Agilent Technologies FS2010 Guide de l'utilisateur Page 102
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102 Agilent VISA User’s Guide
4 Programming via GPIB and VXI
Using High-Level Memory Functions
High- level memory functions allow you to access memory on
the interface through simple function calls. There is no need
to map memory to a window. Instead, when high- level
memory functions are used, memory mapping and direct
register access are automatically done.
The trade- off, however, is speed. High- level memory
functions are easier to use. However, since these functions
encompass mapping of memory space and direct register
access, the associated overhead slows program execution
time. If speed is required, use the low- level memory
functions discussed in “Using Low- Level Memory Functions”
on page 108.
Programming the Registers
High- level memory functions include the viIn and viOut
functions for transferring 8- , 16- , or 32- bit values, as well as
the viMoveIn and viMoveOut functions for transferring 8- ,
16- , or 32- bit blocks of data into or out of local memory.
You can therefore program using 8- , 16- , or 32- bit transfers.
High-Level Memory Functions
This table summarizes the high- level memory functions.
Table 25 Summary of High-Level Memory Functions
Function Description
viIn8(vi, space, offset, val8); Reads 8 bits of data from the specified
offset.
viIn16
(vi, space, offset, val16); Reads 16 bits of data from the specified
offset.
viIn32(vi, space, offset, val32); Reads 32 bits of data from the specified
offset.
viOut8(vi, space, offset, val8); Writes 8 bits of data to the specified offset.
- Agilent VISA User’s Guide 1
- 4 Agilent VISA User’s Guide 4
- Agilent VISA User’s Guide 5 5
- 6 Agilent VISA User’s Guide 6
- Introduction 7
- What’s in This Guide? 8
- VISA Overview 9
- VISA Support 10
- VISA Documentation 10
- Introduction 1 11
- Agilent VISA User’s Guide 11 11
- Contacting Agilent 12
- Agilent Technologies 13
- Linking to VISA Libraries 14
- Sample VISA Program (C/C++) 15
- C/C++ Sample Program Contents 17
- Format Conversion Commands 20
- Numeric Arrays 20
- Steps to Running the Program 21
- Sample Program Source Code 22
- Sample Program Contents 24
- Agilent VISA User’s Guide 25 25
- Logging Error Messages 26
- 28 Agilent VISA User’s Guide 28
- Programming with VISA 29
- VISA Resources and Attributes 30
- VISA Attributes 31
- 3 Programming with VISA 32
- Using Sessions 33
- Opening a Session 34
- Addressing a Session 36
- Sample: Opening a Session 39
- Closing a Session 40
- Searching for Resources 40
- Sending I/O Commands 43
- Formatted I/O Conversion 45
- Using Non-Formatted I/O 54
- Using Events and Handlers 57
- Programming with VISA 3 59
- Agilent VISA User’s Guide 59 59
- Agilent VISA User’s Guide 61 61
- Agilent VISA User’s Guide 63 63
- Using the Callback Method 65
- Sample: Trigger Callback 69
- Sample: SRQ Callback 71
- Using the Queuing Method 74
- Enabling Events 75
- Sample: Wait on Event for SRQ 77
- Sample: Trigger Event Queuing 77
- Trapping Errors 80
- Sample: Printing Error Code 81
- Exception Events 82
- Using Locks 87
- VISA Lock Types 88
- Sample: Exclusive Lock 89
- Programming via GPIB and VXI 93
- General Interface Information 94
- GPIB Interfaces Overview 95
- 82350 GPIB Card #1 96
- Windows PC 96
- GPIB InstrumentsGPIB Cable 96
- 82350 GPIB Card #2 96
- VXI Interfaces Overview 98
- GPIB-VXI Interfaces Overview 99
- GPIB-VXI (E1406A) Interfaces 100
- Programming the Registers 102
- Using viIn and viOut 103
- Using viMoveIn and viMoveOut 104
- Functions 106
- Mapping Memory Space 109
- Sample: Using viPeek16 110
- Unmapping Memory Space 111
- Using Low-Level viPeek/viPoke 115
- Using High-Level viIn/viOut 116
- Sample: Using VXI Memory I/O 117
- Memory I/O Services 121
- MEMACC Attribute Descriptions 124
- Agilent VISA User’s Guide 125 125
- VI_ATTR_WIN_ACCESS Settings 128
- Setting the VXI Trigger Line 129
- Programming via LAN 131
- 5 Programming via LAN 132
- Client/Server Model 133
- Gateway Operation 133
- Programming via USB 141
- USB Interfaces Overview 142
- Value Description Data Type 143
- 6 Programming via USB 144
- ViFind32 156
- VISA address 156
- VISA alias 156
- 158 Agilent VISA User’s Guide 158
- Agilent VISA User’s Guide 159 159
- 160 Agilent VISA User’s Guide 160
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