• State Not Answered
  • Locked Locked
  • Replies 2 replies
  • Subscribers 21 subscribers
  • Views 2000 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Printf / Fprintf

Kasper Jepsen

Hello,

What happens when i call:
(Keil compiler)
Printf
fprintf(stdout...)
fprintf(stderr...)

Which functions are called for the low level write??

putc / _sys_write ???

What are the arguments, 8000 to 8002?

Does all 3 "printf" call same _sys_write ?

I have added:
#pragma import(__use_no_semihosting_swi)
(is it enough this line is in the retarget.c?)

It seems the only one of above calls _sys_write is fprintf(stderr...) and of cause a file..

Please, is there any place to read these information as well?

Kasper

Parents
  • 0 in reply to Kasper Jepsen

    Take a look at:

    REALVIEW LIBRARIES AND FLOATING POINT SUPPORT GUIDE BOOK.
    The C and C++ Libraries -> Building an application with the C library -> Using the library with an application.

    The C and C++ Libraries -> Tailoring the input/output functions.

    REALVIEW COMPILER USER'S GUIDE BOOK.
    Semihosting.

    These books comes with KEIL MDK

Reply
  • 0 in reply to Kasper Jepsen

    Take a look at:

    REALVIEW LIBRARIES AND FLOATING POINT SUPPORT GUIDE BOOK.
    The C and C++ Libraries -> Building an application with the C library -> Using the library with an application.

    The C and C++ Libraries -> Tailoring the input/output functions.

    REALVIEW COMPILER USER'S GUIDE BOOK.
    Semihosting.

    These books comes with KEIL MDK

Children
No data