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https://github.com/n5ac/smartsdr-dsp.git
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94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
///*! \file gmsk_modem.h
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// * \date 02-JUN-2015
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// * \author Ed Gonzalez KG5FBT
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// */
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/* *****************************************************************************
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*
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* Copyright (C) 2012-2014 FlexRadio Systems.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Contact Information:
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* email: gpl<at>flexradiosystems.com
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* Mail: FlexRadio Systems, Suite 1-150, 4616 W. Howard LN, Austin, TX 78728
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*
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* ************************************************************************** */
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#ifndef THUMBDV_GMSK_MODEM_H_
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#define THUMBDV_GMSK_MODEM_H_
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#include "common.h"
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enum DEMOD_STATE {
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DEMOD_FALSE,
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DEMOD_TRUE,
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DEMOD_UNKNOWN
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};
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#define SC_EQ_MAX_DEPTH 3
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#define SC_EQ_FILTER_LEN 3
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typedef struct _iir_filter
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{
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float in_line[SC_EQ_FILTER_LEN];
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float out_line[SC_EQ_FILTER_LEN];
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float a[SC_EQ_FILTER_LEN];
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float b[SC_EQ_FILTER_LEN];
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} iir_filter, * IIR_FILTER;
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typedef struct _fir_filter {
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float * taps;
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uint32 length;
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float * buffer;
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uint32 buf_len;
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uint32 pointer;
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} fir_filter, * FIR_FILTER ;
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/* Used to hold state information for a GMSK Demodulator object */
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typedef struct _gmsk_demod {
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uint32 m_pll;
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BOOL m_prev;
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BOOL m_invert;
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} gmsk_demod, * GMSK_DEMOD;
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typedef struct _gmsk_mod {
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BOOL m_invert;
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FIR_FILTER filter;
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IIR_FILTER iir;
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} gmsk_mod, * GMSK_MOD;
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void gmsk_testBitsAndEncodeDecode( void );
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void gmsk_bitsToByte( BOOL * bits, unsigned char * byte );
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void gmsk_bitsToBytes( BOOL * bits, unsigned char * bytes, uint32 num_of_bits );
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void gmsk_byteToBits( unsigned char byte, BOOL * bits, uint32 num_bits );
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void gmsk_bytesToBits( unsigned char * bytes, BOOL * bits, uint32 num_bits );
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BOOL gmsk_encodeBuffer( GMSK_MOD mod, unsigned char * bytes, uint32 num_bits, float * buffer, uint32 buf_len );
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void gmsk_decodeBuffer( GMSK_DEMOD demod, float * buffer, uint32 buf_len, unsigned char * bytes, uint32 num_bits );
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void gmsk_resetMODFilter( GMSK_MOD mod );
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uint32 gmsk_encode( GMSK_MOD mod, BOOL bit, float * buffer, unsigned int length );
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enum DEMOD_STATE gmsk_decode( GMSK_DEMOD demod, float val );
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void gmskDemod_reset( GMSK_DEMOD demod );
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GMSK_MOD gmsk_createModulator( void );
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GMSK_DEMOD gmsk_createDemodulator( void );
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void gmsk_destroyModulator( GMSK_MOD mod );
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void gmsk_destroyDemodulator( GMSK_DEMOD demod );
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#endif /* THUMBDV_GMSK_MODEM_H_ */
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