slipif.c File Reference

#include "netif/slipif.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/pbuf.h"
#include "lwip/stats.h"
#include "lwip/snmp.h"
#include "lwip/sys.h"
#include "lwip/sio.h"

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Classes
struct	slipif_priv

Macros
#define	SLIP_END   0xC0 /* 0300: start and end of every packet */
#define	SLIP_ESC   0xDB /* 0333: escape start (one byte escaped data follows) */
#define	SLIP_ESC_END   0xDC /* 0334: following escape: original byte is 0xC0 (END) */
#define	SLIP_ESC_ESC   0xDD /* 0335: following escape: original byte is 0xDB (ESC) */
#define	SLIP_MAX_SIZE   1500
#define	SLIP_SIO_SPEED(sio_fd)   0

Enumerations
enum	slipif_recv_state { SLIP_RECV_NORMAL , SLIP_RECV_ESCAPE }

Functions
static err_t	slipif_output (struct netif *netif, struct pbuf *p)
static struct pbuf *	slipif_rxbyte (struct netif *netif, u8_t c)
static void	slipif_rxbyte_input (struct netif *netif, u8_t c)
err_t	slipif_init (struct netif *netif)
void	slipif_poll (struct netif *netif)

Detailed Description

SLIP Interface

Macro Definition Documentation

SLIP_END

#define SLIP_END   0xC0 /* 0300: start and end of every packet */

SLIP_ESC

#define SLIP_ESC   0xDB /* 0333: escape start (one byte escaped data follows) */

SLIP_ESC_END

#define SLIP_ESC_END   0xDC /* 0334: following escape: original byte is 0xC0 (END) */

SLIP_ESC_ESC

#define SLIP_ESC_ESC   0xDD /* 0335: following escape: original byte is 0xDB (ESC) */

SLIP_MAX_SIZE

#define SLIP_MAX_SIZE   1500

Maximum packet size that is received by this netif

SLIP_SIO_SPEED

#define SLIP_SIO_SPEED

(

sio_fd

)

0

Define this to the interface speed for SNMP (sio_fd is the sio_fd_t returned by sio_open). The default value of zero means 'unknown'.

Enumeration Type Documentation

slipif_recv_state

enum slipif_recv_state

Enumerator
SLIP_RECV_NORMAL
SLIP_RECV_ESCAPE

Function Documentation

slipif_output()

static err_t slipif_output ( struct netif *  netif, struct pbuf *  p  )

static

Send a pbuf doing the necessary SLIP encapsulation

Uses the serial layer's sio_send()

Parameters

netif	the lwip network interface structure for this slipif
p	the pbuf chain packet to send

Returns

always returns ERR_OK since the serial layer does not provide return values

References ERR_OK, slipif_priv::i, pbuf::len, LWIP_ASSERT, LWIP_DEBUGF, pbuf::next, NULL, slipif_priv::p, pbuf::payload, slipif_priv::q, slipif_priv::sd, sio_send(), SLIP_DEBUG, SLIP_END, SLIP_ESC, SLIP_ESC_END, SLIP_ESC_ESC, netif::state, pbuf::tot_len, and U16_F.

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slipif_rxbyte()

static struct pbuf* slipif_rxbyte ( struct netif *  netif, u8_t  c  )

static

Handle the incoming SLIP stream character by character

Parameters

netif	the lwip network interface structure for this slipif
c	received character (multiple calls to this function will return a complete packet, NULL is returned before - used for polling)

Returns

The IP packet when SLIP_END is received

References slipif_priv::i, pbuf::len, LINK_STATS_INC, LWIP_ASSERT, LWIP_DEBUGF, pbuf::next, NULL, slipif_priv::p, pbuf::payload, pbuf_alloc(), pbuf_cat(), PBUF_LINK, PBUF_LINK_ENCAPSULATION_HLEN, PBUF_LINK_HLEN, PBUF_POOL, PBUF_POOL_BUFSIZE, pbuf_realloc(), slipif_priv::q, slipif_priv::recved, SLIP_DEBUG, SLIP_END, SLIP_ESC, SLIP_ESC_END, SLIP_ESC_ESC, SLIP_MAX_SIZE, SLIP_RECV_ESCAPE, SLIP_RECV_NORMAL, netif::state, slipif_priv::state, and U16_F.

Referenced by slipif_rxbyte_input().

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slipif_rxbyte_input()

static void slipif_rxbyte_input ( struct netif *  netif, u8_t  c  )

static

Like slipif_rxbyte, but passes completed packets to netif->input

Parameters

netif	The lwip network interface structure for this slipif
c	received character

References ERR_OK, netif::input, NULL, pbuf_free(), and slipif_rxbyte().

Referenced by slipif_poll().

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