I2C address checks cleaned up

IODevice.cpp

@@ -61,14 +61,11 @@ void IODevice::begin() {
   // Allocates 32 pins 100-131
   PCA9685::create(100, 16, 0x40);
   PCA9685::create(116, 16, 0x41);
-  PCA9685::create(132, 16, 0x41);  // should fail
-  PCA9685::create(118, 4, 0x42);  // should fail
   
   // Predefine two MCP23017 module 0x20/0x21
   // Allocates 32 pins 164-195
   MCP23017::create(164, 16, 0x20);
   MCP23017::create(180, 16, 0x21);
-MCP23017::create(196, 16, 0x40);  // should fail
 
   // Call the begin() methods of each configured device in turn
   for (IODevice *dev=_firstDevice; dev!=NULL; dev = dev->_nextDevice) {
@@ -280,7 +277,9 @@ IODevice *IODevice::findDevice(VPIN vpin) {
 // Private helper function to check for vpin overlap. Run during setup only.
 // returns true if pins DONT overlap with existing device
 bool IODevice::checkNoOverlap(VPIN firstPin, uint8_t nPins, uint8_t i2cAddress) {
+#ifdef DIAG_IO
   DIAG(F("Check no overlap %d %d 0x%x"), firstPin,nPins,i2cAddress);
+#endif
   VPIN lastPin=firstPin+nPins-1;
   for (IODevice *dev = _firstDevice; dev != 0; dev = dev->_nextDevice) {
     
@@ -303,10 +302,8 @@ bool IODevice::checkNoOverlap(VPIN firstPin, uint8_t nPins, uint8_t i2cAddress)
   return true;  // no overlaps... OK to go on with constructor
 }
   
- bool IODevice::_matchI2CAddress(uint8_t i2cAddress) { 
-   // Overridden for I2c devices. 
-   (void) i2cAddress;
-   return false;
+bool IODevice::_matchI2CAddress(uint8_t i2cAddress)  {
+    return (i2cAddress && i2cAddress==_I2CAddress);
   }
 
 //==================================================================================================================

IODevice.h

@@ -168,6 +168,7 @@ protected:
     _firstVpin = firstVpin;
     _nPins = nPins;
     _nextEntryTime = 0;
+    _I2CAddress=0;
   }
 
  // Method to perform initialisation of the device (optionally implemented within device class)
@@ -220,7 +221,7 @@ protected:
   // Common object fields.
   VPIN _firstVpin;
   int _nPins;
-
+  uint8_t _I2CAddress;
   // Flag whether the device supports callbacks.
   bool _hasCallback = false;
 
@@ -229,7 +230,7 @@ protected:
   int16_t _gpioInterruptPin = -1;
 
   // non-i2c hal drivers return false, i2c drivers override this in IO_GPIOBase
-  virtual bool _matchI2CAddress(uint8_t i2cAddress);
+  bool _matchI2CAddress(uint8_t i2cAddress);
     
   // Method to check if pins will overlap before creating new device. 
   static bool checkNoOverlap(VPIN firstPin, uint8_t nPins=1, uint8_t i2cAddress=0);
@@ -245,7 +246,6 @@ private:
   bool owns(VPIN vpin);
   // Method to find device handling Vpin
   static IODevice *findDevice(VPIN vpin);
-  uint8_t _I2CAddress;
   IODevice *_nextDevice = 0;
   unsigned long _nextEntryTime;
   static IODevice *_firstDevice;
@@ -287,10 +287,7 @@ private:
   void updatePosition(uint8_t pin);
   void writeDevice(uint8_t pin, int value);
   void _display() override;
-  virtual bool _matchI2CAddress(uint8_t i2caddress) override {
-    return i2caddress && i2caddress==_I2CAddress;
-  }
-  uint8_t _I2CAddress; // 0x40-0x43 possible
+  
 
   struct ServoData {
     uint16_t activePosition : 12; // Config parameter

IO_GPIOBase.h

@@ -45,13 +45,9 @@ protected:
   int _read(VPIN vpin) override;
   void _display() override;
   void _loop(unsigned long currentMicros) override;
-  virtual bool _matchI2CAddress(uint8_t i2cAddress) override {
-    DIAG(F("MatchI2c %x %x"), i2cAddress, _I2CAddress);
-    return (i2cAddress && i2cAddress==_I2CAddress);
-  }
 
   // Data fields
-  uint8_t _I2CAddress;
+ 
   // Allocate enough space for all input pins
   T _portInputState; 
   T _portOutputState;