嘿,我正试图与我连接到我的Windows机器的xbees接口。我可以通过协调器以AT模式写入终端设备,并可以看到流式传输到我的XCTU控制台的数据。但是,我无法理解如何读取传入数据。从串口读取字节C++ Windows
我目前使用的代码如下。基本上唯一重要的部分是最后5行左右(具体来说就是读写文件行),但我会将其全部公布,以便彻底。我如何读取通过com端口发送给xbee的数据?我发送的数据只是0x00-0x0F。
我想我误解了读取文件的功能。我假设我发送给xbee的位存储在一个缓冲区中,而不是一次读取一个缓冲区。那是对的吗?或者我需要写入整个字节而不是读取可用的数据?对不起,如果我的列车虽然令人困惑,但我对串行通信相当陌生。任何帮助表示赞赏。
#include <cstdlib>
#include <windows.h>
#include <iostream>
using namespace std;
/*
*
*/
int main(int argc, char** argv) {
int n = 8; // Amount of Bytes to Read
HANDLE hSerial;
HANDLE hSerial2;
hSerial = CreateFile("COM3",GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);// dont need to GENERIC _ WRITE
hSerial2 = CreateFile("COM4",GENERIC_READ,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);// dont need to GENERIC _ WRITE
if(hSerial==INVALID_HANDLE_VALUE || hSerial2==INVALID_HANDLE_VALUE){
if(GetLastError()==ERROR_FILE_NOT_FOUND){
//serial port does not exist. Inform user.
cout << "Serial port error, does not exist" << endl;
}
//some other error occurred. Inform user.
cout << "Serial port probably in use" << endl;
}
DCB dcbSerialParams = {0};
dcbSerialParams.DCBlength=sizeof(dcbSerialParams);
if (!GetCommState(hSerial, &dcbSerialParams)) {
cout << "error getting state" << endl;
}
dcbSerialParams.BaudRate=CBR_9600;
dcbSerialParams.ByteSize=8;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=NOPARITY;
if(!SetCommState(hSerial, &dcbSerialParams)){
cout << "error setting serial port state" << endl;
}
COMMTIMEOUTS timeouts = {0};
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier =10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if (!SetCommTimeouts(hSerial, &timeouts)){
cout << "Error occurred" << endl;
}
DWORD dwBytesWritten = 0;
DWORD dwBytesRead = 0;
unsigned char oneChar;
for (int i=0; i<16; i++)
{
oneChar=0x00+i;
WriteFile(hSerial, (LPCVOID)&oneChar, 1, &dwBytesWritten, NULL);
ReadFile (hSerial2, &oneChar, 1, &dwBytesRead, NULL); // what I tried to do, just outputs white space
}
CloseHandle(hSerial);
return 0;
}