Fix potential crash bug in serial worker, add ability to define ECU

scanning range in UDS scanner

serialworker.cpp

@@ -435,6 +435,7 @@ void SerialWorker::handleTick()
     {
         if (!gotValidated)
         {
+            if (serial == NULL) return;
             if (serial->isOpen()) //if it's still false we have a problem...
             {
                 qDebug() << "Comm validation failed. ";

udsscanwindow.cpp

@@ -36,13 +36,16 @@ void UDSScanWindow::scanUDS()
     sendingFrames.clear();
 
     CANFrame frame;
+    int startID, endID;
+    startID = Utility::ParseStringToNum(ui->txtStartID->text());
+    endID = Utility::ParseStringToNum(ui->txtEndID->text());
 
     int buses = ui->cbBuses->currentIndex();
     buses++;
     if (buses < 1) buses = 1;
     for (int typ = 1; typ < 5; typ++)
     {
-        for (int id = 0x7E0; id < 0x7E8; id++)
+        for (int id = startID; id < endID; id++)
         {
             frame.ID = id;
             frame.len = 8;

udsscanwindow.ui

@@ -24,6 +24,46 @@
    <item>
     <widget class="QListWidget" name="listResults"/>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QLabel" name="label_4">
+         <property name="text">
+          <string>Starting ID</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="txtStartID">
+         <property name="text">
+          <string>0x7E0</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QLabel" name="label_3">
+         <property name="text">
+          <string>Ending ID</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="txtEndID">
+         <property name="text">
+          <string>0x7E7</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+    </layout>
+   </item>
    <item>
     <widget class="QLabel" name="label">
      <property name="text">