feat: New buttons for Icom Scope

internal/cat/cat.go

@@ -458,9 +458,10 @@ type IcomController interface {
 	SetMicGain(int) error
 	SetIcomSplit(bool) error
 	TuneATU() error
-	SetScope(bool) error     // enable/disable the spectrum-scope waveform stream
-	SetScopeMode(bool) error // true = fixed span, false = center-on-VFO
-	ScopeData() ScopeSweep   // latest assembled sweep (empty until enabled)
+	SetScope(bool) error         // enable/disable the spectrum-scope waveform stream
+	SetScopeMode(bool) error     // true = fixed span, false = center-on-VFO
+	SetScopeEdges(int64, int64) error // point the fixed scope at low..high Hz (centre/pan)
+	ScopeData() ScopeSweep       // latest assembled sweep (empty until enabled)
 	SetRIT(int) error        // RIT/ΔTX offset in signed Hz
 	SetRITOn(bool) error     // RIT on/off
 	SetXITOn(bool) error     // ΔTX (XIT) on/off

internal/cat/civ/civ.go

@@ -94,9 +94,10 @@ const (
 	SubScopeData  = 0x00 // waveform data frame (divided across several frames)
 	SubScopeOnOff = 0x10 // turn the scope display itself on/off (00/01)
 	SubScopeOn    = 0x11 // enable/disable waveform data output over CI-V (00/01)
-	SubScopeMode  = 0x14 // center/fixed mode (0=center, 1=fixed) — VERIFY on rig
-	SubScopeSpan  = 0x15 // span in center mode — VERIFY on rig
-	SubScopeEdge  = 0x16 // fixed-mode edge frequencies — VERIFY on rig
+	SubScopeMode    = 0x14 // center/fixed mode (0=center, 1=fixed)
+	SubScopeSpan    = 0x15 // span in center mode (±span/2 as 5 LE-BCD)
+	SubScopeEdge    = 0x16 // fixed-mode ACTIVE edge set 1-4 (vfo + set#)
+	SubScopeFixEdge = 0x1e // fixed-mode edge FREQUENCIES: [range][set#][low 5-BCD][high 5-BCD]
 
 	// CmdSwitch sub-commands.
 	SubSwPreamp = 0x02 // 0=off, 1=P.AMP1, 2=P.AMP2

internal/cat/icomserial.go

@@ -750,6 +750,58 @@ func (b *IcomSerial) SetScopeMode(fixed bool) error {
 	return nil
 }
 
+// icScopeRanges maps a frequency to the IC-7610's spectrum edge-frequency range
+// id (from Hamlib's ic7610 caps). SetScopeEdges needs it to address the right
+// fixed-edge memory. Each range spans a chunk of the tuning range.
+var icScopeRanges = []struct {
+	lo, hi int64
+	id     byte
+}{
+	{30_000, 1_600_000, 1}, {1_600_000, 2_000_000, 2}, {2_000_000, 6_000_000, 3},
+	{6_000_000, 8_000_000, 4}, {8_000_000, 11_000_000, 5}, {11_000_000, 15_000_000, 6},
+	{15_000_000, 20_000_000, 7}, {20_000_000, 22_000_000, 8}, {22_000_000, 26_000_000, 9},
+	{26_000_000, 30_000_000, 10}, {30_000_000, 45_000_000, 11}, {45_000_000, 60_000_000, 12},
+}
+
+// scopeRangeBCD returns the range id (as a 1-byte BCD) for a frequency, or 0 if
+// out of range.
+func scopeRangeBCD(freq int64) byte {
+	for _, r := range icScopeRanges {
+		if freq >= r.lo && freq < r.hi {
+			return byte(r.id/10)<<4 | byte(r.id%10) // 1-byte BCD (11 → 0x11)
+		}
+	}
+	return 0
+}
+
+// SetScopeEdges points the FIXED-mode scope at [low..high] by writing them into
+// the rig's fixed-edge memory (edge set 1) and making that set active. This is
+// how the panel's "centre on VFO" and pan ◀/▶ work: they just compute VFO±50 kHz
+// (and shift it) and set the edges — no dependence on the waveform decode. CI-V:
+// 0x27 0x14 fixed, 0x27 0x16 set 1 active, 0x27 0x1e [range][set][low][high].
+func (b *IcomSerial) SetScopeEdges(low, high int64) error {
+	if low <= 0 || high <= low {
+		return fmt.Errorf("icom scope: bad edges %d..%d", low, high)
+	}
+	rangeID := scopeRangeBCD((low + high) / 2)
+	if rangeID == 0 {
+		return fmt.Errorf("icom scope: freq out of range")
+	}
+	if b.dualScope {
+		_ = b.exec(civ.CmdScope, civ.SubScopeMode, 0x00, 0x01) // fixed mode (main)
+		_ = b.exec(civ.CmdScope, civ.SubScopeEdge, 0x00, 0x01) // activate edge set 1
+	} else {
+		_ = b.exec(civ.CmdScope, civ.SubScopeMode, 0x01)
+		_ = b.exec(civ.CmdScope, civ.SubScopeEdge, 0x01)
+	}
+	payload := append([]byte{civ.CmdScope, civ.SubScopeFixEdge, rangeID, 0x01}, civ.FreqToBCD(low)...)
+	payload = append(payload, civ.FreqToBCD(high)...)
+	b.scopeMu.Lock()
+	b.scopeFixed = true
+	b.scopeMu.Unlock()
+	return b.exec(payload...)
+}
+
 // SetRIT sets the RIT/ΔTX offset (signed Hz, ±9999).
 func (b *IcomSerial) SetRIT(hz int) error {
 	if err := b.exec(append([]byte{civ.CmdRIT, civ.SubRITFreq}, civ.RITToBCD(hz)...)...); err != nil {