42 lines
1004 B
C++
42 lines
1004 B
C++
/* -*- c++ -*- */
|
|
|
|
/*
|
|
* construct P25 P2 TDMA frames out of raw dibits
|
|
* Copyright 2014, Max H. Parke KA1RBI
|
|
*
|
|
* usage: after constructing, call rx_sym once per received dibit.
|
|
* frame available when true is returned
|
|
*/
|
|
|
|
#ifndef INCLUDED_P25P2_FRAMER_H
|
|
#define INCLUDED_P25P2_FRAMER_H
|
|
|
|
static const unsigned int P25P2_BURST_SIZE=360; /* in bits */
|
|
static const uint64_t P25P2_FRAME_SYNC_MAGIC = 0x575D57F7FFLL;
|
|
static const uint64_t P25P2_FRAME_SYNC_REV_P = 0x575D57F7FFLL ^ 0xAAAAAAAAAALL;
|
|
static const uint64_t P25P2_FRAME_SYNC_MASK = 0xFFFFFFFFFFLL;
|
|
|
|
class p25p2_framer;
|
|
|
|
class p25p2_framer
|
|
{
|
|
private:
|
|
typedef std::vector<bool> bit_vector;
|
|
// internal instance variables and state
|
|
uint8_t d_reverse_p;
|
|
uint32_t d_next_bit;
|
|
uint32_t d_in_sync;
|
|
uint64_t nid_accum;
|
|
|
|
public:
|
|
p25p2_framer(); // constructor
|
|
~p25p2_framer (); // destructor
|
|
bool rx_sym(uint8_t dibit) ;
|
|
|
|
uint32_t symbols_received;
|
|
|
|
bit_vector d_frame_body; // all bits in frame
|
|
};
|
|
|
|
#endif /* INCLUDED_P25P2_FRAMER_H */
|