File dp_crc16.h¶

CRC-16-CCITT over a bit stream — the one CRC shared by every doppler frame producer and consumer. More...

#include <stddef.h>
#include <stdint.h>

Public Static Functions¶

Type	Name
uint16_t	dp_crc16_ccitt (const uint8_t * bits, size_t n) CRC-16-CCITT (poly 0x1021, init 0xFFFF) over a bit stream, MSB-first.

Detailed Description¶

The DSSS burst frame convention is sync | payload | CRC-16, with the 16-bit trailer computed over the payload bits only and transmitted MSB-first. burst_demod validates it on receive and the wfmgen DSSS frame builder (wfm_frame_dsss_chips) appends it on transmit; both call this one inline so the two ends can never drift.

Header-only (like wfm_synth_mls_poly) so no component grows a link-line dependency for a 10-line kernel.

Public Static Functions Documentation¶

function dp_crc16_ccitt¶

CRC-16-CCITT (poly 0x1021, init 0xFFFF) over a bit stream, MSB-first.

static inline uint16_t dp_crc16_ccitt (
    const uint8_t * bits,
    size_t n
)

Each input byte carries ONE bit (0/1) in its LSB — the natural form for the unpacked bit arrays doppler's frame paths pass around, not a packed byte-stream CRC.

Parameters:

bits Array of n bytes, each 0 or 1 (only the LSB is used).
n Number of bits.

Returns:

The 16-bit CRC; transmit it MSB-first ((crc >> 15) & 1 goes first on the wire).

The documentation for this class was generated from the following file native/inc/dp_crc16.h