fix: address audit findings for Phase 1 scan

- Extract _cleanup() to properly unregister ADC listener + clear timers
- ADC callback unregisters itself on first receive (prevent duplicates)
- setParams failure now stops scanning and clears all state
- Timeout handler unregisters ADC listener
- Add BLE connection check before scan
- SCAN_TIMEOUT 8s → 12s (must exceed hold_time 10s)
- Pre-compute barWidth in JS instead of float math in WXML
- Error only shows when scanning is false

miniprogram/pages/auto-scan/auto-scan.js

@@ -1,6 +1,6 @@
 var ble = require('../../services/ble')
 var SCAN_BRIGHTNESS = 128
-var SCAN_TIMEOUT = 8000
+var SCAN_TIMEOUT = 12000
 
 Page({
   data: {
@@ -32,8 +32,20 @@ Page({
     this.startScan()
   },
 
+  _cleanup: function () {
+    if (this._progressTimer) { clearInterval(this._progressTimer); this._progressTimer = null }
+    if (this._timeoutTimer) { clearTimeout(this._timeoutTimer); this._timeoutTimer = null }
+    if (this._onAdc) { ble.off('adc', this._onAdc); this._onAdc = null }
+  },
+
   startScan: function () {
     var self = this
+
+    if (!ble.isConnected()) {
+      self.setData({ scanning: false, error: '设备未连接，请先连接设备' })
+      return
+    }
+
     self.setData({ scanning: true, scanProgress: 0, error: '', pdValues: [] })
 
     this._progressTimer = setInterval(function () {
@@ -44,8 +56,7 @@ Page({
 
     this._onAdc = function (data) {
       console.log('[SCAN] 收到ADC数据:', JSON.stringify(data))
-      clearInterval(self._progressTimer)
-      clearTimeout(self._timeoutTimer)
+      self._cleanup()
       self.setData({ scanning: false, scanProgress: 100 })
       self._handleAdcData(data)
     }
@@ -61,13 +72,14 @@ Page({
       console.log('[SCAN] 扫描指令发送成功，等待ADC回传...')
     }).catch(function (err) {
       console.error('[SCAN] 扫描指令发送失败:', err)
-      self.setData({ error: '扫描指令发送失败' })
+      self._cleanup()
+      self.setData({ scanning: false, scanProgress: 0, error: '扫描指令发送失败' })
     })
 
     this._timeoutTimer = setTimeout(function () {
-      clearInterval(self._progressTimer)
       if (!self.data.scanning) return
       console.log('[SCAN] 等待ADC超时，使用默认值')
+      self._cleanup()
       self.setData({ scanning: false, scanProgress: 100 })
       self._handleAdcData(null)
     }, SCAN_TIMEOUT)
@@ -80,16 +92,17 @@ Page({
     if (data && data.pd && data.pd.length >= 7) {
       this.setData({ pdRaw: data.pd, vbat: data.vbat || 0, battery: data.battery || 0 })
       for (var i = 0; i < 5; i++) {
-        pdValues.push({ region: regionNames[i], pd: data.pd[i], pdText: String(data.pd[i]) })
+        var barW = Math.min(100, Math.round(data.pd[i] / 40.95))
+        pdValues.push({ region: regionNames[i], pd: data.pd[i], pdText: String(data.pd[i]), barWidth: barW })
       }
-      pdValues.push({ region: 'PD6', pd: data.pd[5], pdText: String(data.pd[5]) })
-      pdValues.push({ region: 'PD7', pd: data.pd[6], pdText: String(data.pd[6]) })
+      pdValues.push({ region: 'PD6', pd: data.pd[5], pdText: String(data.pd[5]), barWidth: Math.min(100, Math.round(data.pd[5] / 40.95)) })
+      pdValues.push({ region: 'PD7', pd: data.pd[6], pdText: String(data.pd[6]), barWidth: Math.min(100, Math.round(data.pd[6] / 40.95)) })
 
       getApp().globalData.lastScanPd = data.pd
       getApp().globalData.lastScanVbat = data.vbat
     } else {
       for (var j = 0; j < 5; j++) {
-        pdValues.push({ region: regionNames[j], pd: 0, pdText: '未采集' })
+        pdValues.push({ region: regionNames[j], pd: 0, pdText: '未采集', barWidth: 0 })
       }
     }
 
@@ -97,9 +110,7 @@ Page({
   },
 
   onUnload: function () {
-    if (this._progressTimer) clearInterval(this._progressTimer)
-    if (this._timeoutTimer) clearTimeout(this._timeoutTimer)
-    if (this._onAdc) ble.off('adc', this._onAdc)
+    this._cleanup()
     ble.stopTreatment().catch(function () {})
   },