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Altera_Forum
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13 years ago

unable to read data on Interrupt

I have ALtera DE2_115 Board having Cyclone IV E, I am getting 8 bit data on 8-bit bus @ 125 kbps along with Clock. now i treat this clock (125kbps) as a interrupt and read 8-bit bus data o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

125kbps means irq handler needs to be called within a 8us period. Any delay would lead to missing data.

So, I guess this isr freuqency is too fast for your Nios system.

What's the system clock frequency? Do you use an OS or do you have any other isr?

Does you code runs on onchip memory or dram? Does your Nios have code cache?