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TMS320F28377D: McBSP in slave mode with permanent activation of chip select signal

Clément Letonnelier
Expert 2686 points
Part Number: TMS320F28377D

Hi,

We are using one of the McBSP peripheral in SPI slave mode.

Can you confirm me that it would be working if the chip select is permanently active ?

As the access are based on the provided clock I am most certainly sure that it is not issue but I would prefer to get your confirmation.

Best Regards,
Clément

  • 0
    Guru 30330 points
    Clement,
    No, it will not work. The FSX must be toggled in between each transaction.

    From the F2837xD TRM in the" McBSP as an SPI Slave" section: "The McBSP requires an active edge of the slave-enable signal on the FSX input for each transfer. This means that the master device must assert the slave-enable signal at the beginning of each transfer, and deassert the signal after the completion of each packet transfer; the slave-enable signal cannot remain active between transfers. Unlike the standard SPI, this pin cannot be tied low all the time."

    Regards,
    Mark