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nrf: Add support for floating point on nrf52 targets. 

Duplicating pattern for detecting location of libm, libc and libgcc
from teensy port. Activating MICROPY_FLOAT_IMPL (FLOAT) for nrf52 targets
and adding libs into the compile. For nrf51 targets it is still set to
NONE as code grows to much (about 30k).

Some numbers on flash use if MICROPY_FLOAT_IMPL is set to
MICROPY_FLOAT_IMPL_FLOAT and math libraries are enabled (lgcc, lc, lm).

nrf51:
======

without float support:
   text	   data	    bss	    dec	    hex	filename
 144088	    260	  30020	 174368	  2a920	build-pca10028/firmware.elf

with float support:
   text	   data	    bss	    dec	    hex	filename
 176228	   1336	  30020	 207584	  32ae0	build-pca10028/firmware.elf

nrf52:
======

without float support:
   text	   data	    bss	    dec	    hex	filename
 142040	    356	  36236	 178632	  2b9c8	build-pca10040/firmware.elf

with float support:
   text	   data	    bss	    dec	    hex	filename
 165068	   1436	  36236	 202740	  317f4	build-pca10040/firmware.elf
This commit is contained in:
Glenn Ruben Bakke 2017-07-18 00:18:05 +02:00 committed by glennrub
parent 785fb6928b
commit 863a5c1734
2 changed files with 16 additions and 1 deletions
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12
nrf/Makefile
View File

@ -90,7 +90,17 @@ CFLAGS += -Os -DNDEBUG
LDFLAGS += -Os
endif
LIBS += \
LIBS = \
ifeq ($(MCU_VARIANT), nrf52)
LIBM_FILE_NAME = $(shell $(CC) $(CFLAGS) -print-file-name=libm.a)
LIBC_FILE_NAME = $(shell $(CC) $(CFLAGS) -print-file-name=libc.a)
LIBGCC_FILE_NAME = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
LIBS += -L $(dir $(LIBM_FILE_NAME)) -lm
LIBS += -L $(dir $(LIBC_FILE_NAME)) -lc
LIBS += -L $(dir $(LIBGCC_FILE_NAME)) -lgcc
endif
SRC_LIB = $(addprefix lib/,\
libc/string0.c \

5
nrf/mpconfigport.h
View File

@ -45,7 +45,12 @@
#define MICROPY_REPL_AUTO_INDENT (1)
#define MICROPY_ENABLE_SOURCE_LINE (0)
#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_MPZ)
#if NRF51
#define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_NONE)
#else
#define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_FLOAT)
#endif
#define MICROPY_OPT_COMPUTED_GOTO (0)
#define MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE (0)
#define MICROPY_OPT_MPZ_BITWISE (0)