AT91C_BASE_PIOA->PIO_PER = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_ODR = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_IFER = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_CODR = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_IER = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_MDDR = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_PPUER = (0x1F <<21);
        AT91C_BASE_PIOA->PIO_OWDR = (0x1F <<21);
        //LEDS
        AT91C_BASE_PIOB->PIO_PER = (0xF<<19);
        AT91C_BASE_PIOB->PIO_OER = (0xF<<19);
        AT91C_BASE_PIOB->PIO_IFDR = (0xF<<19);
        AT91C_BASE_PIOB->PIO_SODR = (0xF<<19);
        AT91C_BASE_PIOB->PIO_IDR = (0xF<<19);
        AT91C_BASE_PIOB->PIO_MDDR = (0xF<<19);
        AT91C_BASE_PIOB->PIO_PPUDR = (0xF<<19);
        AT91C_BASE_PIOB->PIO_OWDR = (0xF<<19);
        //interrupts
        AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOA;
        AT91F_AIC_ConfigureIt(AT91C_ID_PIOA, BUTT_INT_LEVEL_PRIORITY, AT91C_AIC_SRCTYPE_EXT_NEGATIVE_EDGE, ( void (*)( void ) ) ButtonsISR_Test );
        AT91C_BASE_AIC->AIC_IMR = 1 << AT91C_ID_PIOA;
        AT91C_BASE_AIC->AIC_IECR = 1 << AT91C_ID_PIOA;

void __attribute__((interrupt("IRQ"), naked )) ButtonsISR_Test()
{
    AT91C_BASE_PIOB->PIO_CODR = (0x1<<19);
}

#define AT91F_AIC_ConfigureIt( irq_id, priority, src_type, newHandler )        \
{                                                                            \
    unsigned int mask;                                                        \
                                                                            \
    mask = 0x1 << irq_id;                                                    \
    /* Disable the interrupt on the interrupt controller */                    \
    AT91C_BASE_AIC->AIC_IDCR = mask;                                        \
    /* Save the interrupt handler routine pointer and the interrupt priority */    \
    AT91C_BASE_AIC->AIC_SVR[irq_id] = (unsigned int) newHandler;            \
    /* Store the Source Mode Register */                                    \
    AT91C_BASE_AIC->AIC_SMR[irq_id] = src_type | priority ;                \
    /* Clear the interrupt on the interrupt controller */                    \
    AT91C_BASE_AIC->AIC_ICCR = mask;                                        \
}