xtest08_3.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*	     Xtest08_3.c : PIO Interrupt Program by KEY1 & KEY2		      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"

void PIO_ISR(void)				/* PIO interrupt service routine */
{ unsigned int i, status;

  status = (AT91F_PIO_GetInterruptStatus(AT91C_BASE_PIOA) >> 7) & 0x00000003;
  if(status == 1)				// if KEY1, blink LED1 by 3 times
    { LCD_string(0xC0,"    by KEY1     ");
      for(i=1; i<=3; i++)
        { LED_on(LED1);
          Delay_ms(300);
          LED_off(LED1);
          Delay_ms(300);
        }
    }
  else if(status == 2)				// if KEY2, blink LED2 by 3 times
    { LCD_string(0xC0,"    by KEY2     ");
      for(i=1; i<=3; i++)
        { LED_on(LED2);
          Delay_ms(300);
          LED_off(LED2);
          Delay_ms(300);
        }
    }
}

int main(void)
{
  MCU_initialize();				// initialize AT91SAM7S256 & kit
  Delay_ms(50);					// wait for system stabilization
  LCD_initialize();				// initialize text LCD

  LCD_string(0x80," PIO Interrupt  ");		// display title on text LCD
  LCD_string(0xC0,"                ");
  Beep();

  AT91F_PIO_InputFilterEnable(AT91C_BASE_PIOA,KEY2|KEY1); // initialize PIO interrupt
  AT91F_PIO_InterruptEnable(AT91C_BASE_PIOA,KEY2|KEY1);
  AT91F_AIC_ConfigureIt(AT91C_BASE_AIC,AT91C_ID_PIOA,7,1,PIO_ISR);
  AT91F_AIC_EnableIt(AT91C_BASE_AIC,AT91C_ID_PIOA);
  
  while(1);					// wait for interrupts
}