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Make set_lbt_th.sh output more human friendly:

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While no argument is given (for checking)
This commit is contained in:
Xianjun Jiao 2023-02-09 16:09:11 +01:00
parent 3d0e9e61c8
commit 6faed2c4d0
2 changed files with 7 additions and 2 deletions
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6
doc/app_notes/frequent_trick.md
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@ -20,22 +20,26 @@ Some usual/frequent control trick over the openwifi FPGA. You need to do these c
In normal operation, different threshold is set to FPGA according to the different calibration of different frequency/channel by driver automatically. Show the current LBT threshold in FPGA:
```
./set_lbt_th.sh
dmesg
```
"reg val: 00000086" means the current threshold is 134 (86 in Hex). Its unit is rssi_half_db. Check rssi_half_db_to_rssi_dbm()/rssi_dbm_to_rssi_half_db() in sdr.c to see the relation to rssi dBm.
It shows: "sdr,sdr FPGA LBT threshold 166(-62dBm). The last_auto_fpga_lbt_th 166(-62dBm). rssi corr 145". Check rssi_half_db_to_rssi_dbm()/rssi_dbm_to_rssi_half_db() in sdr.c to see the relation to rssi dBm.
Override a new threshold -NNdBm to FPGA, for example -70dBm:
```
./set_lbt_th.sh 70
dmesg
```
Above will disable the automatic CCA threshold setting from the openwifi driver.
Recover the driver automatic control on the threshold:
```
./set_lbt_th.sh 0
dmesg
```
Disable the CCA by setting a very strong level as threshold, for example -1dBm:
```
./set_lbt_th.sh 1
dmesg
```
After above command, the CCA engine will always believe the channel is idle, because the rx signal strength not likely could exceed -1dBm.

3
user_space/set_lbt_th.sh
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@ -13,5 +13,6 @@ if [ $lbt_th -ne 987654321 ]; then
fi
# show
./sdrctl dev sdr0 get reg xpu 8
# ./sdrctl dev sdr0 get reg xpu 8
./sdrctl dev sdr0 get reg drv_xpu 0
set +x