How to determine which vector caused the interrupt?

[WOLF]

I know this is not the best example but go with me on this.  If i had all vectors point to the same interrupt function. is there away inside to determine whcih vector was the cause?

thanks

[WOLF]

Thanks,    Gives me a Good start.  sample code was greaty apreciated.

[Arev]

Hello,

The Vector information is stored in the 'Exception Frame Structure'

You can use one Generic Interrupt asm Handler to save the 'Exception Frame Address' and call a C Function to manage Vector.

//---------------------------------------------------------------------------------------------------------------------------------

__interrupt__ void   ISR_Asm_User(void);

_ISR_Asm_User:

        lea     -60(SP),SP                        // Stack for 'movem'

        movem.l D0-D7/A0-A6,(SP)        // Save Registers

        pea.l   60(SP)                               // Push 'Exception Frame Address'

        jsr     _IRQ_Interruption                // Generic C Fonction IRQ_Interruption(void *ExceptionFrame)

        movem.l 4(SP),D0-D7/A0-A6       // Restore Registers

        lea     64(SP),SP                           // Restore SP

        rte

//---------------------------------------------------------------------------------------------------------------------------------

void IRQ_Interruption(void *ExceptionFrame_P)
{
register INT Vector_L;

    // Extract Vector Number
    Vector_L = MCF5XXX_RD_SF_VECTOR(ExceptionFrame_P);

    // Manage Vector

    if (Vector_L < NB_MAX_VECTORS)
    {

        if (TableIRQ_G[Vector_L].Procedure != NULL)
        {
            // Call Vector Procedure(void *Parameters) from your Own IRQ Table
            (TableIRQ_G[Vector_L].Procedure)(TableIRQ_G[Vector_L].Parameters);
        }
    }

}

//---------------------------------------------------------------------------------------------------------------------------------

I Hope this helps..

Bye

<< Freescale MCF5234/35 with CodeWarrior 6.2 >>

[stzari]

Hi Wolf,

basically it's possible. For this you would have to check the value of the exception stack frame. The  interrupt  vector is  encoded  there.
For more information see Coldfire Family Programmer's Manual  (Ch.  11)  or the  user manual of your processor.

HTH
  stzari