APFEL/HV raspberry pi

Stand: 18/8/2021

• Start with a raspbian image
• Set up a user with username: pi, and password: standard agmaas password
• To enable the I2C bus and set the correct frequency, uncomment the following line from /boot/config.txt

dtparam=i2c_arm=on

and modify it to

dtparam=i2c_arm=on,i2c_arm_baudrate=400000

• Create a directory /home/pi/apfel_dev
• In that directory clone the following repositories
  • https://gitlab.rlp.net/emp/apfel_interface
  • https://gitlab.rlp.net/emp/hv_control
• Compile with make both repositories
• Add the following lines to /etc/rc.local

/home/pi/apfel_dev/hv_control/start_hv.sh
/home/pi/apfel_dev/apfel_interface/scripts/start_apfel.sh

• Add the following lines to /home/pi/.bashrc

HVDIR=$HOME/apfel_dev/hv_control
APFELDIR=$HOME/apfel_dev/apfel_interface

alias watch_hv='$HVDIR/watch_hv.sh'
alias start_hv='$HVDIR/start_hv.sh'
alias watch_apfel='$APFELDIR/scripts/watch_apfel.sh'
alias start_apfel='$APFELDIR/scripts/start_apfel.sh'

• Reboot the pi to see if everything worked. On startup, the APFEL and HV control programs should be started

• Through the aliases watch_hv and watch_apfel, it is possible to see the output of the respective servers. The log files to which the servers write to are:

/home/pi/apfel_dev/hv_control/hvlog.{out,err}
/home/pi/apfel_dev/apfel_interface/apfellog.{out,err}

• The servers can be killed and restarted through the aliases start_hv and start_apfel.
• Without arguments, the scripts check if there are running server processes and if so exit with an output like:

n. of server processess: 2
n. of watch processess: 2
processes running, kill first

• To kill the processes, call the aliases with the argument -kill (e.g. start_hv -kill).
• Only for start_apfel, it is possible to start the server with the verbose flag set by invoking the alias with start_apfel -v.