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