How to use math function in the OMAP3530

beaver

When I include the "math.h" and use math function such as cos(), sin(), I found compiling error. How to solve this problem?

over 15 years ago

0 Steve Kipisz over 15 years ago

TI__Genius 15510 points

Can you copy/paste the compiling error?

Steve K.

0 Clay Montgomery over 15 years ago

TI__Intellectual 1910 points

Beaver,

Start with the documentation for the C compiler you are using. There is probably a choice of various run-time libraries with different levels of support for floating point functions. You are probably linking with the wrong library. If you are using single or double precision float, be sure that is available.

Regards, Clay

0 beaver over 15 years ago in reply to Steve Kipisz

Intellectual 575 points

Here is the error in the compiler:

XXX@ubuntu:~/OMAP35x_SDK_1.0.2/hpi_ver5$ arm-none-linux-gnueabi-gcc -o hpi_demo_ver5 hpi_demo.c

/tmp/ccKI0BHQ.o: In function `fft_rec':

hpi_demo.c:(.text+0x480): undefined reference to `cos'

hpi_demo.c:(.text+0x4fc): undefined reference to `sin'

collect2: ld returned 1 exit status

0 Steve Kipisz over 15 years ago in reply to beaver

TI__Genius 15510 points

The math library isn't getting linked in. At the end of the compile line, add -lm to link in libm.

Steve K.

0 beaver over 15 years ago in reply to Steve Kipisz

Intellectual 575 points

Thank you so much, the problem is solved.

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How to use math function in the OMAP3530