- 01/02/2024: v2.3.7 Add the possibility to insert address at begin()

PCF8575.cpp

@@ -154,10 +154,18 @@ PCF8575::PCF8575(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	};
 #endif
 
+bool PCF8575::begin(uint8_t address){
+	_address = address;
+	return PCF8575::begin();
+}
+
+
 /**
  * wake up i2c controller
  */
-void PCF8575::begin(){
+bool PCF8575::begin(){
+	this->transmissionStatus = 4;
+
 #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);
@@ -196,7 +204,7 @@ void PCF8575::begin(){
 		_wire->write((uint8_t) (~(usedPin >> 8)));
 
 		DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
-		_wire->endTransmission();
+		this->transmissionStatus = _wire->endTransmission();
 	}
 
 	// If using interrupt set interrupt value to pin
@@ -208,6 +216,8 @@ void PCF8575::begin(){
 
 	// inizialize last read
 	lastReadMillis = millis();
+
+	return this->isLastTransmissionSuccess();
 }
 
 /**

PCF8575.h

@@ -132,7 +132,8 @@ class PCF8575 {
 	PCF8575(TwoWire *pWire, uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
-	void begin();
+	bool begin();
+	bool begin(uint8_t address);
 	void pinMode(uint8_t pin, uint8_t mode);
 
 	void readBuffer(bool force = true);
@@ -182,6 +183,11 @@ class PCF8575 {
 		uint16_t digitalReadAll(void);
 	#endif
 	void digitalWrite(uint8_t pin, uint8_t value);
+	bool isLastTransmissionSuccess(){
+		DEBUG_PRINT(F("STATUS --> "));
+		DEBUG_PRINTLN(transmissionStatus);
+		return transmissionStatus==0;
+	}
 
 private:
 	uint8_t _address;
@@ -225,6 +231,9 @@ class PCF8575 {
 
 	uint16_t writeByteBuffered = 0;
 
+	uint8_t transmissionStatus = 0;
+
+
 };
 
 #endif

README.md

@@ -15,6 +15,7 @@
 
 Library to use i2c analog IC with arduino and esp8266. Can read and write digital value with only 2 wire (perfect for ESP-01).
 
+ - 01/02/2024: v1.1.2 Add the possibility to insert address at begin() function and return status of begin operation
  - 10/07/2023: v1.1.1 Add support for Arduino UNO R4
  - 16/02/2023: v1.1.0 
     - Fix STM32 support and add support for Raspberry Pi Pico and other rp2040 boards

library.json

@@ -1,6 +1,6 @@
 {
   "name": "PCF8575 library",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "keywords": "digital, i2c, encoder, expander, pcf8575, pcf8575a, esp32, esp8266, stm32, SAMD, Arduino, wire, Raspberry, rp2040",
   "description": "PCF8575 library. i2c digital expander for 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/2019/07/22/pcf8575-i2c-16-bit-digital-i-o-expander/",

library.properties

@@ -1,5 +1,5 @@
 name=PCF8575 library
-version=1.1.1
+version=1.1.2
 author=Renzo Mischianti <[email protected]>
 maintainer=Renzo Mischianti <[email protected]>
 sentence=PCF8575, library for Arduino, Raspberry Pi Pico and rp2040 boards, esp32, SMT32 and ESP8266.