Fix STM32 support and add support for Raspberry Pi Pico and other rp2…

…040 boards

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(ARDUINO_ARCH_STM32) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -90,7 +90,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	};
 #endif
 
-#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD)
+#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD)|| defined(ARDUINO_ARCH_RP2040)  || defined(ARDUINO_ARCH_STM32)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -186,11 +186,15 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
  */
 bool PCF8574::begin(){
 	this->transmissionStatus = 4;
-	#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD) && !defined(ARDUINO_ARCH_STM32) && !defined(TEENSYDUINO)
+	#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD)  && !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);
+#elif defined(ARDUINO_ARCH_RP2040)
+		_wire->setSCL(_scl);
+		_wire->setSDA(_sda);
+		_wire->begin();
 #else
 		_wire->begin((int)_sda, (int)_scl);
 #endif

PCF8574.h

@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.4
+ * VERSION: 2.3.5
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *
@@ -109,12 +109,12 @@ class PCF8574 {
 	PCF8574(uint8_t address);
 	PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
 
-#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(ARDUINO_ARCH_STM32) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO)
 	PCF8574(uint8_t address, int sda, int scl);
 	PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
-#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD)
+#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32)
 	///// changes for second i2c bus
 	PCF8574(TwoWire *pWire, uint8_t address);
 	PCF8574(TwoWire *pWire, uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );

PCF8574_library.h

@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.4
+ * VERSION: 2.3.5
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *

README.md

@@ -9,37 +9,28 @@
   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
-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.
+ - 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)
+
 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 
 

library.json

@@ -1,6 +1,6 @@
 {
   "name": "PCF8574 library",
-  "version": "2.3.4",
+  "version": "2.3.5",
   "keywords": "digital, i2c, encoder, expander, pcf8574, pcf8574a, esp32, esp8266, stm32, SAMD, Arduino, wire",
   "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/",

library.properties

@@ -1,5 +1,5 @@
 name=PCF8574 library
-version=2.3.4
+version=2.3.5
 author=Renzo Mischianti <[email protected]>
 maintainer=Renzo Mischianti <[email protected]>
 sentence=Most starred PCF8574 library for Arduino (standard and SAMD), ESP8266, smt32 and esp32