refactor: StreamReader ASCII decoder uses shared sensor_count_for()

src/pygui/ISC/HomePage.qml

@@ -22,6 +22,7 @@ Rectangle {
     onSelectedTabIndexChanged: {
         if (selectedTabIndex === 2) {
             file_browser.refreshFiles();
+            streamController.unloadFile()
         }
     }
 
@@ -36,7 +37,9 @@ Rectangle {
         function onParsedDataReady(result) {
             if (result.success && result.csv_path) {
                 streamController.loadFile(result.csv_path)
+                if (root.selectedTabIndex === 0) {
                 root.selectedTabIndex = 2
+                }
             }
         }
     }
@@ -74,6 +77,11 @@ Rectangle {
         }
     }
 
+    // ===== Split Dialog (Threshold Segmentation) =====
+    SplitDialog {
+        id: splitDialog
+    }
+
     // ===== Settings Popup =====
     Popup {
         id: settingsPopup
@@ -300,7 +308,7 @@ Rectangle {
                         StackLayout {
                             Layout.fillWidth: true
                             Layout.fillHeight: true
-                            currentIndex: root.selectedTabIndex
+                            currentIndex: root.selectedTabIndex === 0 ? 0 : 1
 
                             // ── Status tab: Hardware Actions ────────────────
                             ColumnLayout {
@@ -320,7 +328,7 @@ Rectangle {
                                     label: "DETECT WAFER"
                                     iconSource: "../icons/detect.svg"
                                     Layout.fillWidth: true
-                                    enabled: !deviceController.isDetecting
+                                    enabled: !deviceController.operationInProgress
                                     onClicked: root._doDetect()
                                 }
 
@@ -345,44 +353,6 @@ Rectangle {
                                 Item { Layout.fillHeight: true }
                             }
 
-                            // ── Data tab: Data Operations ───────────────────
-                            ColumnLayout {
-                                spacing: 6
-
-                                Label {
-                                    text: "DATA OPERATIONS"
-                                    color: Theme.sideMutedText
-                                    font.family: Theme.uiFontFamily
-                                    font.pixelSize: Theme.fontSm
-                                    topPadding: 6
-                                    font.letterSpacing: 1.5
-                                    font.bold: true
-                                }
-
-                                RailActionButton {
-                                    label: "OPEN IN EXCEL"
-                                    iconSource: "../icons/excel.svg"
-                                    Layout.fillWidth: true
-                                    onClicked: deviceController.openCsvFile()
-                                }
-
-                                RailActionButton {
-                                    label: "COMPARE CSV"
-                                    iconSource: "../icons/compare.svg"
-                                    Layout.fillWidth: true
-                                    onClicked: console.log("[P3.1] Compare dialog not yet built")
-                                }
-
-                                RailActionButton {
-                                    label: "SPLIT DATA"
-                                    iconSource: "../icons/split.svg"
-                                    Layout.fillWidth: true
-                                    onClicked: console.log("[P3.2] Split dialog not yet built")
-                                }
-
-                                Item { Layout.fillHeight: true }
-                            }
-
                             // ── Map tab: Source file browser ──────────────
                             SourcePanel {
                                 Layout.fillWidth: true
@@ -637,6 +607,7 @@ Rectangle {
                     active: StackLayout.index === root.selectedTabIndex
                 }
                 Loader {
+                    id: dataTabLoader
                     source: "Tabs/DataTab.qml"
                     active: StackLayout.index === root.selectedTabIndex
                 }

src/pygui/ISC/Tabs/GraphTab.qml

@@ -1,222 +0,0 @@
-import QtQuick
-import QtQuick.Controls
-import QtQuick.Layouts
-import ISC
-import ISC.Wafer
-
-// ===== Graph Tab =====
-// Displays sensor temperature line charts using GraphQuickItem.
-// Gets data from deviceController.getChartData() (parsed CSV, batch read)
-// or from streamController.trendData (live streaming trend).
-Item {
-    id: root
-    anchors.fill: parent
-
-    property var _chartData: null   // cached result from getChartData()
-
-    ColumnLayout {
-        anchors.fill: parent
-        anchors.margins: Theme.panelPadding
-        spacing: Theme.rightPaneGap
-
-        // ── Toolbar ───────────────────────────────────────────────────────────
-        RowLayout {
-            Layout.fillWidth: true
-            spacing: 10
-
-            Label {
-                text: "Line Chart"
-                color: Theme.headingColor
-                font.pixelSize: Theme.fontSm
-                font.bold: true
-                Layout.alignment: Qt.AlignVCenter
-            }
-
-            Item {
-                Layout.fillWidth: true
-            }
-
-            // Refresh button — pulls data from deviceController
-            Button {
-                id: refreshBtn
-                text: "REFRESH"
-                font.pixelSize: Theme.fontXs
-                font.weight: Font.Medium
-                implicitHeight: 26
-                implicitWidth: 72
-                hoverEnabled: true
-                background: Rectangle {
-                    color: parent.hovered ? Theme.buttonNeutralHover : Theme.buttonNeutralBackground
-                    border.color: Theme.cardBorder
-                    border.width: 1
-                    radius: Theme.radiusSm
-                }
-                contentItem: Text {
-                    text: parent.text
-                    color: Theme.headingColor
-                    font: parent.font
-                    horizontalAlignment: Text.AlignHCenter
-                    verticalAlignment: Text.AlignVCenter
-                }
-                onClicked: reloadData()
-            }
-        }
-
-        // ── Mode selector (Trend / Full chart) ─────────────────────────────
-        RowLayout {
-            Layout.fillWidth: true
-            spacing: 8
-
-            Label {
-                text: "Source:"
-                color: Theme.bodyColor
-                font.pixelSize: Theme.fontXs
-                Layout.alignment: Qt.AlignVCenter
-            }
-
-            ComboBox {
-                id: sourceSelector
-                model: ["Parsed Data", "Live Trend"]
-                currentIndex: 0
-                implicitHeight: 26
-                font.pixelSize: Theme.fontXs
-                background: Rectangle {
-                    color: Theme.fieldBackground
-                    border.color: Theme.fieldBorder
-                    border.width: 1
-                    radius: Theme.radiusSm
-                }
-                contentItem: Text {
-                    text: sourceSelector.displayText
-                    color: Theme.fieldText
-                    font: sourceSelector.font
-                    horizontalAlignment: Text.AlignLeft
-                    verticalAlignment: Text.AlignVCenter
-                    leftPadding: 8
-                }
-                onCurrentIndexChanged: reloadData()
-            }
-
-            Item {
-                Layout.fillWidth: true
-            }
-
-            Label {
-                id: statusLabel
-                text: "Ready"
-                color: Theme.bodyColor
-                font.pixelSize: Theme.fontXs
-                font.italic: true
-                Layout.alignment: Qt.AlignVCenter
-            }
-        }
-
-        // ── Chart Area ─────────────────────────────────────────────────────────
-        Rectangle {
-            Layout.fillWidth: true
-            Layout.fillHeight: true
-            color: Theme.cardBackground
-            border.color: Theme.cardBorder
-            border.width: 1
-            radius: Theme.radiusMd
-            clip: true
-
-            GraphQuickItem {
-                id: graph
-                anchors.fill: parent
-                anchors.margins: 2
-                backgroundColor: Theme.cardBackground
-                gridColor: Theme.softBorder
-                axisColor: Theme.bodyColor
-                textColor: Theme.headingColor
-                seriesColors: [Theme.sensorLow, Theme.sensorHigh, Theme.sensorInRange, "#FFA726", "#AB47BC", "#00BCD4"]
-                showLegend: true
-            }
-        }
-    }
-
-    // ── Data Loading ────────────────────────────────────────────────────────────
-
-    function reloadData() {
-        if (sourceSelector.currentIndex === 0) {
-            // Parsed data from DeviceController
-            loadParsedData();
-        } else {
-            // Live trend from SessionController
-            loadLiveTrend();
-        }
-    }
-
-    function loadParsedData() {
-        statusLabel.text = "Loading...";
-        var result = deviceController.getChartData();
-        if (!result || !result.success) {
-            graph.seriesData = [];
-            graph.sensorNames = [];
-            graph.title = "Sensor Temperature Over Time";
-            statusLabel.text = "No data — read a wafer first";
-            return;
-        }
-
-        graph.seriesData = result.series || [];
-        graph.sensorNames = result.sensor_names || [];
-        graph.title = "Sensor Temperature Over Time";
-        statusLabel.text = (result.series ? result.series.length : 0) + " sensors loaded";
-    }
-
-    function loadLiveTrend() {
-        // Live trend: connects to streamController.trendData
-        // The trend data comes as a JSON array of per-frame averages
-        statusLabel.text = "Connecting to live trend...";
-        // We need at least one data point
-        if (streamController.stats && streamController.stats.avg !== undefined) {
-            // Build a single-series graph from the trend buffer
-            // For now show a placeholder — the trendData signal handles updates
-            graph.title = "Live Average Temperature";
-            graph.yLabel = "Avg Temperature (°C)";
-            graph.xLabel = "Time (s)";
-            statusLabel.text = "Live trend — waiting for data...";
-        } else {
-            statusLabel.text = "No live data — start a stream on the Wafer Map tab";
-        }
-    }
-
-    // ── Connections ─────────────────────────────────────────────────────────────
-
-    Connections {
-        target: deviceController
-        function onParsedDataReady(result) {
-            if (sourceSelector.currentIndex === 0) {
-                root.reloadData();
-            }
-        }
-    }
-
-    Connections {
-        target: streamController
-        function onTrendData(avgsJson) {
-            if (sourceSelector.currentIndex === 1) {
-                try {
-                    var avgs = JSON.parse(avgsJson);
-                    if (avgs && avgs.length > 0) {
-                        graph.seriesData = [avgs];
-                        graph.sensorNames = ["Average"];
-                        graph.title = "Live Average Temperature";
-                        graph.yLabel = "Avg Temperature (°C)";
-                        graph.xLabel = "Frame";
-                        statusLabel.text = "Live: " + avgs.length + " data points";
-                    }
-                } catch (e) {
-                    // ignore parse errors
-                }
-            }
-        }
-    }
-
-    // On startup, try to load parsed data if available
-    Component.onCompleted: {
-        if (deviceController.dataRowCount > 0) {
-            reloadData();
-        }
-    }
-}

src/pygui/ISC/Tabs/WaferMapTab.qml

@@ -205,33 +205,37 @@ Item {
                     font.letterSpacing: 1.2
                 }
             }
+            
+            // Record start/stop toggle (Live mode)
+            Button {
+                visible: streamController.mode === "live"
+                enabled: streamController.state !== "idle" || streamController.recording
+                text: streamController.recording ? "Stop REC" : "Record"
+                onClicked: {
+                    if (streamController.recording) {
+                        streamController.stopRecording();
+                    } else {
+                        var info = deviceController.lastWaferInfo;
+                        var serial = (info && info.length > 1) ? info[1] : "";
+                        var ts = Qt.formatDateTime(new Date(), "yyyyMMdd_HHmmss");
+                        var name = "live_" + (serial ? serial + "_" : "") + ts + ".csv";
+                        streamController.startRecording(deviceController.saveDataDir + "/" + name, serial);
+                    }
+                }
+            }
 
-            // LIVE timer
-            // RowLayout {
-            //     spacing: 5
-            //     visible: streamController.mode === "live" && streamController.state !== "idle"
-            //     Rectangle {
-            //         width: 7; height: 7; radius: 4
-            //         color: Theme.liveColor
-            //     }
-            //     Label {
-            //         text: "LIVE  " + root.fmtTime(root._liveSecs)
-            //         color: Theme.liveColor
-            //         font.pixelSize: Theme.fontXs
-            //         font.weight: Font.Medium
-            //         font.letterSpacing: 0.8
-            //     }
-            // }
+            // Stream statistics popup (Live mode)
+            Button {
+                visible: streamController.mode === "live"
+                text: "Stats"
+                onClicked: streamStatsDialog.open()
+            }
+
+            StreamStatsDialog {
+                id: streamStatsDialog
+                elapsedSecs: root._liveSecs
+            }
 
-            // IDLE label (review / not connected)
-            // Label {
-            //     visible: streamController.mode === "review" || streamController.state === "idle"
-            //     text: streamController.state.toUpperCas`e`()
-            //     color: Theme.bodyColor
-            //     font.pixelSize: Theme.fontXs
-            //     font.weight: Font.Medium
-            //     font.letterSpacing: 1.2
-            // }
             Button {
                 text: "Export PNG"
                 onClicked: exportDialog.open()

src/pygui/ISC/Tabs/components/SourcePanel.qml

@@ -188,9 +188,16 @@ ColumnLayout {
                 return (modelData.baseName + modelData.waferType + modelData.date).toLowerCase().indexOf(q) >= 0;
             }
 
-            // Active only in review mode; no highlight during live streaming
-            readonly property bool isActive: streamController.mode === "review" && streamController.loadedFile !== "" && modelData.fileName === streamController.loadedFile
-
+            // Active highlight logic: on Data tab, highlight compareFileA/B; otherwise highlight loadedFile (for Map tab).
+            readonly property bool isActive:{
+                try {
+                    if (root.selectedTabIndex === 1 && dataTabLoader.item) {
+                        return modelData.fileName === dataTabLoader.item.compareFileA || modelData.fileName === dataTabLoader.item.compareFileB;
+                    }
+                } catch (e) {}
+                return streamController.mode === "review" && streamController.loadedFile !== "" && modelData.fileName === streamController.loadedFile;
+            }
+            
             visible: matchesFilter
             height: matchesFilter ? implicitHeight : 0
 

src/pygui/ISC/Tabs/components/SplitDialog.qml

@@ -0,0 +1,315 @@
+import QtQuick
+import QtQuick.Layouts
+import QtQuick.Controls
+import QtQuick.Dialogs
+import ISC
+
+// ===== Split Dialog (Threshold Segmentation) =====
+// Modal popup for segmenting temperature profile into Ramp/Soak/Cool phases.
+// Backend: splitter.segment_profile() returns list of DataSegment objects.
+
+Popup {
+    id: root
+    modal: true
+    dim: true
+    closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
+    width: Math.min(parent.width - 100, 800)
+    height: Math.min(parent.height - 100, 600)
+    anchors.centerIn: Overlay.overlay
+
+    property real threshold: 40.0
+    property bool segmenting: false
+    property var segments: []
+    property string currentFile: streamController.loadedFile || ""
+
+    background: Rectangle {
+        radius: Theme.radiusMd
+        color: Theme.cardBackground
+        border.color: Theme.cardBorder
+        border.width: 1
+    }
+
+    ColumnLayout {
+        anchors.fill: parent
+        anchors.margins: 20
+        spacing: 16
+
+        // ── Header ────────────────────────────────────────────────
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 10
+
+            Label {
+                text: "SPLIT DATA"
+                font.pixelSize: Theme.fontLg
+                font.bold: true
+                color: Theme.headingColor
+                Layout.fillWidth: true
+            }
+
+            Button {
+                text: "\u2715"
+                flat: true
+                Layout.preferredWidth: 32
+                Layout.preferredHeight: 32
+                onClicked: root.close()
+
+                background: Rectangle {
+                    radius: Theme.radiusXs
+                    color: parent.hovered ? Theme.buttonNeutralHover : "transparent"
+                }
+                contentItem: Label {
+                    text: parent.text
+                    color: Theme.bodyColor
+                    horizontalAlignment: Text.AlignHCenter
+                    verticalAlignment: Text.AlignVCenter
+                }
+            }
+        }
+
+        // ── Threshold Input ───────────────────────────────────────
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 16
+
+            ColumnLayout {
+                Layout.fillWidth: true
+                spacing: 4
+
+                Label {
+                    text: "THRESHOLD TEMPERATURE (°C)"
+                    color: Theme.sideMutedText
+                    font.pixelSize: Theme.fontSm
+                    font.bold: true
+                    font.letterSpacing: 1.0
+                }
+
+                RowLayout {
+                    Layout.fillWidth: true
+                    spacing: 8
+
+                    SpinBox {
+                        id: thresholdSpin
+                        from: 0
+                        to: 200
+                        value: root.threshold
+                        stepSize: 1
+                        editable: true
+                        Layout.fillWidth: true
+                        background: Rectangle {
+                            color: Theme.fieldBackground
+                            border.color: Theme.cardBorder
+                            border.width: 1
+                            radius: Theme.radiusSm
+                        }
+                    }
+
+                    Label {
+                        text: "°C"
+                        color: Theme.bodyColor
+                        font.pixelSize: Theme.fontMd
+                        verticalAlignment: Text.AlignVCenter
+                    }
+                }
+            }
+
+            ColumnLayout {
+                Layout.fillWidth: true
+                spacing: 4
+
+                Label {
+                    text: "SESSION CSV"
+                    color: Theme.sideMutedText
+                    font.pixelSize: Theme.fontSm
+                    font.bold: true
+                    font.letterSpacing: 1.0
+                }
+
+                Label {
+                    Layout.fillWidth: true
+                    text: root.currentFile !== ""
+                        ? root.currentFile.split("/").pop()
+                        : "No file loaded"
+                    color: root.currentFile !== "" ? Theme.bodyColor : Theme.sideMutedText
+                    font.pixelSize: Theme.fontSm
+                    elide: Text.ElideMiddle
+                }
+            }
+        }
+
+        // ── Split Button ──────────────────────────────────────────
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 10
+
+            Button {
+                id: splitBtn
+                text: "SPLIT"
+                Layout.fillWidth: true
+                enabled: !root.segmenting && root.currentFile !== ""
+                onClicked: {
+                    root.threshold = thresholdSpin.value;
+                    root.segmenting = true;
+                    streamController.splitData(root.currentFile, root.threshold);
+                }
+
+                background: Rectangle {
+                    radius: Theme.radiusSm
+                    color: splitBtn.enabled ? Theme.primaryAccent : Theme.buttonNeutralBackground
+                    border.color: splitBtn.enabled ? Theme.primaryAccent : "transparent"
+                    border.width: 1
+                }
+                contentItem: Row {
+                    spacing: 8
+                    anchors.centerIn: parent
+
+                    Label {
+                        text: splitBtn.enabled ? (root.segmenting ? "Segmenting..." : "SPLIT") : "LOAD DATA FIRST"
+                        color: splitBtn.enabled ? Theme.tone100 : Theme.sideMutedText
+                        font.pixelSize: Theme.fontSm
+                        font.bold: true
+                        font.letterSpacing: 1.0
+                    }
+
+                    BusyIndicator {
+                        running: root.segmenting
+                        visible: root.segmenting
+                        width: 16
+                        height: 16
+                    }
+                }
+            }
+        }
+
+        // ── Segments Table ────────────────────────────────────────
+        Rectangle {
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+            radius: Theme.radiusSm
+            color: Theme.panelBackground
+            border.color: Theme.cardBorder
+            border.width: 1
+
+            ColumnLayout {
+                anchors.fill: parent
+                anchors.margins: 0
+                spacing: 0
+
+                // Table header
+                Rectangle {
+                    Layout.fillWidth: true
+                    Layout.preferredHeight: 36
+                    color: Theme.subtleSectionBackground
+                    border.color: Theme.cardBorder
+                    border.width: 1
+
+                    RowLayout {
+                        anchors.fill: parent
+                        anchors.margins: 12
+                        spacing: 8
+
+                        Label { text: "PHASE"; Layout.preferredWidth: 100; color: Theme.sideMutedText; font.bold: true; font.pixelSize: Theme.fontSm }
+                        Label { text: "START (s)"; Layout.preferredWidth: 120; color: Theme.sideMutedText; font.bold: true; font.pixelSize: Theme.fontSm }
+                        Label { text: "END (s)"; Layout.preferredWidth: 120; color: Theme.sideMutedText; font.bold: true; font.pixelSize: Theme.fontSm }
+                        Label { text: "AVG TEMP (°C)"; Layout.fillWidth: true; color: Theme.sideMutedText; font.bold: true; font.pixelSize: Theme.fontSm }
+                    }
+                }
+
+                // Table body (scrollable)
+                ScrollView {
+                    Layout.fillWidth: true
+                    Layout.fillHeight: true
+                    clip: true
+
+                    ColumnLayout {
+                        width: parent.width - 32
+                        spacing: 0
+
+                        Repeater {
+                            model: root.segments.length > 0 ? root.segments : []
+                            delegate: Rectangle {
+                                Layout.fillWidth: true
+                                Layout.preferredHeight: 40
+                                color: index % 2 === 0 ? Theme.cardBackground : "transparent"
+                                border.color: Theme.cardBorder
+
+                                RowLayout {
+                                    anchors.fill: parent
+                                    anchors.margins: 12
+                                    spacing: 8
+
+                                    Label {
+                                        text: modelData.label || ""
+                                        Layout.preferredWidth: 100
+                                        color: modelData.label === "Soak" ? Theme.statusSuccessColor :
+                                               modelData.label === "Ramp" ? Theme.statusWarningColor : Theme.bodyColor
+                                        font.bold: true
+                                        font.pixelSize: Theme.fontSm
+                                    }
+
+                                    Label {
+                                        text: (modelData.start_frame || 0).toString()
+                                        Layout.preferredWidth: 120
+                                        color: Theme.bodyColor
+                                        font.pixelSize: Theme.fontSm
+                                    }
+
+                                    Label {
+                                        text: (modelData.end_frame || 0).toString()
+                                        Layout.preferredWidth: 120
+                                        color: Theme.bodyColor
+                                        font.pixelSize: Theme.fontSm
+                                    }
+
+                                    Label {
+                                        text: (modelData.avg_temp || 0).toFixed(2) + " °C"
+                                        Layout.fillWidth: true
+                                        color: Theme.bodyColor
+                                        font.pixelSize: Theme.fontSm
+                                    }
+                                }
+                            }
+                        }
+
+                        // Empty state
+                        Label {
+                            visible: root.segments.length === 0
+                            text: root.currentFile !== "" ? "Click SPLIT to segment data" : "Load a CSV file first"
+                            color: Theme.sideMutedText
+                            font.pixelSize: Theme.fontSm
+                            Layout.fillWidth: true
+                            Layout.preferredHeight: 100
+                            horizontalAlignment: Text.AlignHCenter
+                            verticalAlignment: Text.AlignVCenter
+                        }
+                    }
+                }
+            }
+        }
+
+        // ── Summary line ──────────────────────────────────────────
+        Label {
+            visible: root.segments.length > 0
+            text: root.segments.length + " segment" + (root.segments.length === 1 ? "" : "s")
+                + " found above " + root.threshold.toFixed(0) + "°C threshold."
+            color: Theme.bodyColor
+            font.pixelSize: Theme.fontSm
+        }
+    }
+
+    // ── Backend Connection ────────────────────────────────────────
+    Connections {
+        target: streamController
+        function onSplitResult(result) {
+            root.segmenting = false;
+            if (result && result.success) {
+                root.segments = result.segments || [];
+                console.log("[SplitDialog] Segmented into", root.segments.length, "phases");
+            } else {
+                root.segments = [];
+                console.log("[SplitDialog] Split failed:", result.error || "unknown");
+            }
+        }
+    }
+
+}

src/pygui/ISC/Tabs/components/StreamStatsDialog.qml

@@ -0,0 +1,128 @@
+import QtQuick
+import QtQuick.Layouts
+import QtQuick.Controls
+import ISC
+
+// ===== Stream Stats Dialog =====
+// Popup showing live stream statistics: received frames, errors,
+// resync count, and elapsed time. Opened from the Live toolbar.
+
+Popup {
+    id: root
+    modal: true
+    dim: true
+    closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
+    width: 320
+    implicitHeight: content.implicitHeight + 40
+    anchors.centerIn: Overlay.overlay
+
+    // Elapsed seconds supplied by the Live timer in WaferMapTab.
+    property int elapsedSecs: 0
+
+    function fmtTime(s) {
+        var m = Math.floor(s / 60);
+        var ss = s % 60;
+        return (m < 10 ? "0" : "") + m + ":" + (ss < 10 ? "0" : "") + ss;
+    }
+
+    background: Rectangle {
+        radius: Theme.radiusMd
+        color: Theme.cardBackground
+        border.color: Theme.cardBorder
+        border.width: 1
+    }
+
+    component StatRow: RowLayout {
+        property string label
+        property string value
+        Layout.fillWidth: true
+        spacing: 8
+
+        Label {
+            text: label
+            color: Theme.bodyColor
+            font.pixelSize: Theme.fontXs
+            Layout.fillWidth: true
+        }
+        Label {
+            text: value
+            color: Theme.headingColor
+            font.pixelSize: Theme.fontSm
+            font.weight: Font.Medium
+        }
+    }
+
+    ColumnLayout {
+        id: content
+        anchors.fill: parent
+        anchors.margins: 20
+        spacing: 16
+
+        // ── Header ────────────────────────────────────────────────
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 10
+
+            Label {
+                text: "STREAM DATA"
+                font.pixelSize: Theme.fontLg
+                font.bold: true
+                color: Theme.headingColor
+                Layout.fillWidth: true
+            }
+
+            Button {
+                text: "✕"
+                flat: true
+                Layout.preferredWidth: 32
+                Layout.preferredHeight: 32
+                onClicked: root.close()
+
+                background: Rectangle {
+                    radius: Theme.radiusXs
+                    color: parent.hovered ? Theme.buttonNeutralHover : "transparent"
+                }
+                contentItem: Label {
+                    text: parent.text
+                    color: Theme.bodyColor
+                    horizontalAlignment: Text.AlignHCenter
+                    verticalAlignment: Text.AlignVCenter
+                }
+            }
+        }
+
+        // ── Stats box ─────────────────────────────────────────────
+        Rectangle {
+            Layout.fillWidth: true
+            implicitHeight: statRows.implicitHeight + 20
+            radius: Theme.radiusSm
+            color: Theme.subtleSectionBackground
+            border.color: Theme.cardBorder
+            border.width: 1
+
+            ColumnLayout {
+                id: statRows
+                anchors.fill: parent
+                anchors.margins: 10
+                spacing: 8
+
+                StatRow {
+                    label: "Received frames"
+                    value: streamController.receivedCount
+                }
+                StatRow {
+                    label: "Errors"
+                    value: streamController.errorCount
+                }
+                StatRow {
+                    label: "Resyncs"
+                    value: streamController.resyncCount
+                }
+                StatRow {
+                    label: "Elapsed"
+                    value: root.fmtTime(root.elapsedSecs)
+                }
+            }
+        }
+    }
+}

src/pygui/ISC/Tabs/components/qmldir

@@ -6,3 +6,5 @@ TransportBar 1.0 TransportBar.qml
 WaferMapView 1.0 WaferMapView.qml
 ReplaceSensorDialog 1.0 ReplaceSensorDialog.qml
 RailActionButton 1.0 RailActionButton.qml
+SplitDialog 1.0 SplitDialog.qml
+StreamStatsDialog 1.0 StreamStatsDialog.qml

src/pygui/ISC/Tabs/qmldir

@@ -1,7 +1,6 @@
 # ===== ISC Tabs Module =====
 module ISC.Tabs
 
-GraphTab 1.0 GraphTab.qml
 WaferMapTab 1.0 WaferMapTab.qml
 DataTab 1.0 DataTab.qml
 SettingsTab 1.0 SettingsTab.qml

src/pygui/ISC/Theme.qml

@@ -44,9 +44,6 @@ QtObject {
     readonly property int fontWeightMedium: 500
     readonly property int fontWeightBold: 700
 
-    // Legacy shim
-    readonly property int tabFontSize: fontSm
-
     // ── 3. Motion ──────────────────────────────────────────────────────────
     readonly property int durationFast: 120   // micro-interactions (focus ring, hover flash)
     readonly property int durationBase: 180   // standard transitions (pill switch, row select)
@@ -118,14 +115,8 @@ QtObject {
     // ── 7. Tracks (pill toggle, scrollbar thumb) ─────────────────────────────
     readonly property color trackBackground: isDarkMode ? "#25252B" : "#E2E2DE"
 
-    // ── 8. Tabs (footer tab bar) ─────────────────────────────────────────────
-    readonly property color tabBarBackground: tone200
-    readonly property color tabBackground: "transparent"
+    // ── 8. Tabs (mode toggle pills) ──────────────────────────────────────────
     readonly property color tabActiveBackground: isDarkMode ? "#25252B" : "#FFFFFF"
-    readonly property color tabHoverBackground: tone250
-    readonly property color tabBorder: "transparent"
-    readonly property color tabText: toneMute
-    readonly property color tabActiveText: toneText
 
     // ── 9. Side rail ─────────────────────────────────────────────────────────
     readonly property color sideRailBackground: tone150
@@ -133,12 +124,8 @@ QtObject {
     readonly property color sideActiveBackground: isDarkMode ? "#25252B" : "#FFFFFF"
     readonly property color sideBorder: toneBorder
     readonly property color sideMutedText: toneMute
-    readonly property color sideAccent: themeAccent
-    readonly property color sideRowHover: tone250
-    readonly property color sideFieldBackground: isDarkMode ? "#101014" : "#FFFFFF"
 
     // ── 10a. Transport / toolbar surfaces ────────────────────────────────────
-    readonly property color transportBackground: isDarkMode ? "#101014" : "#EFEFED"
     readonly property color transportButtonBg: tone250
     readonly property color transportButtonHover: tone300
     readonly property color liveColor: themeAdded
@@ -179,14 +166,7 @@ QtObject {
     readonly property int sidePanelRadius: 10
     readonly property int sideFooterConnection: 100
     readonly property int sideFooterUtility: 46
-    // Tab bar layout
-    readonly property int tabBarHeight: 34
     readonly property int sidePillHeight: 54
-    readonly property int sidePillButtonHeight: 36
-    readonly property int tabBarPadding: 6
-    readonly property int tabSpacing: 2
-    readonly property int tabRadius: 8
-    readonly property int tabButtonMinWidth: 80
     // Settings page layout
     readonly property int settingsPanelMaxWidth: 760
     readonly property int settingsOuterMargin: 40

src/pygui/backend/controllers/device_controller.py

@@ -3,8 +3,12 @@
 from __future__ import annotations
 
 import logging
+import os
+import subprocess
+import sys
 import threading
 from datetime import datetime
+from pathlib import Path
 from typing import Any, Optional
 
 from PySide6.QtCore import Property, QObject, Qt, Signal, Slot
@@ -20,7 +24,6 @@ from pygui.serialcomm.data_parser import (
     remove_trailing_zeros,
     save_to_csv,
 )
-from pygui.serialcomm.device_service import DeviceService
 from pygui.serialcomm.serial_port import WaferInfo
 
 # import pygui.backend.wafer_map_item
@@ -61,6 +64,7 @@ class DeviceController(QObject):
         super().__init__(parent)
         self._settings = settings
         self._data_dir = data_dir
+        from pygui.serialcomm.device_service import DeviceService
         self._service = DeviceService(settings)
 
         # Always start fresh — never restore connection status or logs from a prior session
@@ -68,7 +72,6 @@ class DeviceController(QObject):
         self._operation_in_progress = False
         self._activity_log: list[str] = []
         self._raw_bytes: Optional[bytes] = None
-        from pathlib import Path
         self._save_data_dir: str = getattr(settings, 'save_data_dir', "") or str(Path(self._data_dir) / "csv")
         self._last_wafer_info: dict[str, Any] = {}
         self._last_csv_path: str = ""
@@ -126,6 +129,34 @@ class DeviceController(QObject):
         self._append_log(f"Save data dir set to: {path}")
         self._save_status()
 
+    @Slot(str)
+    @slot_error_boundary
+    def openCsvFile(self, file_path: str) -> None:
+        """Open a CSV file in the system default spreadsheet application."""
+
+        if not file_path:
+            self._append_log("No file path provided to openCsvFile")
+            return
+
+        try:
+            path = Path(file_path)
+            if not path.exists():
+                self._append_log(f"File not found: {file_path}")
+                return
+
+            # Platform-appropriate file opener
+            if sys.platform == "darwin":
+                subprocess.Popen(["open", str(path)])
+            elif sys.platform == "linux":
+                subprocess.Popen(["xdg-open", str(path)])
+            else:  # Windows
+                os.startfile(str(path))
+
+            self._append_log(f"Opened file: {file_path}")
+        except Exception as exc:
+            log.warning("Failed to open file %s: %s", file_path, exc)
+            self._append_log(f"Error opening file: {exc}")
+
     @Property(str, notify=selectedPortChanged)
     def selectedPort(self) -> str:
         """Currently selected serial port shared across the UI."""
@@ -517,7 +548,6 @@ class DeviceController(QObject):
             return
 
         if not self._save_data_dir:
-            from pathlib import Path
             self._save_data_dir = str(Path(self._data_dir) / "csv")
             self._append_log(f"Auto-set save directory to: {self._save_data_dir}")
             self._save_status()

src/pygui/backend/controllers/session_controller.py

@@ -40,6 +40,10 @@ class SessionController(QObject):
     liveStatsChanged = Signal()  # emitted when receivedCount or errorCount change
     # trend: per-frame avg for live graph
     trendData = Signal(str)  # JSON array of floats
+    # NOTE: dict (QVariantMap), not object — Signal(object) delivers Python
+    # dicts to QML as an opaque empty wrapper with no accessible fields.
+    comparisonResult = Signal(dict)  # dict with success, distance, warping_path, max_sensor_deviation, series_a, series_b
+    splitResult = Signal(dict)  # dict with success, segments
     # private: marshal a worker-thread frame onto the main thread
     _liveFrame = Signal(object)    # Frame
     _liveError = Signal()          # worker-thread error ping
@@ -226,6 +230,10 @@ class SessionController(QObject):
     def errorCount(self) -> int:
         return self._error_count
 
+    @Property(int, notify=liveStatsChanged)
+    def resyncCount(self) -> int:
+        return self._reader.resync_count if self._reader else 0
+
     # ---- mode + thresholds ----
     @Slot(str)
     @slot_error_boundary
@@ -305,6 +313,176 @@ class SessionController(QObject):
         self.trendData.emit(json.dumps(self._stats_tracker.get_trend()))
         self.settingsChanged.emit()
 
+    @Slot()
+    @slot_error_boundary
+    def unloadFile(self) -> None:
+        """Clear the loaded file, resetting the player and frame states."""
+        self._player.load([])
+        self._model.reset()
+        self._stats_tracker.reset()
+        self._loaded_file = ""
+        self.loadedFileChanged.emit()
+        self.sensorsChanged.emit()
+        self.settingsChanged.emit()
+
+    # ---- comparison: DTW between two CSV files ----
+    @Slot(str, str)
+    @slot_error_boundary
+    def compareFiles(self, file_a: str, file_b: str) -> None:
+        """Run DTW comparison between two CSV files and emit result."""
+        from pygui.backend.comparison import compare_runs
+        from pygui.backend.data.data_records import is_official_csv, read_data_records, read_official_csv
+
+        try:
+            if is_official_csv(file_a):
+                _, recs_a = read_official_csv(file_a)
+            else:
+                recs_a = read_data_records(file_a)
+
+            if is_official_csv(file_b):
+                _, recs_b = read_official_csv(file_b)
+            else:
+                recs_b = read_data_records(file_b)
+            if not recs_a or not recs_b:
+                self.comparisonResult.emit({
+                    "success": False,
+                    "error": "No data in one or both files"
+                })
+                return
+
+            # Use first 100 frames of each for comparison (avoid O(n²) blowup)
+            max_frames = min(100, len(recs_a), len(recs_b))
+            series_a = [recs_a[i].values[0] if recs_a[i].values else 0.0
+                       for i in range(max_frames)]
+            series_b = [recs_b[i].values[0] if recs_b[i].values else 0.0
+                       for i in range(max_frames)]
+
+            result = compare_runs(series_a, series_b)
+
+            # Mean temporal shift along the DTW path: positive means run B
+            # reaches the same profile features later than run A.
+            path = result["warping_path"]
+            frame_offset = round(sum(j - i for i, j in path) / len(path)) if path else 0
+
+            # Max sensor deviation: walk the DTW-aligned frame pairs and take
+            # the largest per-sensor abs difference across all sensors, not
+            # just the sensor[0] series used for alignment.
+            num_sensors = min(len(recs_a[0].values), len(recs_b[0].values)) if recs_a[0].values and recs_b[0].values else 0
+            max_sensor_deviation = 0.0
+            for i, j in zip(result["index_a"], result["index_b"]):
+                if i >= max_frames or j >= max_frames:
+                    continue
+                values_a = recs_a[i].values
+                values_b = recs_b[j].values
+                for s in range(min(num_sensors, len(values_a), len(values_b))):
+                    diff = abs(values_a[s] - values_b[s])
+                    if diff > max_sensor_deviation:
+                        max_sensor_deviation = diff
+
+            # Sensor layout + per-sensor diff for the wafer overlap view. Reuses the
+            # same sensor-parsing branch as loadFile() (file_a is assumed representative
+            # of both files' wafer type).
+            from pathlib import Path
+
+            from pygui.backend.data.data_records import is_official_csv, read_official_csv
+            from pygui.backend.wafer.wafer_layouts import resolve_shape_and_size
+            from pygui.backend.wafer.zwafer_parser import ZWaferParser
+
+            sensor_layout: list[dict] = []
+            sensor_diff: list[float] = []
+            wafer_shape = "round"
+            wafer_size = 300.0
+            try:
+                if is_official_csv(file_a):
+                    sensors, _ = read_official_csv(file_a)
+                    stem = Path(file_a).stem
+                    wafer_id = stem.split("-")[0] if "-" in stem else stem
+                else:
+                    parsed, _ = ZWaferParser().parse(file_a)
+                    sensors = parsed.sensors if parsed else []
+                    wafer_id = parsed.serial if (parsed and parsed.serial) else ""
+
+                if sensors:
+                    wafer_shape, wafer_size = resolve_shape_and_size(sensors, wafer_id)
+                    last_a = recs_a[max_frames - 1].values
+                    last_b = recs_b[max_frames - 1].values
+                    n = min(len(sensors), len(last_a), len(last_b))
+                    sensor_layout = [
+                        {
+                            "label": s.label,
+                            "x": s.x,
+                            "y": s.y,
+                            "side": getattr(s, "side", "right"),
+                            "offset_x": getattr(s, "offset_x", 0.0),
+                            "offset_y": getattr(s, "offset_y", 0.0),
+                        }
+                        for s in sensors[:n]
+                    ]
+                    sensor_diff = [round(last_b[i] - last_a[i], 3) for i in range(n)]
+            except Exception as layout_exc:
+                log.warning("Could not resolve sensor layout for overlap view: %s", layout_exc)
+
+            self.comparisonResult.emit({
+                "success": True,
+                "distance": result["distance"],
+                # Lists, not tuples — tuples don't survive QVariant conversion
+                "warping_path": [list(p) for p in result["warping_path"][:50]],
+                "frame_offset": frame_offset,
+                "max_sensor_deviation": max_sensor_deviation,
+                "series_a": series_a,
+                "series_b": series_b,
+                "sensor_layout": sensor_layout,
+                "sensor_diff": sensor_diff,
+                "wafer_shape": wafer_shape,
+                "wafer_size": wafer_size,
+            })
+        except Exception as exc:
+            log.warning("Comparison failed: %s", exc)
+            self.comparisonResult.emit({
+                "success": False,
+                "error": str(exc)
+            })
+
+    # ---- splitting: threshold-based segmentation ----
+    @Slot(str, float)
+    @slot_error_boundary
+    def splitData(self, file_path: str, threshold: float) -> None:
+        """Segment temperature profile into Ramp/Soak/Cool phases."""
+        from pygui.backend.data.data_records import is_official_csv, read_data_records, read_official_csv
+        from pygui.backend.splitter import segment_profile
+
+        try:
+            if is_official_csv(file_path):
+                _, records = read_official_csv(file_path)
+            else:
+                records = read_data_records(file_path)
+            if not records:
+                self.splitResult.emit({
+                    "success": False,
+                    "error": "No data in file"
+                })
+                return
+
+            # Extract average temperatures (use first sensor as proxy)
+            avg_temps = [rec.values[0] if rec.values else 0.0 for rec in records]
+            segments = segment_profile(avg_temps, threshold)
+
+            self.splitResult.emit({
+                "success": True,
+                "segments": [{
+                    "label": seg.label,
+                    "start_frame": seg.start_frame,
+                    "end_frame": seg.end_frame,
+                    "avg_temp": seg.avg_temp
+                } for seg in segments]
+            })
+        except Exception as exc:
+            log.warning("Split failed: %s", exc)
+            self.splitResult.emit({
+                "success": False,
+                "error": str(exc)
+            })
+
     @Slot()
     @slot_error_boundary
     def play(self) -> None:
@@ -594,6 +772,4 @@ class SessionController(QObject):
 
     def _flush_trend(self) -> None:
         import json
-        self.trendData.emit(json.dumps(self._trend_buffer))
-
-
+        self.trendData.emit(json.dumps(self._trend_buffer))

src/pygui/backend/wafer/__init__.py

@@ -1,4 +1,5 @@
 # ===== Wafer Sub-package =====
+from pygui.backend.wafer.family_spec import sensor_count_for
 from pygui.backend.wafer.wafer_layouts import available_families, load_layout
 from pygui.backend.wafer.zwafer_models import DataRecord, Sensor, ZWaferData
 from pygui.backend.wafer.zwafer_parser import ZWaferParser
@@ -7,4 +8,5 @@ __all__ = [
     "ZWaferData", "Sensor", "DataRecord",
     "ZWaferParser",
     "load_layout", "available_families",
+    "sensor_count_for",
 ]

src/pygui/backend/wafer/family_spec.py

@@ -0,0 +1,9 @@
+"""Single source of truth for the wafer sensor-count partition."""
+
+
+def sensor_count_for(family_code: str) -> int:
+    """Return the number of valid sensor readings for a wafer family code.
+
+    Returns 80 for the "X" family. Returns 244 for every other family
+    code."""
+    return 80 if family_code == "X" else 244

src/pygui/serialcomm/data_parser.py

@@ -12,13 +12,9 @@ import logging
 import os
 from typing import Optional
 
-log = logging.getLogger(__name__)
+from pygui.backend.wafer.family_spec import sensor_count_for
 
-# Max DUTs (sensors) per row before overhead bytes are stripped
-# P wafer: 244 valid readings per 256-block (12 overhead bytes)
-# X wafer: 80 valid readings per 256-block (14 overhead bytes)
-MAXDUT_P = 244
-MAXDUT_X = 80
+log = logging.getLogger(__name__)
 
 
 def csv_column_count(family_code: str) -> int:
@@ -156,26 +152,27 @@ def _parse_p_binary(data_bytes: bytes) -> list[list[str]]:
     """Parse P-family (and A/B/C/D/E/F) binary data.
 
     Each block of 256 readings has 244 valid + 12 overhead.
-    Valid readings are chunked into rows of MAXDUT_P (244).
+    Valid readings are chunked into rows of the family's sensor count (244).
     """
+    sensor_count = sensor_count_for("P")
     readings: list[str] = []
 
     # Read 2 bytes at a time (UInt16 little-endian)
-    # Each 256-word block has MAXDUT_P valid readings (first N words), rest are overhead
+    # Each 256-word block has `sensor_count` valid readings (first N words), rest are overhead
     num_words = len(data_bytes) // 2
     for i in range(num_words):
         value = int.from_bytes(data_bytes[i * 2 : i * 2 + 2], byteorder="little")
-        if i % 256 < MAXDUT_P:
+        if i % 256 < sensor_count:
             readings.append(f"{value:04X}")
 
-    # Chunk into rows of MAXDUT_P
+    # Chunk into rows of sensor_count
     result: list[list[str]] = []
     idx = 0
-    while idx + MAXDUT_P <= len(readings):
-        result.append(readings[idx : idx + MAXDUT_P])
-        idx += MAXDUT_P
+    while idx + sensor_count <= len(readings):
+        result.append(readings[idx : idx + sensor_count])
+        idx += sensor_count
 
-    log.info("Parsed P-family: %d rows × %d cols", len(result), MAXDUT_P)
+    log.info("Parsed P-family: %d rows × %d cols", len(result), sensor_count)
     return result
 
 
@@ -183,24 +180,25 @@ def _parse_x_binary(data_bytes: bytes) -> list[list[str]]:
     """Parse X-family binary data.
 
     Each block of 256 readings has 80 valid + 14 overhead.
-    Valid readings are chunked into rows of MAXDUT_X (80).
+    Valid readings are chunked into rows of the family's sensor count (80).
     """
+    sensor_count = sensor_count_for("X")
     readings: list[str] = []
 
     num_words = len(data_bytes) // 2
     for i in range(num_words):
         value = int.from_bytes(data_bytes[i * 2 : i * 2 + 2], byteorder="little")
-        if i % 256 < MAXDUT_X:
+        if i % 256 < sensor_count:
             readings.append(f"{value:04X}")
 
-    # Chunk into rows of MAXDUT_X
+    # Chunk into rows of sensor_count
     result: list[list[str]] = []
     idx = 0
-    while idx + MAXDUT_X <= len(readings):
-        result.append(readings[idx : idx + MAXDUT_X])
-        idx += MAXDUT_X
+    while idx + sensor_count <= len(readings):
+        result.append(readings[idx : idx + sensor_count])
+        idx += sensor_count
 
-    log.info("Parsed X-family: %d rows × %d cols", len(result), MAXDUT_X)
+    log.info("Parsed X-family: %d rows × %d cols", len(result), sensor_count)
     return result
 
 

src/pygui/serialcomm/device_service.py

@@ -19,14 +19,6 @@ log = logging.getLogger(__name__)
 class DeviceService:
     """High-level wafer device communication."""
 
-    # Expected hex string lengths for known wafer families
-    # P wafer: 393216 hex chars (196608 bytes)
-    # X wafer: 1310720 hex chars (655360 bytes)
-    EXPECTED_HEX_LENGTHS = {
-        "P": 393216,
-        "X": 1310720,
-    }
-
     def __init__(self, settings: LocalSettings) -> None:
         self._settings = settings
         self._cached_ports: list[str] = []
@@ -209,7 +201,3 @@ class DeviceService:
         except Exception as exc:
             log.error("Erase failed on %s: %s", port, exc)
             return False
-
-    def get_expected_hex_length(self, family_code: str) -> int:
-        """Return expected hex string length for a wafer family."""
-        return self._settings.get_wafer_data_size(family_code)

src/pygui/serialcomm/stream_reader.py

@@ -7,6 +7,7 @@ import time
 from typing import Callable
 
 from pygui.backend.models.frame import Frame
+from pygui.backend.wafer.family_spec import sensor_count_for
 from pygui.serialcomm.data_parser import _convert_hex_to_temp
 
 log = logging.getLogger(__name__)
@@ -30,6 +31,8 @@ class StreamReader:
         self._thread: threading.Thread | None = None
         self._stop = threading.Event()
         self.error_count = 0
+        # Cumulative count of resync events (lost sync marker) for stream stats.
+        self.resync_count = 0
 
     def start(self) -> None:
         self._stop.clear()
@@ -158,6 +161,7 @@ class StreamReader:
             else:
                 # Resync: keep only trailing 0xAA if present, then read more.
                 resync_attempts += 1
+                self.resync_count += 1
                 if resync_attempts > _MAX_RESYNC_ATTEMPTS:
                     log.error(
                         "StreamReader: giving up after %d resync attempts "
@@ -179,7 +183,7 @@ class StreamReader:
     def _run_ascii(self, initial_bytes: bytes) -> None:
         log.info("StreamReader: starting ASCII hex dump stream parsing")
 
-        valid_words = 80 if self._family_code == "X" else 244
+        valid_words = sensor_count_for(self._family_code)
         block_words = 256
         word_char_len = 4
         chars_needed = block_words * word_char_len  # total hex chars per block

tests/test_data_parser.py

@@ -8,8 +8,6 @@ from pygui.serialcomm.data_parser import (
     remove_trailing_zeros,
     save_to_csv,
     _convert_hex_to_temp,
-    MAXDUT_P,
-    MAXDUT_X,
 )
 
 # ── csv_column_count ──────────────────────────────────────────────────────────
@@ -106,7 +104,7 @@ def _make_p_block(num_blocks: int = 1, value: int = 0x0100) -> bytes:
     data = bytearray()
     for _ in range(num_blocks):
         for i in range(256):
-            word = value if i < MAXDUT_P else 0
+            word = value if i < 244 else 0
             data += word.to_bytes(2, byteorder="little")
     return bytes(data)
 
@@ -120,7 +118,7 @@ def _make_x_block(num_blocks: int = 1, value: int = 0x0100) -> bytes:
     data = bytearray()
     for _ in range(num_blocks):
         for i in range(256):
-            word = value if i < MAXDUT_X else 0
+            word = value if i < 80 else 0
             data += word.to_bytes(2, byteorder="little")
     return bytes(data)
 
@@ -136,7 +134,7 @@ class TestParseBinaryData:
         data = _make_p_block(1)
         result = parse_binary_data(data, "P")
         assert result is not None
-        assert len(result[0]) == MAXDUT_P  # 244
+        assert len(result[0]) == 244
 
     def test_p_family_two_blocks_returns_two_rows(self):
         data = _make_p_block(2)
@@ -161,14 +159,14 @@ class TestParseBinaryData:
         data = _make_x_block(1)
         result = parse_binary_data(data, "X")
         assert result is not None
-        assert len(result[0]) == MAXDUT_X  # 80
+        assert len(result[0]) == 80
 
     def test_a_family_uses_p_parser(self):
         # A/B/C/D/E/F all route to _parse_p_binary
         data = _make_p_block(1)
         result = parse_binary_data(data, "A")
         assert result is not None
-        assert len(result[0]) == MAXDUT_P
+        assert len(result[0]) == 244
 
     def test_empty_bytes_returns_empty_list(self):
         result = parse_binary_data(b"", "P")

tests/test_family_spec.py

@@ -0,0 +1,23 @@
+"""Tests for the shared wafer family sensor-count lookup."""
+from pygui.backend.wafer.family_spec import sensor_count_for
+
+
+def test_x_family_returns_80():
+    assert sensor_count_for("X") == 80
+
+
+def test_p_family_returns_244():
+    assert sensor_count_for("P") == 244
+
+
+def test_other_known_families_return_244():
+    for code in ("A", "B", "C", "D", "E", "F"):
+        assert sensor_count_for(code) == 244
+
+
+def test_unknown_family_returns_244():
+    assert sensor_count_for("Z") == 244
+
+
+def test_empty_string_returns_244():
+    assert sensor_count_for("") == 244

tests/test_session_controller.py

@@ -46,3 +46,90 @@ def test_pause_stop_timer(controller):
     controller.seek(2)
     controller.stop()
     assert controller.frameIndex == 0
+
+def test_compare_files_integration(controller):
+    # Mock the comparisonResult signal
+    mock_slot = MagicMock()
+    controller.comparisonResult.connect(mock_slot)
+
+    # Use sample_stream.csv for both arguments to test identical files compare
+    csv_path = "tests/fixtures/sample_stream.csv"
+    controller.compareFiles(csv_path, csv_path)
+
+    # Verify that the comparison signal is emitted with a success dict
+    assert mock_slot.call_count == 1
+    args = mock_slot.call_args[0][0]
+    assert args["success"] is True
+    assert "distance" in args
+    assert "series_a" in args
+    assert "series_b" in args
+    assert args["frame_offset"] == 0
+
+def test_comparison_result_reaches_qml(qapp, controller):
+    """The result dict must arrive in QML as a real JS object with fields.
+
+    Signal(object) delivers Python dicts to QML as an opaque empty wrapper;
+    the signal must be declared with a dict/QVariantMap signature.
+    """
+    from PySide6.QtQml import QQmlApplicationEngine
+
+    engine = QQmlApplicationEngine()
+    engine.rootContext().setContextProperty("streamController", controller)
+    engine.loadData(b"""
+import QtQuick
+Item {
+    id: probe
+    property bool gotSuccess: false
+    property real gotDistance: -1
+    Connections {
+        target: streamController
+        function onComparisonResult(result) {
+            probe.gotSuccess = result.success === true
+            probe.gotDistance = result.distance !== undefined ? result.distance : -1
+        }
+    }
+}
+""")
+    assert engine.rootObjects(), "probe QML failed to load"
+    root = engine.rootObjects()[0]
+
+    csv_path = "tests/fixtures/sample_stream.csv"
+    controller.compareFiles(csv_path, csv_path)
+    qapp.processEvents()
+
+    assert root.property("gotSuccess") is True
+    assert root.property("gotDistance") >= 0
+
+def test_recording_toggle(controller, tmp_path):
+    csv_path = str(tmp_path / "rec" / "live_test.csv")
+    controller.startRecording(csv_path, "SN123")
+    assert controller.recording == True
+
+    controller.stopRecording()
+    assert controller.recording == False
+
+    # Header written with wafer serial
+    content = open(csv_path).read()
+    assert "Wafer ID=SN123" in content
+
+def test_resync_count_default(controller):
+    # No active reader -> zero
+    assert controller.resyncCount == 0
+
+    controller._reader = MagicMock(resync_count=7)
+    assert controller.resyncCount == 7
+    controller._reader = None
+
+def test_split_data_integration(controller):
+    # Mock the splitResult signal
+    mock_slot = MagicMock()
+    controller.splitResult.connect(mock_slot)
+
+    csv_path = "tests/fixtures/sample_stream.csv"
+    controller.splitData(csv_path, 149.0)
+
+    # Verify that the split signal is emitted
+    assert mock_slot.call_count == 1
+    args = mock_slot.call_args[0][0]
+    assert args["success"] is True
+    assert "segments" in args