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Remove spectal scan (#441)

This commit is contained in:
Tim Wilkinson 2022-08-02 19:27:31 -07:00 committed by GitHub
parent 102c4112c0
commit 4426aa8016
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 0 additions and 178 deletions
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178
files/www/cgi-bin/scan
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@ -45,8 +45,6 @@ if not node then
node = "NOCALL"
end
local wifiiface = aredn.hardware.get_iface_name("wifi")
local phy = iwinfo.nl80211.phyname(wifiiface)
local rfband = aredn.hardware.get_rfband()
local nf = iwinfo.nl80211.noise(wifiiface) or -95
if not nixio.fs.stat("/tmp/web") then
@ -56,7 +54,6 @@ end
-- scan start
local scanned = {}
os.execute("echo 'chanscan' > /sys/kernel/debug/ieee80211/" .. phy .. "/ath9k/spectral_scan_ctl")
local f = io.popen("iw dev " .. wifiiface .. " scan passive")
if f then
local scan
@ -100,9 +97,6 @@ if f then
f:close()
end
local samples = io.open("/sys/kernel/debug/ieee80211/" .. phy .. "/ath9k/spectral_scan0", "rb"):read("*a")
os.execute("echo 'disable' > /sys/kernel/debug/ieee80211/" .. phy .. "/ath9k/spectral_scan_ctl")
local f = io.popen("iw dev " .. wifiiface .. " station dump")
if f then
local scan
@ -254,177 +248,5 @@ do
end
html.print("</table><br></center>")
-- Spectral information
local cwidth = 800;
local cheight = 400;
html.print([[
<center style="font-family: Arial">
<div style="padding:8px">Spectral View</div>
<div style="position:relative;display:inline-block">
<div style="position:absolute;top:200px;left:-35px;transform:rotate(-90deg)">SNR</div>
<canvas id="spectral" width="]] .. cwidth .. [[" height="]] .. cheight .. [[" style="border:1px solid grey;background-color:white"></canvas>
<div style="position:absolute;display:inline-block;vertical-align:top;text-align:left;top:6px;left:35px;background-color:white;border:solid 1px grey;padding:10px;font-size:12px;line-height:16px">
<div><span style="background-color:mediumpurple">&nbsp;&nbsp;&nbsp;</span> 5% of traffic</div>
<div><span style="background-color:yellow">&nbsp;&nbsp;&nbsp;</span> 95% of traffic</div>
<div><span style="background-color:red">&nbsp;&nbsp;&nbsp;</span> Ambient noise</div>
</div>
</div>
<div style="padding:4px">Channel</div>
</center>
<script>
const canvas = document.getElementById("spectral");
const ctx = canvas.getContext("2d");
]]);
function u8tos8(b)
return b >= 128 and b - 256 or b
end
local cnf = nf - 17.5 -- sub-carrier noise floor
if bw == 10 then
cnf = cnf - 3
elseif bw == 5 then
cnf = cnf - 6
end
local start_freq
local end_freq
if rfband == "900" then
start_freq = 902
end_freq = 925
html.print("const freq2chan = (f) => (f - 887) / 5;");
elseif rfband == "2400" then
start_freq = 2377
end_freq = 2477
html.print("const freq2chan = (f) => (f - 2407) / 5;");
elseif rfband == "3400" then
-- transverted
start_freq = 5370
end_freq = 5505
html.print("const freq2chan = (f) => (f - 5000) / 5;");
else
start_freq = 5650
end_freq = 5920
html.print("const freq2chan = (f) => (f - 5000) / 5;");
end
local bw = 10
local fbuckets = {}
for freq = 1, (end_freq - start_freq + bw) * 56 / bw
do
fbuckets[math.floor(freq)] = {}
end
local xscale = cwidth / (end_freq - start_freq)
local min_sig = -125
local max_sig = -60
local i = 1
while i < #samples
do
local t = samples:byte(i)
local l = samples:byte(i + 1) * 256 + samples:byte(i + 2)
if t == 1 then
local max_exp = samples:byte(i + 3)
local freq = samples:byte(i + 4) * 256 + samples:byte(i + 5)
if freq >= start_freq and freq <= end_freq then
local rssi = u8tos8(samples:byte(i + 6))
local noise = u8tos8(samples:byte(i + 7))
local datasqsum = 0
local v = {}
for dptr = 1,56
do
local data = nixio.bit.lshift(samples:byte(dptr + i + 19), max_exp)
data = data * data
datasqsum = datasqsum + data
v[dptr] = data
end
for dptr = 1,56
do
local datasq = v[dptr]
if datasq ~= 0 then
local sig = noise + rssi + 10 * math.log10(datasq / datasqsum)
if sig >= min_sig then
if sig > max_sig then
max_sig = sig
end
local bidx = math.floor((freq - start_freq) / bw * 56 + dptr - 28)
local bucket = fbuckets[bidx]
if bucket then
bucket[#bucket + 1] = math.floor((sig - min_sig) * 4)
end
end
end
end
end
end
i = i + 3 + l
end
for _, b in ipairs(fbuckets)
do
table.sort(b)
end
html.print("const n = null;")
html.write("const p=[")
for _, b in ipairs(fbuckets)
do
if #b > 0 then
local l = b[1 + math.floor(#b * 0.50)]
local m = b[1 + math.floor(#b * 0.95)]
local h = b[#b]
html.write(l .. "," .. (m-l) .. "," .. (h-m) .. ",")
end
html.write("n,")
end
html.print("n];")
html.print("const yscale = " .. (-cheight / (max_sig - min_sig) / 4) .. ";")
html.print([[
const bcolors = [ "red", "yellow", "mediumpurple" ];
let xcursor = 0;
let ycursor = 0;
let ccursor = 0;
for (let i = 0; i < p.length; i++) {
let v = p[i];
if (v === null) {
xcursor += ]] .. (xscale * bw / 56) .. [[;
ycursor = 0;
ccursor = 0;
}
else {
v *= yscale;
ycursor += v;
ctx.fillStyle = bcolors[ccursor];
// ctx.fillRect(xcursor, ]] .. cheight .. [[ + ycursor, ]] .. (xscale * bw / 56) .. [[, -v);
ctx.fillRect(xcursor, ]] .. cheight .. [[ + ycursor, 1, -v);
ccursor++;
}
}
ctx.strokeStyle = "rgba(0,0,0,0.5)";
ctx.fillStyle = "black";
ctx.font = "bold 12px Arial";
ctx.textAlign = "center";
ctx.beginPath()
for (let f = ]] .. start_freq .. [[; f <= ]] .. end_freq .. [[; f += 10) {
const x = Math.floor((f - ]] .. start_freq .. [[) * ]] .. xscale .. [[);
ctx.moveTo(x, 0);
ctx.lineTo(x, ]] .. (cheight - 20) .. [[);
ctx.fillText("" + freq2chan(f), x, ]] .. cheight - 4 .. [[);
}
ctx.stroke();
ctx.textAlign = "left";
ctx.strokeStyle = "rgba(0,0,0,0.5)";
ctx.beginPath();
for (let snr = 60; snr >= 0; snr -= 10) {
const y = ]] .. cheight .. [[ + yscale * (snr - ]] .. (min_sig - cnf) .. [[) * 4;
ctx.moveTo(20, y);
ctx.lineTo(]] .. cwidth .. [[, y);
ctx.fillText("" + snr, 2, y);
}
ctx.stroke();
</script></form>
]])
html.footer()
html.print("</body></html>")