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how can we make BLE off....

Sandeep Niraula1
Prodigy 120 points
Other Parts Discussed in Thread: CC2540, CC2541

Hello all,

I am using CC2540 development kit for my project. I would like to use cc2540 not only for BLE communication but also to receive WLAN signals. So is it possible to make BLE sleep(off) and use our own stack for WLAN to get the RSSI(receiver signal strength indicator ) value for WLAN. The idea is to receive  the RSSI value of WLAN by making BLE off and send these value via BLE(after making ON) using same TX/RX port. Is this possible . Can anyone address my problem. 

Thank you in advance

Sandeep

  • 0
    Guru 22270 points

    Hello Sandeep,

    That sounds like an interesting idea.  I am not familiar enough with the WLAN RSSI to give a definitive answer, but CC2540 Bluetooth BLE device was specifically set up to avoid conflict with WiFi operating in that frequency range.  With the CC2541, it may be possible since it does have a proprietary mode for the radio.  

    In theory, you could switch to proprietary mode, take your reading and the switch back to BLE.  This you would have to do some searching on to see how flexible the WLAN radio you are using is.  In the User Guide, there is a section that covers the radio for both devices.  

    You will have to compare the available modulation format of the WLAN to see if it has GSFK or MSK modulation which the CC2541 uses.

    Thanks,

  • 0 in reply to Greenja
    Guru 18605 points

    I do not think you need to do anything related to 802.11 modulation if you work in propietary mode.

  • 0 in reply to kazola
    Prodigy 120 points

    thank you guys for your help.

    @  -can you please make me a bit clear about what you said "I do not think you need to do anything related to 802.11 modulation if you work in propietary mode."

    Thanks in advance 

  • 0
    TI__Mastermind 29650 points

    Hi Sandeep,

    You cannot use CC2540/41 to transmit WLAN signals as the modem supports only GFSK/MSK modulation and Wifi uses DSSS (802.11b) or OFDM(802.11g/n).
    In addition, the WLAN channels have a much higher bandwidth than the CC2540/41 supports and e.g. 802.11n might also be using 5GHz which the devices does not support.

    I would recommend to use the CC3000 module if 802.11b/g support is needed.

    Regards,
    Svend