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wl18xx to use both antennas for 2.4GHz

David Marqvar
Intellectual 300 points
Other Parts Discussed in Thread: WL1835, WL1837MOD

Hi,

We are trying to get the wl18xx (wl1835) to use both antennas for 2.4 GHz WLAN.
The board has 2 antennas for 2.4 GHZ, none for 5 GHz.

When ever we connect using a SISO device, only ANT1 is used. We've tested with wl18xx.ht.mode = 0x00 (MIMO) and wl18xx.ht.mode = 0x02 (SISO20).

Is it possible to get the two antennas to work together so that the module always uses the antenna with the best signal ?
- in other words, we are not interrested in multiple streams (MIMO), but one stream (SISO) from the antenna with the best signal.

Thank you.
BR, David

  • 0
    TI__Genius 16130 points

    Hi David,

    Can you try setting number of 2.4GHz antennae to 2 and SISO.

    Try the attached script and run on the target (remove the .txt extension) which takes as an argument the device version

    ./configure-device.sh wl1835

    Iain

  • 0 in reply to Iain Hunter
    Intellectual 300 points

    Hi Iain,

    Thank you.

    I've run the script and generated a _new_ conf file. Below is the difference to my current config. When I get to work tomorrow I'll modify it to be wl18xx.ht.mode = 0x02 (SISO20) and try this setup.

    Thanks,
    David

    diff /misc/wl18xx-conf-my.bin.txt /misc/wl18xx-conf-ti.bin.txt
    --- /misc/wl18xx-conf-my.bin.txt
    +++ /misc/wl18xx-conf-ti.bin.txt
    @@ -372,15 +372,15 @@
     core.hangover.window_size = 0x10
     core.recovery.bug_on_recovery = 0x00
     core.recovery.no_recovery = 0x00
    -wl18xx.ht.mode = 0x02
    +wl18xx.ht.mode = 0x00
     wl18xx.phy.phy_standalone = 0x00
     wl18xx.phy.spare0 = 0x08
     wl18xx.phy.enable_clpc = 0x00
     wl18xx.phy.enable_tx_low_pwr_on_siso_rdl = 0x00
     wl18xx.phy.auto_detect = 0x00
     wl18xx.phy.dedicated_fem = 0x00
    -wl18xx.phy.low_band_component = 0x02
    -wl18xx.phy.low_band_component_type = 0x04
    +wl18xx.phy.low_band_component = 0xff
    +wl18xx.phy.low_band_component_type = 0x05
     wl18xx.phy.high_band_component = 0x01
     wl18xx.phy.high_band_component_type = 0x09
     wl18xx.phy.number_of_assembled_ant2_4 = 0x02
    @@ -407,15 +407,15 @@
     wl18xx.phy.primary_clock_setting_time = 0x05
     wl18xx.phy.clock_valid_on_wake_up = 0x00
     wl18xx.phy.secondary_clock_setting_time = 0x05
    -wl18xx.phy.board_type = 0x02
    +wl18xx.phy.board_type = 0x04
     wl18xx.phy.psat = 0x00
    -wl18xx.phy.low_power_val = 0x08
    -wl18xx.phy.med_power_val = 0x12
    -wl18xx.phy.high_power_val = 0x18
    +wl18xx.phy.low_power_val = 0xff
    +wl18xx.phy.med_power_val = 0xff
    +wl18xx.phy.high_power_val = 0xff
     wl18xx.phy.per_sub_band_tx_trace_loss = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
     wl18xx.phy.per_sub_band_rx_trace_loss = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
     wl18xx.phy.tx_rf_margin = 0x01
    -wl18xx.phy.low_power_val_2nd = 0x05
    -wl18xx.phy.med_power_val_2nd = 0x0a
    -wl18xx.phy.high_power_val_2nd = 0x14
    +wl18xx.phy.low_power_val_2nd = 0xff
    +wl18xx.phy.med_power_val_2nd = 0xff
    +wl18xx.phy.high_power_val_2nd = 0xff
     wl18xx.phy.padding = 0x00

    Iain

  • 0 in reply to David Marqvar
    Intellectual 300 points

    I've tested using the new configuration file today - only change: wl18xx.ht.mode = 0x02.

    Behaviour is the same as before:
    * TX: only takes place one antenna.
    * RX: I have not determined if RX is done on one or both antennas (but as far as I can tell the module should be using MRC = both antennas for RX due to wl18xx.ht.mode=2 and wl18xx.phy.number_of_assembled_ant2_4=0x02.

    Is the output of the script you provided the values recommended by TI to use for wl1835?

    /David

  • 0 in reply to David Marqvar
    Intellectual 300 points

    Hi again,

    Just a follow up question.

    Per another answer in this forum, the WL8_System_parameters.ini has the correct values, and that shall be used. Ref.: http://e2e.ti.com/support/wireless_connectivity/f/307/p/361475/1270081.aspx

    The script you provided sets wl18xx.phy.low_band_component = 0xff (instead of 0x02 in WL8_System_parameters.ini).

    Can you explain why that is?

    /David

  • 0 in reply to David Marqvar
    TI__Guru* 85400 points

    Hi David,

    wl18xx.phy.low_band_component should be set as 0x2
    If you check the configure-device.sh script from the git, you can see that this parameter has been updated to "0x2"

    Regards,
    Gigi Joseph.

  • 0 in reply to Joseph Gigi
    Intellectual 300 points

    Hi Gigi,

    Thank you!

    BR, David

  • 0 in reply to David Marqvar
    Prodigy 240 points
    David,

    Did changing the ht mode and low band component fix your problem? I'm having the same issue but low+band_component is already at 0x02.

    Thanks,

    Kaitlyn
  • 0 in reply to Kaitlyn McKee
    TI__Guru* 85400 points
    Hi Kaitlyn,

    Can you please post a new query and give the below details:

    ***
    * Host platform (Sitara EVM, BeagleBone, etc.)
    * If TI Sitara, which SDK version is being used?
    * Operating system (Linux, Android, etc.)
    * WiLink™ flavor (WL1837MOD, etc.)
    * Module vendor, if any (TI, Jorjin, Murata, etc.)
    * WiLink™ firmware version (click here for more information)
    * WiLink software driver version (R8.5/6/7)
    * Any applicable logs including Wireshark sniffer logs, WLAN firmware (gLogger), BT firmware (logger), kernel logs, wlconf dump, supplicant logs
    ***

    Regards,
    Gigi Joseph.
  • 0 in reply to Kaitlyn McKee
    Intellectual 300 points

    Hi Kaitlyn,

    If you mean getting both antennas to be used for SISO, the answer is no, it is always using the same antenna for TX.

    BR, David