SPI0 Chip Select Active High

[Tony]

Currently the default for the SPI0 chip select is active low. I would like to change it to active high. Can I do this?

If not can I just have the SPI chip select on a pin I am not using and manually control the CS for SPI0? For example I would just turn it on before any SPI writes and turn it off when done.

[James Yu]

That is currently not supported, you'll have to do it manually:

uint8_t ss_pin;       ///< Slave Select pin number (optional).
                      /**< Set to @ref NRF_DRV_SPI_PIN_NOT_USED
                       *   if this signal is not needed. The driver 
                       *   supports only active low for this signal. 
                       *   If the signal should be active high,
                       *   it must be controlled externally. */

To manually control the CS you can set the ss_pin to NRF_DRV_SPI_PIN_NOT_USED and configure that pin as a GPIO output.

[Tony]

Thank you for the answer.

It looks like the setting you mentioned for the mode is for the Clock. I would like the exact same setting for the Chip Select. Is that possible?

[James Yu]

Sorry I misunderstand, I've updated my answer. It's currently not supported and you'll have to do it manually.