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/**
* KISS frame encode/decode (FEND 0xC0).
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#ifndef C1224_KISS_H
#define C1224_KISS_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#define KISS_FEND 0xC0u
#define KISS_FESC 0xDBu
#define KISS_TFEND 0xDCu
#define KISS_TFESC 0xDDu
#define KISS_CMD_DATA 0x00u
#define KISS_MAX_PAYLOAD 512
typedef struct {
uint8_t buf[KISS_MAX_PAYLOAD + 4];
size_t len;
bool in_frame;
bool esc;
} kiss_rx_t;
void kiss_rx_init(kiss_rx_t *kx);
/** Feed one byte. Returns true when a DATA payload is ready in out. */
bool kiss_rx_byte(kiss_rx_t *kx, uint8_t b, uint8_t *out, size_t *out_len);
/** Write KISS DATA frame to dst; returns bytes written (0 on overflow). */
size_t kiss_encode_data(const uint8_t *payload, size_t len,
uint8_t *dst, size_t dst_cap);
#endif /* C1224_KISS_H */
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