LAUNCHXL-CC1310: Reading Raw RF Packets

Hi Ravi,

Double check if your preamble and sync word are correct, as well as any other radio parameter. Are you using any of the predefined settings in SmartRF studio? Does it match the settings in your sensor?

Best regards,

Daniel

Its is necessary to have preamble and sync word, cant i read data without it

Hi Ravit,

Yes! You need both of them, it is the only way the radio will synchronize with the packet and be able to decode it. You won't see it on the SmartRF output box, it is used by the radio to detect the beginning of the data.

How is you sensor packet structured?

Best regards,

Daniel

And what is the command you are using the send the data? Can you share a snippet of that code?

- " read my sensor data" : Is this a sensor you have developed or is it 3 party?  

- Do you know the modulation format for this sensor? Very few newly developed nodes uses a format you describe, it looks more like it uses OOK. If that is the case, you have selected the wrong chip to receive the data since CC1310 needs a few bit preamble to settle the AGC and then a sync word. I would select a different sensor if you have any choice. 

- Do you know the datarate? 

Yes, it is developed by a third party. I am only testing it.

This is the information available in the datasheet. What additional settings or tools should I use to read the RF packets from this sensor?

Hi Ravi,

Is it possible you share the entire datasheet of your sensor?

For the table you describe above, it is user configurable, what settings have you used? Or what settings has the third party used?

Best regards,

Daniel

https://share.google/jJeamDCazhWgvyHBY datasheet, will confirm settings from third party

Hi Ravit,

Thanks for the datasheet.

1. Please also confirm what modulation scheme is used:

3.11.2 RF Modulation schemes
The device allows the user to choose between one of the following modulation schemes:
• ASK
• OOK
• FSK
• GFSK

2. The datasheet specifies a TX frequency of 314/433 MHz. The CC1310 chip does support the 433 MHz band, but the Launchpad you are using (LAUNCHXL-CC1310) is not tuned for that band, so might get a terrible performance. You can use a LAUNCHXL-CC1352P-4  LAUNCHXL-CC1352P Evaluation board | TI.com

Best regards,

Daniel

please find the information below..

Hi Ravit,

You could try using the 4.8 kbps OOK settings from SmartRF Studio.

• Set CMD_PROP_RADIO_DIV_SETUP formatConf.fecMode to A to enable Manchester encoding.
• Since there is no preamble, let's use some of the bytes from the Fsync as preamble, set Preamble Count to 4 bytes
• Set Sync Word Length to 16 bits: 00 4d

Can you explain what is the  "Header" is this fixed to 4D or variable? On that depends if we can use it as a sync word

Best regards,

Daniel

header is fixed, 

tried the setting but no ok packet received.

getting spike in continous RX but not able to read packet

Hi Ravi,

You could try changing the symbol  rate to 4.2kbps and set the length config to a fixed value of 9 bytes.

Is it possible for you to set a spectrum analyzer in zero span mode and view the ASK modulation of the sensor?

Best regards,

Daniel

-37 db, but 00 as data 

this is the setting in which I am able to get this data 

tried A in fec code also... still

Hi Ravi,

It is hard to keep helping you if we don't know how the data is supposed to look, can you get a screenshot of a spectrum analyzer if you have one, or get all the RF parameters from the third party.

1. You mention ASK, what is the modulation depth.
2. Frequency, is it 433.92 MHz? Datasheet also mentions 315 MHz.
3. From one of your screenshots we are assuming a symbol rate of 4.2 Kbps (1/238.1us), can you confirm this? Also please do the test again with 4.2 instead of 4.8 Symbol Rate

Best regards,

Daniel

frequency is 433Mhz, tested on lesser bit rate 4.2 .. same condition

Thanks!

Is it possible you also provide a capture of a spectrum analyzer during a sensor transmission?

Best regards,

Daniel

Tip:

- Modulation depth is not relevant for this

- Preamble and sync is not manchester modulated on CC13xx, only the packet. Hence you need to do this differently. 

Thanks, that was very helpful. Got the data as per setting suggested, sometime a bit is shifted.. not decoding to my sensor id 98 D3 FB 2C

that one get the job done, Thanks.

Hi Ravi,

Good to hear!.

Best regards,

Daniel