New to NIOS

See chapter 9 of

Nios II Software Developer's Handbook

iowr_32direct

Please allow me to give you a bit more detail because I've been there and still not sure how to proceed.

I'm using the Nios II/e along with jtag uart, sysid and onchip memory.

My objective here is to write to the onchip memory a value that I can

access and pinout to an LED on my cyclone III fpga.

So 2 issues as I see it:

1) how do I actually write to the onchip memory from my nios II

(i.e what is the syntax of a write and do i need some external libs)

2) once i write to the onchip memory, how do i actually access that memory from outside of my sopc project. How do I interface with the rest of my fpga?? Currently my nios system only has a reset and a clock port. How in the world am I to access the contents of memory of the onchip memory and then connect that to a pin on my fpga?

nios_test_system_1

(

.clk_0 (clk40),

.reset_n (1)

);

For that particular action, you're going to want to instantiate an output PIO, 1 bit wide (assuming 1 LED), and hook it up to your LED at the top level.

In your Nios II code, you'd just use a PIO macro to write a 1 or 0 to control the LED. Look at the count_binary example for a decent sample of how to do this.

Cheers,

--slacker