Test source: added a square pattern

plugins/samplesource/testsource/readme.md

@@ -89,6 +89,9 @@ This controls the generator sample rate in samples per second.
   - **P1**: Pattern 1 is a sawtooth pattern
     - Pulse width: 1000 samples
     - Starts at full amplitude then amplitude decreases linearly down to zero
+  - **P2**: Pattern 2 is a 50% duty cycle square pattern
+    - Pulse width: 1000 samples
+    - Starts with a full amplitude pulse then down to zero for the duration of one pulse
 
 <h3>5: Modulating tone frequency</h3>
 

plugins/samplesource/testsource/testsourcegui.ui

@@ -490,6 +490,11 @@
          <string>P1</string>
         </property>
        </item>
+       <item>
+        <property name="text">
+         <string>P2</string>
+        </property>
+       </item>
       </widget>
      </item>
      <item>

plugins/samplesource/testsource/testsourceinput.cpp

@@ -362,6 +362,8 @@ bool TestSourceInput::applySettings(const TestSourceSettings& settings, bool for
                 m_testSourceThread->setPattern0();
             } else if (settings.m_modulation == TestSourceSettings::ModulationPattern1) {
                 m_testSourceThread->setPattern1();
+            } else if (settings.m_modulation == TestSourceSettings::ModulationPattern2) {
+                m_testSourceThread->setPattern2();
             }
         }
     }

plugins/samplesource/testsource/testsourcesettings.h

@@ -39,6 +39,7 @@ struct TestSourceSettings {
         ModulationFM,
         ModulationPattern0,
         ModulationPattern1,
+        ModulationPattern2,
         ModulationLast
     } Modulation;
 

plugins/samplesource/testsource/testsourcethread.cpp

@@ -324,6 +324,24 @@ void TestSourceThread::generate(quint32 chunksize)
             }
         }
         break;
+        case TestSourceSettings::ModulationPattern2: // 50% duty cycle square pattern
+        {
+            if (m_pulseSampleCount < m_pulseWidth) // 1
+            {
+                m_buf[i++] = (int16_t) (m_amplitudeBitsI + m_amplitudeBitsDC);
+                m_buf[i++] = (int16_t) (m_phaseImbalance * (float) m_amplitudeBitsQ);
+            } else { // 0
+                m_buf[i++] = m_amplitudeBitsDC;
+                m_buf[i++] = 0;
+            }
+
+            if (m_pulseSampleCount < 2*m_pulseWidth - 1) {
+                m_pulseSampleCount++;
+            } else {
+                m_pulseSampleCount = 0;
+            }
+        }
+        break;
         case TestSourceSettings::ModulationNone:
         default:
         {
@@ -419,3 +437,9 @@ void TestSourceThread::setPattern1()
     m_pulseWidth = 1000;
     m_pulseSampleCount = 0;
 }
+
+void TestSourceThread::setPattern2()
+{
+    m_pulseWidth = 1000;
+    m_pulseSampleCount = 0;
+}

plugins/samplesource/testsource/testsourcethread.h

@@ -77,6 +77,7 @@ public:
     void setFMDeviation(float deviation);
     void setPattern0();
     void setPattern1();
+    void setPattern2();
 
 private:
 	QMutex m_startWaitMutex;