Re: [libdc1394-devel] Re: Triggering a pixelink A741 camera

[Aravind S. <ara...@um...>]

hi everybody, thanks for the many suggestions.

johannes, what is the voltage output level for the serial port: can it be
set to 12V? i need a square pulse whose levels are 0V and 12V (maybe > 8V
will do, but not TTL).

i'm trying to avoid external circuitry if possible.

i need to be able to control the frequency, so that rules out the 555 timer=
.


when i tried to use the GetCameraAdvControlRegister() function, the linker
gives an error. i have included the dc1394_register.h file and also the
libdc1394 library. the other dc1394* functions are linked just fine. this
error happens if i use other functions in dc1394_register.c such as
GetCameraROMValue() as well. this error persists even when i directly use
/home/fmccall/src/dc1394-2.0.0-20060207/libdc1394/dc1394_register.o from th=
e
compiled sources.

[fmccall@keck00 pixelink]$ make gpo2
g++ -g -O2 -Wall -I/opt/libdc1394-2.0.0-20060207/include/dc1394 -o gpo2
gpo2.c options.o common.o  -lm -lstdc++  -L/opt/libdc1394-2.0.0-20060207/li=
b/
-L/usr/local/lib -lraw1394 -ldc1394
/tmp/ccIikbKr.o(.text+0xde): In function `main':
/home/fmccall/aravind/pixelink/gpo2.c:55: undefined reference to
`GetCameraAdvControlRegister(__dc1394_camera*, unsigned long long, unsigned
int*)'
collect2: ld returned 1 exit status
make: *** [gpo2] Error 1

[fmccall@keck00 pixelink]$ ls /opt/libdc1394-2.0.0-20060207/lib/
libdc1394.a  libdc1394.la  libdc1394.so  libdc1394.so.20
libdc1394.so.20.0.0

[fmccall@keck00 pixelink]$ g++ -g -O2 -Wall
-I/opt/libdc1394-2.0.0-20060207/include/dc1394
-o gpo2 gpo2.c options.o common.o
/home/fmccall/src/dc1394-2.0.0-20060207/libdc1394/dc1394_register.o
-lm -lstdc++  -L/opt/libdc1394-2.0.0-20060207/lib/ -L/usr/local/lib
-lraw1394 -ldc1394
/tmp/ccMvvI6t.o(.text+0xde): In function `main':
/home/fmccall/aravind/pixelink/gpo2.c:55: undefined reference to
`GetCameraAdvControlRegister(__dc1394_camera*, unsigned long long, unsigned
int*)'
collect2: ld returned 1 exit status

i'll be grateful for any help.

thanks,
aravind.

On 3/19/06, Johann Schoonees <j.s...@ir...> wrote:
>
>
> Aravind Sundaresan wrote:
> > We have 8 pixelink a741 cameras in our lab and would like to trigger
> them
> > synchronously. it is possible to trigger them using one of the cameras
> > themselves (GPO- general purpose output) pins.  i wonder if anybody has
> had
> > any luck using the GPO on the pixelink cameras on linux.
> >
> > Alternatively, does anybody have a PCI based DAC card or something
> similar
> > to produce a square wave of desired frequency and voltage (0-12V) that
> can
> > be set using a C program?
>
> I don't know about using an a741 to generate trigger outputs, but it
> is very easy to make a square wave with your PC.  You don't need a
> DAC.  Just program one of the serial port output control lines (eg.
> DTR) to go up and down periodically.  There is example code in the
> libdc1394 FAQ under the question about measuring latency.
>
> Johann
>
> --
> Johann Schoonees                          Research Engineer
> Industrial Research Ltd, PO Box 2225, Auckland, New Zealand
> Phone +64 9 9203679  Fax +64 9 3028106       www.irl.cri.nz
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--
________________________________________________________________________
Aravind Sundaresan
PhD Candidate
University of Maryland, College Park