自己动手编写串口动态库(超详细)

自己动手编写串口动态库手把手教你编写串口调试助手，单片机串口程序一、串口库源码: 自行在vc6中建立动态库工程#include stdafx.h#include #include #include #include #includeresource.h/*导出函数*/函数参数：串口名:com1 波特率：9600 用于显示接收数据的文本框的句柄extern C _declspec(dllexport) void Entry(char *comname, int BaudRate, HWND rhbox);extern C _declspec(dllexport) bool openport(char *portname);extern C _declspec(dllexport) bool setupdcb(int rate_arg);extern C _declspec(dllexport) void SetTimeOut(int a, int b, int c, int d, int e);/发送字符或16进制数extern C _declspec(dllexport) void SendChar(unsigned char ch);/显示方式：1：hex 0：charextern C _declspec(dllexport) void DisplayHex(int flag);extern C _declspec(dllexport) void Close();/只使用上面有注释的三个函数即可HANDLE hComm;/串口的句柄OVERLAPPED m_ov;/是一个包含了用于异步输入输出的信息的结构体COMSTAT comstat;/包含串口结构信息HANDLE hThread1; /读线程句柄HANDLE hThread2; /写线程句柄HWND hRbox;bool sendflag = false;unsigned char sendchar, receivechar;bool DisplayHEX = false;ProcessErrorMessage(char* ErrorText)/打印进程错误信息char *Temp = new char200;LPVOID lpMsgBuf;FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,NULL,GetLastError(),MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), / Default language(LPTSTR)&lpMsgBuf,0,NULL);sprintf(Temp, WARNING: %s Failed with the following error: n%snPort: %dn, (char*)ErrorText, lpMsgBuf, com2);MessageBox(NULL, Temp, Application Error, MB_ICONSTOP);LocalFree(lpMsgBuf);delete Temp;return true;/*打开串口*/bool openport(char *portname)hComm = CreateFile(portname,GENERIC_READ | GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,0);if (hComm = INVALID_HANDLE_VALUE)return FALSE;elsereturn true;/*设备控制块的设置*/参数 波特率rate_arg： 9600bool setupdcb(int rate_arg)DCB dcb;int rate = rate_arg;memset(&dcb, 0, sizeof(dcb); /申请一个DCB结构体空间if (!GetCommState(hComm, &dcb)/获取当前DCB配置ProcessErrorMessage(GetCommState();/打印错误信息return FALSE;/* - */ 配置当前串口dcb.DCBlength = sizeof(dcb);/* -串口的配置 - */dcb.BaudRate = rate;dcb.Parity = NOPARITY;dcb.fParity = 0;dcb.StopBits = ONESTOPBIT;dcb.ByteSize = 8;dcb.fOutxCtsFlow = 0;dcb.fOutxDsrFlow = 0;dcb.fDtrControl = DTR_CONTROL_DISABLE;dcb.fDsrSensitivity = 0;dcb.fRtsControl = RTS_CONTROL_DISABLE;dcb.fOutX = 0;dcb.fInX = 0;/* -其他参数的设置 - */dcb.fErrorChar = 0;dcb.fBinary = 1;dcb.fNull = 0;dcb.fAbortOnError = 0;dcb.wReserved = 0;dcb.XonLim = 2;dcb.XoffLim = 4;dcb.XonChar = 0x13;dcb.XoffChar = 0x19;dcb.EvtChar = 0;/* - */ 用上面的设备控制块来设置当前串口if (!SetCommState(hComm, &dcb)ProcessErrorMessage(SetCommState();return false;elsereturn true;/设置成功/*超时的设置*/bool setuptimeout(int ReadInterval, int ReadTotalMultiplier, int ReadTotalconstant, int WriteTotalMultiplier, int WriteTotalconstant)COMMTIMEOUTS timeouts;timeouts.ReadIntervalTimeout = ReadInterval;/ 读间隔超时timeouts.ReadTotalTimeoutConstant = ReadTotalconstant;/ 读时间常量timeouts.ReadTotalTimeoutMultiplier = ReadTotalMultiplier;/ 读时间系数timeouts.WriteTotalTimeoutConstant = WriteTotalconstant;/ 写时间常量timeouts.WriteTotalTimeoutMultiplier = WriteTotalMultiplier;/ 写时间系数if (!SetCommTimeouts(hComm, &timeouts)/设置当前串口的超时设置ProcessErrorMessage(SetCommTimeouts();return false;elsereturn true;void ReceiveChar()BOOL bRead = TRUE;BOOL bResult = TRUE;DWORD dwError = 0;DWORD BytesRead = 0;char RXBuff;/接收数据缓冲器char str10;for (;)/死循环等待Sleep(100);bResult = ClearCommError(hComm, &dwError, &comstat);/清除硬件的通讯错误以及获取通讯设备的当前状态if (comstat.cbInQue = 0)continue;if (bRead)bResult = ReadFile(hComm, / Handle to COMM port&RXBuff, / RX Buffer Pointer1, / Read one byte&BytesRead, / Stores number of bytes read&m_ov); / pointer to the m_ov structureif (DisplayHEX)/printf(0x%08x , RXBuff);/打印接收到的数据sprintf(str, 0x%08x , RXBuff);SetWindowText(hRbox, str);else/printf(%c, RXBuff);/打印接收到的数据sprintf(str, %c, RXBuff);SetWindowText(hRbox, str);if (!bResult)/读不成功switch (dwError = GetLastError()case ERROR_IO_PENDING: bRead = FALSE; break;default: break;elsebRead = TRUE; / close if (bRead)if (!bRead)bRead = TRUE;bResult = GetOverlappedResult(hComm, / Handle to COMM port&m_ov, / Overlapped structure&BytesRead, / Stores number of bytes readTRUE); / Wait flagWriteChar(BYTE* m_szWriteBuffer, DWORD m_nToSend)BOOL bWrite = TRUE;BOOL bResult = TRUE;DWORD BytesSent = 0;HANDLE m_hWriteEvent;ResetEvent(m_hWriteEvent);if (bWrite)m_ov.Offset = 0;m_ov.OffsetHigh = 0;/ Clear bufferbResult = WriteFile(hComm, / Handle to COMM Portm_szWriteBuffer, / Pointer to message buffer in calling finctionm_nToSend, / Length of message to send&BytesSent, / Where to store the number of bytes sent&m_ov); / Overlapped structureif (!bResult)DWORD dwError = GetLastError();switch (dwError)case ERROR_IO_PENDING: / continue to GetOverlappedResults() BytesSent = 0; bWrite = FALSE; break;default: / all other error codes ProcessErrorMessage(WriteFile(); / end if(bWrite)if (!bWrite)bWrite = TRUE;bResult = GetOverlappedResult(hComm, / Handle to COMM port&m_ov, / Overlapped structure&BytesSent, / Stores number of bytes sentTRUE); / Wait flag/ deal with the error codeif (!bResult)ProcessErrorMessage(GetOverlappedResults() in WriteFile(); / end if (!bWrite)/ Verify that the data size send equals what we tried to sendif (BytesSent != m_nToSend)printf(WARNING: WriteFile() error. Bytes Sent: %d; Message Length: %dn, BytesSent, strlen(char*)m_szWriteBuffer);return true;/读线程DWORD WINAPI MyThread1(LPVOID pParam)ReceiveChar();return 0;/写线程DWORD WINAPI MyThread2(LPVOID pParam)while (hComm != INVALID_HANDLE_VALUE) / 串口已被成功打开Sleep(100);/等待100毫秒if (sendflag)WriteChar(&sendchar, 1);sendflag = false;/发送return 0;/*函数名Entry参数comname:串口名BaudRate:波特率*/void Entry(char *comname, int BaudRate, HWND rhbox)hRbox = rhbox;if (openport(comname)printf(open comport successn);if (setupdcb(BaudRate)printf(setupDCB successn);if (setuptimeout(0, 0, 0, 0, 0)printf(setuptimeout successn);/清空缓冲区 PurgeComm(hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);hThread1 = CreateThread(NULL, 0, MyThread1, 0, 0, NULL); /读线程hThread2 = CreateThread(NULL, 0, MyThread2, 0, 0, NULL); /写线程/*设置显示*/void DisplayHex(int flag)if (flag = 0)DisplayHEX = false;elseDisplayHEX = true;/*设置超时*/void SetTimeOut(int a, int b, int c, int d, int e)if (setuptimeout(a, b, c, d, e)printf(setuptimeout successn);/*发送数据*/void SendChar(unsigned char ch)sendchar = ch;sendflag = true;/通知发送线程发送数据/*关闭*/void Close()CloseHandle(hThread1);/关闭都线程CloseHandle(hThread2);/关闭写线程CloseHandle(hComm);/关闭串口二、验证是否成功把DLL放在EXE一起三、验证串口库代码：#pragma comment(lib,libserialport.lib)extern C_declspec(dllimport)void Entry(char *comname, int BaudRate, NULL);extern C_declspec(dllimport) void SendChar(unsigned char ch);extern C_declspec(dllimport) void Close();extern C_declspec(dllimport) void DisplayHex(int flag);#include#includeint main()char ch;Entry(com4, 9600, NULL);/根据需要设置串口号DisplayHex(0);Sleep(2000);SendChar(A);/测试字符Sleep(2000);SendChar(B);Sleep(2000);DisplayHex(1);SendChar(0x00);Sleep(2000);SendChar(0xf3);/测试16进制数Sleep(2000);SendChar(0xff);Sleep(2000);Close();/关闭串口return 0;四、(可选)编写窗口程序可以看出不用MFC编写的串口程序体积非常小五、单片机上的程序#include#define jingzhen UL#define botelv 9600UL/定义波特率为9600volatile unsigned char sending, r