How to determine which vector caused the interrupt?

WOLF — Thu, 21 Feb 2008 02:54:28 GMT

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

Re: How to determine which vector caused the interrupt?

stzari — Thu, 21 Feb 2008 20:26:19 GMT

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

Re: How to determine which vector caused the interrupt?

Arev — Thu, 21 Feb 2008 22:00:14 GMT

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 >>

Re: How to determine which vector caused the interrupt?

WOLF — Fri, 22 Feb 2008 05:31:22 GMT

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

topic Re: How to determine which vector caused the interrupt? in ColdFire/68K Microcontrollers and Processors

How to determine which vector caused the interrupt?

Re: How to determine which vector caused the interrupt?

Re: How to determine which vector caused the interrupt?

Re: How to determine which vector caused the interrupt?