RE: Interfacing between nRF52840 and BME680: I2C or SPI

awneil — Wed, 08 Jul 2020 10:18:07 GMT

This really has nothing to do with the nRF chip: the BME680 and the SD-Card - like any other external devices - neither know nor care what microcontroller you use.

So it's really just a question of whether it's ever wise to share an SPI connection between an SD-Card and other devices.

I would suggest that it's best avoided - so go for a separate SPI connection, or use I2C.

EDIT

For some of the issues to consider, see:

http://elm-chan.org/docs/mmc/mmc_e.html#spibus

There may well be others

Debugging SD-Card issues can be hard enough just on its own - you don't want to be adding extra complications!

- hence my recommendation is, "just don't do it!"