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open-sdr / openwifi

open-source IEEE 802.11 WiFi baseband FPGA (chip) design: driver, software
GNU Affero General Public License v3.0
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CSI capture condition #342

Closed kebZhang closed 9 months ago

kebZhang commented 9 months ago

Hi Dr.Jiao

I use an openwifi(antsdr) to perform as an AP, an openwifi(antsdr) to perform as a client. And I use simple socket program running on two boards to communicate with each other by tcp packets. I want to capture the CSI information of tcp packets which are transmitted by two openwifi.

I have found that the FC field of tcp packet is 0x8802. image

So I run the code below:

./side_ch_ctl wh1h1001
./side_ch_ctl wh5h8802
./side_ch_ctl g

But the boards output like

loop 64 side info count 0
loop 128 side info count 0
...

I think it means that I can't get any CSI information with this condition.

Could you please help me?

JiaoXianjun commented 9 months ago

If you do not set the condition, can you capture CSI? Could you try the 0x8802 with inverted bit order, or byte order?

kebZhang commented 9 months ago

I have succeeded in capturing the specific CSI by inverting the byte order. Thank you!