Matrix Vision mvBlueLYNX-X, Техническое руководство, Страница: 96 / 236

Now start the X application e.g. wxPropView or
LiveSnapFLTK -sLX* -pMono8
6.
mvBlueLYNX-X - XForwarding on Windows
11.8 FTP
By default , the mvBlueLYNX-X provides ftp connections with SSH encryption (pre-installed ipk package
openssh-sftp-server
).
However, if you want to use another ftp server like vsftpd, you install the ipk package like this (with sensible
defaults):
opkg install vsftpd
The configuration file (with comments) will be found at
/etc/vsftpd.conf
. The new directories
/var/lib/ftp/
and
/var/lib/ftp/in
will be created and the server started. Full documentation of
the configuration options may be found at the vsftpd website.
11.9 CPU throttling policy
By default , when the camera is idle, the CPU frequency automatically steps down to 300 MHz. When the
CPU is heavily used, the CPU frequency will automatically increase in steps up to 1GHz.
If the performance of the camera is not a limiting factor and the small delay involved in the automatic
changeover of CPU frequency does not adversely affect your application we recommend leaving the default
CPU throttling scheme unchanged in order to save power and prolong the life of the components.
Otherwise, you may change the CPU throttling policy if your application requires a constant CPU frequency.
For this, you can use the CPU frequency widget in the toolbar on the desktop or you can use the following
commands in a terminal or console:
opkg install cpufrequtils
cpufreq-set -f 1GHz
cpufreq-set -g performance
Possible frequency values are
300MHz
,
600MHz
,
800MHz
and
1GHz
(or
1000MHz
).
You can copy the above lines to a new file within the directory
/etc/profile.d/
e.g.
echo "cpufreq-set -f 1000MHz" > /etc/profile.d/cpu-freq.sh
echo "cpufreq-set -g performance" >> /etc/profile.d/cpu-freq.sh
chmod +x /etc/profile.d/cpu-freq.sh
Now your camera will always run at 1GHz after booting.
If you are running performance tests or benchmarks don't forget to fix the CPU frequency to the
maximum of 1GHz before testing!
11.9.1 Green Automation!
The following table gives approximate power consumption values for a mvBlueLYNX-X100wG camera
when
wxPropView
is running, images are being captured and also displayed (i.e. at high CPU load). It
shows power consumption differences of up to approx. 0.6 W depending on the CPU frequency.
mvBlueLYNX-X Technical Manual
86 22 April 2016 Version - 1.49 MATRIX VISION GmbH