When nRF24 interrupt is connected to Arduino, handling of reception
interrupts can be enabled. This will store all data received in a buffer
which will prevent messages from getting lost when the Arduino is too
busy to empty the FIFO.
Switched from printf_P to Serial.print to prevent all kinds of nasty
PROGMEM troubles.
Distinguish between 32- and 16-bit architectures when reading ptrs from
flash.
Ditched #defines MINIMAL & SERIAL_DEBUG.
Debugging code is now only included when DEBUG is defined.
If your target (e.g. ATTiny) cannot handle the extra code, then don't
enable DEBUG.
#defining DEBUG will now also output a register-dump on calling begin()
of NRF24 driver to aid in (connection) problems.