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Original question:

CCS/CC1310: Are there some other recommendation for CC1310 sync word?

CCS/CC1310: Updates on testing for CC1310 sync word, but there is still some issue

Wenting Wu
Intellectual 2365 points
Part Number: CC1310


Tool/software: Code Composer Studio

Hello TER,

Thanks for your supports before. Here are some feedback on the testing, do you mind helping to review it again?

1. Because in the project, CC1310 is used for wireless MIC, so that the data will keep transferring and LBT mode is not suitable to avoid interference.

2. CCA method to search for frequency point has been used, however the distance is far ( 40 meters and there are two walls between) so there still is a possibility to search for the point with the same frequency.

3. After viewing the syncword file http://dev.ti.com/tirex/content/simplelink_cc13x0_sdk_3_20_00_23/docs/proprietary-rf/proprietary-rf-users-guide/proprietary-rf/packet-format.html#sync-word , 0x930B51DE is recommended. Based on the recommendation, new order sync words which have been tried are: 0xDE930B51，0xDE51930B，0xDE510B93，0x0B9351DE

4、The method, address check has also been used. But in smartrf and other file，there is no address check in "packet RX".

  • 0
    TI__Guru**** 317180 points

    What about frequency hopping or assigning the mics different channels?

    For address filtering, see the description of CMD_PROP_RX in Table 23-136 in http://www.ti.com/lit/ug/swcu117h/swcu117h.pdf.

    But: If you have two transmitters sending with similar strength on the same frequency, you will not be able to receive any of the them, this is basic RF. 

  • 0 in reply to TER
    TI__Intellectual 2365 points

    Hello TER,

    Thanks for your reply. Here are more RF specification on wireless MIC:

    1. Frequency point:725-780MHz，with the step is 3MHz，for example：720、723...

    2.data rate：500KHz/680KHz (both frequency has been used for different version software)

    3. During the production, customer found that 1% products with using 680 KHz have bad communication qualification. If transmitter and receiver are close to each other, the data will lose usually. If products with using 500KHz will not have this issue. 

    4. Multiple units are used in the same time so that wireless MIC will search for the best frequency point during starting and fix the frequency point during closing.

    5.During the testing,  if different sync words are used and even use the same frequency point, the interference between system will be reduced a lot.

     (As introduced before, the 0x930B51DE is recommended. Based on the recommendation, new order sync words which have been tried are: 0xDE930B51，0xDE51930B，0xDE510B93，0x0B9351DE)

    The customer still worries that different order sync words above they've tried whether are suitable for all CC1310.

  • 0 in reply to Wenting Wu
    TI__Guru**** 317180 points

    3) For the 1% of the units: At which RSSI does the communication start to fail? Do you have a PER vs RSSI curve?

    5) Is this related to the 1 % in 3) or is this for all units?