通过串口实现AT指令的发送
我想做一个串口调试工具,通过向GSM MODEM发送AT指令,实现短信的收发
我用的是WAVECOM的短信猫,请高手们帮我看一下串口发送函数设置有没有错误,因为我发送AT指令后收到的是一些乱码
不知道是发送格式错了还是接收有问题
例如我在编辑框输入 AT 后点击发送,返回乱码 A狹
输入AT+IPR=9600 发送,返回 A猭櫎?y柸d慀
发送的指令如果用小写(例如发送at at+ipr=9600)返回的数据也不一样,请指教
是不是writefile()和readfile()函数参数错了,分不够可以加
void CMSGCOMDlg::OnSetport() //设置串口参数
{
SetupComm(hCom, 1024, 1024); //设置发送和接收缓冲区大小
//设置串口信息
DCB dcb;
GetCommState(hCom, &dcb);
dcb.BaudRate = 9600;
dcb.fBinary = TRUE;
dcb.fParity = TRUE;
dcb.ByteSize = 8;
dcb.Parity = ODDPARITY;
dcb.StopBits = ONESTOPBIT;
if(!SetCommState(hCom,&dcb))
{
MessageBox("设置失败", "提示");
return;
}
if(!SetCommMask(hCom, EV_RXCHAR | EV_TXEMPTY))
{
MessageBox("掩码设置失败", "提示");
return;
}
DWORD param;
hThread = CreateThread((LPSECURITY_ATTRIBUTES)NULL, //安全属性
0, //初始化线程栈的大小,缺省为与主线程大小相同
(LPTHREAD_START_ROUTINE)ThreadFunction, //线程的全局函数
¶m, //此处传入了主框架的句柄
0, //创建后立即激活
&dwThreadID); //保存新线程的id
if (hThread == INVALID_HANDLE_VALUE)
{
MessageBox("线程创建失败", "提示");
return;
}
IsFun = TRUE;
}
void CMSGCOMDlg::OnSend() // 发送AT指令
{
DWORD res;
DWORD factdata = 0;
CString str;
m_data.GetWindowText(str); //str接收编辑框输入的AT指令
str += "\r\n";
wOverLaped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); //创建一个事件对象
IsStop = FALSE;
if (WriteFile(hCom, str, str.GetLength(), &factdata, &wOverLaped)) //开始发送数据
{
IsStop = TRUE;
MessageBox("发送成功");
}
else if(GetLastError()==ERROR_IO_PENDING)
{
res = WaitForSingleObject(wOverLaped.hEvent, 2000); //延时2秒,等待数据发送
if (WAIT_OBJECT_0 == res) //如果事件处于有信号状态,表示发送完成
{
IsStop = TRUE;
}
else
IsStop = FALSE;
Sleep(1000); //延时1秒钟
}
}
DWORD ThreadFunction(LPVOID pParam)//线程函数
{
DWORD dwEvtMask ,dwResult;
tOverLaped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);//创建一个事件
while(IsFun)
{
//等待窗口事件
WaitCommEvent(((CMSGCOMDlg*)AfxGetMainWnd())->hCom,
&dwEvtMask, &tOverLaped);
//如果事件没有信号,延时0.1秒
dwResult = WaitForSingleObject(tOverLaped.hEvent, 100);
if(dwResult == WAIT_OBJECT_0) //事件对象有信号
{
if(dwEvtMask == EV_RXCHAR) //接收到数据
{
if(IsStop)//发送停止
{
IsStop = FALSE;
//发送消息,由消息处理函数接收数据
::PostMessage(AfxGetMainWnd()->m_hWnd, CM_RECEIVE,
0,(LPARAM)EV_RXCHAR);
}
}
}
}
return 0;
}
void CMSGCOMDlg::OnRecieveData(WPARAM wParam, LPARAM lParam)//自定义消息处理函数,用于接收消息
{
DWORD res, factbyte;
memset(DataBuffer, 0, 1024); //初始化数据缓冲区
COMSTAT rst;
ClearCommError(hCom, &res, &rst); //清空串口错误标志,记录当前通信状态
rOverLaped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); //创建一个事件对象
if (ReadFile(hCom, DataBuffer, rst.cbInQue, &factbyte, &rOverLaped)) //读取数据到缓冲区中
{
DataBuffer[rst.cbInQue] = 0;
IsStop = FALSE;
}
else
{
res = WaitForSingleObject(rOverLaped.hEvent, 2000);
}
IsStop = FALSE;
CString str = DataBuffer;
m_outwnd += str + "\r\n"; //将收到的数据显示到编辑框控件上
UpdateData(FALSE);
}