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Original question:

LAUNCHXL-F28379D: Consultation on ADC Sampling Error

F28377D-SEP: SPI SPISTE pin

wu qiansen
Prodigy 20 points

Part Number: F28377D-SEP

In SPI controller mode, can I manually control the high and low output of the SPISTE pin? Which library function should I use, or how can I control it through registers? Or, during transmission, can this pin only be automatically pulled high or low depending on whether the SPI module is working or not?

  • +1
    TI__Mastermind 25410 points

    Hi Wu,

    The SPISTE pin cannot be controlled via registers in the SPI module. If you want to control the chip select manually, the best way would be to use a GPIO configured as an output and set it high or low in your code. 

    The normal operation of the SPI module (SPISTE used) will toggle the GPIO low or high according to the SPI protocol. Usually, the only reason to do a manual toggle would be if there is more than one slave device on the line. If you are only using one slave device, I would suggest using the built in SPISTE pin. 

    Best Regards,

    Delaney