使用TX2读取USB手柄/方向盘的输出控制( 二 ) _游戏手柄

1 cat /dev/input/event21 | hexdump
得到一堆16进制的数，当手柄按下时，数字便会变化。

文章插图
测试手柄命令
1jstest /dev/input/js0
可以读取Axes和的变化。
4.代码实现
参照参考3，新建文件夹与cpp文件，实现功能：
cpp文件建立执行参照
1 gedit first.cpp2 g++ first.cpp -o test3 ./test
代码如下：

#include#include #include#include#include#include #include #include #include #define XBOX_TYPE_BUTTON0x01#define XBOX_TYPE_AXIS0x02#define XBOX_BUTTON_A0x00#define XBOX_BUTTON_B0x01#define XBOX_BUTTON_X0x02#define XBOX_BUTTON_Y0x03#define XBOX_BUTTON_LB0x04#define XBOX_BUTTON_RB0x05#define XBOX_BUTTON_START0x06#define XBOX_BUTTON_BACK0x07#define XBOX_BUTTON_HOME0x08#define XBOX_BUTTON_LO0x09/* 左摇杆按键 */#define XBOX_BUTTON_RO0x0a/* 右摇杆按键 */#define XBOX_BUTTON_ON0x01#define XBOX_BUTTON_OFF0x00#define XBOX_AXIS_LX0x00/* 左摇杆X轴 */#define XBOX_AXIS_LY0x01/* 左摇杆Y轴 */#define XBOX_AXIS_RX0x03/* 右摇杆X轴 */#define XBOX_AXIS_RY0x04/* 右摇杆Y轴 */#define XBOX_AXIS_LT0x02#define XBOX_AXIS_RT0x05#define XBOX_AXIS_XX0x06/* 方向键X轴 */#define XBOX_AXIS_YY0x07/* 方向键Y轴 */#define XBOX_AXIS_VAL_UP-32767#define XBOX_AXIS_VAL_DOWN32767#define XBOX_AXIS_VAL_LEFT-32767#define XBOX_AXIS_VAL_RIGHT32767#define XBOX_AXIS_VAL_MIN-32767#define XBOX_AXIS_VAL_MAX32767#define XBOX_AXIS_VAL_MID0x00typedef struct xbox_map{inttime;inta;intb;intx;inty;intlb;intrb;intstart;intback;inthome;intlo;intro;intlx;intly;intrx;intry;intlt;intrt;intxx;intyy;}xbox_map_t;int xbox_open(const char *file_name){int xbox_fd;xbox_fd = open(file_name, O_RDONLY);if (xbox_fd < 0){perror("open");return -1;}return xbox_fd;}int xbox_map_read(int xbox_fd, xbox_map_t *map){int len, type, number, value;struct js_event js;len = read(xbox_fd, &js, sizeof(struct js_event));if (len < 0){perror("read");return -1;}type = js.type;number = js.number;value = http://www.kingceram.com/post/js.value;map->time = js.time;if (type == JS_EVENT_BUTTON){switch (number){case XBOX_BUTTON_A:map->a = value;break;case XBOX_BUTTON_B:map->b = value;break;case XBOX_BUTTON_X:map->x = value;break;case XBOX_BUTTON_Y:map->y = value;break;case XBOX_BUTTON_LB:map->lb = value;break;case XBOX_BUTTON_RB:map->rb = value;break;case XBOX_BUTTON_START:map->start = value;break;case XBOX_BUTTON_BACK:map->back = value;break;case XBOX_BUTTON_HOME:map->home = value;break;case XBOX_BUTTON_LO:map->lo = value;break;case XBOX_BUTTON_RO:map->ro = value;break;default:break;}}else if (type == JS_EVENT_AXIS){switch(number){case XBOX_AXIS_LX:map->lx = value;break;case XBOX_AXIS_LY:map->ly = value;break;case XBOX_AXIS_RX:map->rx = value;break;case XBOX_AXIS_RY:map->ry = value;break;case XBOX_AXIS_LT:map->lt = value;break;case XBOX_AXIS_RT:map->rt = value;break;case XBOX_AXIS_XX:map->xx = value;break;case XBOX_AXIS_YY:map->yy = value;break;default:break;}}else{/* Init do nothing */}return len;}void xbox_close(int xbox_fd){close(xbox_fd);return;}int main(void){int xbox_fd ;xbox_map_t map;int len, type;int axis_value, button_value;int number_of_axis, number_of_buttons ;memset(&map, 0, sizeof(xbox_map_t));xbox_fd = xbox_open("/dev/input/js0");if(xbox_fd < 0){return -1;}while(1){len = xbox_map_read(xbox_fd, &map);if (len < 0){usleep(10*1000);continue;}printf("\rTime:%8d A:%d B:%d X:%d Y:%d LB:%d RB:%d start:%d back:%d home:%d LO:%d RO:%d XX:%-6d YY:%-6d LX:%-6d LY:%-6d RX:%-6d RY:%-6d LT:%-6d RT:%-6d",map.time, map.a, map.b, map.x, map.y, map.lb, map.rb, map.start, map.back, map.home, map.lo, map.ro,map.xx, map.yy, map.lx, map.ly, map.rx, map.ry, map.lt, map.rt);fflush(stdout);}xbox_close(xbox_fd);return 0;}

运行结果如图
可以从代码中获取各个键及方向盘的值～
如果代码报错：