I've had a few of the popular RFM12 ISM Transceivers lying around for quite some time, and am finally using them for a project now.The bad thing about them is their poor documentation, so I've been looking around for a finished & working library to use with them.
I've bought modules from
www.neuhold-elektronik.at and
www.pollin.de
Libraries:
Lib by Benedikt K. simple, low level, works well. Written for AVRs using avr-gcc; Bascom and PIC versions exist as well.
bla repository Sports CRC, high level API
Strobotics
Das Labor
Codevision C
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