I have a problem with the printf function, # include <stdio.h> int main() { printf("Hello from Nios II!\n"); return 0; } that is the simple program that i tried to run, however the printf function did not print the sentence to the console, i am using the nios2 IDE. does anyone know why it doesnt display the printf sentence? the console remains as this: nios2-terminal: connected to hardware target using JTAG UART on cable nios2-terminal: "USB-Blaster [USB-0]", device 1, instance 0 nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)

--- Quote Start --- originally posted by estellrum@Mar 28 2007, 08:38 AM i have a problem with the printf function, # include <stdio.h> int main() { printf("hello from nios ii!\n"); return 0; } that is the simple program that i tried to run, however the printf function did not print the sentence to the console, i am using the nios2 ide. does anyone know why it doesnt display the printf sentence? the console remains as this: nios2-terminal: connected to hardware target using jtag uart on cable nios2-terminal: "usb-blaster [usb-0]", device 1, instance 0 nios2-terminal: (use the ide stop button or ctrl-c to terminate) <div align='right'><{post_snapback}> (index.php?act=findpost&pid=22588) --- quote end --- --- Quote End --- The printf use stdout as the output channel, so one possible cause is that there is no stdout device in the system, you can check this by selecting you project in Nios IDE&#39;s Project Navigation panel, right click "System Library Properties". If no stdout device is there, a common solution is to add a JTAG_UART device into your system in SOPC Builder.

mine isn&#39;t working either. I am using Quartus 5.0 and Nios II IDE 5.0 with the niosII_stratixII_2s60/standard example, meaning that I do have a JTAG_UART device on my processor. I double checked if the stdout is binded with the jtag device and it is. I still don&#39;t get anything after the "press ctrl+c to terminate" message. Any ideas ? --- Quote Start --- originally posted by arrive+mar 28 2007, 12:47 pm--><div class='quotetop'>quote (arrive @ mar 28 2007, 12:47 pm)</div> --- quote start --- <!--quotebegin-estellrum@Mar 28 2007, 08:38 AM i have a problem with the printf function, # include <stdio.h> int main() { printf("hello from nios ii!\n"); return 0; } that is the simple program that i tried to run, however the printf function did not print the sentence to the console, i am using the nios2 ide. does anyone know why it doesnt display the printf sentence? the console remains as this: nios2-terminal: connected to hardware target using jtag uart on cable nios2-terminal: "usb-blaster [usb-0]", device 1, instance 0 nios2-terminal: (use the ide stop button or ctrl-c to terminate) <div align='right'><{post_snapback}> (index.php?act=findpost&pid=22588) --- quote end --- --- Quote End --- The printf use stdout as the output channel, so one possible cause is that there is no stdout device in the system, you can check this by selecting you project in Nios IDE&#39;s Project Navigation panel, right click "System Library Properties". If no stdout device is there, a common solution is to add a JTAG_UART device into your system in SOPC Builder. <div align='right'><{post_snapback}> (index.php?act=findpost&pid=22594)</div> [/b] --- Quote End ---

Try debugging your code. You might have some sort of device/component initialization issue that is causing your code to get stuck prior to even entering main() or you might, inadvertently, be causing some sort of spurious interrupt issue. At the very least, debugging your code will tell you more about your problem... Cheers, - slacker

Well i did spent a few hours debugging it, in the debug panel, it has an error: <terminated, exit value : 0> NIOS II Download output (3/29/07 9.26PM) Nios II terminal window nios2-gdb-server output debugger process as you can see, the bottom 3 are running fine, but the first one...is always red and not running. can anyone please help me?..thankyou i already made sure the JTAG_uart is assciated.

So, your code isn&#39;t downloading? Do you have a JTAG Debug Module, with a leve of at least 1, enabled on your CPU? If not, then download/debug will not function. If the debugger never makes it to main(), then you need to experiment with setting breakpoints earlier. In the Run/Debug target menu, you&#39;ll find an option to set the initial breakpoint at alt_main(). Cheers, - slacker

Printf not displaying characters | Altera Community

14 Replies

Altera_Forum
Honored Contributor
16 years ago
I have the same problem. printf() does not display any characters on the console. If I place all sections in the external SRAM everything works fine. Running from within the onchip RAM the function does not display anything. Maybe printf() requires more RAM. I have only 2k left (internal RAM). In all of my last application this was no problem, but now there is ess memory. Maybe this is the reason?

Try to use more on-chip RAM.
Altera_Forum
Honored Contributor
13 years ago
Hi all,
I know it is very late to answer this question. However, I decided to post what I found just in case someone come by this thread or searches for this problem then he can find my notes.

What I found is that printf() can work only if the related interrupt is enabled. You can put alt_irq_enable_all( 0x01 ); at the beginning of your main function and hopefully everything will go fine.
Altera_Forum
Honored Contributor
10 years ago
long shot...but i have the same problem after updating to windows 10...JTAG i qsys, stdio set to jtag code running(led control) but no output from alt_printf or printf but both functions returns...

thanks in advance (in case somebody sees this old thread)
Altera_Forum
Honored Contributor
10 years ago
Found something. Hope this helps: https://www.altera.com/support/support-resources/knowledge-base/solutions/rd12102004_5019.html

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Printf not displaying characters

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