71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
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/****************************************************************************
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Copyright(c) 2019 by Aerospace C.Power (Chongqing) Microelectronics. ALL RIGHTS RESERVED.
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This Information is proprietary to Aerospace C.Power (Chongqing) Microelectronics and MAY NOT
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be copied by any method or incorporated into another program without
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the express written consent of Aerospace C.Power. This Information or any portion
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thereof remains the property of Aerospace C.Power. The Information contained herein
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is believed to be accurate and Aerospace C.Power assumes no responsibility or
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liability for its use in any way and conveys no license or title under
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any patent or copyright and makes no representation or warranty that this
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Information is free from patent or copyright infringement.
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****************************************************************************/
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/* iot common header files */
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#include "os_types_api.h"
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/* iot common header files */
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#include "iot_crc_api.h"
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#include "iot_io_api.h"
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/* smart grid internal header files */
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#include "iot_sg_fr.h"
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#include "proto_acm.h"
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#if (IOT_SMART_GRID_CCO_ACM_ENABLE)
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void proto_acm_check_frame_handler(uint8_t *buffer, uint32_t buffer_len,
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bool_t *is_frame)
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{
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uint16_t frame_len;
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uint16_t fcs, fcs_offset;
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uint16_t frame_min_len;
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frame_min_len = sizeof(proto_acm_hdr_t) + sizeof(proto_acm_tail_t);
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if (buffer_len < frame_min_len) {
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*is_frame = false;
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return;
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}
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if (buffer[0] != PROTO_ACM_SOF_BYTE
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|| buffer[buffer_len - 1] != PROTO_ACM_EOF_BYTE) {
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*is_frame = false;
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return;
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}
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frame_len = (uint16_t)buffer[2];
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frame_len = (frame_len << 8) | (uint16_t)buffer[1];
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frame_len += frame_min_len;
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if (frame_len != buffer_len) {
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*is_frame = false;
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return;
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}
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fcs_offset = (uint16_t)(buffer_len - sizeof(proto_acm_tail_t));
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fcs = (uint16_t)buffer[fcs_offset + 1];
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fcs = (fcs << 8) | (uint16_t)buffer[fcs_offset];
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if (fcs != iot_getcrc16(&buffer[PROTO_ACM_SOF_BYTE_LEN],
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buffer_len - PROTO_ACM_SOF_BYTE_LEN - sizeof(proto_acm_tail_t),
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IOT_CRC16_TYPE_X25)) {
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/* checksum failure */
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*is_frame = false;
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return;
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}
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*is_frame = true;
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}
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#endif /* IOT_SMART_GRID_CCO_ACM_ENABLE */
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