Question about defining a Custom component in Sopc builder

Question

Hi,

I'm trying to build a custom component in Sopc builder to insert it in a Nios2 system...but whole procedure is not completely clear for me...!!!

I don't understand if the registers to map on memory for component managing by processor have to be created by me in my custom logic block or SopC builder does that.

in many application notes as AN333 I found that it needs to insert a "register file" among with the other project VHDL files...but I don't understand how this register file is done.

Anyone for helping???

Regards

altera_forum · Answer

I'm not sure if this is exactly what you want

this is a document for custom IP construction.

http://www.akiron.com/fpga/customipinstruction.pdf

you can create one easy custom IP by following this document.

altera_forum · Answer

Thanks Akira...more or less...it is a starting point...but Is  the  communication between Nios2 and the custom component opened using only the printf() function ??? Does not It use IORD() and IOWR() macros to read and write  from/on peripherals???

altera_forum · Answer

I forgot....but in the pdf you send me...in component verilog code where are the registers to map??? how Is it done the mapping??

altera_forum · Answer

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.

altera_forum · Answer

ok...It's clear now on customIP side....but on nios side.....from the C code:

# include <stdio.h>

int main()

{

int *customAddress = 0x00000000;

customAddress[0] = x010;

printf(“my IP has value %d\m”,customAddress[0]);

}

if using prinf NiosII and CustomIP don't communicate, meaning that NiosII does not send data to CustomIP by printf.....in this context...what does printf() function serve to???

and for reading what command does it need???

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Question about defining a Custom component in Sopc builder

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