DSP.h

00001 /*---------------------------------------------------------------------------
00002 
00003     QRSS Receiver Application
00004         
00005     by Clayton ZL3TKA/VK1TKA
00006     clayton@isnotcrazy.com
00007 
00008     Header File for DSP Processing class
00009 
00010 ---------------------------------------------------------------------------*/
00011 #ifndef _DSP_H
00012 #define _DSP_H
00013 
00014 #include "mbed.h"
00015 #include "BufferSys.h"
00016 
00017 // Definitions
00018 
00019 // Macros
00020 
00021 //
00022 // Classes
00023 //
00024 
00025 //---------------------------------------------------------------------------
00026 //
00027 //  DSP Processor Class - based on a buffer handle. Processes the attached samples buffer
00028 //
00029 class TDSPProcessor : public TBufferHandle
00030 {
00031 
00032     // parameters
00033     public:
00034         // Set NCO phase inc
00035         //  Set inc directly
00036         void NCOPhaseInc( uint32_t uiPhaseInc )
00037             { uiMixerPhaseIncrement = uiPhaseInc; }
00038         // Set inc from a frequency
00039         void NCOFrequency( int32_t iFreq );
00040 
00041     // results
00042     public:
00043         // get filtered output data
00044         const TDataSample FilteredOutput( int iIndex ) const
00045         {
00046             if ( !HasBuffer() || (iIndex<0) || (iIndex>=LPF_OUTPUTS_SIZE) )
00047                 return NullSample;  // return empty sample
00048             return asLPFOutputs[iIndex];
00049         }
00050 
00051     // processing operations
00052     public:
00053         // Reset processing
00054         void Reset();
00055 
00056         // Mix samples with LO
00057         bool MixLO();
00058         
00059         // LPF processing
00060         bool LPF();
00061 
00062     // data
00063     protected:
00064         // NCO mixer
00065         uint32_t        uiMixerPhaseAccumulator;
00066         uint32_t        uiMixerPhaseIncrement;
00067 
00068         // LPF outputs
00069         TDataSample     asLPFOutputs[LPF_OUTPUTS_SIZE];
00070         
00071         // LPF partial results (ready to complete with the next buffer)
00072         TLongDataSample asLPFPartials[LPF_OUTPUTS_SIZE];
00073         
00074         // LPF Partials valid flag
00075         bool            bLPFPartailsValid;
00076         
00077 };
00078 
00079 #endif
00080 
00081 //---------------------------------------------------------------------------
00082 //  END
00083 //---------------------------------------------------------------------------
00084