Logic Level shifter - Arduino UNO with RA-02 module

Using Arduino Networking, Protocols, and Devices
#1

I have an Arduino UNO which currently works fine with the RA-02 LoRa module. However, as the UNO is 5v and the RA-02 a 3.3v unit, I need to use a level shifter for the long term.

Do all connections (besides ground and power) need to be connected to a level shifter or only certain ones?

I have MISO, SCK, MOSI, NSS, DI00 and RST connected to the LoRa module from the Arduino.

#2

Paulvr:
Do all connections (besides ground and power) need to be connected to a level shifter or only certain ones?

What does the datasheet for the RA-02 say, does it quote different voltage level maximums for different pins ?

I dont think it does ............................

#3