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Communication between CC1121 and CC1190

Vishal Algure
Prodigy 185 points
Other Parts Discussed in Thread: CC1121, CC1190

Hi,

We have two designs

1) MSP430 + CC1121(low power).

2) MSP430 + CC1121 + CC1190(high power).

Problem: My 2 low power devices are communicating with each other and same my 2 high power devices are also communicating with each other.

But when I do communication between low power and high power i am getting CRC errors. Mainly I am getting CRC error when my number bytes transmitted per packets is more than 15 bytes.

Please suggest.

 

Thanks and regards,

Vishal

  • 0
    TI__Mastermind 27145 points

    Hi,

    How far your Tx and Rx boards? If there are nearby and if you are using full power, it might compress the receiver. You may try the following.

    • Reduce the Tx power on CC1121+CC1190
    • Increase the board to board distance

    Thanks,

    PM

  • 0 in reply to PM
    TI__Guru**** 317180 points
    PM, this is probably not saturation since two CC1121+CC1190 boards communicate. And I have never managed to get this combo to saturate.
    Vishal: Have you checked the center frequency on the two different types of boards? It could be that the frequency is slightly offset. Check if increasing the RX BW helps. Also, are the data you send white? Please post your settings.
  • 0 in reply to TER
    Prodigy 185 points

    Hi TER,

    I also think that this is not problem of receiver saturation.

    Yes I already checked the center frequency and it is same for both boards of high power and low power devices.

    Currently RX bandwidth is 200 KHz, Can we increase bandwidth more than 200 KHz?

    Please find the attached files for settings of CC1121 and CC1190.

    smartrf_CC1120_868mhz_200kbps_4gfsk_HP.h 

    Thanks and regards,

    Vishal

  • 0 in reply to Vishal Algure
    TI__Guru**** 317180 points
    Do you get the same issue if you use the 38.4 kbps settings from SmartRF Studio?

    I'm wondering if it's the high datarate that for some reason generate some issues.