Thank you for the link. I looked at that. Anyone - should this work? (i.e.: otherwise, the chip is most likely not functioning?). I
think this should work. Advice appreciated
Here is what I have done:
on RFM69HW for SPI need pins CS(Chip Select),CLK,MOSI,MISO,IRQ,GND,3.3V
CS,CLK, MOSI will go from 5V Arduino GPIO to 3.3V RFM69HW. For each of these, I set up a voltage divider: R2 = 3.3K R1 = 2.2K. When I tested with a multimeter, the voltage at the 1/2 way point was 3 V. So this should work to convert a Arduino HIGH of 5V to an RFM69HW HIGH of 3.3V.
The MISO, IRQ I plugged directly into the pins on the Arduino (IRQ -> pin 2, MISO -> pin 11)
I use the Arduino's 3.3V and GND to power the RFM69HW.
I then load struct_send sketch. The sketch can't get through radio.initialize(). It hangs on
do writeReg(REG_SYNCVALUE1, 0xaa); while (readReg(REG_SYNCVALUE1) != 0xaa);