How to read and write DOOCS properties with Matlab
If you can not use Python, we recommend to use the Mex function
doocsread with Matlab as installed on our workstations. It works with Matlab R2016b and is installed on flashlxuser1, flashlxuser2, and the GNU/Linux workstations in the FLASH halls (hasfcons0 to hasfcons10 and hasfpg0, hasfpg3).
Please do not use
ttfr et al..
DOOCS ADQ412 ADC Access
To read sample spectra from the SP Devices ADQ412 ADCs there are two servers which could be accessed. The server
SPDEVDMA should only be used for debugging purposes. Don't touch it during data acquisition for an experiment with beamtime. The ADQ scope servers (
ADC.ADQ) are recommended to use for live data access.
Note: To access the ADQ scope servers you might have to set properties, which also affect the recording of samples to the DAQ and the data access of other users. So be careful changing any properties' values.
Currently the number of samples accessible this way is limited to 1,048,575 samples. The code snippet below shows how to read the current spectrum with the maximum number of samples.
%% ADQ Scope Server MTCA FL2-EXP1 % Note CH00.INCR_LOGIC does not do anything % CH00.RAW_COPY must be '1' in order to receive more than 800 values location= 'FLASH.FEL/ADC.ADQ.FL2EXP1/FL2EXP1.CH01/'; errorMsg= doocswrite([location, 'CH00.RAW_COPY'], 1); assert(isempty(errorMsg), 'doocsread error: %s', errorMsg); % read mtcaSpectrumNestedStruct= doocsread([location, 'CH00.RAW_COPY']); assert(isempty(mtcaSpectrumNestedStruct.('error')), ... 'Error: doocsread: ''%s''', mtcaSpectrumNestedStruct.('error')); % unwrap mtcaSpectrumStruct= mtcaSpectrumNestedStruct.('data'); mtcaSpectrum= mtcaSpectrumStruct.('d_spect_array_val'); % create time axis and plot start= mtcaSpectrumStruct.('s_start'); increment= mtcaSpectrumStruct.('s_inc'); sLength= mtcaSpectrumStruct.('d_spect_array_len'); assert(sLength == length(mtcaSpectrum)); spectrumTimeAxis= start : increment : start + increment*(sLength - 1); plot(spectrumTimeAxis, mtcaSpectrum);
Example Matlab scripts
doocsreadbased scripts on the FS-FLASH repository are examples for a Camera and a time-of-flight GUI. The layout and functionality are attached:
- Examples how to read pulse train synchronous values using
doocsreadare available on DESY's Bitbucket project to evaluate pulse synchronous access
jdoocs_call (deprecated, unmaintained)
We strongly suggest not to use the M-function `jdoocs_call`. It has been deprecated since 2014 and has not been maintained since then. The files below are kept for reference only. In many cases they won't work any longer.
In the attachment a collection of old files can be found:
- in the jDOOCS zip:
- the *.jar files for the Java DOOCS implementation and its dependencies
- the jdoocs_call.m function which eases the jDOOCS handling and can be used to read numbers and Vectors (spectra ... 1D data)
- a sample program to read 0D (numbers) and 1D (spectra) data with jdoocs_call (jDOOCS_read_sample_0D_and_1D.m)
- a sample program to read 2D (images) (jDOOCS_read_sample_2D.m)