SLIP

Functions
err_t	slipif_init (struct netif *netif)
void	slipif_poll (struct netif *netif)

Detailed Description

This is an arch independent SLIP netif. The specific serial hooks must be provided by another file. They are sio_open, sio_read/sio_tryread and sio_send

Usage: This netif can be used in three ways:
1) For NO_SYS==0, an RX thread can be used which blocks on sio_read() until data is received.
2) In your main loop, call slipif_poll() to check for new RX bytes, completed packets are fed into netif->input().
3) Call slipif_received_byte[s]() from your serial RX ISR and slipif_process_rxqueue() from your main loop. ISR level decodes packets and puts completed packets on a queue which is fed into the stack from the main loop (needs SYS_LIGHTWEIGHT_PROT for pbuf_alloc to work on ISR level!).

Function Documentation

slipif_init()

err_t slipif_init

(

struct netif *

netif

)

SLIP netif initialisation

Call the arch specific sio_open and remember the opened device in the state field of the netif.

Parameters

netif

the lwip network interface structure for this slipif

Returns

ERR_OK if serial line could be opened, ERR_MEM if no memory could be allocated, ERR_IF is serial line couldn't be opened

Note

If netif->state is interpreted as an u8_t serial port number.

References ERR_IF, ERR_MEM, ERR_OK, slipif_priv::i, netif::input, LWIP_ASSERT, LWIP_DEBUGF, LWIP_PTR_NUMERIC_CAST, mem_free(), mem_malloc(), MIB2_INIT_NETIF, netif::mtu, netif::name, NULL, slipif_priv::p, slipif_priv::q, slipif_priv::recved, slipif_priv::sd, sio_open(), SLIP_DEBUG, SLIP_MAX_SIZE, SLIP_RECV_NORMAL, SLIP_SIO_SPEED, SLIPIF_THREAD_NAME, SLIPIF_THREAD_PRIO, SLIPIF_THREAD_STACKSIZE, netif::state, slipif_priv::state, sys_thread_new(), and U16_F.

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slipif_poll()

void slipif_poll

(

struct netif *

netif

)

Polls the serial device and feeds the IP layer with incoming packets.

Parameters

netif

The lwip network interface structure for this slipif

References LWIP_ASSERT, NULL, slipif_priv::sd, sio_tryread(), slipif_rxbyte_input(), and netif::state.

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