Port Pin und Tabelle

#include <avr/io.h>

enum REGNO { REG_IN, REG_DIR, REG_OUT };

enum ACTION { PIN_READ, PIN_SET, PIN_CLEAR };

volatile uint8_t *ports[] = { &PINA, &PINB, &PINC, &PIND, &PINE, 

                              &PINF, &PING, &PINH, &PINJ, &PINK, &PINL };

uint8_t bitmask[] = { 1, 2, 4, 8, 16, 32, 64, 128 };

int8_t debugport( uint8_t portno, uint8_t regno, uint8_t bitno, uint8_t action )

{

  uint8_t mask = bitmask[bitno];

  volatile uint8_t *ptr = ports[portno];

  if( portno >= sizeof(ports) / 2 )

    return -1;

  if( ptr == 0 )

    return -1;

  if( bitno >= 8 )

    return -1;

  if( regno >= REG_OUT )

    return -1;

  ptr += regno;

  switch( action ){

    case PIN_READ:  return !!(*ptr & mask);     // 0 or 1

    case PIN_SET:   *ptr |=  mask; return 0;    // 0 = success

    case PIN_CLEAR: *ptr &= ~mask; return 0;

  }

  return -1;                                    // -1 = error

}