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/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#ifndef _AO_FEC_H_
#define _AO_FEC_H_
#include <stdint.h>
#define AO_FEC_CRC_INIT 0xffff
#define AO_FEC_TRELLIS_TERMINATOR 0x0b
#define AO_FEC_PREPARE_EXTRA 4
extern const uint8_t ao_fec_whiten_table[];
void
ao_fec_dump_bytes(uint8_t *bytes, uint16_t len, char *name);
uint16_t
ao_fec_crc(uint8_t *bytes, uint8_t len);
/*
* 'len' is the length of the original data; 'bytes'
* must be four bytes longer than that, and the first
* two after 'len' must be the received crc
*/
uint8_t
ao_fec_check_crc(uint8_t *bytes, uint8_t len);
/*
* Append CRC and terminator bytes, returns resulting length.
* 'out' must be at least len + AO_FEC_PREPARE_EXTRA bytes long
*/
uint8_t
ao_fec_prepare(uint8_t *in, uint8_t len, uint8_t *out);
/*
* Whiten data using the cc1111 PN9 sequence. 'out'
* must be 'len' bytes long. 'out' and 'in' can be
* the same array
*/
void
ao_fec_whiten(uint8_t *in, uint8_t len, uint8_t *out);
/*
* Encode and interleave data. 'out' must be len*2 bytes long
*/
uint8_t
ao_fec_encode(uint8_t *in, uint8_t len, uint8_t *out);
/*
* Decode data. 'in' is one byte per bit, soft decision
* 'out' must be len/8 bytes long
*/
#define AO_FEC_DECODE_BLOCK (8 * 32) /* callback must return multiples of this many bits */
uint8_t
ao_fec_decode(uint8_t *in, uint16_t in_len, uint8_t *out, uint8_t out_len, uint16_t (*callback)());
/*
* Interleave data packed in bytes. 'out' must be 'len' bytes long.
*/
uint16_t
ao_fec_interleave_bytes(uint8_t *in, uint16_t len, uint8_t *out);
#endif /* _AO_FEC_H_ */
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