Chapter 8: Direct Memory Access Operation - Advantech PCM-3718H User Manual

1. When you configure your hardware, check if any PC DMA channel
is available (level 1 or level 3) and set PCM-3718H/3718HG
jumper JP1 accordingly.
2. If you will be using the PCM-3718H/3718HG driver for your DMA
transfer programming, see the Software Drivers User's Manual for
more information.
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 PCM-3718H/3718HG. 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-3718H/
3718HG control register (located at address BASE+9).
c. Set an external trigger pulse or pacer trigger rate.
d. Enable the trigger source to start the A/D conversion.
Chapter 8 Direct Memory Access Operation 55