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TMS320F28335 DMA Bus Question

Marco_Andarcia
Intellectual 370 points
Other Parts Discussed in Thread: TMS320F28335

Hi 

I am going through the datasheet of  TMS320F28335 specifically looking for the drawing of the DMA BUS. I found the DMA bus description, and I am trying to determine if I can use the DMA Bus to read data from the GPIOs. I am trying to connect an External ADC that has Parallel Output. If its not possible, does anyone know of a microcontroller with complex math unit that can read GPIOs using the DMA bus? 

thanks. 

  • 0
    TI__Guru 61235 points

    Marco,

    See page 64 of the datasheet SPRS439m.  It says for the DMA:

    Data Sources/Destinations:
    – L4–L7 16K × 16 SARAM
    – All XINTF zones
    – ADC Memory Bus mapped RESULT registers
    – McBSP-A and McBSP-B transmit and receive buffers
    – ePWM registers

    So the DMA does not have access to the GPIO data registers.  Why not interface your ADC on the XINTF?

    Also, not sure what you mean by complex math unit.  The F28335 has a floating point unit.  There is no complex math accelerator in it.

    Regards,

    David

  • 0 in reply to David M. Alter
    Intellectual 370 points

    You are absolutely right, I could use the External Interface pins. 

    Thanks!