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CC1352P: SPI slave max bitrate fails

Michael Brutman
Intellectual 321 points
Part Number: CC1352P


I'm  using the latest sdk example of spislave code, and conected the cc board to a rasberi pi via SPI.

i'm using python spidev lib, and when setting to 4MHZ bit rate the CC reports of a spi transaction failure , only around 2MHZ the bitrate is fine but even still the rate seems around 140kbps which seems pretty low for SPI protocol.

 any ideas on how to improve the bitrate?

is the SLAVE_READY gpio overhead is slowing down the kbps rate?

  • 0
    TI__Mastermind 20412 points

    Hi Michael, 

    The default SPI examples we ship works at the 4MHz.  I just tested them. So the hardware and the driver seem to be capable of functioning at this bitrate.

    But it seems that in the slave mode, 4MHz is the max supported bit rate, so the connection issues may be exaggerated in this mode. Please can you check the physical connections and shorten the wires.

    Regards,

    Sid