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Developing
Add
#define DEBUG 1
to output.h to enable debugging. This will cause all calls to D() in the source code to produce visible output.
The EM software is tested for use with Karpix OS.
The control box has 2 disks, an OS disk, and optional DATA disk. The OS disk contains at least 2 partitions, labelled BOOT and VAR. Boxes with a development environment installed also have a DEV partition. The purpose of these is as follows:
- BOOT is not mounted in a running system. It's used by the bootloader to launch either the development or production EM operating system. It contains a bootloader config at "/grub/grub.conf" and any number of software images, such as /em-X.Y.Z which contain the entire production EM system.
- VAR is a run-time data directory. When a production EM system runs, the root directory (/) is read-only, and is loaded from the image file. Any files that need to be editable in the production system are stored here. The VAR partition is mounted at the /var location.
- DEV is the development environment. It may be used in place of a read-only production image.
/opt - custom software
/opt/em - the EM software
/opt/elog - the Elog software (optional)
/var - the run-time data directory
/var/em - editable EM files, like config.
/var/em/data - backup data storage. data recorded is cached here before flushing to /mnt/data, in case the data disk is missing and for a backup. Only a short period of video is stored here at a time due to space constraints.
/var/elog -
/mnt/data - the data disk mount point, all data recorded is stored here.
/etc/em.conf - the EM system config file. links to /var/em/em.conf in order to be writable.
/etc/systemd/system - startup scripts, which defined dependencies and processes on boot
/tmp/em-state.json - a JSON api that can be read to get the system state from the filesystem any time. Used by the web interface (UI) as well.
Our system uses the ACTI API to configure some settings on digital cameras - ACTI Camera API Guide