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Connecting C6748 SPI0 to multiple DACs using multiple Chip Selects

Alex Shpilsky
Intellectual 1000 points

Hello,

I would like to use a single SPI port on C6748 to connect to multiple DACs using SPI0 multiple Chip Selects. I would also like to use EDMA channels to transfer the data from memory buffer to a specific SPI connected DAC, then move to the next DAC, and the next. Is this possible? Can EDMA channel be tied to a specific SPI Chip Select?

Thank you,

Alex

  • 0
    TI__Genius 9490 points

    Alex,

    EDMA channels can not be tied to a specific SPI CS, however a EDMA channel(or the CPU) has the ability to write the upper 16bits of the SPIDAT1 register and change the Chip select (using the CSNR[n] bits).  Not fully sure how do implement that but its just an idea that might help you implement a solution to what you are trying to accomplish..

    regards,

    miguel

     

  • 0 in reply to Miguel A. Alanis
    Intellectual 1000 points

    Miguel,

    1) How do we interface 18-24 bit ADC to a SPI bus on the C6748.  Is there a way to set up the SPI interface to be able to read 18-24 bits of data from an ADC

    2) How do we interface an 18-24 bit Parallel ADC to a C6748.  I only has a 16 bit external parallel interface.

    3) We would like to inteface C6748 to a host processor using eHPI interface, but our host processor only supports the following interface modes:

          Multiplexed 32-bit address and 32-bit data OR

          Multiplexed 32-bit address and 16-bit data or

          (non-multiplexed 16-bit address and 16-bit data)

          Non-multiplexed 32-bit address and 32-bit data busses

    Thanks,

    Alex