pin.h

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#ifndef LIBPROPELLER_PIN_H_
#define LIBPROPELLER_PIN_H_

// Comment out one definition of INLINE.
#define INLINE __attribute__((always_inline)) inline 
//#define INLINE inline

#include <propeller.h>

class Pin {
public:
    Pin();


    Pin(int pin);

    int getPin(void);


    void high(void);

    void low(void);

    void toggle(void);

    int input(void);

    void output(int setting);

    bool isOutput(void);

    

    void pwm(const int decihz, const bool useCTRA = true, Pin * alternatePin = NULL) {
        
        low();
        
        const int frq = (decihz * (((1 << 30) / CLKFREQ) << 2)) / 10;
        int ctr = (0b00101000 << 23) + pinNumber;
        
        if(alternatePin != NULL){
            ctr +=  alternatePin->getPin() << 9;
            alternatePin->setOutput();
            alternatePin->low();
        }
        
        
        if(decihz == 0){
            ctr = 0;
        }
        
        if (useCTRA) {
            FRQA = frq;
            CTRA = ctr;
        } else {
            FRQB = frq;
            CTRB = ctr;
        }
        
        setOutput();
    }


private:
    unsigned int pin_mask;
    int pinNumber;
    void setOutput();
};

INLINE Pin::Pin() : pin_mask(0) {
    pinNumber = -1;
}

INLINE Pin::Pin(int pin) : pin_mask(1 << pin) {
    pinNumber = pin;
}

INLINE int Pin::getPin(void) {
    return pinNumber;
}

INLINE void Pin::high() {
    OUTA |= pin_mask;
    setOutput();
}

INLINE void Pin::low() {
    OUTA &= ~pin_mask;
    setOutput();
}

INLINE void Pin::toggle() {
    OUTA ^= pin_mask;
    setOutput();
}

INLINE void Pin::output(int setting) {
    if (setting == 1)
        high();
    else
        low();
}

INLINE bool Pin::isOutput() {
    return (DIRA & pin_mask) ? true : false;
}

INLINE int Pin::input() {
    DIRA &= ~pin_mask;
    return (INA & pin_mask) != 0;
}

INLINE void Pin::setOutput() {
    DIRA |= pin_mask;
}


#endif // LIBPROPELLER_PIN_H_