====== Summmon-arm-toolchain, libopencm and stlink  ======

For the stm32f4 we have to do a cross-compilation, the cross-compiler that we used is summon-arm-toolchain.

 =====  Installing summon-arm-toolchain =====

  * Download it:  

    cd local/src/
    git clone https://github.com/esden/summon-arm-toolchain.git # or --> git clone git://github.com/esden/summon-arm-toolchain.git

  *Install needed dependencies (README):

    sudo apt-get install flex libgmp3-dev libmpfr-dev libncurses5-dev libmpc-dev autoconf texinfo build-essential libftdi-dev


  *If you installed ROS before, then you have to unset some environment variables:

    unset LIBRARY_PATH; unset LD_LIBRARY_PATH; unset CFLAGS; unset LDFLAGS; unset CPATH;   

  * Finally we run the excecutable file> 

    cd ~/local/src/summon-arm-toolchain 
    ./summon-arm-toolchain


 ===== We also used a library called libopencm3 =====

  * Download it

     cd local/src
     git clone git://github.com/libopencm3/libopencm3.git

  * To make it easier to use, we put it in the path:

     nano ~/.bashrc
 
  * In the export PATH add this line:

    ${HOME}/sat/bin:

  * Reload it

    cd ~
    . .bashrc

  * Finally build it:

    cd local/src/libopencm3/
    make


===== Stlink =====

Stlink is going to be use to flash our program

  *Compile and install

    cd ~/local/src
    git clone git://github.com/texane/stlink.git
    cd stlink
    ./autogen.sh
    ./configure --prefix=${HOME}/local/DIR/stlink
    make
    make install
    cd ~/local/DIR
    xstow stlink
        

  * To enable the usb port, we must copy to  files from stlink directory to /etc/udev/rules.d and then restart it

   sudo cp 49-stlinkv1.rules /etc/udev/rules.d/
   sudo cp 49-stlinkv2.rules /etc/udev/rules.d/


===== Example =====

  *  Compiling fancyblink 

    cd ~/local/src/libopencm3/examples/stm32/f4/stm32f4-discovery/fancyblink
    make clean
    make
    st-flash erase #this might not be necessary
    st-flash write fancyblink.bin 0x8000000

**Touch the reset button... and now we can see the fancyblink**

[[ie0117_proyectos:final:stm32f4-discovery:|INDEX]]