timer interrupts and endpoint interupts

	franz1280 posted on 21 Dec 2011 10:44 PM PST Member 3 Forum Posts

Can timer 0 ISR(void) interrupt TMR0_VECT can be called inside void ISR_Ep4inout(void) interrupt 0?

I cannot access Timer 0 ISR inside ISR_Ep4inout.

Does Timer 0 have a higher interrupt priority than Endpoint 4 buffer?

Just checking. Thank you very much.

Re: timer interrupts and endpoint interupts

	Gayathri posted on 22 Dec 2011 04:27 AM PST Cypress Employee 428 Forum Posts

Hi,

Endpoint interrupt is having a higher priority than the Timer interrupt.

Regards,

Gayathri

Re: timer interrupts and endpoint interupts

	aasi posted on 22 Dec 2011 06:35 AM PST Cypress Employee 1090 Forum Posts

Is keil even allowing you to compile the code when you try calling an ISR from another ISR?

The problem here is ISR use RETI to return from interrupt. If you call one ISR from another, there is only one ISR registered in the hardware and you'll end up executing 2 RETIs and the hardware doesn't have a second interrupt to return from.

Irrespective of the ISRs involved I don't think calling an ISR from another ISR will even compile.

Regards,

Anand

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timer interrupts and endpoint interupts

Re: timer interrupts and endpoint interupts

Re: timer interrupts and endpoint interupts