Re: Pointing to Interval Timer Nios

Altera_Forum · ‎01-22-2018

Hello,

I am new to Nios and was wondering if someone could help me figure out what I am doing wrong pointing to the interval timer. I have read the Embedded Peripherals section on it multiple times and it has not helped. I used pointers as opposed to using IRQs, becuase thats how the LED example was, I am trying to eventually create a program that has a Real time sampling interval, because I will be adding an ADC next. I have been adding the components one at a time to understand their functionality and properly use them. If I have a wrong approach for the leads with pointers please correct me as well. I had the leds working with a counter. I was trying to just check and reset the status register for the interval timer so that I could have it update the leds on the timers cycle. I know there are code examples, but writing my own and working through it is the best way to learn, I just got stuck and wasn't sure why this approach was not working when it did for the leds. Thanks a bunch


# include <stdio.h># include <system.h>
int main()
{
    int* led= (int *)PIO_0_BASE; // air pio pins into the regulator
    int* timer_status= (int *)TIMER_0_BASE;
    int count=0;
    *led=0x3;
     while(1)
      {
         if(*timer_status==0x1)
         {
             *timer_status=0x0;
             if (count==0) {
            *led=0x3;
            //*air=0x3;
              count=1;
             }
             else if (count==1) {
            *led=0x2;
              count=2;
             }
             else if (count==2) {
             *led=0x1;
             count=3;
             }
             else if (count==3) {
             *led=0x0;
             count=0;
             }
         }
         
      }
     return 0;
}

Altera_Forum · ‎01-22-2018

So I did a lot of reading and learned a bunch about the HAL which didn't help me. I found out that to fix my code I have to keep telling the counter to start after it finishes. Is there a way to make it just keep recounting in Platform designer/Qsys? I thought that was the default setting already.