SPI two way ESP32

[awneil]

@caller890

When i use the word simultaneously i refer to when the the master board receives any data from each of the other board it can issue back any command i.e. X = 0 during the same loop to that particular board.

That's exactly what SPI does - data is transferred from master to slave on MOSI simultaneously with data from slave to master on MISO.
This is called "full-duplex".

@caller890

For example
If CS pin to board 1 is low then receive data and transmit back. Store all data into variables

Followed by

If CS pin to baord 2 is low then receive data and transmit back. Store all data into variables.

And so on for the remaining 2 boards.

Exactly.

@caller890

is this right or wrong i transmit all data as Arrays

As far as the SPI is concerned, it's all just data - the SPI neither knows nor cares how you structure that data within your code.

[caller890]

Thank you Awneil

Now i know im heading in the right direction, appreciate your input.

I have found an Full Duplex example., going to play around with some code.

Ill update you once i have run a test

[caller890]

Ok , I have managed to get full duplex operating between two Arduino Mega , however ESP32 is more complex because of the ESP32SPISlave library, I have spent hours today searching for any articles / examples where someone has used full duplex on a ESP32.

Maybe I need to try build custom Mega board and ditch the ESP32