Sensoray 421 Manual de usuario descargar pdf (Pagina 22)

Page 20 Sensoray Model 421 Instruction Manual

Appendix D: Programming

Sample QuickBasic code segments are listed below to illustrate programming interface techniques for the 421

board. If you are coding your application in a language other than QuickBasic, you may find these listings

useful as a framework for writing your own drivers.

Although these listings are intended principally as programming examples, they may be used as is (or with

minor modification) as a basic set of interface drivers for the 421.

Feel free to modify, plagiarize and adapt these listings to suit your application requirements.

‘****************************************************************************

‘ SAMPLE QUICKBASIC INTERFACE CODE FOR THE 421

‘****************************************************************************

CONST BASEPORT = &H3A0 ‘421 I/O base address

‘ Write-only I/O ports:

CONST DAC0LSB = BASEPORT + 0 ‘DAC data registers

CONST RESETPORT = BASEPORT + 11 ‘board reset

CONST CHCTRL = BASEPORT + 12 ‘ADC channel reg / watchdog, DAC enables

CONST ADSTART = BASEPORT + 13 ‘start A/D

CONST CNTCTL = BASEPORT + 14 ‘encoder control port

CONST HITDOG = BASEPORT + 15 ‘watchdog refresh

‘ Read-only I/O ports:

CONST LDAC = BASEPORT + 0 ‘DAC update port

CONST STATUSPORT = BASEPORT + 11 ‘board status

CONST ADLSB = BASEPORT + 12 ‘A/D least-significant byte

CONST ADMSB = BASEPORT + 13 ‘A/D most-significant nibble

CONST CNTLSB = BASEPORT + 14 ‘encoder least-significant byte

CONST CNTMSB = BASEPORT + 15 ‘encoder most-significant byte

‘ Read/Write I/O ports:

CONST RELAY0 = BASEPORT + 8 ‘relay channel low bank access ports

CONST RELAY2 = BASEPORT + 16 ‘relay channel high bank access ports

‘ CHCTRL port bit constants:

CONST DOGBIT = 1 ‘watchdog enable/disable control bit

CONST DACBIT = 2 ‘DAC output enable/disable control bit

‘ Boolean constants:

CONST FALSE = 0

CONST TRUE = NOT FALSE

‘ Variables that are visible throughout this module:

DIM SHARED relay%(0 To 5) ‘image of relay channel output registers

DIM SHARED chctrlImage% ‘image of CHCTRL output port

Module Level Code

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Sensoray 421 Manual de usuario Pagina 22