分享一个开源的QT的串口示波器_qt示波器，2024年最新资深物联网嵌入式开发开发带你入门Framework

1、通信协议格式

2、帧头详细定义

3、串口通信协议

int parse_protocol(protocol_struct* pProtocol,uint16_t parseDataLen)
{
    //解析数据，使用前需提前缓冲 pProtocol->message_st.pData
    int ret = -1;
    uint16_t pos_offset;
    frame_struct* pFrameStruct = &pProtocol->frame_st;
    message_struct* pMessageStruct = &pProtocol->message_st;
    if (check_protocol_heade(pMessageStruct->pData) == PROTOCOL_RESULT_OK)
    {
        //更新帧头数据
        pFrameStruct->header.sof            = pMessageStruct->pData[0];
        //获取data段的数据长度
        pFrameStruct->header.data_length    = (pMessageStruct->pData[2] << 8) | (pMessageStruct->pData[1]);
        pFrameStruct->header.crc_check      = pMessageStruct->pData[3];
        //获取此次数据包长度
        pMessageStruct->data_len = pFrameStruct->header.data_length + PROTOCOL_DATA_OFFSET + 2;
        //计算解析后得到的 data_union 数据长度
        pFrameStruct->frame_user.cmd_data.data_len = (pFrameStruct->header.data_length) / sizeof(data_union);
        if(pMessageStruct->data_len<=parseDataLen)
        {
            if (pMessageStruct->data_len <= pMessageStruct->max_data_len)
            {
                if(CRC16_Check_Sum(&pMessageStruct->pData[0], pMessageStruct->data_len) != 0)
                {
                    pFrameStruct->frame_user.equipment_type = (pMessageStruct->pData[5]<<8) | (pMessageStruct->pData[4]);
                    pFrameStruct->frame_user.equipment_id   = (pMessageStruct->pData[7] << 8) | (pMessageStruct->pData[6]);
                    pFrameStruct->frame_user.data_id        = (pMessageStruct->pData[9] << 8) | (pMessageStruct->pData[8]);
                    //拷贝 data段 指定长度数据
                    ret = (int)memcpy(&pFrameStruct->frame_user.cmd_data.pData[0], &pMessageStruct->pData[PROTOCOL_DATA_OFFSET], pFrameStruct->header.data_length);
                    pos_offset = pFrameStruct->header.data_length + PROTOCOL_DATA_OFFSET;
                    pFrameStruct->frame_tail = (pMessageStruct->pData[pos_offset+1] << 8) | (pMessageStruct->pData[pos_offset]);
                    return PROTOCOL_RESULT_OK;
                }
                else
                {
                    //待解析BUFF超过预定解析数据容量，避免内存越界
                    PROTOCOL_ERROR_PRINTF("parse_protocol->>CRC16_Check_Sum err!\n");
                    return PROTOCOL_RESULT_CHECK_FRAME_ERR;
                }
            }
            else
            {
                //待解析BUFF超过预定解析数据容量，避免内存越界
                PROTOCOL_ERROR_PRINTF("parse_protocol->>data_len[%d] > max_data_len[%d]!\n",
                    pMessageStruct->data_len,
                    pMessageStruct->max_data_len);
                return PROTOCOL_RESULT_OUT_OF_LEN;
            }
        }
        else
        {
            //通过包头计算，还未收到完整的数据包
//            PROTOCOL_ERROR_PRINTF("parse_protocol->>data_len[%d] > max_data_len[%d]!\n",
//                pMessageStruct->data_len,
//                pMessageStruct->max_data_len);
            return PROTOCOL_RESULT_OUT_OF_LEN;
        }
    }
    else
    {
        //待解析BUFF超过预定解析数据容量，避免内存越界
        PROTOCOL_ERROR_PRINTF("parse_protocol->>check_protocol_heade err!\n");
        return PROTOCOL_RESULT_CHECK_HEAD_ERR;
    }
    PROTOCOL_DEBUG_PRINTF("parse_protocol->>check_protocol_heade ok!\n");
    return PROTOCOL_RESULT_ERR;
}



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