如何使用 c++ 检测 Linux 中串口上的缓冲区溢出

发布于 2024-09-08 06:34:18 字数 491 浏览 7 评论 0原文

我有一个大问题。目前我正在通过以下钩子访问串行端口：

fd = open( "/dev/ttyS1", O_RDWR | O_NOCTTY )

然后我使用以下代码块从中读取内容，

i = select( fd + 1, &rfds, NULL, NULL, &tv )
...
iLen = read( fd, buf, MAX_PACKET_LEN )

问题是在读取之前，我需要检测是否存在任何缓冲区溢出。串行端口级别和内部 tty 翻转缓冲区。

我们尝试了 cat /proc/tty/driver/serial 但它似乎没有列出溢出（请参见下面的输出）

1: uart:16550A port:000002F8 irq:3 tx:70774 rx:862484 fe:44443 pe:270023 brk:30301 RTS|CTS|DTR

原文

I have a big problem. At present I am accessing a serial port via the following hooks:

fd = open( "/dev/ttyS1", O_RDWR | O_NOCTTY )

then I read from it using the following chunk of code

i = select( fd + 1, &rfds, NULL, NULL, &tv )
...
iLen = read( fd, buf, MAX_PACKET_LEN )

the problem is that before I read, I need to detect if there were any buffer overruns. Both at the serial port level and the internal tty flip buffers.

We tried cat /proc/tty/driver/serial but it doesn't seem to list the overruns (see output below)

1: uart:16550A port:000002F8 irq:3 tx:70774 rx:862484 fe:44443 pe:270023 brk:30301 RTS|CTS|DTR

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快乐很简单 2024-09-15 06:34:18

根据内核源代码，您应该使用 TIOCGICOUNT ioctl。第三个 ioctl 参数应该是指向以下结构的指针，在中定义：

/*
 * Serial input interrupt line counters -- external structure
 * Four lines can interrupt: CTS, DSR, RI, DCD
 */
struct serial_icounter_struct {
        int cts, dsr, rng, dcd;
        int rx, tx;
        int frame, overrun, parity, brk;
        int buf_overrun;
        int reserved[9];
};

但是我不知道是否每个驱动程序都检测到所有条件。

According to the kernel sources, you should use the TIOCGICOUNT ioctl. The third ioctl argument should be a pointer to the following struct, defined in <linux/serial.h> :

/*
 * Serial input interrupt line counters -- external structure
 * Four lines can interrupt: CTS, DSR, RI, DCD
 */
struct serial_icounter_struct {
        int cts, dsr, rng, dcd;
        int rx, tx;
        int frame, overrun, parity, brk;
        int buf_overrun;
        int reserved[9];
};

I don't know if every driver detect all conditions however.

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