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c61a343193
This simplifies and solidifies the reversal of SLIP's byte-stuffing (aka byte-unstuffing ;-)) by 1. Using `tsrb` instead of `ringbuffer`: there are two actors. The ISR and the device's event handler. 2. Moving the byte-unstuffing from the UART RX-handler (i.e. the ISR) to the device's receive function (potentially not the ISR) 3. Removing the `pktfifo` member. The current number of bytes in the ringbuffer is returned for `recv(data = NULL, len = 0)`. If that is more than the packet contains (due to the byte stuffing it most likely will be) the packet is reallocated in GNRC anyway.
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
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* Copyright (C) 2015-17 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup drivers_slipdev SLIP network device
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* @ingroup drivers_netdev
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* @brief SLIP network device over @ref drivers_periph_uart
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* @see [RFC 1055](https://github.com/RIOT-OS/RIOT/pull/6487)
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* @{
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*
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* @file
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* @brief SLIP device definitions
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*
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* @author Martine Lenders <m.lenders@fu-berlin.de>
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*/
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#ifndef SLIPDEV_H
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#define SLIPDEV_H
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#include <stdint.h>
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#include "cib.h"
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#include "net/netdev.h"
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#include "periph/uart.h"
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#include "tsrb.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief UART buffer size used for TX and RX buffers
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*
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* Reduce this value if your expected traffic does not include full IPv6 MTU
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* sized packets.
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*
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* @pre Needs to be power of two and `<= INT_MAX`
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*/
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#ifndef SLIPDEV_BUFSIZE
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#define SLIPDEV_BUFSIZE (2048U)
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#endif
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/**
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* @brief Configuration parameters for a slipdev
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*/
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typedef struct {
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uart_t uart; /**< UART interface the device is connected to */
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uint32_t baudrate; /**< baudrate to use with slipdev_params_t::uart */
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} slipdev_params_t;
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/**
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* @brief Device descriptor for slipdev
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*
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* @extends netdev_t
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*/
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typedef struct {
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netdev_t netdev; /**< parent class */
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slipdev_params_t config; /**< configuration parameters */
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tsrb_t inbuf; /**< RX buffer */
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char rxmem[SLIPDEV_BUFSIZE]; /**< memory used by RX buffer */
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uint16_t inesc; /**< device previously received an escape
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* byte */
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} slipdev_t;
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/**
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* @brief Setup a slipdev device state
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*
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* @param[in] dev device descriptor
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* @param[in] params parameters for device initialization
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*/
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void slipdev_setup(slipdev_t *dev, const slipdev_params_t *params);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SLIPDEV_H */
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/** @} */
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