diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.c | 150 | ||||
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.h | 117 |
2 files changed, 267 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.c new file mode 100644 index 0000000..5e6e41b --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.c @@ -0,0 +1,150 @@ +/** + * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, must reproduce the above copyright notice, this list of + * conditions and the following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ +#include "sdk_common.h" +#if NRF_MODULE_ENABLED(SLIP) +#include "slip.h" + +#include <string.h> + + +#define SLIP_BYTE_END 0300 /* indicates end of packet */ +#define SLIP_BYTE_ESC 0333 /* indicates byte stuffing */ +#define SLIP_BYTE_ESC_END 0334 /* ESC ESC_END means END data byte */ +#define SLIP_BYTE_ESC_ESC 0335 /* ESC ESC_ESC means ESC data byte */ + + +ret_code_t slip_encode(uint8_t * p_output, uint8_t * p_input, uint32_t input_length, uint32_t * p_output_buffer_length) +{ + if (p_output == NULL || p_input == NULL || p_output_buffer_length == NULL) + { + return NRF_ERROR_NULL; + } + + *p_output_buffer_length = 0; + uint32_t input_index; + + for (input_index = 0; input_index < input_length; input_index++) + { + switch (p_input[input_index]) + { + case SLIP_BYTE_END: + p_output[(*p_output_buffer_length)++] = SLIP_BYTE_ESC; + p_output[(*p_output_buffer_length)++] = SLIP_BYTE_ESC_END; + break; + + case SLIP_BYTE_ESC: + p_output[(*p_output_buffer_length)++] = SLIP_BYTE_ESC; + p_output[(*p_output_buffer_length)++] = SLIP_BYTE_ESC_ESC; + break; + + default: + p_output[(*p_output_buffer_length)++] = p_input[input_index]; + } + } + p_output[(*p_output_buffer_length)++] = SLIP_BYTE_END; + + return NRF_SUCCESS; +} + +ret_code_t slip_decode_add_byte(slip_t * p_slip, uint8_t c) +{ + if (p_slip == NULL) + { + return NRF_ERROR_NULL; + } + + if (p_slip->current_index == p_slip->buffer_len) + { + return NRF_ERROR_NO_MEM; + } + + switch (p_slip->state) + { + case SLIP_STATE_DECODING: + switch (c) + { + case SLIP_BYTE_END: + // finished reading packet + return NRF_SUCCESS; + + case SLIP_BYTE_ESC: + // wait for + p_slip->state = SLIP_STATE_ESC_RECEIVED; + break; + + default: + // add byte to buffer + p_slip->p_buffer[p_slip->current_index++] = c; + break; + } + break; + + case SLIP_STATE_ESC_RECEIVED: + switch (c) + { + case SLIP_BYTE_ESC_END: + p_slip->p_buffer[p_slip->current_index++] = SLIP_BYTE_END; + p_slip->state = SLIP_STATE_DECODING; + break; + + case SLIP_BYTE_ESC_ESC: + p_slip->p_buffer[p_slip->current_index++] = SLIP_BYTE_ESC; + p_slip->state = SLIP_STATE_DECODING; + break; + + default: + // protocol violation + p_slip->state = SLIP_STATE_CLEARING_INVALID_PACKET; + return NRF_ERROR_INVALID_DATA; + } + break; + + case SLIP_STATE_CLEARING_INVALID_PACKET: + if (c == SLIP_BYTE_END) + { + p_slip->state = SLIP_STATE_DECODING; + p_slip->current_index = 0; + } + break; + } + + return NRF_ERROR_BUSY; +} +#endif //NRF_MODULE_ENABLED(SLIP) diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.h new file mode 100644 index 0000000..23791c0 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.h @@ -0,0 +1,117 @@ +/** + * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, must reproduce the above copyright notice, this list of + * conditions and the following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ +#ifndef SLIP_H__ +#define SLIP_H__ + +#include <stdint.h> +#include "sdk_errors.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** @file + * + * @defgroup slip SLIP encoding and decoding + * @{ + * @ingroup app_common + * + * @brief This module encodes and decodes SLIP packages. + * + * @details The SLIP protocol is described in @linkSLIP. + */ + +/** @brief Status information that is used while receiving and decoding a packet. */ +typedef enum +{ + SLIP_STATE_DECODING, //!< Ready to receive the next byte. + SLIP_STATE_ESC_RECEIVED, //!< An ESC byte has been received and the next byte must be decoded differently. + SLIP_STATE_CLEARING_INVALID_PACKET //!< The received data is invalid and transfer must be restarted. +} slip_read_state_t; + + /** @brief Representation of a SLIP packet. */ +typedef struct +{ + slip_read_state_t state; //!< Current state of the packet (see @ref slip_read_state_t). + + uint8_t * p_buffer; //!< Decoded data. + uint32_t current_index; //!< Current length of the packet that has been received. + uint32_t buffer_len; //!< Size of the buffer that is available. +} slip_t; + +/**@brief Function for encoding a SLIP packet. + * + * The maximum size of the output data is (2*input size + 1) bytes. Ensure that the provided buffer is large enough. + * + * @param[in,out] p_output The buffer where the encoded SLIP packet is stored. Ensure that it is large enough. + * @param[in,out] p_input The buffer to be encoded. + * @param[in,out] input_length The length of the input buffer. + * @param[out] p_output_buffer_length The length of the output buffer after the input has been encoded. + * + * @retval NRF_SUCCESS If the input was successfully encoded into output. + * @retval NRF_ERROR_NULL If one of the provided parameters is NULL. + */ +ret_code_t slip_encode(uint8_t * p_output, uint8_t * p_input, uint32_t input_length, uint32_t * p_output_buffer_length); + +/**@brief Function for decoding a SLIP packet. + * + * The decoded packet is put into @p p_slip::p_buffer. The index and buffer state is updated. + * + * Ensure that @p p_slip is properly initialized. The initial state must be set to @ref SLIP_STATE_DECODING. + * + * @param[in,out] p_slip State of the decoding process. + * @param[in] c Byte to decode. + * + * @retval NRF_SUCCESS If a packet has been parsed. The received packet can be retrieved from @p p_slip. + * @retval NRF_ERROR_NULL If @p p_slip is NULL. + * @retval NRF_ERROR_NO_MEM If there is no more room in the buffer provided by @p p_slip. + * @retval NRF_ERROR_BUSY If the packet has not been parsed completely yet. + * @retval NRF_ERROR_INVALID_DATA If the packet is encoded wrong. In this case, @p p_slip::state is set to @ref SLIP_STATE_CLEARING_INVALID_PACKET, + * and decoding will stay in this state until the END byte is received. + */ +ret_code_t slip_decode_add_byte(slip_t * p_slip, uint8_t c); + +#ifdef __cplusplus +} +#endif + +#endif // SLIP_H__ + +/** @} */ |