NIOS II HW/SW Interface

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originally posted by fplank@Jun 5 2006, 02:55 AM

hello

thanks, but i know this paper (nios ii hardware development tutorial ) allready. this paper shows fine how to build a soc with standard components.

but my problem is, that i have a own component topach_avalonslave wich a

avalonreadslave base adr:0xyyyyyyyy and avalonwriteslvae base adr: 0xzzzzzzzz

and my question is how can i write an value like int i=2 on the avalonwriteslave and how can i read the value from the avalonreadslave?

can i use the macros like

iowr_altera_avalon_pio_data(????;i);

thanks for your help

lg florian

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Hi lg florian,

It sounds like what you want to do are memory mapped IOs. You can declare a pointer to the address locations directly (or use the system.h declarations of the component&#39;s base address with an offset).

Then you only have to write a value to a pointer location or read back a value from a pointer location in your program.

It may look something like this (this is a very simple way of doing this, I&#39;m sure there are much better ways):

// defines LED_BASE to have address value # define LED_BASE 0xyyyyyyyy

volatile unsigned int *led_port = ((volatile unsigned int *) (LED_BASE));

// declares pointer to LED_BASE address location

.

.

void main()

.

.

*led_port = 0x5555aaaa; // writes value to LEd_BASE address

.

.

I hope this helps.

Regards,

-ATJ