pio_example2_dip_switch_lights.c

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#include <avr32/morgan.h>
#include <avr32/pio.h>

/* colors */
#define black 0x00
#define red 0x01
#define green 0x04
#define yellow 0x05
#define blue 0x10
#define purple 0x11
#define light_blue 0x14
#define white 0x15

char color_array[8]={black,purple,blue,light_blue,green,yellow,red,white};

#define INPUT_BITMASK   0x0000ff00
#define OUTPUT_BITMASK  0x000000ff

int main( void )
{
  avr32_pio_t *piob = (void *) AVR32_PIOB;
  char input, output;

  /* SET PIO */
  piob->pdr = 0x00000000; /* Enable entire PORTB for PIO controlled operation */
  piob->oer = OUTPUT_BITMASK; /* Use PORTB[15..8] as output */
  piob->odr = INPUT_BITMASK; /* Use PORTB[7..0] as input */
  piob->ifer = INPUT_BITMASK; /*Glitch enable on input */
  piob->codr = 0xFFFFffff; /* Clear all appropriate pins */

  while(1){
        /* read input and output */
        input = (~(piob->pdsr >> 8) & OUTPUT_BITMASK);
    output = (piob->pdsr) & OUTPUT_BITMASK;

        /* check if a change has occured */
    if( input != output){
                /* Clear the output data */
                piob->codr = OUTPUT_BITMASK;
                /* Set output data according to the input */
                piob->sodr = input;
    } //if
  }//while
}//main

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