在AT指令中,转义字符是“\r\n”。它被用于表示回车和换行,以结束每条AT指令的命令行。
以下是一个包含代码示例的解决方法,演示了如何在串口通信中发送AT指令,并使用转义字符进行换行:
#include
#include
int main() {
HANDLE hSerial;
DCB dcbSerialParams = { 0 };
COMMTIMEOUTS timeouts = { 0 };
// 打开串口
hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hSerial == INVALID_HANDLE_VALUE) {
std::cout << "无法打开串口!" << std::endl;
return 1;
}
// 配置串口参数
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
if (!GetCommState(hSerial, &dcbSerialParams)) {
std::cout << "无法获取串口参数!" << std::endl;
CloseHandle(hSerial);
return 1;
}
dcbSerialParams.BaudRate = CBR_9600;
dcbSerialParams.ByteSize = 8;
dcbSerialParams.StopBits = ONESTOPBIT;
dcbSerialParams.Parity = NOPARITY;
if (!SetCommState(hSerial, &dcbSerialParams)) {
std::cout << "无法配置串口参数!" << std::endl;
CloseHandle(hSerial);
return 1;
}
// 配置串口超时
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if (!SetCommTimeouts(hSerial, &timeouts)) {
std::cout << "无法配置串口超时!" << std::endl;
CloseHandle(hSerial);
return 1;
}
// 发送AT指令
std::string atCommand = "AT+CGSN\r\n";
DWORD bytesWritten;
if (!WriteFile(hSerial, atCommand.c_str(), atCommand.size(), &bytesWritten, NULL)) {
std::cout << "无法发送AT指令!" << std::endl;
CloseHandle(hSerial);
return 1;
}
// 读取响应
char buffer[100];
DWORD bytesRead;
if (!ReadFile(hSerial, buffer, sizeof(buffer), &bytesRead, NULL)) {
std::cout << "无法读取串口数据!" << std::endl;
CloseHandle(hSerial);
return 1;
}
// 输出响应
std::cout << "串口响应:" << std::string(buffer, bytesRead) << std::endl;
// 关闭串口
CloseHandle(hSerial);
return 0;
}
上述代码使用Windows API来配置和操作串口。它打开COM1端口,设置波特率为9600,发送"AT+CGSN\r\n"指令,并读取串口的响应。最后输出响应的内容。在这个例子中,"\r\n"被用作AT指令中的转义字符,表示回车和换行。