pico Technology PicoScope 2000 Series Manual

Copyright © 2006-2011 Pico Technology Ltd. All rights reserved.
PicoScope 2000 Series
Programmer's Guide
ps2000pg.en-4
PC Oscilloscopes

IPicoScope 2000 Series Programmer's Guide
Copyright © 2006-2011 Pico Technology Ltd. All rights reserved. ps2000pg.en
Contents
.....................................................................................................................................11 Introduction
...........................................................................................................................................1
1 Overview
...........................................................................................................................................1
2 Licence conditions
...........................................................................................................................................1
3 Trademarks
...........................................................................................................................................2
4 Warranty
...........................................................................................................................................2
5 Company details
.....................................................................................................................................32 Installation
...........................................................................................................................................3
1 Minimum system requirements
...........................................................................................................................................3
2 Installation instructions
.....................................................................................................................................43 Technical information
...........................................................................................................................................4
1 Driver
...........................................................................................................................................4
2 Programming overview
...........................................................................................................................................4
3 Device features
...........................................................................................................................................4
1 AC/DC coupling
...........................................................................................................................................4
2 Voltage ranges
...........................................................................................................................................5
3 Oversampling
...........................................................................................................................................5
4 Scaling
...........................................................................................................................................5
5 Signal generator
...........................................................................................................................................5
6 Triggering
...........................................................................................................................................6
7 Combining oscilloscopes
...........................................................................................................................................6
8 Sampling modes
...........................................................................................................................................11
4 Programming examples
...........................................................................................................................................11
1 C
...........................................................................................................................................12
2 Visual Basic
...........................................................................................................................................12
3 Delphi
...........................................................................................................................................12
4 Excel
...........................................................................................................................................12
5 Agilent VEE
...........................................................................................................................................12
6 LabVIEW
...........................................................................................................................................13
5 Functions
...........................................................................................................................................13
1 Introduction
...........................................................................................................................................14
2 ps2000_close_unit
...........................................................................................................................................15
3 ps2000_flash_led
...........................................................................................................................................16
4 ps2000_get_streaming_last_values
...........................................................................................................................................17
5 ps2000_get_streaming_values
...........................................................................................................................................19
6 ps2000_get_streaming_values_no_aggregation
...........................................................................................................................................21
7 ps2000_get_timebase
...........................................................................................................................................22
8 ps2000_get_times_and_values
...........................................................................................................................................24
9 ps2000_get_unit_info
...........................................................................................................................................25
10 ps2000_get_values
...........................................................................................................................................26
11 ps2000_last_button_press
...........................................................................................................................................27
12 ps2000_open_unit
...........................................................................................................................................28
13 ps2000_open_unit_async
...........................................................................................................................................29
14 ps2000_open_unit_progress
...........................................................................................................................................30
15 ps2000_overview_buffer_status
...........................................................................................................................................31
16 ps2000_ready
...........................................................................................................................................32
17 ps2000_run_block
...........................................................................................................................................33
18 ps2000_run_streaming

ContentsII
Copyright © 2006-2011 Pico Technology Ltd. All rights reserved.ps2000pg.en
...........................................................................................................................................34
19 ps2000_run_streaming_ns
...........................................................................................................................................35
20 ps2000SetAdvTriggerChannelConditions
...........................................................................................................................................37
21 ps2000SetAdvTriggerChannelDirections
...........................................................................................................................................38
22 ps2000SetAdvTriggerChannelProperties
...........................................................................................................................................40
23 ps2000SetAdvTriggerDelay
...........................................................................................................................................41
24 ps2000_set_channel
...........................................................................................................................................42
25 ps2000_set_ets
...........................................................................................................................................43
26 ps2000_set_light
...........................................................................................................................................44
27 ps2000_set_led
...........................................................................................................................................45
28 ps2000SetPulseWidthQualifier
...........................................................................................................................................47
29 ps2000SetSigGenArbitrary
...........................................................................................................................................49
30 ps2000SetSigGenBuiltIn
...........................................................................................................................................51
31 ps2000_set_trigger
...........................................................................................................................................52
32 ps2000_set_trigger2
...........................................................................................................................................53
33 ps2000_stop
...........................................................................................................................................54
34 my_get_overview_buffers
...........................................................................................................................................55
6 Driver error codes
.....................................................................................................................................564 Glossary
..............................................................................................................................................59
Index

PicoScope 2000 Series Programmer's Guide 1
Copyright © 2006-2011 Pico Technology Ltd. All rights reserved. ps2000pg.en
1 Introduction
1.1 Overview
The PicoScope 2000 series PC Oscilloscopes are low-cost , high-performance
instruments that are fully USB 2.0-capable and also backwards-compatible with USB
1.1. There is no need for an additional power supply, as power is taken from the USB
port.
This manual is for programmers intending to write their own software using the
PicoScope 2000 series API (Application Programming Interface). The scopes are also
supplied with ready-to-use programs called PicoScope and PicoLog, which include their
own on-line User's Guides.
Please read the important information in this introductory section and then proceed to
the Installation instructions.
1.2 Licence conditions
The material contained in this release is licensed, not sold. Pico Technology Limited
grants a licence to the person who installs this software, subject to the conditions
listed below.
Access. The licensee agrees to allow access to this software only to persons who have
been informed of these conditions and agree to abide by them.
Usage. The software in this release is for use only with Pico products or with data
collected using Pico products.
Copyright. Pico Technology claims the copyright of, and retains the rights to, all
material (software, documents etc.) contained in this release. You may copy and
distribute the entire release in its original state, but must not copy individual items
within the release other than for backup purposes.
Liability. Pico Technology and its agents shall not be liable for any loss, damage or
injury, howsoever caused, related to the use of Pico Technology equipment or
software, unless excluded by statute.
Fitness for purpose. Because no two applications are the same, Pico Technology
cannot guarantee that its equipment or software is suitable for a given application. It
is your responsibility, therefore, to ensure that the product is suitable for your
application.
Mission-critical applications. This software is intended for use on a computer that
may be running other software products. For this reason, one of the conditions of the
licence is that it excludes usage in mission-critical applications; for example, life-
support systems.
1.3 Trademarks
Pico Technology Limited, PicoLog and PicoScope are internationally registered
trademarks.
Delphi is a registered trademark of Borland Software Corporation.
LabView is a registered trademark of National Instruments Corporation.
Pentium is a registered trademark of Intel Corporation.
VEE is a registered trademark of Agilent Technologies.
Windows, Excel and Visual Basic are registered trademarks of Microsoft
Corporation.

Introduction2
Copyright © 2006-2011 Pico Technology Ltd. All rights reserved.ps2000pg.en
1.4 Warranty
Pico Technology warrants upon delivery, and for a period of 24 months unless
otherwise stated from the date of delivery, that the Goods will be free from defects in
material and workmanship.
Pico Technology shall not be liable for a breach of the warranty if the defect has been
caused by fair wear and tear, wilful damage, negligence, abnormal working conditions
or failure to follow Pico Technology's spoken or written advice on the storage,
installation, commissioning, use or maintenance of the Goods or (if no advice has
been given) good trade practice; or if the Customer alters or repairs such Goods
without the written consent of Pico Technology.
1.5 Company details
Address:
Pico Technology
James House
Colmworth Business Park
ST. NEOTS
Cambridgeshire
PE19 8YP
United Kingdom
Phone:
[phone]
Fax:
[phone]
Email:
Technical Support:
[email protected]
Sales:
[email protected]
Web site:
www.picotech.com

PicoScope 2000 Series Programmer's Guide 3
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2 Installation
2.1 Minimum system requirements
For the PicoScope 2000 series PC Oscilloscope to operate correctly, a computer with
the minimum system requirements to run Windows or the following (whichever is the
higher specification) is required:
Item
Absolute
minimum
Recommended
minimum
Recommended
full specification
Operating system
Windows XP SP2 or later, Vista or 7
32-bit or 64-bit version
Processor
As required
by Windows
300 MHz
1 GHz
Memory
256 MB
512 MB
Free disk space
(Note 1)
1 GB
2 GB
Ports
USB 1.1 compliant port
USB 2.0 compliant port
Note 1: The PicoScope software does not use all the disk space specified in the table.
The free space is required to make Windows run efficiently.
2.2 Installation instructions
Important
Do not connect the PC Oscilloscope to your PC until you have installed the software.
Install the software by following the steps in the printed Installation Guide supplied
with your oscilloscope. You must install the PicoScope 6 PC Oscilloscope software
even if you do not intend to use it, as it includes the driver and API DLL that you
will need to write your own software.
Connect the oscilloscope's USB port to the PC using the USB cable supplied. There
is no need for an additional power supply, as the oscilloscope obtains its power
from the PC.
Checking the installation
Once you have installed the software, ensure that the oscilloscope is connected to the
PC and then start the PicoScope software. PicoScope should show a small 50 Hz or
60 Hz mains signal in the oscilloscope window when you touch the probe tip with your
finger.

Technical information4
Copyright © 2006-2011 Pico Technology Ltd. All rights reserved.ps2000pg.en
3 Technical information
3.1 Driver
Important
You must install the PicoScope software, which includes the driver for the
PicoScope 2000 Series PC Oscilloscope, before plugging the oscilloscope into
your computer for the first time.
(If you do plug in an oscilloscope before installing the driver, Windows will designate
the device as Unknown . You will then need to manually delete the device using the
Device Manager before you can install the correct driver.)
The Windows XP/Vista/7 32-bit driver, picopp.sys, is installed under the control of
an information file, picopp.inf.
Once you have installed the PicoScope software, Windows will automatically install the
driver when you plug in the oscilloscope for the first time.
3.2 Programming overview
The ps2000.dll library in your PicoScope installation directory allows you to
program a PicoScope 2000 Series oscilloscope using standard C function calls.
A typical program for capturing data consists of the following steps:
Open the oscilloscope.
Set up the input channels with the required voltage ranges and coupling mode.
Set up triggering.
Start capturing data. (See Sampling modes, where programming is discussed in
more detail.)
Wait until the oscilloscope is ready.
Copy data to a buffer.
Stop capturing data.
Close the oscilloscope.
Numerous sample programs are installed with your PicoScope software, if you select
this option during installation. These show how to use the functions of the driver
software in each of the modes available.
3.3 Device features
3.3.1 AC/DC coupling
Using the ps2000_set_channel() function, each channel can be set to either AC or DC
coupling. When AC coupling is used, any component of the signal below about 1 Hz is
filtered out.
3.3.2 Voltage ranges
It is possible to set the gain for each channel with the ps2000_set_channel() function.
The input voltage ranges available depend on which type of oscilloscope is
connected.

PicoScope 2000 Series Programmer's Guide 5
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3.3.3 Oversampling
When the oscilloscope is operating at sampling rates less than the maximum, it is
possible to oversample. Oversampling is taking more than one measurement during
a time interval and returning an average. If the signal contains a small amount of
noise, this technique can increase the effective vertical resolution of the oscilloscope
by the amount given by the equation below:
Increase in resolution (bits) = (log oversample) / (log 4)
Applicability
Available in block mode only.
3.3.4 Scaling
The driver normalises all readings to 16 bits, regardless of the vertical resolution of
the oscilloscope. The following table shows the relationship between the reading from
the driver and the signal level.
Constant
Reading
Voltage
PS2000_LOST_DATA
-32 768
Indicates a buffer overrun in fast streaming
mode.
PS2000_MIN_VALUE
-32 767
Negative full scale
0
0
Zero volts
PS2000_MAX_VALUE
32 767
Positive full scale
3.3.5 Signal generator
The PicoScope 2203, 2204 and 2205 PC Oscilloscopes have a built-in signal
generator which is set up using ps2000SetSigGenBuiltIn().
Applicability
PicoScope 2203, 2204 and 2205 oscilloscopes only.
3.3.6 Triggering
PicoScope 2000 Series PC Oscilloscopes can either start collecting data immediately,
or be programmed to wait for a trigger event to occur. In both cases you need to use
the ps2000_set_trigger() function or (for scopes that support advanced triggering)
the ps2000SetAdvTriggerChannelConditions() function. A trigger event can occur on
any of the conditions available in the simple and advanced triggering modes.
Applicability
Available in block mode and fast streaming mode only. Calls to the
ps2000_set_trigger() and ps2000SetAdvTriggerChannelConditions
() functions have no effect in compatible streaming mode.

Technical information6
Copyright © 2006-2011 Pico Technology Ltd. All rights reserved.ps2000pg.en
3.3.7 Combining oscilloscopes
The 2000 Series driver can collect data from up to 64 PicoScope 2000 Series PC O
scilloscopes at the same time. Each oscilloscope must be connected to a separate USB
port. If a USB hub is used it must be a powered hub.
To begin, call ps2000_open_unit() to obtain a handle for each oscilloscope. All the
other functions require this handle for oscilloscope identification. For example, to
collect data from two oscilloscopes at the same time:
handle1 = ps2000_open_unit()
handle2 = ps2000_open_unit()
ps2000_set_channel(handle1)
... set up unit 1
ps2000_run_block(handle1)
ps2000_set_channel(handle2)
... set up unit 2
ps2000_run_block(handle2)
ready = FALSE
while not ready
ready = ps2000_ready(handle1)
ready &= ps2000_ready(handle2)
ps2000_get_values(handle1)
ps2000_get_values(handle2)
It is not possible to synchronise the collection of data between multiple 2000 Series
oscilloscopes.
3.3.8 Sampling modes
3.3.8.1 Introduction
PicoScope 2000 Series PC Oscilloscopes can run in various sampling modes.
Block mode. At the highest sampling rates, the oscilloscope collects data much
faster than a PC can read it. In this case, the oscilloscope stores a block of data in
an internal memory buffer, delaying transfer to the PC until the required number of
data points have been sampled.
Streaming modes. At all but the highest sampling rates, these modes allow
accurately timed data to be transferred back to the PC without gaps. The computer
instructs the oscilloscope to start collecting data. The oscilloscope then transfers
data back to the PC without storing it in its own memory, so the size of the data
set is limited only by the size of the PC's memory. Sampling intervals from less
than one microsecond to 60 seconds are possible. There are two streaming modes:
Compatible streaming mode
Fast streaming mode

PicoScope 2000 Series Programmer's Guide 7
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3.3.8.2 Block mode
In block mode, the computer prompts the oscilloscope to collect a block of data in its
internal memory. When the oscilloscope has collected the whole block, it signals that
it is ready and then transfers the whole block to the computer's memory through the
USB port.
The maximum number of values depends upon the size of the oscilloscope's memory.
A PicoScope 2000 Series oscilloscope can sample at a number of different rates that
correspond to the maximum sampling rate divided by 1, 2, 4, 8 and so on.
There is a separate memory buffer for each channel. When a channel is unused, its
memory can be borrowed by the enabled channels. This feature is handled
transparently by the driver.
The driver normally performs a number of setup operations before collecting each
block of data. This can take up to 50 milliseconds. If it is necessary to collect data with
the minimum time interval between blocks, avoid calling setup functions between calls
to ps2000_run_block(), ps2000_ready(), ps2000_stop() and ps2000_get_values().
See Using block mode for programming details.
3.3.8.3 Using block mode
This is the general procedure for reading and displaying data in block mode:
1. Open the oscilloscope using ps2000_open_unit().
2. Select channel ranges and AC/DC coupling using ps2000_set_channel().
3. Using ps2000_set_trigger(), set the trigger if required.
4. Using ps2000_get_timebase(), select timebases until you locate the required
time interval per sample.
5. Start the oscilloscope running using ps2000_run_block().
6. Wait until the oscilloscope says it is ready using ps2000_ready().
7. Transfer the block of data from the oscilloscope using ps2000_get_values() or
ps2000_get_times_and_values().
8. Display the data.
9. Repeat steps 5 to 8.
10. Stop the oscilloscope using ps2000_stop().

Technical information8
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3.3.8.4 ETS (Equivalent Time Sampling)
ETS is a way of increasing the effective sampling rate when working with repetitive
signals. It is controlled by the ps2000_set_trigger() and ps2000_set_ets() functions.
ETS works by capturing many instances of a repetitive waveform, then combining
them to produce a composite waveform that has a higher effective sampling rate than
the individual instances. The maximum effective sampling rates that can be achieved
with this method are listed in the Specifications table for your oscilloscope.
Because of the high sensitivity of ETS mode to small time differences, you must set up
the trigger to provide a stable waveform that varies as little as possible from one
capture to the next.
Applicability
Block mode only.
PicoScope 2104, 2105, 2203, 2204 and 2205 oscilloscopes.
As ETS returns random time intervals, the
ps2000_get_times_and_values() function must be used. The
ps2000_get_values() function will return FALSE (0).
Stable, repetitive signals only.
3.3.8.5 Using ETS mode
This is the general procedure for reading and displaying data in ETS mode:
1. Open the oscilloscope using ps2000_open_unit().
2. Select channel ranges and AC/DC switches using ps2000_set_channel().
3. Using ps2000_set_trigger(), set the trigger if required.
4. Set ETS mode using ps2000_set_ets().
5. Start the oscilloscope running using ps2000_run_block().
6. Wait until the oscilloscope says it is ready using ps2000_ready().
7. Transfer the block of data from the oscilloscope using
ps2000_get_times_and_values().
8. Display the data.
9. Repeat steps 6 to 8 as necessary.
10. Stop the oscilloscope using ps2000_stop().

PicoScope 2000 Series Programmer's Guide 9
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3.3.8.6 Streaming mode
Streaming mode is an alternative to block mode that can capture data without gaps
between blocks.
In streaming mode, the computer prompts the oscilloscope to start collecting data.
The data is then transferred back to the PC without being stored in the oscilloscope's
memory. Data can be sampled with a period between 1 µs or less and 60 s, and the
maximum number of samples is limited only by the amount of free space on the PC's
hard disk.
There are two varieties of streaming mode:
Compatible streaming mode
Fast streaming mode
3.3.8.7 Compatible streaming mode
Compatible streaming mode is a basic streaming mode that works at speeds from
one sample per minute to a thousand samples per second.
The oscilloscope's driver transfers data to a computer program using either normal or
windowed mode. In normal mode, any data collected since the last data transfer
operation is returned in its entirety. Normal mode is useful if the computer program
requires fresh data on every transfer. In windowed mode, a fixed number of samples
is returned, where the oldest samples may have already been returned before.
Windowed mode is useful when the program requires a constant time period of data.
Once the oscilloscope is collecting data in streaming mode, any setup changes (for
example, changing a channel range or AC/DC setting) will cause a restart of the data
stream. The driver can buffer up to 32 K samples of data per channel, but the user
must ensure that the ps2000_get_values() function is called frequently enough to
avoid buffer overrun.
See Using compatible streaming mode for programming details.
Applicability
Not available on PicoScope 2203, 2204 or 2205.
Does not support triggering.
The ps2000_get_times_and_values() function always returns FALSE
(0) in streaming mode.
3.3.8.8 Using compatible streaming mode
This is the general procedure for reading and displaying data in compatible streaming
mode:
1. Open the oscilloscope using ps2000_open_unit().
2. Select channel ranges and AC/DC switches using ps2000_set_channel().
3. Start the oscilloscope running using ps2000_run_streaming().
4. Transfer the block of data from the oscilloscope using ps2000_get_values().
5. Display the data.
6. Repeat steps 4 and 5 as necessary.
7. Stop the oscilloscope using ps2000_stop().

Technical information10
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3.3.8.9 Fast streaming mode
Fast streaming mode is an advanced streaming mode that can transfer data at
speeds of a million samples per second or more, depending on the computer's
performance. This makes it suitable for high-speed data acquisition, allowing you
to capture very long data sets limited only by the computer's memory.
Fast streaming mode also provides data aggregation, which allows your application to
zoom in and out of the data with the minimum of effort.
Applicability
PicoScope 2203, 2204 and 2205 only.
Works with triggering.
See Using fast streaming mode for programming details.
3.3.8.10 Using fast streaming mode
This is the general procedure for reading and displaying data in fast streaming mode:
1. Open the oscilloscope using ps2000_open_unit().
2. Select channel ranges and AC/DC switches using ps2000_set_channel().
3. Set the trigger using ps2000_set_trigger().
4. Start the oscilloscope running using ps2000_run_streaming_ns().
5. Get a block of data from the oscilloscope using
ps2000_get_streaming_last_values().
6. Display or process the data.
7. If required, check for overview buffer overruns by calling
ps2000_overview_buffer_status().
8. Repeat steps 5 to 7 as necessary or until auto_stop is TRUE.
9. Stop fast streaming using ps2000_stop().
10. Retrieve any part of the data at any time scale by calling
ps2000_get_streaming_values().
11. If you require raw data, retrieve it by calling
ps2000_get_streaming_values_no_aggregation().
12. Repeat steps 10 to 11 as necessary.
13. Close the oscilloscope by calling ps2000_close_unit().

PicoScope 2000 Series Programmer's Guide 11
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3.4 Programming examples
3.4.1 C
There are two C example programs: a simple GUI application, and a more
comprehensive console mode program that demonstrates all of the facilities of the
driver.
GUI example
The GUI example program is a generic Windows application - that is, it does not use
Borland AppExpert or Microsoft AppWizard. To compile the program, create a new
project for an Application containing the following files:
ps2000.c
resource.h
and
ps2000bc.lib (Borland 32-bit applications)
or ps2000.lib (Microsoft Visual C 32-bit applications)
The following files must be in the compilation directory:
ps2000.rch
ps2000.h
and the following file must be in the same directory as the executable.
ps2000.dll
Console example
The console example program is also a generic Windows application - that is, it does
not use Borland AppExpert or Microsoft AppWizard. To compile the program, create a
new project for an Application containing the following files:
ps2000con.c
and
ps2000bc.lib (Borland 32-bit applications)
or ps2000.lib (Microsoft Visual C 32-bit applications).
The following files must be in the compilation directory:
ps2000.h
and the following file must be in the same directory as the executable.
ps2000.dll

Technical information12
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3.4.2 Visual Basic
The Examples subdirectory contains the following files:
ps2000.vbp - project file
ps2000.bas - procedure prototypes
ps2000.frm - form and program
Note: the functions that return a TRUE/FALSE value return 0 for FALSE and 1 for
TRUE, whereas Visual Basic expects 65 535 for TRUE. To avoid this problem, check for
> 0 rather than = TRUE.
3.4.3 Delphi
The program ps2000.dpr demonstrates how to operate PicoScope 2000 Series PC
Oscilloscopes. The file ps2000.inc contains procedure prototypes that you can
include in your own programs. Other required files include:
ps2000.res
ps2000fm.dfm
ps2000fm.pas
This has been tested with Delphi version 3.
3.4.4 Excel
1. Load the spreadsheet ps2000.xls
2. Select Tools | Macro
3. Select GetData
4. Select Run
Note: the Excel Macro language is similar to Visual Basic. The functions which return
a TRUE/FALSE value, return 0 for FALSE and 1 for TRUE, whereas Visual Basic
expects 65 535 for TRUE. Check for > 0 rather than = TRUE.
3.4.5 Agilent VEE
The example function ps2000.vee is in the Examples subdirectory. It uses
procedures that are defined in ps2000.vh. It was tested using Agilent VEE version 5.
3.4.6 LabVIEW
The ps2000.vi example in the Examples subdirectory shows how to access the
driver functions using LabVIEW. It was tested using version 6.1 of LabVIEW for
Windows. To use the example, copy these files to your LabVIEW directory:
ps2000.vi
open_unit.vi
set_channel.vi
setup_data_collection.vi
You will also need
ps2000.dll
from the installation directory.

PicoScope 2000 Series Programmer's Guide 13
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3.5 Functions
3.5.1 Introduction
The PicoScope 2000 Series API exports the following functions for you to use in your
own applications:
ps2000_close_unit
ps2000_flash_led
ps2000_get_streaming_last_values
ps2000_get_streaming_values
ps2000_get_streaming_values_no_aggregation
ps2000_get_timebase
ps2000_get_times_and_values
ps2000_get_unit_info
ps2000_get_values
ps2000_last_button_press
ps2000_open_unit
ps2000_open_unit_async
ps2000_open_unit_progress
ps2000_overview_buffer_status
ps2000_ready
ps2000_run_block
ps2000_run_streaming
ps2000_run_streaming_ns
ps2000SetAdvTriggerChannelConditions
ps2000SetAdvTriggerChannelDirections
ps2000SetAdvTriggerChannelProperties
ps2000SetAdvTriggerDelay
ps2000_set_channel
ps2000_set_ets
ps2000_set_led
ps2000_set_light
ps2000SetPulseWidthQualifier
ps2000SetSigGenArbitrary
ps2000SetSigGenBuiltIn
ps2000_set_trigger
ps2000_set_trigger2
ps2000_stop
The following user-defined function is also described here:
my_get_overview_buffers

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3.5.2 ps2000_close_unit
short ps2000_close_unit (
short handle
)
Shuts down a PicoScope 2000 Series oscilloscope.
Applicability
All modes
Arguments
handle: the handle, returned by ps2000_open_unit(), of the
oscilloscope being closed.
Returns
non-zero: if a valid handle is passed.
0: if handle is not valid.

PicoScope 2000 Series Programmer's Guide 15
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3.5.3 ps2000_flash_led
short ps2000_flash_led (
short handle
)
Flashes the LED on the front of the oscilloscope (or in the pushbutton, for the
PicoScope 2104 and 2105 oscilloscopes) three times and returns within one second.
Applicability
All modes
Arguments
handle: the handle of the PicoScope 2000 Series oscilloscope.
Returns
non-zero: if a valid handle is passed.
0: if handle is invalid.

Technical information16
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3.5.4 ps2000_get_streaming_last_values
short ps2000_get_streaming_last_values (
short handle
GetOverviewBuffersMaxMin lpGetOverviewBuffersMaxMin
)
This function is used to collect the next block of values while fast streaming is
running. You must call ps2000_run_streaming_ns beforehand to set up fast
streaming.
Applicability
Fast streaming mode only.
PicoScope 2203, 2204 and 2205 only.
Not compatible with ETS triggering. Function has no effect in ETS
mode.
Arguments
handle: the handle of the required oscilloscope.
lpGetOverviewBuffersMaxMin: a pointer to the
my_get_overview_buffers() callback function in your application
that receives data from the streaming driver.
Returns
1: if the callback will be called.
0: if the callback will not be called, either because one of the inputs
is out of range or because there are no samples available.