CC1310: Preamble Detection configuration for CMD_PROP_RX_SNIFF

Velay Patrick

Prodigy 120 points

Part Number: CC1310
Other Parts Discussed in Thread: CC1200

Hello

In the CC1310 SDK I used the exemple: rfWakeOnRadioRx

If I used just the Preamble detection, no RSSI detection (CarrierSenseMode_PQT).

The duration of Rx windows is 24 bits.

I am trying to set the CC1310 as on the CC1200 on 11 symbols.

See User's Guide of CC1200 §6.8, or SmartRF CC1200 PREAMBLE_CFG0.

PREAMBLE_CFG0 (0x000E)

0xDA

Preamble Detection Configuration Reg. 0

Bit No.	Name	Reset	R/W	Description
7	PQT_EN	0x01	R/W	Preamble detection enable Values: 0 : Preamble detection disabled 1 : Preamble detection enabled
6:4	PQT_VALID_TIMEOUT	0x05	R/W	PQT start-up timer. PQT_VALID_TIMEOUT sets the number of symbols that must be received before PQT_VALID is asserted Values: 000 : 11 symbols 001 : 12 symbols 010 : 13 symbols 011 : 14 symbols 100 : 15 symbols 101 : 17 symbols 110 : 24 symbols 111 : 32 symbols
3:0	PQT	0x0a	R/W	Soft Decision PQT. A preamble is detected when the calculated preamble qualifier value (PQT_SYNC_ERR.PQT_ERROR) is less than PQT. A low threshold value means a strict preamble qualifier (preamble must be of high quality to be accepted) while a high threshold value will accept preamble of a poorer quality (increased probability of detecting false preamble)

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over 6 years ago

0 Velay Patrick over 6 years ago

Prodigy 120 points

I read the chap. Correlation period in the exemple rfWakeOnRadioRx

http://dev.ti.com/tirex/content/simplelink_cc13x0_sdk_1_30_00_06/docs/proprietary-rf/html/cc13x0/examplesusersguide/rfWakeOnRadioRx/README.html#correlation-period

But I find it strange that we cannot adjust the CC1310 like the CC1200.

There must be a solution.

0 Siri over 6 years ago in reply to Velay Patrick

TI__Guru* 87001 points

On the CC1310, the correlator is 8 bits wide. The 24 bits the documentation refers to is the the total time it takes before the you can get the first correlation hit (the radio needs some time in RX to be able to detect the preamble:

Siri

0 Velay Patrick over 6 years ago in reply to Siri

Prodigy 120 points

Thank you for the answer.

I have already used on the CC1200, 11-bits to detect the PQT_VALID, and the length of the Rx window is indeed of a duration of 11 bits (no need for time in RX to be able to detect the preamble).
It is not possible to decrease the 24 bits on the CC1310?

Patrick

0 Siri over 6 years ago in reply to Velay Patrick

TI__Guru* 87001 points

No. However, as I tried to explain, the 24 bits does not mean that you need 24 bits preamble to get a correlation hit. You only need 8. 24 bits just refer to how long time the radio need in RX to be able to detect these 8 bits.

Siri

Sub-1 GHz

Sub-1 GHz forum

CC1310: Preamble Detection configuration for CMD_PROP_RX_SNIFF