Omega Engineering OME-A826PG 사용자 설명서
OME-A-826PG Software Manual [Win 95/98/NT]
3.6
AD , DMA functions
The DMA mechanism supports the Windows 95/98 only.
3.6.1 A826_AD_DMA_InstallIrq
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Description:
This subroutine will install interrupt handler for a specific IRQ Level n and
programming a DMA controller (8237) to handle DMA transfer for DMA Channel
n. Usually, when a DMA transfer finished, a associated IRQ level n occur.
n. Usually, when a DMA transfer finished, a associated IRQ level n occur.
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Syntax:
WORD A826_AD_DMA_InstallIrq(WORD wBase, WORD wIrq, WORD
wDmaChannel );
wDmaChannel );
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Parameter:
wBase
:
[
Input
] the I/O port base address for A826 card.
wIrq :
[
Input
] the IRQ level n.
wDmaChannel : [
Input
] the DMA channel.
Usuallly, the wDmaChannel is 1 or 3.
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Return Value:
NoError
:
successful
in installing the handler
InstallDMAIrqError :
failure
3.6.2
A826_AD_DMA_RemoveIrq
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Description:
This subroutine will remove the interrupt handler installed by.
A826_AD_DMA_InstallIrq(…).
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Syntax:
WORD A826_AD_DMA_RemoveIrq(void )
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Parameter:
void
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Return Value:
NoError
:
successful
RemoveDmaIrqError :
failure
Date: Aug-15-2000 Ver: 2.2 Page 49