diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/slip/slip.c | 150 |
1 files changed, 150 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) |