Fix G2 position/RSSI parsers, document motor and DVB test results
Position parser now matches the actual Angle[0]/Angle[1] format instead of falling back to fragile raw-float extraction. RSSI parser uses a proper named-group regex matching the real firmware output format (Reads:<n> RSSI[avg: <v> cur: <v>]) — the old index-based approach would fail on the actual 5-field response. Motor test results: both axes move correctly, direction-dependent overshoot of 0.01-0.06 degrees confirmed. DVB subsystem explored: BCM4515 Rev B0, firmware v113.37, full command set documented including DiSEqC 2.x, transponder scanning, and streaming AGC/SNR. RSSI noise floor is ~500.
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@ -153,6 +153,141 @@ From homing output: `wrap_min:-42333 wrap_max:2333`
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- In centidegrees: -423.33° to +23.33° from home position
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- Total range: 446.66° (~1.24 full rotations)
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## Motor Control
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### Position Query
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In the `MOT>` submenu, `a` returns position with 4-space indentation:
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```
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a
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Angle[0] = 180.00 ← AZ (degrees)
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Angle[1] = 45.00 ← EL (degrees)
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MOT>
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```
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### Move Command
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`a <id> <deg>` returns a confirmation (no array index) and the prompt immediately
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while the motor moves in the background:
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```
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a 1 46
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Angle = 46.00
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MOT>
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```
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### Observed Motor Behavior
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| Test | Command | Target | Actual | Overshoot |
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|------|---------|--------|--------|-----------|
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| EL move out | `a 1 46` | 46.00 | 46.05 | +0.05° |
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| AZ move out | `a 0 181` | 181.00 | 181.01 | +0.01° |
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| EL return | `a 1 45` | 45.00 | 44.94 | -0.06° |
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| AZ return | `a 0 180` | 180.00 | 179.98 | -0.02° |
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Direction-dependent overshoot: the motor consistently overshoots in the
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direction of travel, undershooting on return. This is classic stepper
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backlash + PID settling behavior and is what the leapfrog algorithm
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compensates for.
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## DVB Subsystem (BCM4515)
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### Hardware
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```
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BCM Hardware= ID: 0x4515 VER: 0xB0
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BCM Firmware= MAJOR VER: 0x71 (113) MINOR VER: 0x25 (37)
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BCM Strap Config: 0x25018
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```
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### Channel Parameters (`dis`)
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```
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Power Mode: ON
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Search Transponders: ON
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Auto Search Mode: 1
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Shuffle Mode: ON
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Frequency List: Non-Stacked
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Num Parameter Current Default
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1 Frequency 1090640 (kHz) 974000 (kHz)
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2 Symbol Rate 0 (PeakScanEnabled) 20000 (ksps)
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3 Trans_Mod_CRate blind_scan blind_scan
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4 Blind Scan Mode ___trb_dvb_dss_____ ___trb_dvb_dss_____
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5 LNB Polarity ODU:13V ---
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6 LNB Tone (ODU) off off
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7 Roll-off 0.35 0.35
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8 LPF Cutoff 0 (auto) 0 (MHz)
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9 Carrier Offset 0 (kHz) 0 (kHz)
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10 FreqSearchRange 5000 (kHz) 5000 (kHz)
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11 DCII Mode dcii_qpsk_comb dcii_qpsk_comb
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12 Spectral Inv scan scan
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13 PScnSymRtRngMin 18000 (ksps) 18000 (ksps)
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14 PScnSymRtRngMax 24000 (ksps) 24000 (ksps)
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15 SignalDetectMode off off
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```
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### RSSI Response Format
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```
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rssi 5
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iterations:5 interval(msec):20
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Reads:5 RSSI[avg: 500 cur: 500]
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DVB>
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```
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500 is the noise floor (no signal lock, dish pointed at arbitrary sky).
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### LNB Voltage
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`lnbdc odu` enables LNA at 13V. `lnbv` streams continuous voltage readings:
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```
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Reads:1 LNB Voltage (mV): 13239 ( ADC value: 119 )
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Reads:2 LNB Voltage (mV): 13182 ( ADC value: 118 )
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...
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```
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Stable at ~13.11V (ADC 117). Boot default is 18V; `lnbdc odu` switches to 13V.
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13V = vertical polarization, 18V = horizontal polarization on a standard LNB.
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### AGC (Streaming)
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`agc` streams RF and IF automatic gain control plus SNR/NID:
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```
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Reads:1 RF_AGC[avg: 1327353088 cur: 1327353088] IF_AGC[avg: 2684354560 cur: 2684354560] SNR: 0.0 NID: FFFF/none
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```
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- RF_AGC values are raw BCM4515 32-bit register values
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- IF_AGC constant at 0xA0000000 (fixed IF gain)
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- SNR: 0.0 when no signal lock
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- NID: FFFF/none = no DVB network ID detected
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### DVB Command Reference
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| Command | Type | Description |
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|---------|------|-------------|
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| `rssi <n>` | One-shot | Average signal strength over n samples |
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| `snr` | Unknown | SNR level |
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| `agc` | Streaming | RF/IF AGC + SNR + NID (runs until interrupted) |
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| `lnbdc odu` | One-shot | Enable LNB in ODU mode (13V) |
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| `lnbv` | Streaming | Continuous LNB voltage monitoring |
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| `ls` | Unknown | Lock status |
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| `qls` | Unknown | Quick lock status |
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| `config` | One-shot | BCM hardware/firmware version |
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| `dis` | One-shot | Display channel parameters |
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| `freqs` | One-shot | Tuner frequency list |
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| `diag` | Unknown | Diagnostic data |
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| `t <n>` | One-shot | Select transponder |
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| `table` | One-shot | Generate transponder table |
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| `e <n> <v>` | One-shot | Edit channel parameter |
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| `di2*` | One-shot | DiSEqC 2.x LNB commands |
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| `send <hex>` | One-shot | Raw DiSEqC packet (max 6 bytes) |
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Streaming commands (`agc`, `lnbv`) run until a new command or `q` interrupts them.
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## Satellite Configuration
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```
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