telemetry_decoder_libswiftcnav

Classes
struct	cnav_msg_t
struct	cnav_v27_part_t
struct	cnav_msg_decoder_t

Macros
#define	GPS_L2_V27_HISTORY_LENGTH_BITS   64
#define	GPS_L2C_V27_INIT_BITS   (32)
#define	GPS_L2C_V27_DECODE_BITS   (32)
#define	GPS_L2C_V27_DELAY_BITS   (32)
#define	ABS(x)   ((x) < 0 ? -(x) : (x))
#define	MIN(x, y)   (((x) < (y)) ? (x) : (y))
#define	MAX(x, y)   (((x) > (y)) ? (x) : (y))
#define	CLAMP_DIFF(a, b)   (MAX((a), (b)) - (b))

Functions
uint8_t	parity (uint32_t x)
uint32_t	getbitu (const uint8_t *buff, uint32_t pos, uint8_t len)
int32_t	getbits (const uint8_t *buff, uint32_t pos, uint8_t len)
void	setbitu (uint8_t *buff, uint32_t pos, uint32_t len, uint32_t data)
void	setbits (uint8_t *buff, uint32_t pos, uint32_t len, int32_t data)
void	bitcopy (void *dst, uint32_t dst_index, const void *src, uint32_t src_index, uint32_t count)
void	bitshl (void *buf, uint32_t size, uint32_t shift)
uint8_t	count_bits_u64 (uint64_t v, uint8_t bv)
uint8_t	count_bits_u32 (uint32_t v, uint8_t bv)
uint8_t	count_bits_u16 (uint16_t v, uint8_t bv)
uint8_t	count_bits_u8 (uint8_t v, uint8_t bv)
const v27_poly_t *	cnav_msg_decoder_get_poly (void)
void	cnav_msg_decoder_init (cnav_msg_decoder_t *dec)
bool	cnav_msg_decoder_add_symbol (cnav_msg_decoder_t *dec, unsigned char symbol, cnav_msg_t *msg, uint32_t *delay)
uint32_t	crc24q (const uint8_t *buf, uint32_t len, uint32_t crc)
uint32_t	crc24q_bits (uint32_t crc, const uint8_t *buf, uint32_t n_bits, bool invert)

Detailed Description

Utilities for CNAV message decoding by Swift Navigation Inc.

Macro Definition Documentation

GPS_L2_V27_HISTORY_LENGTH_BITS

#define GPS_L2_V27_HISTORY_LENGTH_BITS   64

Size of the Viterbi decoder history.

Definition at line 40 of file cnav_msg.h.

GPS_L2C_V27_DECODE_BITS

#define GPS_L2C_V27_DECODE_BITS   (32)

Bits to decode at a time.

Definition at line 44 of file cnav_msg.h.

GPS_L2C_V27_DELAY_BITS

#define GPS_L2C_V27_DELAY_BITS   (32)

Bits in decoder tail. We ignore them.

Definition at line 46 of file cnav_msg.h.

GPS_L2C_V27_INIT_BITS

#define GPS_L2C_V27_INIT_BITS   (32)

Bits to accumulate before decoding starts.

Definition at line 42 of file cnav_msg.h.