GPIO as CS for SPI

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danielm
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Joined: Mon Oct 05, 2015 12:24 pm

GPIO as CS for SPI

Post by danielm » Thu Nov 12, 2015 6:12 pm

Do you see any issue with using GPIOs as chip-selects for SPI devices if number of regular CS pins is not enough for my application?

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dhylands
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Re: GPIO as CS for SPI

Post by dhylands » Thu Nov 12, 2015 6:47 pm

I think it should be fine. I also think that would be a useful feature to add to the SPI driver (ability to specify a GPIO pin as a CS).

You may need to not use the builtin CS at all (or configure it as a GPIO) since the current SPI driver probably asserts it all the time.

In the meantime, you could just do it manually.

nsoatw
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Joined: Mon May 12, 2014 6:13 pm

Re: GPIO as CS for SPI

Post by nsoatw » Fri Nov 13, 2015 2:20 pm

I've used GPIO for SPI-CS with good results, nothing unforseen happened.

danielm
Posts: 158
Joined: Mon Oct 05, 2015 12:24 pm

Re: GPIO as CS for SPI

Post by danielm » Fri Nov 13, 2015 8:59 pm

Thank you gentlemen, that's what I was hoping for :)

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