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AAndyy's avatar
AAndyy
Icon for New Contributor rankNew Contributor
4 years ago

Newlib getc() hangs the program

Using the web edition of Quartus Prime rev 18.1 .

Implementing a NIOS II based design in a Max10 chip.

Using the standard C library function calls that Newlib supports.

I have verified that getc() (and maybe other character handling functions) hangs the program. I know this from using hardware strobes that the program asserts immediately prior to getc() and deasserts immediately after getc(). I monitor these strobes on an o'scope. getc() never returns! But the problem is not consistent. Sometimes getc() works, sometimes it doesn't.

Using a UART implemented in the Platform Designer tool. This UART communicates with external system, not stdin or stdout.

Please help!!!

Thanks!

4 Replies

  • EBERLAZARE_I_Intel's avatar
    EBERLAZARE_I_Intel
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    Hi,


    Did you use any example design? OR did you create your own?


    Did you received any error when generating a Makefile?


  • AAndyy's avatar
    AAndyy
    Icon for New Contributor rankNew Contributor
    4 years ago

    This is a custom design.

    I don't recall any error when generating the makefile....what sort of error would you expect to see?

  • EBERLAZARE_I_Intel's avatar
    EBERLAZARE_I_Intel
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi,


    Could you share the build log for the newlib? I presume it was successful/completed based on your description. And the issue is related to its functionality of your custom design. Is the issue also with other designs or any example design that you have tried? OR is it only on a particular custom design that you have tested?