El 25/9/2015 13:17, "sudarshan.rajagopalan" <sudarshan.rajagopa...@vecna.com> escribió: > > On 2015-09-25 11:06, Daniel Gutson wrote: >> >> On Thu, Sep 24, 2015 at 4:49 PM, sudarshan.rajagopalan >> <sudarshan.rajagopa...@vecna.com> wrote: >>> >>> Hey all, >>> >>> We are developing a new BSP that uses math.h in few of the BSP files. I do >> >> >> May I ask why do you need floating point operations in a kernel? At >> least, what sort of operations and why not move them upwards. > > > We are doing floating point operations in one of the device drivers as part of the BSP - to perform buadrate calculation, to be specific, which involes inverse operations and using roundf().
How will you handle fp exceptions? Did you consider using fixed point? > > >> >>> understand that the math library functions are not part of standard C >>> library and has to be linked using "-lm". So I include "LD_LIBS += -lm" in >>> the custom .cgf config file but this doesn't seem to work. I think this has >>> to be linked in a proper order. Could someone help with this? >>> >>> Heres the custom config file: >>> >>> include $(RTEMS_ROOT)/make/custom/default.cfg >>> >>> RTEMS_CPU = arm >>> >>> LD_LIBS += -lm >>> >>> CPU_CFLAGS = -march=armv7-m -mthumb >>> >>> CFLAGS_OPTIMIZE_V = -O0 -g -mfloat-abi=hard -mfpu=fpv4-sp-d16 >>> >>> Thanks and Regards, >>> Sudarshan >>> _______________________________________________ >>> devel mailing list >>> devel@rtems.org >>> http://lists.rtems.org/mailman/listinfo/devel > >
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