Disable standard adressing

RE: Disable standard adressing

cth — Wed, 20 May 2015 06:56:42 GMT

Thanks for your help, Hung Bui. Now I know how to continue.

RE: Disable standard adressing

Hung Bui — Tue, 19 May 2015 14:23:09 GMT

@cth: You are correct on how the frame sync works. No, it's not possible to have a packet received without knowing the address that the RX expecting. Usually we use an common access address for broadcasting.

For example, with Bluetooth Low Energy, the access address for BLE advertising (broadcast) is 0x8E89BED6

RE: Disable standard adressing

cth — Tue, 19 May 2015 13:33:34 GMT

Okay, I see so the transmitter uses one of 8 logical adresses when transmitting and the receiver has a correlator for each of these adresses that if active and matching triggers a frame sync. I wonder then how pairing/registration is done if I have a receiving unit that don't know the BASE and PREFIX configuration of the transmitter. I guess this is not possible and that these units should be matched from production or enter a pairing/registration mode with a fixed address.

RE: Disable standard adressing

Hung Bui — Tue, 19 May 2015 11:23:06 GMT

Hi Cth,

You can reduce the size of the BASE to 2 bytes to have 3 bytes address (BASE+PREFIX). But you can't remove the field completely.

The access address together with the preamble act as the sync words or START signal to tell the receive there's a packet coming. Without the address you only have one byte preamble, it's very easy to miscapture a false packet because of noise.