DM6437 - How to use VDINT0 interrupt to trigger my ISR by using HWI?

Jason14471

I have my ISR called "VDINT0_HWI()" in the main.c file shown as below

void VDINT0_HWI()
{
VDINT0_count++; //VDINT0_count is a global variable, accumulated everytime VDINT0 interrupt occurs
LOG_printf( &trace, "Entering VDINT0 interrupt service routine in [%d] counts \r\n", VDINT0_count);
}

I have configured my HWI_INT5 as

bios.HWI.instance("HWI_INT5").interruptSelectNumber = 24;
bios.HWI.instance("HWI_INT5").fxn = prog.extern("VDINT0_HWI");
bios.HWI.instance("HWI_INT5").useDispatcher = 1;
bios.HWI.instance("HWI_INT5").arg = 0;

But the message did not show up in the trace log window. Does that mean the VDINT0 interrupt did not occur or something else?

How do I know the VDINT0 really occurs? Do I need to set GIE (Global Interrupt Enable)? [ if yes, how? ]

Did I miss something? Help please

over 16 years ago

0 TimHarron over 16 years ago

TI__Mastermind 18130 points

Jason said:
How do I know the VDINT0 really occurs? Do I need to set GIE (Global Interrupt Enable)? [ if yes, how? ]

You need to enable INT5 manually inside the IER register (IER[5]). The IER register is used to enable or disable specific interrupt events. The GIE bit will be set by BIOS automatically after your main function returns. If you have already enabled the IER bit for HWI_INT5 then I would say you are not actually receiving the interrupt event. You can also check the IFR register when IER[5] = 0 to see if the event is captured.

0 Jason14471 over 16 years ago in reply to TimHarron

Prodigy 90 points

Could you tell me how to manually enable the INT5 in IER register?

0 TimHarron over 16 years ago in reply to Jason14471

TI__Mastermind 18130 points

#include <c6x.h>
// ...
IER |= 0x20;
// ...

The c6x.h file includes a cregister definition of the IER register. This cregister definition is needed because the IER register is only accesible via CPU (i.e., it is not memory-mapped). As such the cregister definition tells the compiler that this is a special register that requires a special assembly instruction to access it.

Alternately you could do this a little more elegantly if you are using DSP/BIOS via the BIOS API:

#include <c64.h>
// ...
C64_enableIER(C64_EINT5);
// ...

0 Jason14471 over 16 years ago in reply to TimHarron

Prodigy 90 points

Tim,

It works, Thank you very much

-Jason

0 TimHarron over 16 years ago in reply to Jason14471

TI__Mastermind 18130 points

Great, glad to hear it!

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DM6437 - How to use VDINT0 interrupt to trigger my ISR by using HWI?