Does stm32f730i8 support 3 wire SPI (CS, SCLK, and a bidirectional Data line?)

[ChahinezC]

Hello @KGerb.1​,

STM32F73xx devices have four I/O pins that are dedicated to SPI communication with external devices:

• MISO
• MOSI
• SCK
• NSS

You can check the 28 section of the RM0431: STM32F72xxx and STM32F73xxx reference manual for further details.

Chahinez.

[KGerb.1]

Thanks Chahinez. It looks like your Half-duplex single master/ single slave application mode behaves as a 3 wire SPI.

[waclawek.jan]

Yes it does, but beware, the read direction of master may be tricky, as it runs clocks automatically when enabled and turned to Rx.

JW