1 /* Configure the RS codec with fixed parameters for CCSDS standard 2 * (255,223) code over GF(256). Note: the conventional basis is still 3 * used; the dual-basis mappings are performed in [en|de]code_rs_ccsds.c 4 * 5 * Copyright 2002 Phil Karn, KA9Q 6 * May be used under the terms of the GNU General Public License (GPL) 7 */ 8 #define DTYPE unsigned char 9 10 #include <gnuradio/fec/api.h> 11 mod255(int x)12static inline int mod255(int x) 13 { 14 while (x >= 255) { 15 x -= 255; 16 x = (x >> 8) + (x & 255); 17 } 18 return x; 19 } 20 #define MODNN(x) mod255(x) 21 22 extern unsigned char CCSDS_alpha_to[]; 23 extern unsigned char CCSDS_index_of[]; 24 extern unsigned char CCSDS_poly[]; 25 26 #define MM 8 27 #define NN 255 28 #define ALPHA_TO CCSDS_alpha_to 29 #define INDEX_OF CCSDS_index_of 30 #define GENPOLY CCSDS_poly 31 #define NROOTS 32 32 #define FCR 112 33 #define PRIM 11 34 #define IPRIM 116 35 #define A0 (NN) 36 37 #define ENCODE_RS encode_rs_8 38 #define DECODE_RS decode_rs_8 39 40 FEC_API void ENCODE_RS(DTYPE* data, DTYPE* parity); 41 FEC_API int DECODE_RS(DTYPE* data, int* eras_pos, int no_eras);