Hardware

PL2303HX USB Serial To RS232 TTL Chip

2.5 mm audio jack

Motorola C118 (E88)

L (Left Signal) Tip 1 Green R (Right Signal) Ring 2 Red GND (Ground) Sleeve 3 Bare Copper

USB Serial To RS232 TTL Chip, whereas

TxD is at the tip of the plug

RxD is at the middle contact

GND is the outer contact

Software

dmesg | grep tty user@user:~$ dmesg | grep tty [ 0.000000] console [tty0] enabled [ 6522.143379] usb 3-2: pl2303 converter now attached to ttyUSB0

sudo adduser user dialout sudo chmod a+rw /dev/ttyUSB0 sudo cu -l /dev/ttyUSB0 -s 115200

Compiling OsmocomBB

Compiling GNU ARM toolchain

Ensure you add the path of arm-elf-gcc using export (check in shell: arm-elf-gcc).

This is absolutely vital as failure to do so will yield you errors when trying to compile osmocom

later on.

mkdir gnuarm cd gnuarm wget http://bb.osmocom.org/trac/raw-attachment/wiki/GnuArmToolchain/gnu-arm-build.2.sh chmod +x gnu-arm-build.2.sh sudo apt-get install build-essential libgmp3-dev libmpfr-dev libx11-6 libx11-dev texinfo flex bison libncurses5 \ libncurses5-dbg libncurses5-dev libncursesw5 libncursesw5-dbg libpcsclite-dev libncursesw5-dev zlibc zlib1g-dev libmpfr4 libmpc-dev aptitude sudo aptitude install libtool shtool automake autoconf git-core pkg-config make gcc mkdir build install src cd src/ wget http://ftp.gnu.org/gnu/gcc/gcc-4.5.2/gcc-4.5.2.tar.bz2 wget http://ftp.gnu.org/gnu/binutils/binutils-2.21.1a.tar.bz2 wget ftp://sources.redhat.com/pub/newlib/newlib-1.19.0.tar.gz cd .. ./gnu-arm-build.2.sh export PATH=$PATH:/home/user/gnuarm/install/bin

Compiling libosmocore

git clone git://git.osmocom.org/libosmocore.git cd libosmocore/ autoreconf -i ./configure make sudo make install

Compiling osmocomBB

git clone git://git.osmocom.org/osmocom-bb.git cd osmocom-bb git pull --rebase cd src make

OsmocomBB Hello world!

cd ~/osmocom-bb/src/host/osmocon/ ./osmocon -p /dev/ttyUSB0 -m c123xor ../../target/firmware/board/compal_e88/hello_world.compalram.bin

Loading RSSI

sudo ./osmocon -d tr -p /dev/ttyUSB0 -m c123xor -c ../../target/firmware/board/compal_e88/rssi.highram.bin

OsmocomBB is an Open Source GSM Baseband software implementation. By using the sofware on a compatible phone (e.g. Motorola C118), you are able to make and receive phone calls, send and receive SMS, etc. based on Free Software only.This is a typical pin-out of a 2.5 mm audio jack:You need to soldier the 2.5mm audio jack to theConnect the phone to your PC and check if it is being recognized.To make sure everything is working, install cu and connect at 115200 baud. Permissions need to be set correctly, otherwise you will run into this error: "Cannot open /dev/ttyUSB0: Permission denied".Assuming the phone is switched off, press the power button and cu should display, which means you are ready to go!Plug everything in, switch phone off, run command and press the phone's power button.