://www.mischianti.org/category/my-libraries/pcf8574/
 repository=https://github.com/xreef/PCF8574_library