InnoTek FieldPro protocol and example code

[snout]

The InnoTek FieldPro uses 27,145MHz FM FSK and forward error correction, and is very picky about there being no jitter in the pulses. Hence the code uses a Si5351 clock chip with two PLLs, each set for '0' or '1' bits, and toggles between them when transmitting.

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// contains a whole constructed packet to be sent // preamble //14ms 21 40 59 spacer byte packet[] = { 0,1,0,1,0,1,0,1,0,1,0,1,0,1,1,0,0,0,1,1,1, 1,1,0,1,0,1,0,1,1,1,1,0,0,1,0,0,0,0,0, 0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,1,1,1, 0,1,0,0,1,1,1,0,0,1,1,0,0,0,0, 0,0,0,0,0,0,0,0,1, // 83 (packet 2, same as packet 1) preamble 1 ID error correction balancing 01 ID COMMAND e/c bal 01 COMMAND e/c trailer 0,1,0,1,0,1,0,1,0,1,0,1,0,1,1,0,0,0,1,1,1, 1,1,0,1,0,1,0,1,1,1,1,0,0,1,0,0,0,0,0, 0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,1,1,1, 0,1,0,0,1,1,1,0,0,1,1,0,0,0,0, 0,0,0,0,0,0,0,0 };