simmel-bootloader/nRF5_SDK_11.0.0_89a8197/components/libraries/slip/slip.h
2018-02-07 23:32:49 +07:00

67 lines
2.0 KiB
C

/* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
#ifndef SLIP_H__
#define SLIP_H__
#include <stdint.h>
#include "app_fifo.h"
/** @file
*
* @defgroup slip SLIP encoding decoding
* @{
* @ingroup app_common
*
* @brief This module encodes and decodes slip packages (RFC1055).
*
* @details The standard is described in https://tools.ietf.org/html/rfc1055
*/
typedef enum {
SLIP_DECODING,
SLIP_END_RECEIVED,
SLIP_ESC_RECEIVED,
SLIP_CLEARING_INVALID_PACKET,
} slip_state_t;
typedef struct {
uint8_t * p_buffer;
uint32_t current_index;
uint32_t current_length;
uint32_t len;
} buffer_t;
/**@brief Encodes a slip packet.
*
* @details Note that the encoded output data will be longer than the input data.
*
* @retval The length of the encoded packet. If it is smaller than the input length, an error has occurred.
*/
uint32_t slip_encode(uint8_t * p_output, uint8_t * p_input, uint32_t input_length, uint32_t output_buffer_length);
/**@brief Decodes a slip packet.
*
* @details When decoding a slip packet, a state must be preserved. Initial state must be set to SLIP_DECODING.
*
* @retval NRF_SUCCESS when a packet is parsed. The length of the packet can be read out from p_buf->current_index
* @retval NRF_ERROR_BUSY when packet is not finished parsing
* @retval NRF_ERROR_INVALID_DATA when packet is encoded wrong.
This moves the decoding to SLIP_CLEARING_INVALID_PACKET, and will stay in this state until SLIP_END is encountered.
*/
uint32_t slip_decoding_add_char(uint8_t c, buffer_t * p_buf, slip_state_t * current_state);
#endif // SLIP_H__
/** @} */