/// <summary>
/// 解析单字节入口函数
/// </summary>
/// <param name="data">待解析的字节</param>
private void Parse_Byte(byte data)
{
// 如果接收到起始字节
if (Gps_NmeaFrame.NMEA_FRAME_HEAD_BYTE == data)
{
// 清除帧类型指示
mTmpFrameType = NMEA_FRAME_TYPE_NULL;
// 清空临时缓冲字符串
mStrBuffer = "";
// 复位计数器
ParseMoniterCnt = 0;
// 清除CRC校验
Current_Crc = 0;
// 添加字符到缓冲
mStrBuffer += (char)data;
// 切换到下一个状态
Current_State = NmeaFrame_ParseState.Head_State;
}
else
{ // 如果当前状态不为空状态
if (Current_State != NmeaFrame_ParseState.Null_State)
{
ParseMoniter[Current_State](data);
}
}
}
/// <summary>
/// 初始化解析状态机，初始化每个动作所执行的操作
/// </summary>
private void NmeaParseMoniterInit()
{
// 初始化状态机
ParseMoniter = new Dictionary <NmeaFrame_ParseState, Action <byte> >();
Current_State = NmeaFrame_ParseState.Null_State;
//帧头状态
ParseMoniter[NmeaFrame_ParseState.Head_State] = (byte data) =>
{
// 计算crc
Current_Crc ^= data;
// 如果获得分隔符
if (data == Gps_NmeaFrame.NMEA_FRAME_SEPARATE_BYTE)
{
string talkerid;
string contentid;
// 如果分析成功
if (Gps_NmeaFrame.GetHeadInfo(mStrBuffer, out talkerid, out contentid) == true)
{
// 清除缓冲
mStrBuffer = "";
// 清除计数器
ParseMoniterCnt = 0;
// 根据帧类型保存帧类型状态
if (contentid.Equals(NMEA_FRAME_CONTENTID_GGA))
{
mTmpFrameType = NMEA_FRAME_TYPE_GGA;
}
else if (contentid.Equals(NMEA_FRAME_CONTENTID_RMC))
{
mTmpFrameType = NMEA_FRAME_TYPE_RMC;
}
else if (contentid.Equals(NMEA_FRAME_CONTENTID_GSV))
{
mTmpFrameType = NMEA_FRAME_TYPE_GSV;
}
else if (contentid.Equals(NMEA_FRAME_CONTENTID_GAS))
{
mTmpFrameType = NMEA_FRAME_TYPE_GAS;
}
else if (contentid.Equals(NMEA_FRAME_CONTENTID_GSA))
{
mTmpFrameType = NMEA_FRAME_TYPE_GSA;
}
else if (contentid.Equals(NMEA_FRAME_CONTENTID_HPD))
{
mTmpFrameType = NMEA_FRAME_TYPE_HPD;
}
else
{
Current_State = NmeaFrame_ParseState.Null_State;
return;
}
// 清除缓冲数组
mGpsMsgBuff[mTmpFrameType].Clear();
// 添加帧头到头部
mGpsMsgBuff[mTmpFrameType].AddHead(talkerid, contentid);
// 切换到下一个状态
Current_State = NmeaFrame_ParseState.Data_State;
} // 分析出错
else
{ // 复位状态机
Current_State = NmeaFrame_ParseState.Null_State;
}
} // 如果没有获得分隔符
else
{
// 添加数据到临时缓冲
mStrBuffer += (char)data;
}
// 如果索引值超出限制，直接恢复状态机
if (ParseMoniterCnt++ > (Gps_NmeaFrame.NMEA_FRAME_HEAD_LEN - 1))
{
Current_State = NmeaFrame_ParseState.Null_State;
}
};
//帧数据状态
ParseMoniter[NmeaFrame_ParseState.Data_State] = (byte data) =>
{
// 是否获取到了校验位指示符
if (data == Gps_NmeaFrame.NMEA_FRAME_CRC_IDENTIFIER_BYTE)
{
// 添加到缓冲区
mGpsMsgBuff[mTmpFrameType].AddData(mStrBuffer);
// 清除缓冲
mStrBuffer = "";
// 清除计数器
ParseMoniterCnt = 0;
// 跳转到CrcState
Current_State = NmeaFrame_ParseState.Crc_State;
}
else
{
// 计算校验
Current_Crc ^= data;
// 是否为分隔符
if (data == Gps_NmeaFrame.NMEA_FRAME_SEPARATE_BYTE)
{
// 添加到缓冲区
mGpsMsgBuff[mTmpFrameType].AddData(mStrBuffer);
// 清楚缓冲区
mStrBuffer = "";
}
else
{
// 添加字符到缓冲
mStrBuffer += (char)data;
}
}
// 如果超出限制，直接复位状态机
if (ParseMoniterCnt++ > Gps_NmeaFrame.NMEA_FRAME_DATA_LEN_MAX)
{
Current_State = NmeaFrame_ParseState.Null_State;
}
};
// 帧校验状态
ParseMoniter[NmeaFrame_ParseState.Crc_State] = (byte data) =>
{
// 如果接收到了第一个结束字符
if (data == Gps_NmeaFrame.NMEA_FRAME_END_IDENTIFIER1_BYTE)
{
byte crc;
// 获取crc
crc = Convert.ToByte(mStrBuffer, 16);
if (crc == Current_Crc)
{
mGpsMsgBuff[mTmpFrameType].AddCrc(mStrBuffer);
Current_State = NmeaFrame_ParseState.End_State;
return;
}
}
else
{
mStrBuffer += (char)data;
}
// 如果超出限制，复位状态机
if (ParseMoniterCnt++ > Gps_NmeaFrame.NMEA_FRAME_DATA_CRC_LEN)
{
Current_State = NmeaFrame_ParseState.Null_State;
}
};
// 帧结束状态
ParseMoniter[NmeaFrame_ParseState.End_State] = (byte data) =>
{
// 如果接收到第二个字符
if (data == Gps_NmeaFrame.NMEA_FRAME_END_IDENTIFIER2_BYTE)
{
// 处理当前帧
SelfDeal(mGpsMsgBuff[mTmpFrameType], mTmpFrameType);
// 此处需要清除帧缓冲
mGpsMsgBuff[mTmpFrameType].Clear();
}
Current_State = NmeaFrame_ParseState.Null_State;
};
}
