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Michael-C's avatar
Michael-C
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2 years ago

Nios-II Resets with PIO command

I am developing an application using the Nios-II embedded CPU. It utilizes multiple PIO ports, configured as inputs and outputs. I have one in particular that is being very troublesome. Everytime I w...
Nios Cpu
wwanalim_intel's avatar
wwanalim_intel
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2 years ago

Hi,


Can I know if the design is from any example design and what is the design to work on?


Michael-C's avatar
Michael-C
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2 years ago

Hello

I used a design example from approx 8-10 years ago, which was successful. This new design is similar but I am unsure why. I have attached the cpu_core.qsys file. The pio_cd_sol is the one giving me trouble. I have tried putting it to different address, change type from output to bi-dir, and some other settings, but nothing makes a difference. pio_cmd works perfectly and both appear to be the same.

When the Nios core resets, I think it first it trapped by a watch-dog timer (I was able to trace through it one in the "Debug as Nios" in the Eclipse environment ).

I don't think it is interrupt related as I do not have any interrupts connected in the Nios core for any of the PIO.

Michael