programing DMA I/O in C++ or C#

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hi I Need a Book or Sites or Texts for help programing ports i/o with DMA in visual or turbo C++ and C# languages

DMA: data memory access input/output

my email: [EMAIL REMOVED]

Posted 7-Nov-11 2:30am

ali.negahdari

Updated 7-Nov-11 10:13am

Sergey Alexandrovich Kryukov

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Andrew Brock 7-Nov-11 8:38am

Removed bold and email address.
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2 solutions

Solution 1

Did you try googling[^] it?

Posted 7-Nov-11 2:51am

Andrew Brock

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ali.negahdari 7-Nov-11 12:09pm

tanks
but i need realy code and advanced program

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JackDingler · Accepted Answer · 2011-11-07T06:36:00

I didn't have any trouble finding source code using google.

DMA is Direct Memory Access.

It's a technology for doing bulk memory transfers to and from hardware, across a memory bus. It allows the transfer to happen during the unused clock cycles of a CPU and/or in hardware designed to do the transfer without CPU interaction.

The specific ports and memory locations needed to perform this action is dependant on the hardware that you are moving the data to and from. You'll need tech data sheets for the hardware you're interfacing, or source code for a sample driver to determine what calls you need to make to set up the hardware. you're referring to Turbo C++, so I think it's safe to assume your interested in interfacing in a PC bus. For that you'll also need to know if you're interfacing to an 8 bit card or a 16 bit card.

Once again, referring to the manufacturer's specifications and sample code is the best place to start.

Now If I misunderstand what you're asking, and you just want to read and write to ports... then use the functions inportb() and outportb().

I don't think you can do this with C#. This level of coding is usually done in assembly or C/C++.