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pre trigger length 0 (wh11d0) goes into some coner case.

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Change it to more safe value > 0. (At least 1!)
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Jiao Xianjun 2022-06-21 11:26:04 +02:00 committed by GitHub
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commit 05506cbaa0
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doc/app_notes/packet-iq-self-loopback-test.md
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@ -27,8 +27,8 @@ want to understand openwifi side channel (for IQ and CSI) deeper.
./monitor_ch.sh sdr0 44
(Setup monitor mode in WiFi channel 44. You should find a channel as clean as possible in your location)
insmod side_ch.ko iq_len_init=8187
./side_ch_ctl wh11d0
(Set 0 to register 11. It means the pre trigger length is 0, so we only capture IQ after trigger condition is met)
./side_ch_ctl wh11d100
(Set 100 to register 11. It means the pre trigger length is 100, so we mainly capture IQ after trigger condition is met)
./side_ch_ctl wh8d16
(Set 16 to register 8 -- set trigger condition to phy_tx_started signal from openofdm tx core)
./sdrctl dev sdr0 set reg xpu 1 1