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#include <AT91SAM7S32.H>
#define TCK  1000                           /* Timer Clock  */
#define PIV  ((46000000/TCK/16)-1)         /* Periodic Interval Value */
#define LED1 1<<0

__irq void tc0_int (void){                                  /* funkciya prerivaniya timera */
  AT91S_TC* pTC0 = AT91C_BASE_TC0;

  *AT91C_PIOA_ODSR ^= LED1;         /* Toggle LED1 */

  *AT91C_AIC_EOICR = pTC0->TC_SR;           /* End of Interrupt */   
}                     
                                                   
void init_tc0 (void){                                    /*funkciya nastroyki timera     */
  AT91S_TC*  pTC0 = AT91C_BASE_TC0;
  AT91S_AIC* pAIC = AT91C_BASE_AIC;

  *AT91C_PMC_PCER |= (1 << AT91C_ID_TC0);    /* Enable Clock for TC0 */

  pTC0->TC_CCR  = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
  pTC0->TC_CMR  = AT91C_TC_CLKS_TIMER_DIV4_CLOCK | AT91C_TC_CPCTRG; /* prescaler 128 */
  pTC0->TC_RC   = ((((double)(46000000/128)*TCK*100UL)/1E6)-1);   /* 100 ms        */
  pTC0->TC_IER  = AT91C_TC_CPCS;             

  /* Setup System Interrupt Mode and Vector with Priority 7 and Enable it */
  pAIC->AIC_SMR[AT91C_ID_TC0] = AT91C_AIC_SRCTYPE_INT_POSITIVE_EDGE | 0;
  pAIC->AIC_SVR[AT91C_ID_TC0] = (unsigned long) tc0_int;
  pAIC->AIC_IECR = (1 << AT91C_ID_TC0);
}