SPI interface with SD card

[CHEVYAN]

Hello all,

Do you advise to have 2 SPI interfaces - one for the sensors we're using (accelero/ gyro) and another one for the SD card? if so, when adding an SD card to our board we have to change pins, is that correct? thanks for your quck answers

[Jakub Rzeszutko]

It depends. If you do not need to have transfers at the same time you can use only one SPI instance.

When using one instance you also have a choice. If you wish to save some GPIOs both slaves can share MOSI, MISO and CLK lines and only have sparate PINs for SS.

You can take a closer look to nrf_spi_mngr (http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.2.0/lib_nrf_spi_mngr.html?cp=4_0_0_3_44) functionality, it allows to schedule transfers with different PIN configuration.