DE1 Basic Computer on Nios II SBT

Question

Hi everyone! I am a beginner with the Cyclone II board. Just got it last week. I tried to implement the DE1 Basic Computer project with the Altera Monitor Program and it works absolutely fine I wanted to implement the same with the Nios II SBT for Eclipse. The project builds and runs but only the Reset button, Red LEDs and the corresponding switches work. The 7 Segment Display and the Green LEDs do not work. On debugging I find that the "8 Second Timer" is never incremented. Is there something wrong with the interrupt and exception handling? Any suggestions?

altera_forum · Answer

Maybe you have to set a start bit on the timer register

altera_forum · Answer

I have no idea what that means! Is there like something that I can read? If it works with the monitor program, why does it not work with the SBT?

altera_forum · Answer

Take a look at the Interval Timer Core Docs at the following link page 251.

When you look at the registers there's the START and STOP bits, my guess is that you have to write the start bit, this way the timer will increment.

http://www.altera.com/literature/ug/ug_embedded_ip.pdf

altera_forum · Answer

Cool. So this means I need to add the Interval Timer core through Qsys, without which the timers in the code won't work?

altera_forum · Answer

Well, if the code compiles you might have 2 things to look at:

1. You don't have the code for the timer, and so you don't have the Interval Timer Core in Qsys

2. You have both but the interrupt is not working properly.

Maybe I got what you want to do, you want to increment a seconds variable with the timer interrupt?

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DE1 Basic Computer on Nios II SBT

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