STM32 SPI usage question

[gogoman]

Hello, I'm not a embedded person nor an expert with STM. is it possible to use the SPI internal hardware, with a gpio which I toggle to clock out/in data.
If so in general how?  The micro is the master.


thanks gogo

[dietert1]

If you input your GPIO generated clock into the SPI peripheral unit pin SPI1_SCK, you can configure and use the SPI unit as SPI slave. Is that what you want to do?

[gogoman]

If you input your GPIO generated clock into the SPI peripheral unit pin SPI1_SCK, you can configure and use the SPI unit as SPI slave. Is that what you want to do?

yes: to replace the internal SPI clock with GPIO generated clock and no: the STM32 SPI is a master not a slave.


gogo

[dietert1]

That can't work. If you want to run the SPI interface from an external clock, its clock pin must be an input, so it will run in slave mode. That STM32 can still be the SPI master, but its SPI device can't.