Best alternative to integrating to another feather MCU

SteveD0

I’m thinking there will are two primary ways to integrate the nRF9160 to another feather MCU like the Adafruit Adalogger (M0 MCU): 1) I could stack one on top of the other, or 2) I could set them up separately and have them communicate to each other via I2C with just SDA. SCL and GND connections.
I’m presuming that in both alternatives I’ll have to set the Master-Slave I2C relationship. I’m thinking at this point the nRF9160 is the slave.

Is there a voltage issue with alternative 1? Which alternative do you think is a better approach? Any other general thoughts?

SteveD0

With alternative 1 wouldn’t there be issues with Rx and Tx being reversed as well as with SPI having a couple pins reversed?

jaredwolff

I’m currently doing it with UART but you can just as well do it with I2C. UART is slightly easier in my experience thus far. I’m still working on getting some code released on this but you can see how I implemented working code here:

https://github.com/pyrinas-iot/pyrinas-zephyr/blob/main/subsys/comms/comms.c