9S12x Interrupt vector address in .prm file or in code?

jcdammeyer — Fri, 23 May 2014 19:02:20 GMT

I've done several projects on the 9S12XDP512 and in each case I've used the .prm file to specify the names of the interrupt handling functions.

/* use these definitions in plane of the vector table ('vectors') above */

VECTOR 0 _Startup /* reset vector: this is the default entry point for a C/C++ application. */

//VECTOR 0 Entry /* reset vector: this is the default entry point for an Assembly application. */

//INIT Entry /* for assembly applications: that this is as well the initialization entry point */

VECTOR ADDRESS 0xFF78 PIT1_ISR

VECTOR ADDRESS 0xFF7A PIT0_ISR

VECTOR ADDRESS 0xFFD6 COM1Interrupt

VECTOR ADDRESS 0xFFD4 COM2Interrupt

This is all based on the original example code from the Softec Development board I started with.

The linker fills in the rest of the table with FFFF so a spurious interrupt should reset the application since the entry at that RESET vector is 0xC000.

Is there a better way to do this or should I care?

In the timer.c file I have:

#pragma CODE_SEG __NEAR_SEG NON_BANKED

interrupt void PIT0_ISR(void) {

TickCount++;

	PITTF = 0x01;
}

#pragma CODE_SEG DEFAULT

In order to access the variable TickCount I disable interrupts since TickCount is a 16 bit variable and could change between reading it and clearing it.

// disable timer interrupts

PITINTE &= DELAY_TIMER_DISABLE;

// Update local copy.

t_Delay = TickCount;

TickCount = 0;

// re-enable timer interrupts

PITINTE |= DELAY_TIMER_ENABLE;

Any comments on the above. Is there anything unique in the 9S12 family that I'm missing here? Specifically when I see the comments in the .prm file about OSEK etc.

ENTRIES /* keep the following unreferenced variables */

/* OSEK: always allocate the vector table and all dependent objects */

//_vectab OsBuildNumber _OsOrtiStackStart _OsOrtiStart

END

Thanks

John

Re: 9S12x Interrupt vector address in .prm file or in code?

ZhangJennie — Tue, 03 Jun 2014 07:20:24 GMT

hi John. !

the interrupt vector address is correct in your code.

please perform interrupt per attached technical note.

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Best Regards,

ZhangJun

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9S12x Interrupt vector address in .prm file or in code?

Re: 9S12x Interrupt vector address in .prm file or in code?