I finished the installation of EPICS base on Raspberry Pi (domenica:  /opt/epics). I tested it by creating a test SoftIoc (controls@domenica~/freqCountIOC/simple.db) and was able to read from the channel on Chiara.

Now  I am looking into how to call my C code that talks to Raspberry Pi through a  .db script and write  it into the assigned channel. 

For installation I had to make these declarations in the environment (~/.bash_aliases):

export EPICS_EXT=${EPICS_ROOT}/extensions
export EPICS_EXT_BIN=${EPICS_EXT}/bin/${EPICS_HOST_ARCH}
export EPICS_EXT_LIB=${EPICS_EXT}/lib/${EPICS_HOST_ARCH}
if [ "" = "${LD_LIBRARY_PATH}" ]; then
    export LD_LIBRARY_PATH=${EPICS_EXT_LIB}
else
    export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${EPICS_BASE_LIB}
fi
export PATH=${PATH}:${EPICS_EXT_BIN}