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printf retatgeting problem

Being Human

I have defined & declared the functions 'sendchar' and 'getkey' as stated in the keil Help documents.

but in retarget.c, the following lines are never compiled.
I have included stdio header file in the source file where printf function is used.

#ifdef STDIO
 extern int sendchar (int ch);
 extern int getkey (void);
#endif

cant figure out what is wrong.

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  • 0

    Have figured it out.

    select the retarget.c file in the project window, right click and select "options for file 'retarget.c' "

    in the pop-up window, select C/C++ tab. in the preprocessor symbols Define field, enter "STDIO".

    The compiler control string is modified to

    -c --cpu Cortex-M3 -D__RTX -g -O0 --apcs=interwork -I ".\src n inc" -I
C:\Keil\ARM\RV31\Inc -I C:\Keil\ARM\CMSIS\Include -I C:\Keil\ARM\Inc\NXP\LPC177x_8x -DSTDIO -o ".\obj\retarget.o"

Reply
  • 0

    Have figured it out.

    select the retarget.c file in the project window, right click and select "options for file 'retarget.c' "

    in the pop-up window, select C/C++ tab. in the preprocessor symbols Define field, enter "STDIO".

    The compiler control string is modified to

    -c --cpu Cortex-M3 -D__RTX -g -O0 --apcs=interwork -I ".\src n inc" -I
C:\Keil\ARM\RV31\Inc -I C:\Keil\ARM\CMSIS\Include -I C:\Keil\ARM\Inc\NXP\LPC177x_8x -DSTDIO -o ".\obj\retarget.o"

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