Offline compiling

Page last updated 24 Oct 2010, by Marcus Jansson. 0 replies

Offline compiling is accomplished by these steps:

1. Download and install the CodeSourcery toolchain for LPC17xx

2. Download

http://www.onarm.com/download/files/cmsis_v1p30.zip

from

http://www.onarm.com/download/download395.asp

3. Unpack and use these files:

• CMSIS_V1P30/CM3/CoreSupport/core_cm3.c
• CMSIS_V1P30/CM3/CoreSupport/core_cm3.h
• CMSIS_V1P30/CM3/DeviceSupport/NXP/LPC17xx/system_LPC17xx.c
• CMSIS_V1P30/CM3/DeviceSupport/NXP/LPC17xx/system_LPC17xx.h
• CMSIS_V1P30/CM3/DeviceSupport/NXP/LPC17xx/LPC17xx.h

when compiling for instance the example code in CMSIS_V1P30/CM3/Example/Sourcery G++Lite/LPC17xx/

by using a Makefile similar to this:

#  Project Name
PROJECT=mbed_test
#  List of the objects files to be compiled/assembled
OBJECTS=startup_LPC17xx.o core_cm3.o system_LPC17xx.o main_LPC17xx.o 
LSCRIPT=LPC17xx.ld

OPTIMIZATION = 0
DEBUG = -g
#LISTING = -ahls

#  Compiler Options
GCFLAGS = -Wall -fno-common -mcpu=cortex-m3 -mthumb -O$(OPTIMIZATION) $(DEBUG)
#GCFLAGS += -Wcast-align -Wcast-qual -Wimplicit -Wpointer-arith -Wswitch
#GCFLAGS += -Wredundant-decls -Wreturn-type -Wshadow -Wunused
LDFLAGS = -mcpu=cortex-m3 -mthumb -O$(OPTIMIZATION) -nostartfiles -Wl,-Map=$(PROJECT).map -T$(LSCRIPT)
ASFLAGS = $(LISTING) -mcpu=cortex-m3

#  Compiler/Assembler/Linker Paths
GCC = arm-none-eabi-gcc
AS = arm-none-eabi-as
LD = arm-none-eabi-ld
OBJCOPY = arm-none-eabi-objcopy
REMOVE = rm -f
SIZE = arm-none-eabi-size

#########################################################################

all:: $(PROJECT).hex $(PROJECT).bin

$(PROJECT).bin: $(PROJECT).elf
	$(OBJCOPY) -O binary -j .text -j .data $(PROJECT).elf $(PROJECT).bin

$(PROJECT).hex: $(PROJECT).elf
	$(OBJCOPY) -R .stack -O ihex $(PROJECT).elf $(PROJECT).hex

$(PROJECT).elf: $(OBJECTS)
	$(GCC) $(LDFLAGS) $(OBJECTS) -o $(PROJECT).elf

stats: $(PROJECT).elf
	$(SIZE) $(PROJECT).elf

clean:
	$(REMOVE) $(OBJECTS)
	$(REMOVE) $(PROJECT).hex
	$(REMOVE) $(PROJECT).elf
	$(REMOVE) $(PROJECT).map
	$(REMOVE) $(PROJECT).bin
	$(REMOVE) $(OBJECTS)

#########################################################################
#  Default rules to compile .c and .cpp file to .o
#  and assemble .s files to .o

.c.o :
	$(GCC) $(GCFLAGS) -c $<

.cpp.o :
	$(GCC) $(GCFLAGS) -c $<

.S.o :
	$(AS) $(ASFLAGS) -o $(PROJECT)_crt.o $< > $(PROJECT)_crt.lst

#########################################################################

Some modifications are necessary:

• Delete the “GROUP(-lgcc -lc -lcs3 -lcs3unhosted -lcs3micro)” line (line 21) from LPC17xx.ld linker script.
• Change “ENTRY(_start)” to “ENTRY(main)” (line 19) in LPC17xx.ld.
• Change “_start” to “main” on line 126 in startup_LPC17xx.s.
• Adjust the sample LED flashing program in main_LPC17xx.c for the mbed pinout: I just changed the FIODIR 0xB0000000 to 0xFFFFFFFF and the LED being turned on from 1«28 to 1«18 (this corresponds to LED1 on the mbed board).

EOF

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