win32 ver
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xinyang
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#include <serial/serial.h>
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#include <options/options.h>
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#include <log.h>
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using namespace std;
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#include <iostream>
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Serial::Serial(UINT portNo, UINT baud, char parity, UINT databits, UINT stopsbits, DWORD dwCommEvents) :
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hComm(INVALID_HANDLE_VALUE),
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portNo(portNo),
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parity(parity),
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databits(databits),
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stopsbits(stopsbits),
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dwCommEvents(dwCommEvents){
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if (wait_uart) {
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LOGM("Waiting for serial COM%d", portNo);
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while (InitPort(portNo, baud, parity, databits, stopsbits, dwCommEvents) == false);
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LOGM("Port COM%d open success!", portNo);
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} else {
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if (InitPort(portNo, baud, parity, databits, stopsbits, dwCommEvents)) {
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LOGM("Port COM%d open success!", portNo);
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} else {
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LOGE("Port COM%d open fail!", portNo);
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}
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}
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}
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Serial::~Serial() {
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ClosePort();
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}
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void Serial::ErrorHandler() {
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if (wait_uart) {
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LOGE("Serial COM%d offline, waiting for serial COM%d", portNo, portNo);
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while (InitPort(portNo, baud, parity, databits, stopsbits, dwCommEvents) == false);
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LOGM("Port COM%d reopen success!", portNo);
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}
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}
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bool Serial::openPort(UINT portNo) {
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char szPort[50];
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sprintf_s(szPort, "COM%d", portNo);
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/** 打开指定的串口 */
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hComm = CreateFileA(szPort, /** 设备名,COM1,COM2等 */
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GENERIC_READ | GENERIC_WRITE, /** 访问模式,可同时读写 */
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0, /** 共享模式,0表示不共享 */
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NULL, /** 安全性设置,一般使用NULL */
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OPEN_EXISTING, /** 该参数表示设备必须存在,否则创建失败 */
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0,
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0);
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return hComm != INVALID_HANDLE_VALUE;
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}
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void Serial::ClosePort() {
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/** 如果有串口被打开，关闭它 */
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if (hComm != INVALID_HANDLE_VALUE) {
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CloseHandle(hComm);
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hComm = INVALID_HANDLE_VALUE;
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}
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}
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bool Serial::InitPort(UINT portNo, UINT baud, char parity, UINT databits, UINT stopsbits, DWORD dwCommEvents) {
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/** 临时变量,将制定参数转化为字符串形式,以构造DCB结构 */
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char szDCBparam[50];
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sprintf_s(szDCBparam, "baud=%d parity=%c data=%d stop=%d", baud, parity, databits, stopsbits);
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if (!openPort(portNo)){
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cout << "open error!" << endl;
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return false;
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}
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BOOL bIsSuccess = TRUE;
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COMMTIMEOUTS CommTimeouts;
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CommTimeouts.ReadIntervalTimeout = 0;
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CommTimeouts.ReadTotalTimeoutMultiplier = 0;
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CommTimeouts.ReadTotalTimeoutConstant = 0;
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CommTimeouts.WriteTotalTimeoutMultiplier = 0;
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CommTimeouts.WriteTotalTimeoutConstant = 0;
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if (bIsSuccess) {
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bIsSuccess = SetCommTimeouts(hComm, &CommTimeouts);
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} else {
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cout << "SetCommTimeouts error!" << endl;
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}
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DCB dcb;
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if (bIsSuccess) {
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/** 获取当前串口配置参数,并且构造串口DCB参数 */
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bIsSuccess = GetCommState(hComm, &dcb);
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bIsSuccess = BuildCommDCB(szDCBparam, &dcb);
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if (!bIsSuccess) {
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cout << "Create dcb fail with "<< GetLastError() << endl;
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}
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/** 开启RTS flow控制 */
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dcb.fRtsControl = RTS_CONTROL_ENABLE;
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}
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if (bIsSuccess) {
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/** 使用DCB参数配置串口状态 */
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bIsSuccess = SetCommState(hComm, &dcb);
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if (!bIsSuccess) {
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cout << "SetCommState error!" << endl;
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}
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}
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/** 清空串口缓冲区 */
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PurgeComm(hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
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return bIsSuccess;
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}
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UINT Serial::GetBytesInCOM() const {
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DWORD dwError = 0; /** 错误码 */
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COMSTAT comstat; /** COMSTAT结构体,记录通信设备的状态信息 */
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memset(&comstat, 0, sizeof(COMSTAT));
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UINT BytesInQue = 0;
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/** 在调用ReadFile和WriteFile之前,通过本函数清除以前遗留的错误标志 */
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if (ClearCommError(hComm, &dwError, &comstat)) {
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BytesInQue = comstat.cbInQue; /** 获取在输入缓冲区中的字节数 */
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}
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return BytesInQue;
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}
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bool Serial::WriteData(const unsigned char* pData, unsigned int length) {
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if (hComm == INVALID_HANDLE_VALUE) {
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ErrorHandler();
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return false;
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}
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/** 向缓冲区写入指定量的数据 */
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BOOL bResult = TRUE;
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DWORD BytesToSend = 0;
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bResult = WriteFile(hComm, pData, length, &BytesToSend, NULL);
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if (!bResult) {
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DWORD dwError = GetLastError();
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/** 清空串口缓冲区 */
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PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT);
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ErrorHandler();
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return false;
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}
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return true;
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}
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bool Serial::ReadData(unsigned char *buffer, unsigned int length) {
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if (hComm == INVALID_HANDLE_VALUE) {
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ErrorHandler();
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return false;
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}
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/** 从缓冲区读取length字节的数据 */
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BOOL bResult = TRUE;
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DWORD totalRead = 0, onceRead = 0;
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while (totalRead < length) {
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bResult = ReadFile(hComm, buffer, length-totalRead, &onceRead, NULL);
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totalRead += onceRead;
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if ((!bResult)) {
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/** 获取错误码,可以根据该错误码查出错误原因 */
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DWORD dwError = GetLastError();
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/** 清空串口缓冲区 */
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PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT);
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ErrorHandler();
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return false;
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}
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}
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return bResult;
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}
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