how to find the APIs of the ip in nios?

[Altera_Forum]

hi everyone 

if i add an ip from the library in Qsys, how should i use it in Eclipse? is there an pdf or reference design to teach me how to use it?(like read/write, setup interrupt) and how can i find the APIs of the ip?

[Altera_Forum]

Hi, 

 it depends which IP you use. Try google the name of the ip or try the documentation button inside the opened qsys-ip...

[Altera_Forum]

Almost every IP core comes with some documentation, which can be more or less complete. 

If it's an IP from Altera or if the IP has been designed as a Qsys component, usually you have the HAL driver or, at least a register map to access it through IOWR/IORD. If you need to integrate a generic IP (i.e. from opencores.org) you may need to add a wrapper to interface it to Avalon bus, create a new custom device in Qsys and write the APIs yourself.