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Fjato's avatar
Fjato
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6 years ago

How do I use PIO which is configured as InOut?

Hi, For a Cyclone V project I configured a PIO as InOut with a width of 1 bit in Qsys. Unfortunately I am not quite sure how to use the PIO to write and read data. So, which value do I need to write...
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Fjato
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6 years ago

Hi, thanks for your reply. But I am not speaking about the bidirectional setting.

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The IOs can be configured as Input, Output, Bidirectional and InOut. The first three ones are self-explanatory for me and are well documented. What I would like to know is the fourth setting InOut. If setting a single IO to InOut, I have access to two IO pins in Quartus, one being fixed input and the other one being fixed output. So I doubt, that I can set the direction for the pin. Instead I would expect, that I can write data for the output pin to the data register and read data from the input pin from another data register. But I can not find out what's the correct address / offset for both data register (offset "0" and bit "1" would be the case for all the other settings Input, Output and Bidirectional).

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I hope could point out a problem a bit more. Pleas let me know if I misunderstood something. Thank you in advance and best regards.