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How to perform Host PC's DMA to access C6670's BAR1 memory through PCIE?

Feng
Expert 2985 points

Hi all,

I had used the WinDriver to create one PCIE demo project on Windows Host PC.

And the DSP project is using  C:\ti\pdk_C6670_1_1_2_6\packages\ti\drv\exampleProjects\PCIE_exampleProject.

And now the Host PC PCIE demo project can read/write the DSP BAR1 memory space correctly.

Then I want to implement the Host PCIE DMA to access the DSP BAR1 memory space.

Do I need to modify something based on the project C:\ti\pdk_C6670_1_1_2_6\packages\ti\drv\exampleProjects\PCIE_exampleProject?

For simplicity, I do not use DSP's EDMA to access PC's memory through PCIE.

So I think I do not modify the C:\ti\pdk_C6670_1_1_2_6\packages\ti\drv\exampleProjects\PCIE_exampleProject to accommodate the Host PC. Am I right?

From the WinDriver view, its PCIE DMA demo codes need to write the device's registers like following picture.

Can anyone give some hints about this above?

Regards,

Feng

  • 0
    TI__Guru** 116100 points
    Dear Feng,

    So I think I do not modify the C:\ti\pdk_C6670_1_1_2_6\packages\ti\drv\exampleProjects\PCIE_exampleProject to accommodate the Host PC. Am I right?

    Yes, you don't want to change anything in our PCIe example for EDMA access in RC PCIe device (PC).

    We also have ready made DMA write/read support in PCIe example in latest processor SDK package. So you can also use EDMA at EP side (DSP) too.
    www.ti.com/.../PROCESSOR-SDK-C667x
  • 0 in reply to Titusrathinaraj Stalin
    Expert 2985 points

    Hi Titusrathinaraj,

    Thanks!

    I had a little confuse about the PCIE DMA. I think there are two kind of PCIE DMA, one is PC as the DMA master to read/write the DSP's BAR1 memory space and the other one is DSP as DMA master to read/write PC's memory space. Am I right?

    For simplicity, I do not change my current DSP project and just need to modify PC WinDriver codes to perform DMA.

    Could you give me some hints to use DMA under WinDriver which I mean is PC as DMA master? Maybe you have some experience about this.

    Regards,

    Feng