mirror of https://github.com/wb2osz/direwolf.git
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
#ifndef FX25_H
|
|
#define FX25_H
|
|
|
|
#include <stdint.h> // for uint64_t
|
|
|
|
|
|
/* Reed-Solomon codec control block */
|
|
struct rs {
|
|
unsigned int mm; /* Bits per symbol */
|
|
unsigned int nn; /* Symbols per block (= (1<<mm)-1) */
|
|
unsigned char *alpha_to; /* log lookup table */
|
|
unsigned char *index_of; /* Antilog lookup table */
|
|
unsigned char *genpoly; /* Generator polynomial */
|
|
unsigned int nroots; /* Number of generator roots = number of parity symbols */
|
|
unsigned char fcr; /* First consecutive root, index form */
|
|
unsigned char prim; /* Primitive element, index form */
|
|
unsigned char iprim; /* prim-th root of 1, index form */
|
|
};
|
|
|
|
#define MM (rs->mm)
|
|
#define NN (rs->nn)
|
|
#define ALPHA_TO (rs->alpha_to)
|
|
#define INDEX_OF (rs->index_of)
|
|
#define GENPOLY (rs->genpoly)
|
|
#define NROOTS (rs->nroots)
|
|
#define FCR (rs->fcr)
|
|
#define PRIM (rs->prim)
|
|
#define IPRIM (rs->iprim)
|
|
#define A0 (NN)
|
|
|
|
|
|
|
|
__attribute__((always_inline))
|
|
static inline int modnn(struct rs *rs, int x){
|
|
while (x >= rs->nn) {
|
|
x -= rs->nn;
|
|
x = (x >> rs->mm) + (x & rs->nn);
|
|
}
|
|
return x;
|
|
}
|
|
|
|
#define MODNN(x) modnn(rs,x)
|
|
|
|
|
|
#define ENCODE_RS encode_rs_char
|
|
#define DECODE_RS decode_rs_char
|
|
#define INIT_RS init_rs_char
|
|
#define FREE_RS free_rs_char
|
|
|
|
#define DTYPE unsigned char
|
|
|
|
void ENCODE_RS(struct rs *rs, DTYPE *data, DTYPE *bb);
|
|
|
|
int DECODE_RS(struct rs *rs, DTYPE *data, int *eras_pos, int no_eras);
|
|
|
|
struct rs *INIT_RS(unsigned int symsize, unsigned int gfpoly,
|
|
unsigned int fcr, unsigned int prim, unsigned int nroots);
|
|
|
|
void FREE_RS(struct rs *rs);
|
|
|
|
|
|
|
|
// These 3 are the external interface.
|
|
// Maybe these should be in a different file, separated from the internal stuff.
|
|
|
|
void fx25_init ( int debug_level );
|
|
int fx25_send_frame (int chan, unsigned char *fbuf, int flen, int fx_mode);
|
|
void fx25_rec_bit (int chan, int subchan, int slice, int dbit);
|
|
int fx25_rec_busy (int chan);
|
|
|
|
|
|
// Other functions in fx25_init.c.
|
|
|
|
struct rs *fx25_get_rs (int ctag_num);
|
|
uint64_t fx25_get_ctag_value (int ctag_num);
|
|
int fx25_get_k_data_radio (int ctag_num);
|
|
int fx25_get_k_data_rs (int ctag_num);
|
|
int fx25_get_nroots (int ctag_num);
|
|
int fx25_get_debug (void);
|
|
int fx25_tag_find_match (uint64_t t);
|
|
int fx25_pick_mode (int fx_mode, int dlen);
|
|
|
|
void fx_hex_dump(unsigned char *x, int len);
|
|
|
|
|
|
|
|
#define CTAG_MIN 0x01
|
|
#define CTAG_MAX 0x0B
|
|
|
|
// Maximum sizes of "data" and "check" parts.
|
|
|
|
#define FX25_MAX_DATA 239 // i.e. RS(255,239)
|
|
#define FX25_MAX_CHECK 64 // e.g. RS(255, 191)
|
|
#define FX25_BLOCK_SIZE 255 // Block size always 255 for 8 bit symbols.
|
|
|
|
#endif // FX25_H
|