limit on chip select pins for a microcontroller to be used in SPI communication?

[myatham]

Hi,
Is there any limit how many chip selects an SPI module in a microcontroller supports if i use GPIOs for chip select pins?

 

[Tahmid]

The limit is the number of GPIO pins you can use - that which you have available or by increasing count by using shift register, port expander, etc. Just don't place the devices too far away.

Hope this helps.
Tahmid.

 

[doraemon]

Hello!

Just don't place the devices too far away

Would be good to explain what you mean by too far away.
Is it 20 cm? 1m? 100 m? 1km?

Dora.

 

[Tahmid]

20cm would be ok. The longer you want, the slower you need to use it. Take a look here: https://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=60979