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Altera_Forum's avatar
Altera_Forum
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15 years ago

cannot printf "hello world"

hi:

In niosII eclipse,We always bug our software using "printf" command,I make the SOPC system using CPU,SDRAM,JTAG_UART,other components,sometimes according to the requirment of project,I delete or add the "other component ",the base project is the altera demo.

maybe the NiosII eclipse BUG, or maybe I overlook something,sometimes will generate puzzled results,though I have set stdin/stdout/stderr to JTAG_UART.

the sad problem is "cannot printf " ,though I use the simplest NiosII temple,and there is no single warning or error in console window(as attachments),in attachment named "console.bmp",download successfully,but cannot printf "hello world"

PS:the project is based on the old project which is OK,I only delect some components in SOPC.

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Hi,

    1. The lightweight libraries do not offer printf() function. Something like that.

    2. Are you sure you use jtag... for std_out in system library settings ?

    ++
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    hi:

    thanks for your suggestion~!

    the setting I have checked,there seems no problem,

    the problem is always there,maybe I could find the reason later~

    ps: may I ask you a question,that is : Have you ever used VIP demo?

    thanks a lot!~
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    --- Quote Start ---

    hi:

    thanks for your suggestion~!

    the setting I have checked,there seems no problem,

    the problem is always there,maybe I could find the reason later~

    ps: may I ask you a question,that is : Have you ever used VIP demo?

    thanks a lot!~

    --- Quote End ---

    No, I have never used VIP demo.

    For your problem, maybe the software doesn't start or doesn't boot.

    I know that after downloading to FLASH, the CPU is "paused" and I need to reboot the target board. This operation is normal.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    yes,maybe you are right

    clear the NiosII eclipse,or build the software again ,it can print OK

    sometimes,I focus strongly on hardware !~