Multimaster I2C communication

[carlf]

I'm working on a design featuring two different MCUs. I'm looking to use the nRF52840 as one of them. I need both processors to be able to send each other messages and ideally interrupt each other.

I was thinking of using Multimaster I2C. Is this supported on the nRF52840? Is there some other way to establish a bidirectional communication channel other than two separate I2C buses?

Thanks

[Nguyen Hoan Hoang]

I am not sure to fully understand what you want to do exactly.  If just to transfer data between 2 MCUs, there are many ways.  I2C (Master/Slave), SPI (Master/Slave) or UART.  Multimaster means 2 MCU in master mode trying to access the peripherals on the same bus not for talking to each other. 

[carlf]

I need either MCU to be able to initiate communication. The issue with a Master/Slave configuration is that the Slave needs to wait for the Master to initiate the communication.

[Nguyen Hoan Hoang]

The best solution for that is to use UART.  It is bi-directional.  It will interrupt on receive and send is independent sot both can send and listen at the same time.  The nRF can handle 1 MBaud.