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Keil programming for interrupts

Hi everyone,

I dont know what should I do to let the keil compiler know refer to which function when interrupt occur. I know interrupt functions are followed with _irq prefix but there may be several of these functions!

Parents

0 John Linq over 10 years ago in reply to Westonsupermare Pier

For Example:

/******************************************************************************
** Function name:               install_irq
**
** Descriptions:                Install interrupt handler
** parameters:                  Interrupt number, interrupt handler address,
**                                              interrupt priority
** Returned value:              true or false, return false if IntNum is out of range
**
******************************************************************************/
DWORD install_irq( DWORD IntNumber, void *HandlerAddr, DWORD Priority )
{
    DWORD *vect_addr;
    DWORD *vect_prio;

    VICIntEnClr = 1 << IntNumber; /* Disable Interrupt */
    if ( IntNumber >= VIC_SIZE )
    {
                return ( FALSE );
    }
    else
    {
                /* find first un-assigned VIC address for the handler */
                vect_addr = (DWORD *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + IntNumber*4);
                vect_prio = (DWORD *)(VIC_BASE_ADDR + VECT_PRIO_INDEX + IntNumber*4);
                *vect_addr = (DWORD)HandlerAddr;        /* set interrupt vector */
                *vect_prio = Priority;
                VICIntEnable = 1 << IntNumber;    /* Enable Interrupt */
                return( TRUE );
    }

/******************************************************************************
** Function name:               init_timer
**
** Descriptions:                Initialize timer, set timer interval, reset timer,
**                                              install timer interrupt handler
**
** parameters:                  timer number and timer interval
** Returned value:              true or false, if the interrupt handler can't be
**                                              installed, return false.
**
******************************************************************************/
DWORD init_timer ( BYTE timer_num, DWORD TimerInterval )
{
  if ( timer_num == 0 )
  {
        timer0_counter = 0;
        T0MR0 = TimerInterval;
        T0MCR = 3;                              /* Interrupt and Reset on MR0 */
#if FIQ
        /* FIQ is always installed. */
        VICIntSelect |= (0x1<<4);
        VICIntEnable = (0x1<<4);
        return (TRUE);
#else
        if ( install_irq( TIMER0_INT, (void *)Timer0Handler, HIGHEST_PRIORITY ) == FALSE )
        {
          return (FALSE);
        }
        else
        {
          return (TRUE);
        }
#endif
  }
  else if ( timer_num == 1 )
  {
        timer1_counter = 0;
        T1MR0 = TimerInterval;
        T1MCR = 3;                              /* Interrupt and Reset on MR1 */
#if FIQ
        VICIntSelect |= (0x1<<5);
        VICIntEnable = (0x1<<5);
        return (TRUE);
#else
        if ( install_irq( TIMER1_INT, (void *)Timer1Handler, HIGHEST_PRIORITY ) == FALSE )
        {
          return (FALSE);
        }
        else
        {
          return (TRUE);
        }
#endif
  }
  return (FALSE);
}

Reply

0 John Linq over 10 years ago in reply to Westonsupermare Pier

For Example:

/******************************************************************************
** Function name:               install_irq
**
** Descriptions:                Install interrupt handler
** parameters:                  Interrupt number, interrupt handler address,
**                                              interrupt priority
** Returned value:              true or false, return false if IntNum is out of range
**
******************************************************************************/
DWORD install_irq( DWORD IntNumber, void *HandlerAddr, DWORD Priority )
{
    DWORD *vect_addr;
    DWORD *vect_prio;

    VICIntEnClr = 1 << IntNumber; /* Disable Interrupt */
    if ( IntNumber >= VIC_SIZE )
    {
                return ( FALSE );
    }
    else
    {
                /* find first un-assigned VIC address for the handler */
                vect_addr = (DWORD *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + IntNumber*4);
                vect_prio = (DWORD *)(VIC_BASE_ADDR + VECT_PRIO_INDEX + IntNumber*4);
                *vect_addr = (DWORD)HandlerAddr;        /* set interrupt vector */
                *vect_prio = Priority;
                VICIntEnable = 1 << IntNumber;    /* Enable Interrupt */
                return( TRUE );
    }

/******************************************************************************
** Function name:               init_timer
**
** Descriptions:                Initialize timer, set timer interval, reset timer,
**                                              install timer interrupt handler
**
** parameters:                  timer number and timer interval
** Returned value:              true or false, if the interrupt handler can't be
**                                              installed, return false.
**
******************************************************************************/
DWORD init_timer ( BYTE timer_num, DWORD TimerInterval )
{
  if ( timer_num == 0 )
  {
        timer0_counter = 0;
        T0MR0 = TimerInterval;
        T0MCR = 3;                              /* Interrupt and Reset on MR0 */
#if FIQ
        /* FIQ is always installed. */
        VICIntSelect |= (0x1<<4);
        VICIntEnable = (0x1<<4);
        return (TRUE);
#else
        if ( install_irq( TIMER0_INT, (void *)Timer0Handler, HIGHEST_PRIORITY ) == FALSE )
        {
          return (FALSE);
        }
        else
        {
          return (TRUE);
        }
#endif
  }
  else if ( timer_num == 1 )
  {
        timer1_counter = 0;
        T1MR0 = TimerInterval;
        T1MCR = 3;                              /* Interrupt and Reset on MR1 */
#if FIQ
        VICIntSelect |= (0x1<<5);
        VICIntEnable = (0x1<<5);
        return (TRUE);
#else
        if ( install_irq( TIMER1_INT, (void *)Timer1Handler, HIGHEST_PRIORITY ) == FALSE )
        {
          return (FALSE);
        }
        else
        {
          return (TRUE);
        }
#endif
  }
  return (FALSE);
}

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