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Altera_Forum's avatar
Altera_Forum
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16 years ago

Problem about interval timer

Hi guys now i want to use the interval timer as interrupt to send a 40khz sine wave to i/o port.but when i set the interval timer as 1us which equals the sampling frequecy of ad5547(1mhz),it does'...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi,

Sorry for the silence, I was travelling.

What you described is quite strange, because normally the interrupt flag of the timer must be exactly at the same interval (it is just a counter inside). I don't know how SignalTap works I never used it, I always use ModelSim to check the behaviour, so i cannot help you a lot on this.

But since you have only problem with high interrupt rate, this should be a problem of timing. Which version of the nios do you use ?