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https://github.com/jam422470459/EPD-nRF52-hema213.git
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143 lines
5.0 KiB
C
143 lines
5.0 KiB
C
/**
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* Copyright (c) 2015 - 2017, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "sdk_common.h"
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#if NRF_MODULE_ENABLED(SLIP)
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#include "slip.h"
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#include "nrf_error.h"
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#define SLIP_END 0300 /* indicates end of packet */
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#define SLIP_ESC 0333 /* indicates byte stuffing */
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#define SLIP_ESC_END 0334 /* ESC ESC_END means END data byte */
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#define SLIP_ESC_ESC 0335 /* ESC ESC_ESC means ESC data byte */
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uint32_t slip_encode(uint8_t * p_output, uint8_t * p_input, uint32_t input_length, uint32_t output_buffer_length)
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{
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uint32_t input_index;
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uint32_t output_index;
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for (input_index = 0, output_index = 0; input_index < input_length && output_index < output_buffer_length; input_index++)
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{
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switch (p_input[input_index])
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{
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case SLIP_END:
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p_output[output_index++] = SLIP_END;
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p_output[output_index++] = SLIP_ESC_END;
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break;
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case SLIP_ESC:
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p_output[output_index++] = SLIP_ESC;
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p_output[output_index++] = SLIP_ESC_ESC;
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break;
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default:
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p_output[output_index++] = p_input[input_index];
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}
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}
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p_output[output_index++] = (uint8_t)SLIP_END;
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p_output[output_index++] = (uint8_t)SLIP_END; // clarify that the packet has ended.
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return output_index;
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}
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uint32_t slip_decoding_add_char(uint8_t c, buffer_t * p_buf, slip_state_t * current_state)
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{
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switch (*current_state)
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{
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case SLIP_DECODING:
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if (c == SLIP_END)
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{
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*current_state = SLIP_END_RECEIVED;
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}
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else if (c == SLIP_ESC)
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{
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*current_state = SLIP_END_RECEIVED;
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}
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else
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{
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p_buf->p_buffer[p_buf->current_index++] = c;
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p_buf->current_length++;
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}
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break;
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case SLIP_ESC_RECEIVED:
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if (c == SLIP_ESC_ESC)
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{
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p_buf->p_buffer[p_buf->current_index++] = SLIP_ESC;
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p_buf->current_length++;
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*current_state = SLIP_DECODING;
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}
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else
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{
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// violation of protocol
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*current_state = SLIP_CLEARING_INVALID_PACKET;
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return NRF_ERROR_INVALID_DATA;
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}
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break;
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case SLIP_END_RECEIVED:
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if (c == SLIP_ESC_END)
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{
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p_buf->p_buffer[p_buf->current_index++] = SLIP_END;
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p_buf->current_length++;
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*current_state = SLIP_DECODING;
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}
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else
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{
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// packet is finished
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*current_state = SLIP_DECODING;
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return NRF_SUCCESS;
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}
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break;
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case SLIP_CLEARING_INVALID_PACKET:
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if (c == SLIP_END)
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{
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*current_state = SLIP_DECODING;
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p_buf->current_index = 0;
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p_buf->current_length = 0;
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}
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break;
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}
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return NRF_ERROR_BUSY;
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}
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#endif //NRF_MODULE_ENABLED(SLIP)
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