Question about defining a Custom component in Sopc builder

in the document, NiosII and customIP are not comunicating by printf().

they are comunicating by the address.

when you access to 0x000000

customIP gets those signals

offsett address -> avs_address

valid signal -> avs_write

data -> avs_writedata

when you get avs_write high, you can choose what to do with the address and data.

in this example, what to do is store data of address 0 and return the value when address 0 is called.

you can select what to do with the address number, this is the register mapping.

you can communicate from NiosII into native hard ware language(HDL).

try it anyway.