2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 #define AO_FEC_CRC_INIT 0xffff
24 #define AO_FEC_TRELLIS_TERMINATOR 0x0b
25 #define AO_FEC_PREPARE_EXTRA 4
27 extern const uint8_t ao_fec_whiten_table[];
30 ao_fec_dump_bytes(uint8_t *bytes, uint16_t len, char *name);
33 ao_fec_crc(uint8_t *bytes, uint8_t len);
36 * 'len' is the length of the original data; 'bytes'
37 * must be four bytes longer than that, and the first
38 * two after 'len' must be the received crc
41 ao_fec_check_crc(uint8_t *bytes, uint8_t len);
44 * Append CRC and terminator bytes, returns resulting length.
45 * 'out' must be at least len + AO_FEC_PREPARE_EXTRA bytes long
48 ao_fec_prepare(uint8_t *in, uint8_t len, uint8_t *out);
51 * Whiten data using the cc1111 PN9 sequence. 'out'
52 * must be 'len' bytes long. 'out' and 'in' can be
56 ao_fec_whiten(uint8_t *in, uint8_t len, uint8_t *out);
59 * Encode and interleave data. 'out' must be len*2 bytes long
62 ao_fec_encode(uint8_t *in, uint8_t len, uint8_t *out);
65 * Decode data. 'in' is one byte per bit, soft decision
66 * 'out' must be len/8 bytes long
70 ao_fec_decode(uint8_t *in, uint16_t in_len, uint8_t *out, uint8_t out_len);
73 * Interleave data packed in bytes. 'out' must be 'len' bytes long.
76 ao_fec_interleave_bytes(uint8_t *in, uint16_t len, uint8_t *out);
78 #endif /* _AO_FEC_H_ */