How to use IOWR and IORD functions

Hello,

Are you sure that you followed the design cycle correctly?

If you want to make a custom component, and you do not start from scratch, you need to know how design files are copied / duplicated whey you compile / instantiate your qsys design.

If not, the code you modify will not necessarily be the code Quartus compiles.

One thing you can do is follow the tutorials that are available to create custom components.

Other thing you can do is put some diagnostics code in your code, use only the write IOWR command in Nios and see where you get.

What you also can do is use Signaltap and see what is going on in your FPGA but this is a bit more complicated.

Best Regards,

johi.