void send_byte(char bt)
{
while ((AT91C_BASE_US1->US_CSR & 0x00000200) == 0);
AT91C_BASE_US1->US_THR = bt;
}

void main()
{

AT91C_BASE_AIC->AIC_IECR = 0x00000003; // System interrupt enable
AT91C_BASE_AIC->AIC_IECR = 0x00000080; // USART1 interrupt enable
AT91C_BASE_AIC->AIC_IECR = 0xC0000000; // AIC interrupt enable
AT91C_BASE_AIC->AIC_SPU = 0x000000FA; // Spurious interrupt vector


AT91C_BASE_US1->US_CR = 0x00000050;
AT91C_BASE_US1->US_MR = 0x003008C0;
AT91C_BASE_US1->US_BRGR = 70;
AT91C_BASE_US1->US_IER = 0x00000008; // detailed USART1 interrupt

AT91C_BASE_AIC->AIC_SVR[1] = (unsigned int) *(_blink);
...
AT91C_BASE_AIC->AIC_SVR[32] = (unsigned int) *(_blink);



while(1)
{

send_byte('1');
send_byte('2');
send_byte('3');
send_byte(13);
}

}