串口超时参数深度解析：ReadTotalTimeoutMultiplier、ReadIntervalTimeout等

if (当前字符间隔 > ReadIntervalTimeout) → 触发间隔超时
OR
if (操作总时间 > (ReadTotalTimeoutMultiplier × 字节数 + ReadTotalTimeoutConstant)) → 触发总超时

COMMTIMEOUTS timeouts = {0};
timeouts.ReadIntervalTimeout = 10;         // 短间隔超时，快速响应
timeouts.ReadTotalTimeoutConstant = 20;    // 固定超时20ms
timeouts.ReadTotalTimeoutMultiplier = 0;   // 不使用每字节乘数
SetCommTimeouts(hSerial, &timeouts);

COMMTIMEOUTS timeouts = {0};
timeouts.ReadIntervalTimeout = MAXDWORD;   // 特殊配置
timeouts.ReadTotalTimeoutMultiplier = 0;
timeouts.ReadTotalTimeoutConstant = 0;     // 立即返回缓冲区内容
SetCommTimeouts(hSerial, &timeouts);

COMMTIMEOUTS timeouts = {0};
timeouts.ReadIntervalTimeout = 100;        // 较长间隔超时
timeouts.ReadTotalTimeoutMultiplier = 50;  // 每字节50ms
timeouts.ReadTotalTimeoutConstant = 1000;  // 固定超时1秒
// 总超时 = 50ms×n + 1000ms
SetCommTimeouts(hSerial, &timeouts);

COMMTIMEOUTS timeouts = {0};
timeouts.ReadIntervalTimeout = 1;          // 最小间隔超时
timeouts.ReadTotalTimeoutConstant = 100;   // 短固定超时
timeouts.ReadTotalTimeoutMultiplier = 0;
SetCommTimeouts(hSerial, &timeouts);

// 初始化超时结构体
COMMTIMEOUTS timeouts = {0};

// 设置参数
timeouts.ReadIntervalTimeout = 10;
timeouts.ReadTotalTimeoutMultiplier = 0;
timeouts.ReadTotalTimeoutConstant = 20;
timeouts.WriteTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 100;

// 应用配置
if (!SetCommTimeouts(hSerial, &timeouts)) {
    // 错误处理
    DWORD error = GetLastError();
    printf("设置超时失败，错误码: %d\n", error);
}

DWORD bytesRead;
char buffer[1024];
BOOL success = ReadFile(hSerial, buffer, sizeof(buffer), &bytesRead, NULL);

if (!success && GetLastError() == ERROR_TIMEOUT) {
    printf("读取超时，已接收 %d 字节\n", bytesRead);
    // 处理部分接收的数据
} else if (success) {
    printf("成功接收 %d 字节\n", bytesRead);
    // 处理完整数据
}