MPC5746C breakpoint in the Interrupt Service Routine

[cholland]

Hi,

I have some strange happenings going on.

When I enable a breakpoint in an ISR, the code immediately stops at the breakpoint.

It doesn't seem to be caused by the code, but only because of the breakpoint being set.

I set the breakpoint at random times. Like 3,4,5,6,7 minutes in and it's the same.

Somehow enabling a breakpoint is causing the ISR to be called?

I have a GPIO pin I enable for an interrupt.

SIUL2.MSCR[PC4].R = 0u;

SIUL2.MSCR[PC4].B.IBE = 1u;

SIUL2.IMCR[674-512].B.SSS = 1u;

SIUL2.IFEER0.B.IFEE18 = 1u; /*falling edge event enabled (As per HITS Active Level = Low) */

/* SIUL2.IFER0.B.IFE18 = 1u; */ /*enable interrupt filter */

SIUL2.IRER0.B.EIRE18 = 1u; /*enable interrupt */

void SIUL_EIRQ_C(void)

{

   if(SIUL2.ISR0.B.EIF18) /* TP 394 */

   {

   /* Clear IRQ 18 */

   SIUL2.ISR0.B.EIF18 = 1;   <-- When I enable breakpoint here, the code stops immediately

   WDTC++;                           <-- Counter is 0.

   }

}

Thanks

[martin_kovar]

Hello,

could you please specify which IDE and version you use?

It is strange behavior and break point adding should not affect the code this way.

Regards,

Martin

[cholland]

So, somehow the breakpoint is tied to IRQ 18.

I can set the breakpoint in other parts of the code and whenever I do, only IRQ 18 triggers.

I set counters to monitor how many times all the IRQs trigger. When I break in other parts of the program,

I only see the IRQ 18 counter increase.

So it doesn't matter where the break point is set, I just know that each time the breakpoint is set, IRQ 18 triggers.

Thanks,

[cholland]

Hi Martin,

I went back and setup ISRs for SIUL_EIRQ_0_7, SIUL_EIRQ_8_15 and SIUL_EIRQ_24_31.

None of the other ISRs have a problem. It only seems to happen with SIUL_EIRQ_16_23.

I changed the ISR names in hopes something would change, but nothing did.

(uint32_t) &SIUL_EIRQ_0_7, /* Vector # 243 SIUL EIRQ [0-7] - SIUL Combined External Interrupt */

(uint32_t) &SIUL_EIRQ_8_15, /* Vector # 244 SIUL EIRQ [8-15] - SIUL Combined External Interrupt */

(uint32_t) &SIUL_EIRQ_16_23, /* Vector # 245 SIUL EIRQ [16-23] - SIUL Combined External Interrupt */

(uint32_t) &SIUL_EIRQ_24_31, /* Vector # 246 SIUL EIRQ [24-31] - SIUL Combined External Interrupt */

Also, it doesn't matter where I add the breakpoint.

void SIUL_EIRQ_16_23(void)

{

   if(SIUL2.ISR0.B.EIF18) /* TP 394 */

   {

   /* Clear IRQ 18 */

   SIUL2.ISR0.B.EIF18 = 1;

   WDTC++;

   }

}

[cholland]

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