The Flutter code appears to use an SPI interface internally for the radio. Is it possible to use the same interface with other devices and not conflict with Flutter's use? The Atmel chip supports multiple instances of SPI with different CS pins, but they appear to be in use for other purposes.
Finally, there is SPI code in the Flutter library. Is it modified from the SPI code that is normal with Arduino?
I would like to hook up both an SDHC card and a network connection, both of which are frequently interfaced via SPI.