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Is it possible to use an AVR port as a variable which can be passed around? For example LED myLed(PORTA,7); //myLED hooked to PORTA, Pin 7 I would like to make LED be able to take any PORT / Pin combination, so I would rather not hard code it in. Note that the PORTs are defined as: #define PINA _SFR_IO8(0x00) #define DDRA _SFR_IO8(0x01) #define PORTA _SFR_IO8(0x02) PORTA symbol resolves to (*(volatile uint8_t *)((0x02) + 0x20)) I believe this would allow me to do something like the following, but I am unsure whether I would need the volatile keyword or not, nor whether it will actually work as expected class LED{ public: LED(volatile uint8_t* port, uint8_t pin); { Port=port; Pin=pin; } void write(bool val) { if(val) (*Port) |= 1 << Pin; else (*Port) &= ~(1 << Pin); } private: uint8_t Pin volatile uint8_t* Port; } Finally, is there a way to set Port / Pin as an Output from the LED Constructor? This would involve finding the relative DDR# register for the Given PORT#. Can I assume &DDR# will always be &PORT#-1?

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