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HP IBASIC Program Example (VXIDOWN)
123
HP E1340A High Speed Operation
This program is similar to the DACBLOK program on page 115, except on
how the data is transferred to the AFG. The program uses IBASIC to
download the data using the VXIbus.
1
!RE-SAVE"VXIDOWN"
2
!This program generates an arbitrary waveform comprised of two
3
!waveform segments. The segment data (DAC codes) are transferred
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!from IBASIC to the AFG's input data register over the VXI backplane.
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!This method of data transfer is recommended when amplitude data
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!computation (by IBASIC) is not intensive, but fast downloading is
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!required.
8
!
10
!Assign I/O path between IBASIC and the E1340A.
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ASSIGN @Afg TO 80910
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!
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!Compute the E1340 base address in A16 address space. The base
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!address is used with the AFG's input data register offset to form
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!the complete register address.
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Base_addr=DVAL("1FC000",16)+(80*64)
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!
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COM @Afg,Base_addr,INTEGER Wave1(1:4096),INTEGER
Wave2(1:4096)
100
!
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!Set up error checking
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ON INTR 8 CALL Errmsg
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ENABLE INTR 8;2
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OUTPUT @Afg;"*CLS"
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OUTPUT @Afg;"*SRE 32"
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OUTPUT @Afg;"*ESE 60"
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!
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!Call the subprogram which resets the AFG.
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CALL Rst
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!
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!Set AFG parameters
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OUTPUT @Afg;"SOUR:FREQ:FIX 10E3;";!frequency
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OUTPUT @Afg;":SOUR:FUNC:SHAP USER;";!function
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OUTPUT @Afg;":SOUR:VOLT:LEV:IMM:AMPL 5.1175V" !scale
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!
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!Call subprogram which defines waveform segments A and B.
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CALL Sine_tri_wave
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!
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!Select output sequence and initiate waveform
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OUTPUT @Afg;"SOUR:FUNC:USER AB"
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OUTPUT @Afg;"INIT:IMM"
Continued on next page
amplitude
!wait-for-arm state
Chapter 6
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