How to connect two MCU using SPI? What are the requirement and how I should processed?


Joined Feb 24, 2006
You connect the devices in such a way that one device generates a signal, and the other device receives the signal. There is only one way to do this.


Joined Aug 27, 2009
My slave MCU is STM32G0B1 and for master Im going to use SOM which has 3 SPI interface.
By 3 do you mean 3 wire (one wire bi-directional) interface vs 4 wire SPI interface?

One master to the slave in the standard SPI connection scheme for 4 or 3 wire connections. For slave initiated communication/transactions, I use a interrupt line on the master that the slave can trigger by a slave gpio pin toggle to start a SPI exchange from master to slave to receive the slave datastream.