Beginners problems. i need assistance...

1. I have run into the system crash before as well. I find that if you build the project before you *** any files the problem goes away.

2. NIOS II HAL already has an interrupt handler you can find information on how to use it here (http://www.altera.com/literature/hb/nios2/n2sw_nii52006.pdf).

3. I don't think you can put a variable at a specfic address (some else may correct me); however, you can put it into a specific memory area.

example:

alt_u32 foo __attribute__((.section(".sdram"))); // usually a global variable

you can find out which memory areas there are in the system library properties.

4. Most of your question can be anwered in the nios ii software development handbook (http://www.altera.com/literature/hb/nios2/n2sw_nii5v2.pdf).

5. Also I suggest you take the time to watch the Altera Demonstrations Course: nios ii integrated development environment (ide) overview (http://www.demosondemand.com/trainingapp/player/index.asp?sessid=alt075&promotion_id=1626&starttime=0), it will help you better understand the NIOS II IDE.

6. All NIOS II Literature is here (http://www.altera.com/literature/lit-nio2.jsp).

Hope this will answer your questions.