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LP-EM-CC2340R5: The minimum interval between two generic tx operation

zhengquan tang
Prodigy 65 points
Part Number: LP-EM-CC2340R5
Other Parts Discussed in Thread: ENERGYTRACE

Hi，

I would like to know what is the minimum interval between two generic tx operation?

Thanks

  • 0
    TI__Mastermind 35070 points

    Hi,

    For back-to-back TX, from end of one TX to the start of next TX, it takes about 281usec.

    This is based on the SDK example rfPacketTx and EnergyTrace current consumption waveform.

    Thanks,
    Toby

  • 0 in reply to Toby
    Prodigy 65 points

    Hi, 

    I measure DIO11(TX), from end of tx signal to start of next tx signal ,it takes about 339us, this is based on the SDK example rfPacketTx. Is there any possible to reduce this interval?

    Thanks

  • 0
    Prodigy 11 points

    Hi, Toby, the same question with the topic. 
    We want to devise a proprietary protocol with large number of packets but with very short packet length (for example 4-8bytes). We need a super short tx to tx interval to maximized the wireless channel effeciency.

    In rfPacketTx example, after you submit a tx, it seems to do a lot of initialization before the real "start_tx" command. Is there any other way to initialized one time, and then do the update tx buffer and sending repeatly. We tested the rfPacketTxRepeat, the interval for two tx is only 130us more or less. Do we have other ways to further reduce the interval.

  • 0 in reply to li Wen
    TI__Mastermind 35070 points

    You can potentially try to keep the FS on after a TX command.

    This is configured with the RCL_CMD_GENERIC_TX_t --> config --> fsOff.
    I think this would give about the same performance as RCL_CmdGenericTxRepeat.

    If more improvements to speed are needed, then you may have to customize the interface between application and radio (higher development cost).
    The source files for this are located here: C:\ti\simplelink_lowpower_f3_sdk_7_40_00_64\source\ti\drivers\rcl