#include <avr/io.h>

// needed for making the code readable
#define setBit(target,bitnumber)    (target|=(1<<bitnumber))
#define delBit(target,bitnumber)    (target&=(~(1<<bitnumber)))

#define isSet(port, pin)            ((port&(1 << pin)) == (1 << pin))
#define isNotSet(port, pin)         ((port&(1 << pin)) == 0)

#define configureAsOutput(target,bitnumber)   (setBit(target,bitnumber))
#define configureAsInput(target,bitnumber)    (delBit(target,bitnumber))

#define switchHigh(target,bitnumber)   (setBit(target,bitnumber))
#define switchLow(target,bitnumber)    (delBit(target,bitnumber))

#define switchLedOn(target,bitnumber)    (delBit(target,bitnumber))
#define switchLedOff(target,bitnumber)   (setBit(target,bitnumber))

#define isSwitchPressed(target,bitnumber)    (isNotSet(target,bitnumber))
#define isSwitchNotPressed(target,bitnumber)   (isSet(target,bitnumber))

#define isLow(port, pin)            (isSet(port,pin))
#define isHigh(port, pin)           (isNotSet(port,pin))

#define abs(x) ((x < 0) ? (-x) : (x))