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Altera_Forum
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16 years ago

Timer interrupt with RTOS-II

Hi all, I'm working with RTOS-II and I need a very precise timing for a simple function. I have a dedicated timer which can trigger an interrupt every 1ms. So I used alt_irq_register(MY_TIM...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

yes, you are right sort of. I think it depends on what instruction you were executing at the time of the interrupt. that instruction has to complete then the program counter is pushed and the ISR routine is executed. If the instruction you were executing was fetching data offchip or doing a divide vs just doing an add it could explain the jitter.