Device 从/dev/input获取实时信息

我不确定这是否是这个问题的正确位置。我试图从系统上的操纵杆

/dev/input/js0

获取轴位置值。如果我运行

jstest/dev/input/js0

，它将给我所有按钮和轴位置的实时反馈

我试图把这些信息输入我的C程序来控制伺服系统。有这样做的功能吗？我没有在编程中使用过很多输入设备，所以这对我来说是全新的

这个页面：有一篇关于如何从/dev/input/js0读取信息的好文章

从文件中读取的事件格式记录在此处：。它是一个简单的结构，包含时间戳、事件类型和标识符以及值：

struct input_event {
    struct timeval time;
    unsigned short type;
    unsigned short code;
    unsigned int value;
};

您可以运行此命令来读取事件。
您还可以使用高级模块

样本输出：

(73324490, 8454144, 55242, 1118, 25231360)
(73324490, 42008576, 55242, 1118, 58785792)
(73324490, 75563008, 55242, 1118, 92340224)
(73324490, 109117440, 55242, 1118, 125894656)
(73324490, 142671872, 55242, 1118, 159449088)
(73324490, 176226304, 55242, 1118, 193003520)
(73324490, 209780736, 55242, 1118, 226557952)
(73324490, 243335168, 55242, 1118, 8519680)
(73324490, 25296896, 55242, 1118, 42074112)
(73324490, 58884097, 55242, 1118, 75661313)
(73324490, 92405760, 55242, 1118, 109215745)
(73324490, 125992961, 55242, 1118, 142737408)
(73324490, 159514624, 55242, 1118, 176324609)
(73327790, 84041474, 58542, 1118, 84049919)
(73328030, 84044852, 58782, 1118, 84017152)
(73331790, 33749013, 62542, 1118, 33742256)
(73331790, 33736851, 62562, 1118, 33731108)
(73331830, 33723339, 62602, 1118, 33718273)
(73332090, 33723339, 62862, 1118, 33685504)

---

建在kev的柱子上

从linux/mogage.h文件：

struct js_event {
    __u32 time;     /* event timestamp in milliseconds */
    __s16 value;    /* value */
    __u8 type;      /* event type */
    __u8 number;    /* axis/button number */
};

所以答案应该是：“LhBB”

XBOX One S控制器的输出示例：

// type=button, number=button number
//msec, value, type, number
(2114530, 1, 1, 0) // A pressed
(2114670, 0, 1, 0) // A released
(2116490, 1, 1, 1) // B pressed
(2116620, 0, 1, 1) // B released
(2117370, 1, 1, 2) // X pressed
(2117520, 0, 1, 2) // X released
(2118220, 1, 1, 3) // Y pressed
(2118360, 0, 1, 3) // Y released

infile_path = "/dev/input/js0"
EVENT_SIZE = struct.calcsize("LhBB")
file = open(infile_path, "rb")
event = file.read(EVENT_SIZE)
while event:
    print(struct.unpack("LhBB", event))
    (tv_msec,  value, type, number) = struct.unpack("LhBB", event)
    event = file.read(EVENT_SIZE)

// type=button, number=button number
//msec, value, type, number
(2114530, 1, 1, 0) // A pressed
(2114670, 0, 1, 0) // A released
(2116490, 1, 1, 1) // B pressed
(2116620, 0, 1, 1) // B released
(2117370, 1, 1, 2) // X pressed
(2117520, 0, 1, 2) // X released
(2118220, 1, 1, 3) // Y pressed
(2118360, 0, 1, 3) // Y released