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Valued Contributor III
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Problem with Printf

I ve written a simple C-program running on Nios with output on JTAG-Uart Console. 

 

Why if the surce code is 

 

 

int m; 

m=9; 

printf("%d",m); 

 

everthing works perfectly while if the source code is modified in: 

 

int m; 

m=10; 

printf("%d",m); 

 

it does not work anymore ???
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4 Replies
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Valued Contributor III
4 Views

moreover 

 

please note that this strange behaviour occours using Nios II(e),  

while using Nios II(s) everithing works well.
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Valued Contributor III
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Hi, telle us more information 

 

for your 1st problem, 

What did you get ? "9" on nios2-terminal instead of 10 ? if so, clean and rebuild your nios project. 

Maybe the new soft was not correctly downloaded, did you get errors ? 

 

For your 2nd problem, 

When you chose Nios II/e (=economic version), do you regenerate the Qsys, recompile the design, redownload to FPGA, do you rebuild the BSP, do you recompile the soft ? 

 

regards
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Valued Contributor III
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Thank you for your answer 

 

The code is exactly what I write ! 

If I ask "printf" to write a integer number (%d) with a single digit it works correctly, 

otherwise (just changing the 9 in 10) the program restart from the begin in a infinite loop. 

 

Actually I've similar problem also using the multiplier (*) operator: sometimes it work but with few marginal  

changing in the code, the execution restart from the beginning in an infinite loop. 

 

However I noticed that this problem is limited to the usage of Nios II-e, while just changing the processor to Nios II-s and with no other modification 

both the "printf" and the "multiplier" works correctly. 

 

> When you chose Nios II/e (=economic version), do you regenerate the Qsys, recompile the design, redownload to FPGA, do you rebuild the BSP, do you recompile the soft ? 

 

Of course !
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Valued Contributor III
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Could be stack overflow

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