用PC端控制示波器的C语言代码

以下是一个基于C语言的控制示波器的示例代码，实现了通过串口与示波器进行通信并控制示波器的功能。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

#define BAUDRATE B115200
#define PORT "/dev/ttyUSB0"

void set_interface_attribs(int fd, int speed, int parity)
{
    struct termios tty;
    memset(&tty, 0, sizeof(tty));
    if (tcgetattr(fd, &tty) != 0) {
        printf("error %d from tcgetattr", errno);
        return;
    }

    cfsetospeed(&tty, speed);
    cfsetispeed(&tty, speed);

    tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8;     // 8-bit chars
    tty.c_iflag &= ~IGNBRK;         // disable break processing
    tty.c_lflag = 0;                // no signaling chars, no echo,
                                    // no canonical processing
    tty.c_oflag = 0;                // no remapping, no delays
    tty.c_cc[VMIN]  = 0;            // read doesn't block
    tty.c_cc[VTIME] = 5;            // 0.5 seconds read timeout

    tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl

    tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
                                    // enable reading
    tty.c_cflag &= ~(PARENB | PARODD);      // shut off parity
    tty.c_cflag |= parity;
    tty.c_cflag &= ~CSTOPB;
    tty.c_cflag &= ~CRTSCTS;

    if (tcsetattr(fd, TCSANOW, &tty) != 0)
        printf("error %d from tcsetattr", errno);
}

void set_blocking(int fd, int should_block)
{
    struct termios tty;
    memset(&tty, 0, sizeof(tty));
    if (tcgetattr(fd, &tty) != 0) {
        printf("error %d from tggetattr", errno);
        return;
    }

    tty.c_cc[VMIN]  = should_block ? 1 : 0;
    tty.c_cc[VTIME] = 5;            // 0.5 seconds read timeout

    if (tcsetattr(fd, TCSANOW, &tty) != 0)
        printf("error %d setting term attributes", errno);
}

int main()
{
    int fd = open(PORT, O_RDWR | O_NOCTTY | O_SYNC);
    if (fd < 0) {
        printf("error %d opening %s: %s", errno, PORT, strerror(errno));
        return 1;
    }

    set_interface_attribs(fd, BAUDRATE, 0);  // set speed to 115,200 bps, 8n1 (no parity)
    set_blocking(fd, 0);                // set no blocking

    char cmd[] = ":CHANNEL1:DISPLAY ON\n"; // turn on channel 1 display
    write(fd, cmd, sizeof(cmd));          // send command to the oscilloscope

    usleep(100000);                       // wait for command to be processed

    close(fd);                            // close the serial port

    return 0;
}

以上代码仅为示例，具体的指令格式和串口通信协议需要参考示波器的操作手册。在实际应用中，还需要添加错误处理和异常情况的处理代码，以保证程序的稳定性和可靠性。