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Is it possible to reset the SPIDAT register?

Pierre Bouchet1
Expert 2615 points

Hi everyone,

I have a program running on an F28035, acting as an SPI slave (the word length is 16 bits).

I would like to erase the SPIDAT register every time the chipselect signal goes high. I thought it could be done automatically but it doesn't seem to be the case.

I would like to manually "erase" the SPIDAT at some point, i.e to discard any incomplete word received. How should I proceed?

  • Could it work using the SPICCR[SPISWRESET] bit?
  • What about switching off the SPI clock by clearing the PCLKCR0[SPIAENCLX] bit?
  • What is the effect of writing a new value to SPIDAT when in slave mode?

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Best regards,

Pierre

  • 0
    Guru 192875 points

    Hi Pierre,

    I would like to manually "erase" the SPIDAT at some point, i.e to discard any incomplete word received. How should I proceed?

    I guess this can shed some light here:

    In short, what I mean to say is try fiddling with the SPIDAT register.

    Could it work using the SPICCR[SPISWRESET] bit?

    So, only the flags would be reset but the data would be unchanged as mentioned!

    What about switching off the SPI clock by clearing the PCLKCR0[SPIAENCLX] bit?

    Sorry, no idea! Do check and let me know.

    What is the effect of writing a new value to SPIDAT when in slave mode?

    The most important thing one should remember while editing the SPIDAT value is to set/clear the flags (whichever applicable) such that when a Tx/Rx interrupt occurs the SPIDAT is updatable.

    Regards,

    Gautam