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M3 step 5: Sweep, the band's signal strength as bars and a waterfall

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Tab in the LoRa Scanner sweeps 863-870 MHz in 100 kHz steps (the
strongest of three RSSI readings at each, at 125 kHz), shown as bars with
peak hold over a waterfall, the Sniffer's frequency marked (Q98). The
Sweep pauses the Sniffer and keeps its packets; Tab resumes it (Q99).
Status Bar: SW. The floor, top and peaks are host-tested; `lora sweep
on|off|dump` prints them on the console.

At the desk: about 607 ms a pass, a flat floor at -100 to -102 dBm
(15 dB above the chip's own) and a steady carrier at 863.2 MHz.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
This commit is contained in:
twisla
2026-10-05 20:28:46 +02:00
co-authored by Claude Opus 5.5
parent 2fce79aebd
commit b1de0f8804
12 changed files with 425 additions and 12 deletions
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src/main.cpp
+15 -1
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@@ -109,7 +109,8 @@ static StatusInfo currentStatus() {
s.gnssSatellites = g.satellitesUsed;
s.tracking = gnssService->tracking();
}
if (radioService && radioService->listening()) {
if (radioService && radioService->sweeping()) s.radio = StatusInfo::Radio::Sweep;
else if (radioService && radioService->listening()) {
uint32_t last = radioService->lastPacketMs();
s.radio = last && millis() - last < 400 ? StatusInfo::Radio::Packet : StatusInfo::Radio::Listening;
}
@@ -364,6 +365,7 @@ static const char* const kHelp =
"log level <0-5> ESP-IDF log level (0 none ... 5 verbose)\n"
"lora probe | lora status | lora rx on|off | lora preset <name> the LoRa radio, receive only\n"
"lora capture start|stop a LoRa Capture to /captures/lora (pcap, LoRaTap)\n"
"lora sweep on [from MHz] [to MHz] [step kHz] | off | dump RSSI across a band (863 870 100)\n"
"lora custom <MHz> <BW kHz> <SF> <CR 5-8> <sync hex> [preamble] e.g. 868.1 125 7 5 34 8 (LoRaWAN)\n"
"gnss status | gnss restart | gnss track start|stop | gnss nmea on|off | gnss send <sentence without $ and checksum>\n"
"crash the last crash: firmware, reason, task, backtrace\n"
@@ -432,6 +434,18 @@ static void runCommand(String line) {
if (line == "lora probe" && radioService) radioService->probe(console);
if (line == "lora status" && radioService) radioService->printStatus(console);
if ((line == "lora rx on" || line == "lora rx off") && radioService) radioService->setEcho(line.endsWith("on"));
if (line.startsWith("lora sweep") && radioService) { // on [from MHz] [to MHz] [step kHz] | off | dump
if (line == "lora sweep dump") radioService->printSweep(console);
else if (line == "lora sweep off") {
radioService->setSweepEcho(false);
radioService->sweep(false);
} else if (line.startsWith("lora sweep on")) {
double from = 863, to = 870, step = 100;
sscanf(line.c_str() + 13, "%lf %lf %lf", &from, &to, &step);
radioService->setSweepEcho(true);
radioService->sweep(true, from * 1e6 + 0.5, to * 1e6 + 0.5, step * 1e3 + 0.5);
}
}
if (line == "lora capture start" && loraCapture) {
std::string why = loraCapture->start(millis());
console.printf("lora capture: %s\n", why.empty() ? loraCapture->path().c_str() : why.c_str());