SPI as 3 wire and gpio pin for cs

vijith_g1 — Sat, 04 Jul 2020 15:19:45 GMT

Hi,

I am working on sensor interface which have two SPI interfaces. For accessing data, I have to use different cs pin. So please let me know how will i configure spi as 3 wire interface and gpio for cs, as I don’t have proper details about registers both spi and gpio. I am using K60P144M150SF3 microcontroller. I am using spi 0 for spi interface.

Please let me know anybody having any details about it.

Please share the application or user guide of this K60P144M150SF3 microcontroller.

Thanks & Regards

Vijith G

Re: SPI as 3 wire and gpio pin for cs

kerryzhou — Mon, 06 Jul 2020 06:35:44 GMT

Hi vijith G ,

Do you want to use just one SPI module, and use two CS pin as the different sensor SPI select pin?

If yes, I suggest you define two GPIO directly.

Then the SPI interface just configure 3 pins: SPI_CLK, SPI_MOSI, SPI_MISO

Then two GPIO as the different SPI_CS, before you send the data, set the CS pin as high.

When you want to send the SPI data to the sensor, then set the CS GPIO pin as low.

You even don't need to configure the SPI related CS register, just control the GPIO register, and the SPI send receive and control register.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Best Regards,

Kerry

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SPI as 3 wire and gpio pin for cs

Re: SPI as 3 wire and gpio pin for cs