SPI three lines mode

[Zou]

I want to use the SPI in master mode, but the slave just have three lines,the miso and the mosi is the same line,but I don't know how to config the pins? Do the nRF52832 supports this mode? if YES,could you tell me how to use it or some examples to reference ?

[RK]

No the nRF52 (and the nRF51) don't support 3-wire SPI mode. Not that many chips do, it's not a very usual protocol. I did see a diagram somewhere (and it was Nordic-related) someone was using two resistors to join the MISO and MOSI of a standard SPI interface and hook it up to a 3-wire SPI slave. I wasn't entirely sure it would work.