CC1200: CC1200 preamble setting

15 bytes of preamble is not supported so you can do one of the following:

1) Turn off preamble, sync and CRC  insertion and write the complete packet to the TX FIFO:

(15 x 0xAA) + sync + length + payload + CRC

In this case you need to use fixed packet length mode (length is the length of everything written to the FIFO), and the CRC must be calculated in SW.

2) Strobe STX with and empty FIFO, and then try to time when you start writing to the TX FIFO (the radio will transmit preamble as long as the FIFO is empty).

In the latter case it might be difficult to time exactly when to starts writing to the TX FIFO so option 1 would be the preferred way.

Siri

The RX will work as normal even if you transmit a longer preamble.

The only thing the receiver cares about is that there are some preamble before the sync word, so as long as write the correct data to the TXFIFO as described above, the receiver  will work in the exact same way as if you sent a packet "the normal way".

Siri