mimxrt: Add floating point support.

Since not all boards support double fp, all board specific .mk files are
affected too.

ports/mimxrt/Makefile

@@ -67,6 +67,21 @@ CFLAGS += -DXIP_EXTERNAL_FLASH=1 \
 	-DCPU_HEADER_H='<$(MCU_SERIES).h>'
 CFLAGS += $(CFLAGS_MOD) $(CFLAGS_EXTRA)
 
+# Configure floating point support
+ifeq ($(MICROPY_FLOAT_IMPL),double)
+CFLAGS += -DMICROPY_FLOAT_IMPL=MICROPY_FLOAT_IMPL_DOUBLE
+else
+ifeq ($(MICROPY_FLOAT_IMPL),none)
+CFLAGS += -DMICROPY_FLOAT_IMPL=MICROPY_FLOAT_IMPL_NONE
+else
+CFLAGS += -DMICROPY_FLOAT_IMPL=MICROPY_FLOAT_IMPL_FLOAT
+CFLAGS += -fsingle-precision-constant
+endif
+endif
+
+SUPPORTS_HARDWARE_FP_SINGLE = 0
+SUPPORTS_HARDWARE_FP_DOUBLE = 0
+
 LDFLAGS = $(addprefix -T,$(LD_FILES)) -Map=$@.map --cref --print-memory-usage
 LIBS = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
 
@@ -140,6 +155,99 @@ SRC_C = \
 	$(SRC_TINYUSB_C) \
 	$(SRC_TINYUSB_IMX_C) \
 
+ifeq ($(MICROPY_FLOAT_IMPL),double)
+LIBM_SRC_C += $(addprefix lib/libm_dbl/,\
+	__cos.c \
+	__expo2.c \
+	__fpclassify.c \
+	__rem_pio2.c \
+	__rem_pio2_large.c \
+	__signbit.c \
+	__sin.c \
+	__tan.c \
+	acos.c \
+	acosh.c \
+	asin.c \
+	asinh.c \
+	atan.c \
+	atan2.c \
+	atanh.c \
+	ceil.c \
+	cos.c \
+	cosh.c \
+	copysign.c \
+	erf.c \
+	exp.c \
+	expm1.c \
+	floor.c \
+	fmod.c \
+	frexp.c \
+	ldexp.c \
+	lgamma.c \
+	log.c \
+	log10.c \
+	log1p.c \
+	modf.c \
+	nearbyint.c \
+	pow.c \
+	rint.c \
+	round.c \
+	scalbn.c \
+	sin.c \
+	sinh.c \
+	tan.c \
+	tanh.c \
+	tgamma.c \
+	trunc.c \
+	)
+ifeq ($(SUPPORTS_HARDWARE_FP_DOUBLE),1)
+LIBM_SRC_C += lib/libm_dbl/thumb_vfp_sqrt.c
+else
+LIBM_SRC_C += lib/libm_dbl/sqrt.c
+endif
+else
+LIBM_SRC_C += $(addprefix lib/libm/,\
+	math.c \
+	acoshf.c \
+	asinfacosf.c \
+	asinhf.c \
+	atan2f.c \
+	atanf.c \
+	atanhf.c \
+	ef_rem_pio2.c \
+	erf_lgamma.c \
+	fmodf.c \
+	kf_cos.c \
+	kf_rem_pio2.c \
+	kf_sin.c \
+	kf_tan.c \
+	log1pf.c \
+	nearbyintf.c \
+	roundf.c \
+	sf_cos.c \
+	sf_erf.c \
+	sf_frexp.c \
+	sf_ldexp.c \
+	sf_modf.c \
+	sf_sin.c \
+	sf_tan.c \
+	wf_lgamma.c \
+	wf_tgamma.c \
+	)
+ifeq ($(SUPPORTS_HARDWARE_FP_SINGLE),1)
+LIBM_SRC_C += lib/libm/thumb_vfp_sqrtf.c
+else
+LIBM_SRC_C += lib/libm/ef_sqrt.c
+endif
+endif
+
+LIBM_O = $(addprefix $(BUILD)/, $(LIBM_SRC_C:.c=.o))
+
+# Too many warnings in libm_dbl, disable for now.
+ifeq ($(MICROPY_FLOAT_IMPL),double)
+$(LIBM_O): CFLAGS := $(filter-out -Wdouble-promotion -Wfloat-conversion, $(CFLAGS))
+endif
+
 SRC_SS = $(MCU_DIR)/gcc/startup_$(MCU_SERIES).S
 
 SRC_S = lib/utils/gchelper_m3.s \
@@ -160,6 +268,7 @@ SRC_QSTR += \
 	$(GEN_PINS_SRC) \
 
 OBJ += $(PY_O)
+OBJ += $(LIBM_O)
 OBJ += $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
 OBJ += $(addprefix $(BUILD)/, $(SRC_S:.s=.o))
 OBJ += $(addprefix $(BUILD)/, $(SRC_SS:.S=.o))

ports/mimxrt/boards/MIMXRT1010_EVK/mpconfigboard.mk

@@ -1,6 +1,8 @@
 MCU_SERIES = MIMXRT1011
 MCU_VARIANT = MIMXRT1011DAE5A
 
+MICROPY_FLOAT_IMPL = single
+
 JLINK_PATH = /media/RT1010-EVK/
 JLINK_COMMANDER_SCRIPT = $(BUILD)/script.jlink
 

ports/mimxrt/boards/MIMXRT1020_EVK/mpconfigboard.mk

@@ -1,6 +1,8 @@
 MCU_SERIES = MIMXRT1021
 MCU_VARIANT = MIMXRT1021DAG5A
 
+MICROPY_FLOAT_IMPL = double
+
 JLINK_PATH ?= /media/RT1020-EVK/
 JLINK_COMMANDER_SCRIPT = $(BUILD)/script.jlink
 

ports/mimxrt/boards/MIMXRT1050_EVK/mpconfigboard.mk

@@ -1,6 +1,8 @@
 MCU_SERIES = MIMXRT1052
 MCU_VARIANT = MIMXRT1052DVL6B
 
+MICROPY_FLOAT_IMPL = double
+
 JLINK_PATH ?= /media/RT1050-EVK/
 
 deploy: $(BUILD)/firmware.bin

ports/mimxrt/boards/MIMXRT1060_EVK/mpconfigboard.mk

@@ -1,6 +1,8 @@
 MCU_SERIES = MIMXRT1062
 MCU_VARIANT = MIMXRT1062DVJ6A
 
+MICROPY_FLOAT_IMPL = double
+
 JLINK_PATH ?= /media/RT1060-EVK/
 JLINK_COMMANDER_SCRIPT = $(BUILD)/script.jlink
 

ports/mimxrt/boards/MIMXRT1064_EVK/mpconfigboard.mk

@@ -1,6 +1,8 @@
 MCU_SERIES = MIMXRT1064
 MCU_VARIANT = MIMXRT1064DVL6A
 
+MICROPY_FLOAT_IMPL = double
+
 JLINK_PATH ?= /media/RT1064-EVK/
 
 CFLAGS += -DBOARD_FLASH_SIZE=0x400000

ports/mimxrt/boards/TEENSY40/mpconfigboard.mk

@@ -1,6 +1,8 @@
 MCU_SERIES = MIMXRT1062
 MCU_VARIANT = MIMXRT1062DVJ6A
 
+MICROPY_FLOAT_IMPL = double
+
 deploy: $(BUILD)/firmware.hex
 	teensy_loader_cli --mcu=imxrt1062 -v -w $<
 	sleep 1