向各位请教一个串口通讯的问题

Question

使用 VARIANT 类型，在MSDN里查

Answer 1

用outp()
例如：
handle=0x3e8;
outp(handle,0x77);
outp(handle,'3');
......

Answer 2

用createfile()初始化端口，writefile()写端口，这是windows ApI 函数，在vc 中可用，具体看程序资料

Answer 3

HANDLE m_hCom; //通讯口句柄
DCB dcb; //设备控制模块
COMSTAT comStat; //串口状态 BOOL DevState[64];   //保存设备状态

BYTE Command[20]; //一体化摄像头控制数据 int i;
DWORD lpNumber;
int oper;
BOOL Error;
if(kongzhilx == 0)
{
switch(Make)
{
case AL578CR:
switch(Direction)
{
case COM_YUNTAI_LEFT:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x02; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=MoveSpeed; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case COM_YUNTAI_RIGHT:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x01; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=MoveSpeed; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case COM_YUNTAI_UP:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x04; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=MoveSpeed; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case COM_YUNTAI_DOWN:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x08; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=MoveSpeed; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case COM_YUNTAI_STOP:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x00; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256;

Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case ZOOMWIDE:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x10; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256;

Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case ZOOMTELE:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x20; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case FOCUSNEAR:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x40; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
case FOCUSFAR:
Command[0]=0x02; //STX
Command[1]=Address; //Adr
Command[2]=0x01; //Cmd
Command[3]=0x80; //Data1 Pan Left
Command[4]=0x00; //Data2
Command[5]=0;     //CheckSum
for(i=0;i<5;i++)
Command[5]+=Command[i];
Command[5]=Command[5]%256; Speed[0]=0x02; //STX
Speed[1]=Address; //Adr
Speed[2]=0x0E; //Cmd
Speed[3]=0x00; //速度64
Speed[4]=0x00; //Data2
Speed[5]=0;     //CheckSum
for(i=0;i<5;i++)
Speed[5]+=Speed[i];
Speed[5]=Speed[5]%256;
break;
default:
break;
} m_hCom=InitYiti(Make,Kongzhi); //串口初始化
if(m_hCom==NULL)
{
// AfxMessageBox("串口初始化失败！");
return FALSE;
}

Error = WriteFile(m_hCom,Speed,6,&lpNumber,NULL);  //send the data of bytes
if(!Error)
{
// AfxMessageBox("发送命令失败 ！");
CloseHandle(m_hCom);
return FALSE;
} Error = WriteFile(m_hCom,Command,6,&lpNumber,NULL);  //send the data of bytes
if(!Error)
{
// AfxMessageBox("发送命令失败 ！");
CloseHandle(m_hCom);
return FALSE;
}HANDLE CControlIO::InitYuntai(int Make)
{
HANDLE hCom = CreateFile("COM2",GENERIC_READ|GENERIC_WRITE, 
0,NULL,OPEN_EXISTING,FILE_FLAG_OVERLAPPED ,NULL);
if(hCom == INVALID_HANDLE_VALUE)
{
AfxMessageBox("CreateFile()失败 InitYuntai！");
return NULL;
}

BOOL Error = SetupComm(hCom,128,128); //创建输入输出队列缓存
if(!Error)
CloseHandle(hCom);
Error = GetCommState(hCom,&dcb); //得到串口状态
if(!Error)
CloseHandle(hCom); //设置COM2通信参数
switch(Make){
case ADT:
dcb.BaudRate    = 9600;
dcb.ByteSize    = 8;
dcb.Parity      = MARKPARITY;
dcb.StopBits    = ONESTOPBIT;
break;
case M832:
dcb.BaudRate    = m_intCom2Speed;
dcb.ByteSize    = 8;
dcb.Parity      = MARKPARITY;
dcb.StopBits    = ONESTOPBIT;
break;
} Error = SetCommState(hCom,&dcb);
if(!Error)
{
CloseHandle(hCom);
} EscapeCommFunction(hCom,SETRTS);//设置为发送状态 return hCom;
}

Answer 4

void CComIO::OutPut(const CByteArray &Data)
{
m_pMSComCtrl->SetOutput(COleVariant(Data));
}void CComIO::OutPut(BYTE *pData, int Length)
{
int i;
CByteArray Data;
Data.SetSize(Length);
for(i=0;i<Length;i++,pData++)
Data[i]=*pData;
OutPut(Data);
}void CComIO::OutPut(CString Str)
{
int i,Length;
CByteArray Data;
Length=Str.GetLength();
Data.SetSize(Length);
for(i=0;i<Length;i++)
Data[i]=Str[i];
OutPut(Data);
}

Answer 5

vastsky(戴二郎) ,能再说的具体些吗？  handle的值是什么？

Answer 6

DCB       dcb;char  data[1024],recv_data[1024];
DWORD   len,send_len,error_code;  hCom = CreateFile("com2",
              GENERIC_READ | GENERIC_WRITE,
  0,
  NULL,
                      OPEN_EXISTING,
  0,
                      //FILE_FLAG_OVERLAPPED,
  NULL);
     printf("comm2 handl is %d \n",hCom);
   GetCommState(hCom, &dcb ) ; 
   dcb.BaudRate =4800; 
   dcb.ByteSize =8;
 // dcb.Parity = SPACEPARITY;
   dcb.Parity = MARKPARITY;//   送地址
   dcb.fBinary = TRUE ;
   dcb.fParity = TRUE;
   SetCommState(hCom, &dcb ) ; //串口参数配置
   strcpy(data,"send address");
   WriteFile(hCom,data,strlen(data),&len,0);
。
    dcb.Parity = SPACEPARITY;//  关数据
    SetCommState(hCom, &dcb ) ; //串口参数配置   strcpy(data,"send normal data");
   WriteFile(hCom,data,strlen(data),&len,0);

Answer 7

chenhq(chenhq) 再请问一下 ，我那个地址，如果按协议里，是第9位还要为1，那我那个云台不就变成0x101了？放不进byte里了？

Answer 8

不是，第9位是放在SFR中，放在另外的寄存器里，不是放在数据PBUF里

Answer 9

不是，第9位是放在SFR中，放在另外的寄存器里，**是放在数据PBUF里

Answer 10

feng_sky(海峰) 你的意思是不是，如果发地址，奇偶校验为
   dcb.Parity = MARKPARITY;//   送地址
送数据为 // dcb.Parity =    SPACEPARITY;
那我得分两次发送了？

Answer 11

feng_sky奇偶校验就是选上面这两种吧？还有一个小问题，我的串口还用来接收数据，比如会从串口传来S11E的字符串，原来我的奇偶校验是N,现在改成这样以后，如果再有字符串传来，在MARKPARITY、SPACEPARITY下会受到影响吗？

Answer 12

数据可以收到。
用
ClearCommError(hComm1,&error_code,NULL);
可能得到校验的错误。

Answer 13

// dcb.Parity =    SPACEPARITY;
//dcb.Parity = MARKPARITY;//   送地址
上面分别为0校验和1校验。
与数据的1奇偶无关系。