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Setting nss_soft in Master (SPI)

Question asked by Muzahir Hussain on Feb 17, 2018
Latest reply on Feb 19, 2018 by Bogdan Golab

I want to set NSS pin to software mode in master using STM32F103RB. But I've few questions?

In reference manual, they say,

In NSS Software mode, set the SSM and SSI bits in the SPI_CR1 register. If the NSS pin is required in output mode, the SSOE bit only should be set.

 

Now,

Why do we need to set SSI bit with SSM?

What is the purpose of SSOE bit?

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