tnc.h

#ifndef _SYSIO_TNC_H_
#define _SYSIO_TNC_H_

#include <sysio/defs.h>

#ifdef __cplusplus
  extern "C" {
#endif
/* ========================================================================== */
#include <stdio.h>

/* constants ================================================================ */
#define TNC_SOH 1
#define TNC_STX 2
#define TNC_ETX 3
#define TNC_EOT 4
#define TNC_TXT 5
#define TNC_CRC 6

typedef enum {

  TNC_SUCCESS                  =  0,
  TNC_CRC_ERROR                = -1,
  TNC_NOT_ENOUGH_MEMORY        = -2,
  TNC_OBJECT_NOT_FOUND         = -3,
  TNC_ILLEGAL_MSG              = -4,
  TNC_FILE_NOT_FOUND           = -5,
  TNC_IO_ERROR                 = -6

} eTncError;

//##############################################################################
//#                                                                            #
//#                              xTnc Class                                    #
//#                                                                            #
//##############################################################################

typedef struct xTnc {

  int fin;      
  int fout;     
  uint8_t *rxbuf;    
  size_t  len;        
  uint16_t crc_rx;  
  uint16_t crc_tx;  
  int state;
  uint8_t cnt;
  uint8_t msb;
} xTnc;

xTnc * xTncNew (size_t iRxBufferSize);

void vTncDelete (xTnc *p);

int iTncClear (xTnc *p);

int iTncSetFdin (xTnc *p, int fdin);

int iTncSetFdout (xTnc *p, int fdout);

int iTncPoll(xTnc *tnc);

ssize_t iTncWrite (xTnc *tnc, const void *buf, size_t count);

int iTncError (xTnc *tnc);

/* ========================================================================== */
#ifdef __cplusplus
  }
#endif

#endif /* _SYSIO_TNC_H_ */