Yevgeny PetrilinShay DanShadi Ibrahim
GUI: Graphical User Interface DAQ:Data Acquisition
Data Acquisition device a self-powered system that communicated with a computer through a standard or
proprietary interface
GPIB General Purpose Interface Bus.
Sweep A continuous change of a parameter in an electronic system. Most often it refers to
a frequency sweep or the sweep of a voltage.
Difference measurements
The main goal was to write a program that can performs Mega sweep using limited types of devices DAQ is the Main device and it is also able to read other devices
input It can generate voltage in a limited range Devices can be configured either manually or via measurement
tool Devices can be connected to each other in a single experiment.
The program should enable : Configuring each device output in the range of [-10:10][V] Controlling the devices while doing the experiment, hence
changing output values. Saving the experiment data into database in a convent format
Programming language: C. OOP principals (ADT). Device Array – pointers to functions. Read/Write settings. Synchronization.
Project RequirementsAnd results
The user should be able to set sweep details: source device, limits, rate (up/down), increment, number of sweeps, details of the participating devices, and units for viewing results.
The user should be able to store/load sweep configuration for anytime reuse.
The user should be able to change the manner of the data graphical presentation at sweep run time.
The user should be able to change sweep rate or direction at run time.
The user should be able to pause/ resume sweep.
The user should be able to stop and reset the sweep.
The application should be able to read input from the DAQ buffer.
The application should support any size of sweep.
The application should synchronize both reading and writing tasks in order to associate data accordingly.
The application can read up to 16 channel's input in regular mode and up to 8 channels in DIFF mode at the same time.
All the experiment’s data should be gathered without any lost, regardless of the size.
Data gathered from the DAQ buffer should be stored in a file using parallel thread.
The application should identify all the connected devices to the pc at run time.
The application should enable to choose the devices participating in the experiment and configure their values.
The application should be able to communicate with the devices listed below; the application should be able to forward write-tasks to these devices.
Application should be able to pause/resume/stop or change the devices state while doing the experiment.
Device Array
DAQ
Dev1
.
.
.
writereadclosepausegoto___________Read stateWrite state
writereadclosepausegoto___________Read stateWrite state
DeviceInterface
CreateDestroySet read stateSet write state
CreateDestroySet read stateSet write state
ADT Interface
Device specific Methods:•write•read•close
Device specific Methods:•write•read•close
Device Specific Interface
The process of adding a device
The Interface for developer usageThe Interface for developer usage
Device Array
DAQ
Dev1
.
.
.
writereadclosepausegoto___________Read stateWrite state
writereadclosepausegoto___________Read stateWrite state
DeviceInterface
Device specific Methods:•write•read•close
Device specific Methods:•write•read•close
Device 1 Specific Interface
Device specific Methods:•write•read•close
Device specific Methods:•write•read•close
Device 2 Specific Interface
DAQ as sweep Source device Source write function instructs main device to write an
array of sequential values in an appropriate range at a given rate
Asynchronous call Runs in main thread Calls a DONE interrupt when the device when DAQ finishes
given write task Done interrupt calls a method that waits until operation
of read and handling its results is done (Plot mainly) Sets the flags for the next iteration in sweep Sets the parameter for read/write in the next iteration Executes the next iteration/ ends sweep
Yokogawa as sweep Source device Source write function instructs main device to write an
array of sequential values in an appropriate range in a given time
Asynchronous call Runs in main thread DONE interrupt is implemented via thread which waits during
given execution time Done interrupt calls a method that waits until operation
of read and handling its results is done (Plot mainly) Sets the flags for the next iteration in sweep Sets the parameter for read/write in the next iteration Executes the next iteration/ ends sweep
• DAQ as sweep Source device Read function initiates DAQ with the
parameters pulled from GUIRead operation is triggered by DAQ write functionRead clock is synchronized with output clock It executes an interrupt function after every N
samples it read from input, each interrupt performs
Plotting results into GUI Calling a thread which writes results into a specified file
• READ IS ALWAYS CALLED BEFORE WRITE
• DAQ is Not the sweep Source device Read function initiates DAQ with the
parameters pulled from GUIRead operation is not triggered, it starts when it is
calledRead clock is synchronized with DAQ onboard clock It executes an interrupt function after every N
samples it read from input, each interrupt performs Plotting results into GUI Calling a thread which writes results into a specified file
• READ IS ALWAYS CALLED BEFORE WRITE
Main interfaceDAQ interface
Read)(
Write)(
Main Thread
Thread Pool
Thread Pool
DatabaseDatabase
Read Interru
pt
Read Interru
pt
Done Interru
pt
Done Interru
pt
Register Done
Worker
Thread
Worker
Thread
Every N samples
Plot graph/save results
Write next iter.
Write
Write is Done, Wait until read + plot is done
1
2
*
Yokogawa interface
Write)(
Write)(
Main interfaceDAQ interface
Read)(
Main Thread
Thread Pool
Thread Pool
DatabaseDatabase
Read Interru
pt
Read Interru
pt
Register EveryN
Worker
Thread
Worker
Thread
Every N samples
Plot graph/save results
Write next iter.
Write
Write is Done, Wait until read + plot is done
1
2
*
Worker
Thread
Sleep duration
Data structure Devices array Additional outputs array (subset of device array) Sweep configuration
• Values taken from GUI• Values set by device interface
• Runtime configuration In order to perform operations during a sweep,
participating devices data will be pulled from settings database
Runtime flags• Sweep direction• Display mode• …
Initiating measurement toolMain Physical Device*
Collect info
Identity info
Device
Create device[info]
Specific Device
Retrieve pointers
Running a sweep with DAQ as source
Main Device write
ok
Device DAQDAQ write
DAQ readDevice read
DAQ done write
Settings
Retrieve Next configurations
Retrieve Sweep configurations
DAQ Handling device as source Retrieving read results from channels
Yokogawa Device as main source Device as additional output
HP Agilent 363xx Device as additional output
Configuring the main sweep source.
Here we set the limitis, the rateand the number of iterations
Configuring the main sweep source.
Here we set the limitis, the rate and the number of iterations
Adding Additional output. Here we define the other devices
that participates the experiment. The devices are selected from
the GPIB device list.
Adding Additional output.Here we define the other devices that participates the experiment.
The devices are selected from the GPIB device list.
Setting the DAQ inputs. We need to Add the data manualy according to the
channels we connected .
Setting the DAQ inputs.We need to Add the data manualy according to the
channels we connected .
Load / save configurations.
Apply settings will send the configurations instructions to the
devices through the GPIB
Load / save configurations.
Apply settings will send the configurations instructions to the
devices through the GPIB
Sweep controls.Start/stop/pause/resume .
Enables changing the rate or theoutput value of the main device.
Sweep controls.Start/stop/pause/resume .
Enables changing the rate or the output value of the main device.
Examining sweep online results:1.Viewing results2.Manipulating graph
Examining sweep online results:1.Viewing results2.Manipulating graph
Physical devices Throughput (Device capabilities VS. PC) Output range (Yoko VS. DAQ)
Software related Programming language restrictions Synchronization overhead
Workspace related Various kinds of platforms : uniform
interface?
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