ax25.h

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#ifndef NET_AX25_H
#define NET_AX25_H

#include "cfg/cfg_ax25.h"

#include <cfg/compiler.h>
#include <kern/kfile.h>

#define AX25_MIN_FRAME_LEN 18

#define AX25_CRC_CORRECT 0xF0B8

struct AX25Msg; // fwd declaration

typedef void (*ax25_callback_t)(struct AX25Msg *msg);


typedef struct AX25Ctx
{
    uint8_t buf[CONFIG_AX25_FRAME_BUF_LEN]; 
    KFile *ch;        
    size_t frm_len;   
    uint16_t crc_in;  
    uint16_t crc_out; 
    ax25_callback_t hook; 
    bool sync;   
    bool escape; 
} AX25Ctx;


typedef struct AX25Call
{
    char call[6]; 
    uint8_t ssid; 
} AX25Call;

#define AX25_CALL(str, id) ({ static const AX25Call _call = { .call = (str), .ssid = (id) }; &_call; })

#define AX25_MAX_RPT 8


typedef struct AX25Msg
{
    AX25Call src;  
    AX25Call dst;  
    #if CONFIG_AX25_RPT_LST
    AX25Call rpt_lst[AX25_MAX_RPT]; 
    uint8_t rpt_cnt; 
    #endif
    uint16_t ctrl; 
    uint8_t pid;   
    const uint8_t *info; 
    size_t len;    
} AX25Msg;

#define AX25_CTRL_UI      0x03
#define AX25_PID_NOLAYER3 0xF0

#define HDLC_FLAG  0x7E
#define HDLC_RESET 0x7F
#define AX25_ESC   0x1B
/* \} */



void ax25_poll(AX25Ctx *ctx);
void ax25_send(AX25Ctx *ctx, const AX25Call *dst, const AX25Call *src, const void *_buf, size_t len);
void ax25_init(AX25Ctx *ctx, KFile *channel, ax25_callback_t hook);

int ax25_testSetup(void);
int ax25_testTearDown(void);
int ax25_testRun(void);

#endif /* NET_AX25_H */