nRF52833-QDAA + nRF21540 + SPI Flash

[andrea@al2tech]

Hello,

we are developing a new product based on the nRF52833 QFN40 IC.

We would like to add the nRF21540 range extender to the product and also a SPI Flash to store firmware images that will be used for firmware updates.

Is it possible to share the SPI bus (SCLK, MOSI, MISO) between the nRF2150 and the Flash? Is there any incompatibility both from HW and FW point of view?

Thanks for your help!

Andrea

[Kazi Afroza Sultana]

Hello Andrea,

''Is it possible to share the SPI bus (SCLK, MOSI, MISO) between the nRF2150 and the Flash? Is there any incompatibility both from HW and FW point of view?''

It is possible to share the SPI bus between nRF2150 and the Flash. You need to select different Chip select line (CS) under SPI master. SCK, MOSI, MISO are common. One CS pin for each SPI slave device to select which one are active during the transfer.