libpca slip.h excerpt

slip.h

/**
 * @brief if there are no SEND/RECV routine definitions already existing
 *  use the default definitions provided bellow
 */
#if !defined(SLIP_CHAR_SEND) || !defined(SLIP_CHAR_RECV)

#include "config.h"
#include "serial.h"

/// redefine it, in your code to use different implementation of SEND routine
#define SLIP_CHAR_SEND(__x)	serial_poll_sendc(__x)

/// redefine it, in your code to use different implementation of RECV routine
#define SLIP_CHAR_RECV(__x) serial_getc(__x)

#endif