spi multiple devices with bcm2835 library

[Javier Terres]

Hi, I'm using a Raspberry Pi ZeroW in muy final proyect at university, and I am having problems with spi protocole. 

I have to use three spi devices, one digital to analog converter with two outputs,  and two analog to digital converters , all together. The problem is that the RaspberryPi only has two chip select pins, and I need three. Is it possible to use a gpio pin instead of a chip select pin? (like a conversion or similar).

It would be fantastic if someone could hel me, I have wasted a lot of time looking for information about this problem on the internet. Thank you very much ¡¡¡¡

[Sam James]

Hi Javier

I believe it is possible to use a standard GPIO line as a chip select. Although if your running two A to D converters could you daisy chain them? So you have one chip select for the D to A and one for both the A to D's.

here's some info on daisy chaining SPI chips:

https://www.best-microcontroller-projects.com/spi-interface.html

S

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[Javier Terres]

Trank you for the information, I'm going to ask my teacher if this methode is correct. But, if this IS wrong, how could I convert a gpio pin to a chip select pin? Is there any tool in the library to do that? 

Thanks 

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