我正在尝试与通过USB转串口线制作的同事通信。 当我使用teraterm或putty时，它工作正常，但是当我使用示例代码执行时，我无法使其工作。
因为我不知道怎么做 - 或者至少在几年前我做到了最后 - 我正在使用github的一段代码：Seerial Programming with Win32API
我知道如果我发送命令：SB50G，LED应该亮起。但事实并非如此。所以我试着看看，如果它发回一个错误（它应该发送'E'字符，以防任何错误）。虽然没有收到。然后我尝试发送命令'G'，它应该返回一个8个十六进制的ASCII字符串。
打开端口时没有任何错误，除非我同时在teraterm中使用它。
代码是发送器和接收示例的合并：
#include <Windows.h>
#include <stdio.h>
#include <string.h>
void main(void)
{
HANDLE hComm; // Handle to the Serial port
char ComPortName[] = "\\\\.\\COM3"; // Name of the Serial port(May Change) to be opened,
BOOL Status; // Status of the various operations
DWORD dwEventMask; // Event mask to trigger
char TempChar; // Temperory Character
char SerialBuffer[256]; // Buffer Containing Rxed Data
DWORD NoBytesRead; // Bytes read by ReadFile()
int i = 0;
printf("\n\n +==========================================+");
printf("\n | Serial Transmission (Win32 API) |");
printf("\n +==========================================+\n");
/*----------------------------------- Opening the Serial Port --------------------------------------------*/
hComm = CreateFile(ComPortName, // Name of the Port to be Opened
GENERIC_READ | GENERIC_WRITE, // Read/Write Access
0, // No Sharing, ports cant be shared
NULL, // No Security
OPEN_EXISTING, // Open existing port only
0, // Non Overlapped I/O
NULL); // Null for Comm Devices
if (hComm == INVALID_HANDLE_VALUE)
printf("\n Error! - Port %s can't be opened", ComPortName);
else
printf("\n Port %s Opened\n ", ComPortName);
/*------------------------------- Setting the Parameters for the SerialPort ------------------------------*/
DCB dcbSerialParams = { 0 }; // Initializing DCB structure
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
Status = GetCommState(hComm, &dcbSerialParams); //retreives the current settings
if (Status == FALSE)
printf("\n Error! in GetCommState()");
dcbSerialParams.BaudRate = CBR_19200; // Setting BaudRate = 9600
dcbSerialParams.ByteSize = 8; // Setting ByteSize = 8
dcbSerialParams.StopBits = ONESTOPBIT; // Setting StopBits = 1
dcbSerialParams.Parity = NOPARITY; // Setting Parity = None
Status = SetCommState(hComm, &dcbSerialParams); //Configuring the port according to settings in DCB
if (Status == FALSE)
{
printf("\n Error! in Setting DCB Structure");
}
else
{
printf("\n Setting DCB Structure Successfull\n");
printf("\n Baudrate = %d", dcbSerialParams.BaudRate);
printf("\n ByteSize = %d", dcbSerialParams.ByteSize);
printf("\n StopBits = %d", dcbSerialParams.StopBits);
printf("\n Parity = %d", dcbSerialParams.Parity);
}
Status = SetCommMask(hComm, EV_RXCHAR); //Configure Windows to Monitor the serial device for Character Reception
if (Status == FALSE)
printf("\n\n Error! in Setting CommMask");
else
printf("\n\n Setting CommMask successfull");
/*------------------------------------ Setting Timeouts --------------------------------------------------*/
COMMTIMEOUTS timeouts = { 0 };
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if (SetCommTimeouts(hComm, &timeouts) == FALSE)
printf("\n Error! in Setting Time Outs");
else
printf("\n\n Setting Serial Port Timeouts Successfull");
/*----------------------------- Writing a Character to Serial Port----------------------------------------*/
char lpBuffer[] = "G\r"; // lpBuffer should be char or byte array, otherwise write wil fail
DWORD dNoOFBytestoWrite; // No of bytes to write into the port
DWORD dNoOfBytesWritten = 0; // No of bytes written to the port
dNoOFBytestoWrite = sizeof(lpBuffer); // Calculating the no of bytes to write into the port
Status = WriteFile(hComm, // Handle to the Serialport
lpBuffer, // Data to be written to the port
dNoOFBytestoWrite, // No of bytes to write into the port
&dNoOfBytesWritten, // No of bytes written to the port
NULL);
if (Status == TRUE)
printf("\n\n %s - Written to %s", lpBuffer, ComPortName);
else
printf("\n\n Error %d in Writing to Serial Port", GetLastError());
/*------------------------------------ Setting WaitComm() Event ----------------------------------------*/
printf("\n\n Waiting for Data Reception");
Status = WaitCommEvent(hComm, &dwEventMask, NULL); //Wait for the character to be received
/*-------------------------- Program will Wait here till a Character is received ------------------------*/
if (Status == FALSE)
{
printf("\n Error! in Setting WaitCommEvent()");
}
else //If WaitCommEvent()==True Read the RXed data using ReadFile();
{
printf("\n\n Characters Received");
do
{
Status = ReadFile(hComm, &TempChar, sizeof(TempChar), &NoBytesRead, NULL);
SerialBuffer[i] = TempChar;
i++;
} while (NoBytesRead > 0);
/*------------Printing the RXed String to Console----------------------*/
printf("\n\n ");
int j = 0;
for (j = 0; j < i - 1; j++) // j < i-1 to remove the dupliated last character
printf("%c", SerialBuffer[j]);
}
CloseHandle(hComm);//Closing the Serial Port
printf("\n +==========================================+\n");
}
有人可以向我解释为什么它不起作用，或者我能找出它为什么不起作用的任何方式？ BAUD率和它们应该是这样的。
最好的问候。
答案 0 :(得分：0)
这个问题似乎是由董事会决定的。安装嗅探器后，我可以看到正在发送的数据，但是没有返回。 显然，回车需要从数据中分离出来，然后就可以了。
非常感谢您的评论，我会认真考虑他们。 ：）