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rfm12trx - A simple RFM12 433Mhz transceiver
http://schoar.de/tinkering/rfm12trx
1. Flash the RT232RL through USB
http://www.ftdichip.com/Support/Utilities.htm#FT_Prog
See firmware/rfm12trx_ftprog.xml (12Mhz on CBUS0)
2. Flash the ATMega8 through ISP
make fuse
make program
3. Send/Receive hex strings via ttyUSBx, e.g. screen /dev/ttyUSB0 115200