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From the mbed microcontroller Handbook.  

Exporting to GCC ARM Embedded

Support

Please note, changing the compiler toolchain introduces many degrees of freedom in the system; these differences include the translation of C/C++ code to assembly code, the link time optimizations, differences because of the implementations of the C standard libraries, and differences based on compile and link options. It also makes it a lot harder to share code and questions with other developers, as the context needs to be shared too!

Whilst we support exporting your project and the libraries to an alternate toolchain, we cannot guarantee the same consistency as using the mbed Online Compiler. We will do our best to maintain the exported libraries, project file and makefiles, but please understand we can not cover all cases, combinations or provide support for use of these alternate tools themselves!

GNU Tools for ARM Embedded Processors is one of the external offline toolchains supported by the mbed platform.

For a complete overview of the "export" feature, please refer to our general: Exporting to offline toolchains.

To export your mbed program for use with the GNU Tools for ARM Embedded Processors, right-click the program in your program workspace. From the dialog, you can select the "Export To" as "GCC (ARM Embedded)", and the target microcontroller you wish to export for.

/media/uploads/emilmont/gcc_arm.png

When you choose export, a zip file containing all the files you need for the GNU Tools for ARM Embedded Processors will be generated. Unzip it and you are ready to launch make:

GCC_ARM

my_program$ ls
main.cpp  Makefile  mbed  mbed.lib

my_program$ make
arm-none-eabi-g++ -c -Os -fno-common -fmessage-length=0 -Wall -fno-exceptions -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections  -DTARGET_LPC1768 -DTOOLCHAIN_GCC_ARM -DNDEBUG -std=gnu++98 -I./mbed -I./mbed/LPC1768 -I./mbed/LPC1768/GCC_ARM  -o main.o main.cpp
arm-none-eabi-gcc -mcpu=cortex-m3 -mthumb -Wl,--gc-sections -Tmbed/LPC1768/GCC_ARM/LPC1768.ld -L./mbed -L./mbed/LPC1768 -L./mbed/LPC1768/GCC_ARM  -o my_program.elf main.o mbed/LPC1768/GCC_ARM/startup_LPC17xx.o mbed/LPC1768/GCC_ARM/core_cm3.o mbed/LPC1768/GCC_ARM/system_LPC17xx.o mbed/LPC1768/GCC_ARM/cmsis_nvic.o -lmbed -lcapi -lstdc++ -lsupc++ -lm -lc -lgcc
arm-none-eabi-objcopy -O binary my_program.elf my_program.bin

my_program$ ls
main.cpp  main.o  Makefile  mbed  mbed.lib  my_program.bin  my_program.elf

The binary file (".bin") is ready to be flashed on the mbed.



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Last modified 2 weeks, 6 days ago, by   user Emilio Monti   tag No tags | 6 comments      

6 comments on Exporting to GCC ARM Embedded:

user Roman Kuzmin
19 Jan 2012

Thank you, good news.

user robert bouwens
20 Jan 2012

works great! use since a couple of days. use it within the lpcxresso ide.

user Rob Jansen
2 weeks, 3 days ago

I've just exported my little hello project with just one bliking LED to GCC ARM. Surprizingly the original 5 kB .bin image now becomes an astonishing 64 kB binary.

This will never help me to "move my prototype in to production".

Tried both the "GNU Tools for ARM Embedded Processors" and LPCXpresso with the same result.

I think we also need access to the optimized C++ libraries that mBed uses for this to be usefull.

user Emilio Monti
2 weeks, 3 days ago

Hi Rob,

user Rob Jansen wrote:

I've just exported my little hello project with just one bliking LED to GCC ARM. Surprisingly the original 5 kB .bin image now becomes an astonishing 64 kB binary. Tried both the "GNU Tools for ARM Embedded Processors" and LPCXpresso with the same result.

This is mainly due to the size of GNU "newlib". There is ongoing effort to optimize "newlib" size for embedded targets.

user Rob Jansen wrote:

I think we also need access to the optimized C++ libraries that mBed uses for this to be useful.

The libraries used by mbed are available with the ARM MDK. You can get a free evaluation here: https://www.keil.com/demo/eval/arm.htm

HTH, Emilio

user E B
6 days, 1 hour ago

There is no option in the online compiler to export to "GCC (Arm Embedded)", the closest is "GCC (Code Sourcery)", is that the same thing or not?

user Emilio Monti
6 days, 1 hour ago

user E B wrote:

There is no option in the online compiler to export to "GCC (Arm Embedded)", the closest is "GCC (Code Sourcery)", is that the same thing or not?

No, it is not the same thing. Unfortunately, this is a regression. I'll notify the issue. The "GCC (Arm Embedded)" export should be back soon.

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