#define AIC_SMR(n) (*(&AIC_SMR0 + n))
#define AIC_SVR(n) (*(&AIC_SVR0 + n))
#define AIC_SRCTYPE_INT_LEVEL_SENSITIVE 0x00    /* Level Sensitive */
#define AIC_SRCTYPE_INT_EDGE_TRIGGERED  0x20    /* Edge Triggered */
#define AIC_SRCTYPE_EXT_LOW_LEVEL       0x00    /* Low Level */
#define AIC_SRCTYPE_EXT_NEGATIVE_EDGE   0x20    /* Negative Edge */
#define AIC_SRCTYPE_EXT_HIGH_LEVEL      0x40    /* High Level */
#define AIC_SRCTYPE_EXT_POSITIVE_EDGE   0x60    /* Positive Edge */
#define US0_ID 6

void uart0_irq(void) __attribute__ ((interrupt("IRQ")));
void uart0_irq(void)
{
  
//  PIOA_CODR = 0x01;
//  delaym(100000);
//  PIOA_SODR = 0x01;
  int act=uart_get_sc(), i;
  for (i=0;i<6;i++)
  {
    prev_active[i]=active[i];
    active[i]=(act>>i) & 0x1;
  }
  AIC_EOICR = 0;
}

в мэйне:
AIC_IDCR = 1 << 6;
  AIC_SVR(6) = (unsigned)uart0_irq;
  AIC_SMR(6) = 0x00;//AIC_SRCTYPE_INT_EDGE_TRIGGERED;
  AIC_ICCR = 1 << 6;
  AIC_IECR = 1 << 6;
__ARMLIB_enableIRQ();

  AIC_IDCR = 1 << 6;
  AIC_SVR(6) = (unsigned)uart0_irq;
  AIC_SMR(6) = 0;//AIC_SRCTYPE_INT_EDGE_TRIGGERED;
  AIC_ICCR = 1 << 6;
  AIC_IECR = 1 << 6;
  US0_IER = 0x1;
__ARMLIB_enableIRQ();