Hard to scan the SSID and cannot connect to the openwifi

[HC153Yuanyuan]

My board is antsdr b220. I am running the openwifi project and found that when I working in 5GHz, the sniffer could not capture any beacon. When I switched to 2.4GHz, although I could capture beacon frame through wireshark, it was difficult for the phone to scan the SSID. When I try to connect, it always fails.

What do you think about this ？

[HC153Yuanyuan]

[HC153Yuanyuan]

Frequency spectrum

[MicroPhase]

The older version of antsdr is not officially support supported by openwifi. This due to the lvds interface. The openwifi needs 40MSPS sample rate at lvds interface, however the antsdr-b220 not originally designed with an LVDS interface, so there were some hardware limitations. You need to change the change the linux kernel for digital Interface Timing Verification, and maybe also need to edit the openwifi project with a lower sample rate.

[JiaoXianjun]

Frequency spectrum

Hello, This spectrum is due to the offset tuning: https://github.com/open-sdr/openwifi/blob/master/doc/README.md#analog-and-digital-frequency-design

You can fix the spectrum in this quick way (We are working on the final solution):

1. Replace this line: https://github.com/open-sdr/openwifi/blob/c63537c4fbd39557a6010359c32c75673c74c5d8/driver/sdr.c#L2072 to

   priv->tx_intf_cfg = TX_INTF_BW_20MHZ_AT_0MHZ_ANT0;

2. Replace this line: https://github.com/open-sdr/openwifi/blob/c63537c4fbd39557a6010359c32c75673c74c5d8/user_space/openwifi_ad9361_fir.ftr#L6 to

   BWTX 20172411

3. Replace this line: https://github.com/open-sdr/openwifi/blob/c63537c4fbd39557a6010359c32c75673c74c5d8/user_space/rf_init.sh#L57 to

   echo 1 > out_voltage_filter_fir_en

4. Recompile the sdr driver, and copy all the new .ko files, openwifi_ad9361_fir.ftr and rf_init.sh onto the board. Then run your normal test. You should see spectrum like this:

[HC153Yuanyuan]

The older version of antsdr is not officially support supported by openwifi. This due to the lvds interface. The openwifi needs 40MSPS sample rate at lvds interface, however the antsdr-b220 not originally designed with an LVDS interface, so there were some hardware limitations. You need to change the change the linux kernel for digital Interface Timing Verification, and maybe also need to edit the openwifi project with a lower sample rate.

Should I do the IO timing calibration by myself？ or it has been done by ADI driver

[HC153Yuanyuan]

Frequency spectrum

Hello, This spectrum is due to the offset tuning: https://github.com/open-sdr/openwifi/blob/master/doc/README.md#analog-and-digital-frequency-design

You can fix the spectrum in this quick way (We are working on the final solution):

1. Replace this line: https://github.com/open-sdr/openwifi/blob/c63537c4fbd39557a6010359c32c75673c74c5d8/driver/sdr.c#L2072 to

priv->tx_intf_cfg = TX_INTF_BW_20MHZ_AT_0MHZ_ANT0;

1. Replace this line: https://github.com/open-sdr/openwifi/blob/c63537c4fbd39557a6010359c32c75673c74c5d8/user_space/openwifi_ad9361_fir.ftr#L6 to

BWTX 20172411

1. Replace this line: https://github.com/open-sdr/openwifi/blob/c63537c4fbd39557a6010359c32c75673c74c5d8/user_space/rf_init.sh#L57 to

echo 1 > out_voltage_filter_fir_en

1. Recompile the sdr driver, and copy all the new .ko files, openwifi_ad9361_fir.ftr and rf_init.sh onto the board. Then run your normal test. You should see spectrum like this:

Thank you for your suggestion. I made modified follow these, but i still cant scan the openwifi ssid in my phone. I think it may be other problems.

[JiaoXianjun]

If no further questions, I will close this issue.