linux 触摸屏校准

以下是两种Linux触摸屏校准的方法：

1. 使用tslib编写触摸屏校准程序

如果你使用的是嵌入式Linux系统，并且已经安装了QT5.6版本和tslib库，你可以编写一个触摸屏校准程序。以下是一个示例程序：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/input.h>
#include <tslib.h>

#define DEVICE_NAME "/dev/input/event0"
#define CALIBRATION_FILE "/etc/pointercal"

int main(int argc, char *argv[])
{
    struct tsdev *ts;
    struct ts_sample samp[5];
    int fd, i;
    struct ts_sample *calib;
    struct ts_sample *calib_result;
    int xres, yres;

    ts = ts_open(DEVICE_NAME, 0);
    if (!ts) {
        perror("ts_open");
        exit(1);
    }

    if (ts_config(ts)) {
        perror("ts_config");
        exit(1);
    }

    calib = malloc(sizeof(struct ts_sample) * 5);
    calib_result = malloc(sizeof(struct ts_sample) * 5);

    printf("Please touch the screen at the center of the cross.\n");
    for (i = 0; i < 5; i++) {
        ts_read(ts, &samp[i], 1);
        calib[i] = samp[i];
    }

    calib_result[2].x = xres / 2;
    calib_result[2].y = yres / 2;

    printf("Please touch the screen at the top-left corner of the screen.\n");    for (i = 0; i < 5; i++) {
        ts_read(ts, &samp[i], 1);
        calib[i].x = samp[i].x;
        calib[i].y = samp[i].y;
    }

    calib_result[0].x = 0;
    calib_result[0].y = 0;

    printf("Please touch the screen at the bottom-right corner of the screen.\n");
    for (i = 0; i < 5; i++) {
        ts_read(ts, &samp[i], 1);
        calib[i].x = samp[i].x;
        calib[i].y = samp[i].y;
    }

    calib_result[4].x = xres - 1;
    calib_result[4].y = yres - 1;

    printf("Please touch the screen at the top-right corner of the screen.\n");
    for (i = 0; i < 5; i++) {
        ts_read(ts, &samp[i], 1);
        calib[i].x = samp[i].x;
        calib[i].y = samp[i].y;
    }

    calib_result[1].x = xres - 1;
    calib_result[1].y = 0;

    printf("Please touch the screen at the bottom-left corner of the screen.\n");
    for (i = 0; i < 5; i++) {
        ts_read(ts, &samp[i], 1);
        calib[i].x = samp[i].x;
        calib[i].y = samp[i].y;
    }

    calib_result[3].x = 0;
    calib_result[3].y = yres - 1;

    ts_close(ts);

    fd = open(CALIBRATION_FILE, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    if (fd < 0) {
        perror("open");
        exit(1);
    }

    dprintf(fd, "%d %d %d %d %d %d %d %d %d\n",
            calib_result[0].x, calib_result[0].y,
            calib_result[1].x, calib_result[1].y,
            calib_result[2].x, calib_result[2].y,
            calib_result[3].x, calib_result[3].y,
            calib_result[4].x, calib_result[4].y);

    close(fd);

    printf("Calibration data saved to %s.\n", CALIBRATION_FILE);

    return 0;
}

2. 使用xinput_calibrator命令行工具校准触摸设备

如果你使用的是Linux桌面系统，你可以使用xinput_calibrator命令行工具校准触摸设备。以下是一个示例命令：

xinput_calibrator -v --device <device name or id>

其中，`<device name or id>`是你要校准的触摸设备的名称或ID。你可以使用`xinput list`命令查看所有输入设备的列表。