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The sleep time differs depending on whether the usleep function operates on OnChip Memory or on SDRAM.

Nios II Embedded SW(OS)

Category: Nios® II
Tools: Nios® II EDS
device:-


This is by design.
Since usleep calculates dummy cycles from the CPU frequency, the latency to where the program is deployed affects it.
In the case of the Nios® II economy core, the lack of cache may cause it to run slower than expected.
If you want to do it with an exact value, you should use a timer.


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