Omega-engineering OME-A826PG Manual de usuario descargar pdf (Pagina 56)

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

Next Loop

Using the A826_AD_DMA_RemoveIrq()

to remove IRQ handler.

8237

ADC

Sampling rate define by c1,c2

INT_Handler( )

BufferB

BufferA

system

area

Application

area

Using the A826_AD_DMA_Stop() to

release s

stem DMA buffer.

Using A826_AD_DMA_Start to allocate a

system DMA buffer and programming

sampling rate, desired transfer count then

starting the DMA.

Using A826_AD_DMA_InstallIrq(…) to

install a interrupt handler for IRQ level n and

programming the DMA controller.

To copy datas in bufferA to a user

defined buffer(ex. BufferB) by using

A826_AD_DMA_GetData(..) . Then the

user can analysis these data in BufferB

A buffer(ex. BufferA) in VxD will store

the DMA transferd data. The buffer is in

system area.

To test if DMA transfer is finish ?

(Using

A826_AD_DMA_IsNotFinished(..)

Function)

Yes

Date: Aug-15-2000 Ver: 2.2 Page 54

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Omega-engineering OME-A826PG Manual de usuario Pagina 56