main.c

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/***********************************************************************
 file ID                    	:main.c
 Version Number           	:
 Project Code                	:
 Project Name               	:
 Architect    			:ProjectLeader
 Designer     			:
 Author                     	:  
 Date of last updation     	:02-04-2009
 Description             	: 

************************************************************************/
#include "CDAC_uart_tr.h" 


static void joystick_init();                       //intialize the joy stic pins and interrupts .
static void joystic_handler( void );


void  main (void)
{
  int i = 0,j=0 ,count = 65 ;
  init_all();
   joystick_init();
  for(;;)
  {
      for( i = 0 ; i < 3000 ; i ++ )           //just for a delay .
        for( j = 0 ; j < 700 ; j++ );
      if( count != 96 )
            UART_WrByte((char )count++);
      else{
          count = 65;
          UART_WrByte('\n');
          UART_WrByte('\r');
       }
  }
}
/*----------------------------------------------------------------------*/
static void joystick_init()         
{
    //----------------PIOA initialition.
    AT91C_BASE_PMC->PMC_PCER |=   0x1 << AT91C_ID_PIOA;  //Enable peripheral clock              
    AT91C_BASE_PIOA->PIO_PER |=   0x03E00000;            //Pioa Enable Register ;Enable PIOA TO CONTROL  PINs                      
    AT91C_BASE_PIOA->PIO_ODR |=   0x03E00000;            //Output Disale Register ;Output Disabled ,made input pins   
    AT91C_BASE_PIOA->PIO_PPUER |= 0x03E00000;            //pull up P25,p21,p22,p23,p24 .
    AT91C_BASE_PIOA->PIO_IER |=   0x03E00000;            //Enable Joystick PUSH pins interrupt  
      //-------------AIC initialition.
      AT91C_BASE_AIC->AIC_IDCR |= 0X00000004 ;                        //disabling interrupts .
      AT91C_BASE_AIC->AIC_SVR[(CPU_INT32U)2] = (CPU_INT32U)joystic_handler;     //passing the handler address.
      AT91C_BASE_AIC->AIC_SMR[(CPU_INT32U)2] = 0X00000027;                      // +VE EDGE TRIGGER AND PRIORITY 7 (ITS given highets priority).
      AT91C_BASE_AIC->AIC_IECR |= 0X00000004;                         //Enable interrupts .  02
}
/*-----------------------------------------------------------------------*/
static void joystic_handler( void )
{             
   CPU_INT32U irq_id,temp;
   
       
   AT91C_BASE_AIC->AIC_IVR = 0  ;                    //Write the IVR, as required TO CLEAR IT .
   irq_id  = AT91C_BASE_AIC->AIC_ISR & 0x1F;         // Retrieve the ID of the interrupting source   ( PIOA ) 
   AT91C_BASE_AIC->AIC_ICCR |=  (0x1 << irq_id);     // Clear the current interrupt ( PIOA )   
   
   temp = AT91C_BASE_PIOA->PIO_ISR ;      //reading PIO_ISR value,ISR register indicate a change since last read or reset For the joy stic
   temp++;
   UART_WrByte('&'); 
   UART_WrByte('\n'); 
 //---------------------------------------------------------------------------------------------------------------  
   AT91C_BASE_AIC->AIC_ICCR |= 0X00000004;         //Clear all interrupts from PIOA.
  
}//end of ISR.