Omega-engineering OME-A826PG Bedienungsanleitung PDF herunterladen (Seite 52)

OME-A-826PG Software Manual [Win 95/98/NT]

3.6.3 A826_AD_DMA_Start

z Description:

This subroutine will allocate a DMA buffer in the system area, and

programming the gain code and sampling rate. then starting the DMA transfer for

a specific A/D channel.

z Syntax:

WORD A826_AD_DMA_Start(WORD Ch, WORD Gain, WORD c1, Word c2,

int Count, WORD wPassOut[ ] )

z Parameter:

Ch : [Input] the A/D channel.

Gain : [Input] the Gain code

c1,c2 : [Input] the DMA sampling rate is 2M/(c1*c2)

Count : [Input] the desired A/D entries count for DMA transfer.

wPassOut[] : [Output] the debug information.

wPassOut[0] : [Output] 0: successful in starting DMA transfer.

others: fail in starting DMA transfer.

wPassOut[1] : [Output] system DMA buffer ID.

wPassOut[2] : [Output] the I/O port base address.

wPassOut[3] : [Output] the IRQ level for DMA.

wPassOut[4] : [Output] the DMA channel no.

wPassOut[5] : [Output] reserved.

wPassOut[6] : [Output] reserved.

wPassOut[7] : [Output] reserved.

wPassOut[8] : [Output] the last 16 bits of physical address

for DMA buffer in system area.

wPassOut[9] : [Output] the first 16 bits of physical address

for DMA buffer in system area.

z Return Value:

NoError : successful

DmaStartError : failure

Date: Aug-15-2000 Ver: 2.2 Page 50

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Omega-engineering OME-A826PG Bedienungsanleitung Seite 52