CCA on CC1101

Roger Wilson

Prodigy 80 points

Other Parts Discussed in Thread: CC1101

I've set GDO2 to mode 0x09 (Clear Channel Assessment, high if RSSI is below a threshold), CCA_MODE[1:0] = 01.

Is it OK to have a Tx flow from the RX state something like:

volatile bool CCA_state;

[Load the TxFIFO]

CCA_state = Board_GD02_Radio_input();

while (!CCA_state) // Wait until Channel Clear Assessment shows clear

CCA_state = Board_GD02_Radio_input();

CC1101_Status_byte = CC1101_cmd_strobe (CC1101_Cmd_Strobe_STX, Write);

I'm getting some erratic behaviour with this so I guess I'm not understanding what's going on. Does the GDO pin give a constant reading of the radio environment when in RX state?

over 9 years ago

0 PM over 9 years ago

TI__Mastermind 27145 points

Hi,

Please see the following link for guidance on CCA.

Thanks,

0 Roger Wilson over 9 years ago in reply to PM

Prodigy 80 points

Hello,

Thanks, but this doesn't deal specifically with the use of a GDO pin as the CCA indicator. Does it give a continuous indication of the CCA status whilst in RX and can therefore be continuously sampled until set and then a TX state be entered please?

Thanks,

Rog.

0 PM over 9 years ago in reply to Roger Wilson

TI__Mastermind 27145 points

Hi,

Yes, GDO pin gives continuous indication based on a valid RSSI value present in the RSSI Register.

Please refer to RSSI section on the data sheet for further details.

Thanks,

0 Saurabh Kumar over 9 years ago in reply to PM

Prodigy 20 points

I am using MSP430F5338A in EXP user board provided by TI with CC1101 chip.

I need to check CCA enabled not not.

I am using register settings as specified 0x09 for CCA mode enable in GDo2 pin.

Can you tell which pin is GDo2 ?

Thanks

0 Sverre over 9 years ago in reply to Saurabh Kumar

TI__Mastermind 39860 points

CC1101 GDO2 is pin 3. PLease ref to page 20ff in the CC1101 data sheet;

0 Saurabh Kumar over 9 years ago in reply to Sverre

Prodigy 20 points

Thanks for reply,

I understand it is pin 3 in CC1101, but i want to know which pin in MCU board MSP430F548EXP board (GDo2)?

As GDo0 pin is P1.7 and CS is P3.0.

Thanks for helping.

Saurabh

Sub-1 GHz

Sub-1 GHz forum

CCA on CC1101