Question on adafruit feather M0 LoRa SPI and LoRa radio
Only one device can be addressed at one time. You need to provide separate SS(slave select) pins for each device. It is then up to your code to manage who is being talked to at one time. Alternately, provide another SPI interface = this can be bit-bashed (code to toggle the required gpio pins) vs the SERCOM/SPI peripheral. As for 'simultaneously', I dare say reading the CS5463 only takes a short amount of time vs the LoRa stack actually transmitting the data, so as long as the system can send your data at the required update rate, this is a close to 'simultaneous' as you'll get. Remember, you only have one processor that can run only one bit of code at a given time.