Using Dma Transfer With Pcm-3718 Cards - Advantech PCM-3718 Series User Manual

8.2 Using DMA Transfer with PCM-3718 Cards

A DMA transfer is a powerful but complicated operation. Related
descriptions of the DMA transfer have been covered in other paragraphs
of this manual (for details please see pages 38~40). The following steps
summarize how to use DMA transfer with PCM-3718 cards:
1. When you configure your hardware, check if any PC DMA channel
is available (level 1 or level 3) and set the PCM-3718 card's jumper
JP1 accordingly.
2. If you will be using the PCM-3718 driver for your DMA transfer
programming, see the Software Drivers User Manual for more infor-
mation.
3. If you choose to conduct your own DMA operation, you will need to
have a solid understanding of the PC, 8237 DMA controller and the
chosen PCM-3718 card. Make sure you perform the following steps
in your DMA transfer:
a. Initialize the 8237 DMA controller register and page register.
b. Send DMA enable and trigger source data to the PCM-3718
c. Set an external trigger pulse or pacer trigger rate.
d. Enable the trigger source to start the A/D conversion.
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card's control register (located at address BASE+9).
63 Chapter 8