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TMS320F28388D: CLB to SPI CLK Connection – GPIO Usage

Wilko Moritz
Intellectual 255 points
Part Number: TMS320F28388D


Tool/software:

Hello,

If I’m connecting a CLB output to the SPI CLK input, and this is routed internally within the processor,
do I still need to reserve the associated GPIOs (even if they remain unconnected), or can this be done entirely without using any GPIOs?

Kind regards,

Wilko

  • +1
    TI__Mastermind 28220 points

    Hi Wilko,

    GPIO configuration is only necessary if you are using an external signal from a pin. You can override the SPI clock without any interaction from the GPIOs.

    Thank you,

    Luke

  • 0 in reply to Luke Jones
    Intellectual 255 points

    Hi ,

    Thanks for the information.

    Just to make absolutely sure there’s no misunderstanding — since GPIOs are difficult to free up once used — could you please confirm:

    Are no GPIOs required or implicitly reserved when connecting the CLB output to the SPI CLK input internally? In other words, are all GPIOs  (and their respective pins) that could theoretically be involved in this connection still completely available for other purposes?

    Kind regards,

    Wilko

  • +1 in reply to Wilko Moritz
    TI__Mastermind 28220 points

    Hey Wilko,

    As long as your CLB configuration is capable of generating a SPI clock signal without the aid of an external signal that would use up a GPIO, yes the GPIO that would've been used for SPI CLK input can be used for other purposes.

    Thank you,

    Luke