How to Transfer Data use of simple GPIO pins micro Controller to micro Controller?

[Ss.61]

*How we can transfer (eg:2 bytes of ) data through simple GPIO pins without using any of the communication protocols (uart,spi,i2c,etc..)

[waclawek.jan]

By bit-banging the same communication protocol.

JW

[Javier1]

If you dont want to use any already available communication protocol you need to create your own! (FUN!)

In that case you would have to make a lot of choices, how many gpios can you spare? how fast you need the data transmision to be?, serie or pararell data, or both?, Error check?

[TDK]

The OneWire protocol exists for this (among others).

https://stm32f4-discovery.net/2015/07/hal-library-05-onewire-for-stm32fxxx/

[waclawek.jan]

This appears to be master only.

JW

[TDK]

I interpreted the question as a one way transfer. Could be wrong, it's ambiguous.

[Ss.61]

Thank you very much for your answer.