Changeset 4111

Timestamp:

06/04/07 10:38:48 (6 years ago)

Author:

jgaeddert

Message:

Functional code for DepacketizerSimpleBPSK component complete; needs testing

Location:

experimental/components/DepacketizerSimpleBPSK/src

Files:

• DepacketizerDSP.cpp (modified) (1 diff)
• DepacketizerDSP.h (modified) (1 diff)
• DepacketizerSimpleBPSK.cpp (modified) (3 diffs)
• DepacketizerSimpleBPSK.h (modified) (2 diffs)

experimental/components/DepacketizerSimpleBPSK/src/DepacketizerDSP.cpp

@@ -40 +40 @@
 
     //
-    controlSequence = new char[NUM_CONTROL_CODES];
+    controlSequence = new int[NUM_CONTROL_CODES];
 
 }

experimental/components/DepacketizerSimpleBPSK/src/DepacketizerDSP.h

@@ -57 +57 @@
 
     ///
-    char * controlSequence;
+    int * controlSequence;
     
     /// Circular input buffer

experimental/components/DepacketizerSimpleBPSK/src/DepacketizerSimpleBPSK.cpp

@@ -42 +42 @@
     dataOut_1 = new standardInterfaces_i::realChar_u("controlOut");
 
-    foundSyncCode = false;
-    extractedControlBlock = false;
-    extractedDataBlock = false;
+    pnSyncCodeThreshold = PN_SYNC_CODE_LENGTH - 13;
+    operationalMode = EXTRACT_PN_SYNC_CODE;
     
     //Create the thread for the writer's processing function 
@@ -133 +132 @@
     PortTypes::CharSequence data_block_out;
     PortTypes::CharSequence control_block_out;
+    
+    PortTypes::CharSequence *bits_in(NULL);
+    
     unsigned int N;  // CORBA input block length
     unsigned int i;  // counter
 
     while( true ) {
-        /*
-        foundSyncCode = false;
-        extractedControlBlock = false;
-        extractedDataBlock = false;
-        invertBits = false;
-        */
-
-        switch ( operationalMode ) {
-        case EXTRACT_PN_SYNC_CODE:
-            //
-            break;
-        case EXTRACT_CONTROL_CODES:
-            //
-            break;
-        case EXTRACT_DATA_BLOCK:
-            //
-            break;
-        }
-
-        PortTypes::CharSequence *bits_in(NULL);
+
+        // Read input from provides port
         dataIn_0->getData(bits_in);
         N = bits_in->length();
         DEBUG(0, DepacketizerSimpleBPSK, "got " << N << " samples")
+            
 #ifdef LOGGING
         for (i=0; i<N; i++) {
@@ -169 +154 @@
 
 
-        DEBUG(0, DepacketizerSimpleBPSK, "pushing " << data_block_out.length() << " data samples")
-        dataOut_0->pushPacket( data_block_out );
-
-        DEBUG(0, DepacketizerSimpleBPSK, "pushing " << control_block_out.length() << " control samples")
-        dataOut_1->pushPacket( control_block_out );
+        for (i=0; i<N; i++) {
+
+            switch ( operationalMode ) {
+            case EXTRACT_PN_SYNC_CODE:
+                //
+                inputBuffer.Push( (*bits_in)[i] );
+                rxy = CorrelateSequence( pnSyncCode, PN_SYNC_CODE_LENGTH );
+                if ( abs(rxy) > pnSyncCodeThreshold ) {
+                    invertBits = ( rxy < 0 ) ? true : false;
+                    DEBUG(0, DepacketizerSimpleBPSK, "SYNC CODE FOUND, inversion: " << invertBits)
+                    operationalMode = EXTRACT_CONTROL_CODES;
+                }
+                break;
+            case EXTRACT_CONTROL_CODES:
+                //
+                if ( numControlCodesExtracted == NUM_CONTROL_CODES ) {
+                    DEBUG(0, DepacketizerSimpleBPSK, "CONTROL CODES EXTRACTED");
+                    DecodeControlSequence();
+                    control_block_out[0] = (char) controlOutput;
+
+                    // Set mode to extract data block
+                    numBitsExtracted = 0;
+                    operationalMode = EXTRACT_DATA_BLOCK;
+                } else {
+                    if ( numBitsExtracted == PN_CONTROL_CODE_LENGTH ) {
+                        rxy = CorrelateSequence( pnControlCode, PN_CONTROL_CODE_LENGTH );
+                        controlSequence[numControlCodesExtracted] = rxy;
+                        numControlCodesExtracted++;
+                        numBitsExtracted++;
+                    } else {
+                        inputBuffer.Push( (*bits_in)[i] );
+                        numBitsExtracted++;
+                    }
+                    break;
+                }
+            case EXTRACT_DATA_BLOCK:
+                //
+                if ( numBitsExtracted < DATA_BLOCK_LENGTH ) {
+                    data_block_out[numBitsExtracted++] = (*bits_in)[i];
+                } else {
+                    DEBUG(0, DepacketizerSimpleBPSK, "DATA BLOCK EXTRACTED!");
+                    
+                    DEBUG(0, DepacketizerSimpleBPSK, "pushing " << data_block_out.length() << " data samples")
+                    dataOut_0->pushPacket( data_block_out );
+
+                    DEBUG(0, DepacketizerSimpleBPSK, "pushing control sample")
+                    dataOut_1->pushPacket( control_block_out );
+
+                    // Reset counter variables
+                    numControlCodesExtracted = 0;
+                    numBitsExtracted = 0;
+                    operationalMode = EXTRACT_PN_SYNC_CODE;
+                }
+                break;
+            }
+        }
+
 
     }

experimental/components/DepacketizerSimpleBPSK/src/DepacketizerSimpleBPSK.h

@@ -77 +77 @@
         // ----- algorithm methods -----
 
-        bool foundSyncCode;
-        bool extractedControlBlock;
-        bool extractedDataBlock;
-        bool invertBits;               ///< negative correlation indicator
+        unsigned int numControlCodesExtracted;
+        unsigned int numBitsExtracted;
+        int pnSyncCodeThreshold;        ///<
+        bool invertBits;                ///< negative correlation indicator
 
         /// Operational mode
@@ -92 +92 @@
 };
 #endif
+