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Timestamp Timer Problem

Altera_Forum
Honored Contributor II
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Hi, 

 

I'm using Quartus 12.0 SP1 with SOPC Builder and have a Problem with my Timestamp Timer. 

 

 

I implement in my SOPC-System a Timer with 1ms and "Fixed period" and "readable snapshot". After that I generate the NIOS II and compile my VHDL-Project. 

 

In the NIOS II IDE I implement this timer as timestamp timer. 

 

My C-Code is the following: 

unsignedint uiTimeMeas1,uiTimeMeas2; int iTicks,iTimestampStart; uiTimeMeas1 = alt_timestamp(); iTimestampStart = alt_timestamp_start(); uiTimeMeas2 = alt_timestamp(); iTicks = alt_timestamp_freq();  

 

 

 

The result If I Debug this Code is my Problem: 

 

uiTimeMeas1 4294885376 

iTimestampStart 0  

uiTimeMeas2 4294885412  

iTicks 81920000  

 

I think uiTimeMeas2 is to big and alt_timesamp_start() doesn't work correct. 

 

Can anybody help me. 

 

Thanks
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