0bit

[Robert]

Iwant to receive an existing rf protocol. After analyzing it, it is simple OOK, NRZ encoded. What i wonder is that every word (8bit) starts with a "0"bit, followed by the 8 actual data bits and closed by a "1" bit. So, each 8bit word of payload is "framed" by a start and stop bit.

I know that I can use the asynchronous serial mode but I wonder if there is a way of using the cc1101 build in packet handling logic. Each packet is preceded by a 5ms carrier, followed by two sync bytes (AA). Each of them are actually a 10bit sequence: (0)10101010(1). That pattern is consistent for the rest of the packet. It ends with a checksum byte (unknown type for now) and the frame is closed after the trailing (last) 1bit by a 2.35ms carrier.

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