目录[-]
1、查看设备
在项目中需要使用游戏手柄对设备进行一些操作，在此选择了微软xbox手柄，通过在linux下调用设备描述文件来获取游戏手柄的输入数据，使用步骤以及代码描述如下。
• Microsoft X-Box One S pad 游戏手柄在ubuntu下的驱动程序；
sudo apt-get install joystick
• 在linux系统下，向系统中插入硬件时，操作系统回味每一个设备分配一个event号，在开发游戏手柄驱动时，需要首先找到游戏手柄对应的event以及线程，通过以下指令可以获取；
cat /proc/bus/input/devices
• linux下，查看系统中插入设备对应的所有event以及线程：
ls /dev/input
• 查看端口输出：
cat /dev/input/js0 | hexdump
2、代码描述
#include "fcntl.h"//Unix 下通用头文件，包含文件的open，close函数
#include "stdio.h"//perror
#include "stdlib.h"
#include "linux/joystick.h"
#include "string.h"//memset
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/joystick.h>
#include "../include/microbox.h"
//microbox_acti_type-> 1:button;2:axis
/*==button==*/
#define microbox_type_button 1
//microbox_acti_button_number-> 0:A; 1:B; 2:X; 3:Y
#define microbox_number_button_A 0
#define microbox_number_button_B 1
#define microbox_number_button_X 2
#define microbox_number_button_Y 3
#define microbox_number_button_LB 4
#define microbox_number_button_RB 5
#define microbox_number_button_COPY 6
#define microbox_number_button_FILE 7
#define microbox_number_button_EARTH 8
#define microbox_number_button_LEFTJOY_PRESSED 9
#define microbox_number_button_RIGHTJOY_PRESSED 10
//microbox_acti_button_value-> 0:没有被按下； 1：按钮被按下
#define microbox_value_up 0
#define microbox_value_down 1
/*==axis==*/
#define microbox_type_axis 2
//microbox_acti_axis_number-> 0:左侧摇杆X轴；1：左侧摇杆Y轴；2：左侧摇杆T轴
//3:右侧摇杆X轴；4：右侧摇杆Y轴；5：右侧摇杆T轴;6：左侧＋按钮X轴；7：左侧＋按钮Y轴
#define microbox_number_axis_lEFTJOY_X 0
#define microbox_number_axis_lEFTJOY_Y 1
#define microbox_number_axis_lEFTJOY_T 2
#define microbox_number_axis_RIGHTJOY_X 3
#define microbox_number_axis_RIGHTJOY_Y 4
#define microbox_number_axis_RIGHTJOY_T 5
#define microbox_number_axis_PLUSJOY_X 6
#define microbox_number_axis_PLUSJOY_Y 7
typedef struct microbox_map
{
int time;
int btn_A;
int btn_B;
int btn_X;
int btn_Y;
int btn_LB;
int btn_RB;
int btn_COPY;
int btn_FILE;
int btn_EARTH;
int btn_LFT_JOY_PRESSED;
int btn_RIT_JOY_PRESSED;
int axis_LFT_JOY_X;
int axis_LFT_JOY_Y;
int axis_LFT_JOY_T;
int axis_RIT_JOY_X;
int axis_RIT_JOY_Y;
int axis_RIT_JOY_T;
int axis_PLUS_JOY_X;
int axis_PLUS_JOY_Y;
}microbox_map_t;
//打开手柄对应的文件
int microbox_open(const char *file_name){
int microbox_fd;
microbox_fd = open(file_name,O_RDONLY);
if (microbox_fd <0) {
perror("open");
return -1;
usleep(1000*1000);
}else{
printf("microbox has been opened:fd=%d\n",microbox_fd);
return microbox_fd;
}
}
//读取手柄对应的文件
int microbox_read(int microbox_fd,microbox_map_t *map){
int len,time,type,number,value;
struct js_event js;
len = read(microbox_fd,&js,sizeof(struct js_event));
if (len<0){
perror("read");
return -1;
}
type = js.type;
number = js.number;
value = js.value;
time = js.time;
map->time = time;
if (type == microbox_type_button){
switch(number){
case microbox_number_button_A:
map->btn_A = value;
break;
case microbox_number_button_B:
map->btn_B = value;
break;
case microbox_number_button_X:
map->btn_X = value;
break;
case microbox_number_button_Y:
map->btn_Y = value;
break;
case microbox_number_button_LB:
map->btn_LB = value;
break;
case microbox_number_button_RB:
map->btn_RB = value;
break;
case microbox_number_button_EARTH:
map->btn_EARTH = value;
break;
case microbox_number_button_COPY:
map->btn_COPY = value;
break;
case microbox_number_button_FILE:
map->btn_FILE = value;
break;
case microbox_number_button_LEFTJOY_PRESSED:
map->btn_LFT_JOY_PRESSED = value;
break;
case microbox_number_button_RIGHTJOY_PRESSED:
map->btn_RIT_JOY_PRESSED = value;
break;
default:
break;
}
}else if (type == microbox_type_axis){
switch(number){
case microbox_number_axis_lEFTJOY_X:
map->axis_LFT_JOY_X = value;
break;
case microbox_number_axis_lEFTJOY_Y:
map->axis_LFT_JOY_Y = value;
break;
case microbox_number_axis_lEFTJOY_T:
map->axis_LFT_JOY_T = value;
break;
case microbox_number_axis_RIGHTJOY_X:
map->axis_RIT_JOY_X = value;
break;
case microbox_number_axis_RIGHTJOY_Y:
map->axis_RIT_JOY_Y = value;
break;
case microbox_number_axis_RIGHTJOY_T:
map->axis_RIT_JOY_T = value;
break;
case microbox_number_axis_PLUSJOY_X:
map->axis_PLUS_JOY_X = value;
break;
case microbox_number_axis_PLUSJOY_Y:
map->axis_PLUS_JOY_Y = value;
break;
default:
break;
}
}else{
perror("errno");
}
printf("\rTime:%8d A:%d B:%d X:%d Y:%d LB:%d RB:%d COPY:%d FILE:%d EARTH:%d LP:%d RP:%d XX:%-6d XY:%-6d XZ:%-6d RX:%-6d RY:%-6d RZ:%-6d PX:%-6d PY:%-6d",
map->time, map->btn_A, map->btn_B, map->btn_X, map->btn_Y, map->btn_LB, map->btn_RB, map->btn_EARTH, map->btn_COPY, map->btn_FILE, map->btn_LFT_JOY_PRESSED, map->btn_RIT_JOY_PRESSED,
map->axis_LFT_JOY_X, map->axis_LFT_JOY_Y, map->axis_LFT_JOY_T, map->axis_RIT_JOY_X, map->axis_RIT_JOY_Y, map->axis_RIT_JOY_T, map->axis_PLUS_JOY_X, map->axis_PLUS_JOY_Y);
}
//关闭手柄对应的文件
void microbox_close(int microbox_fd){
close(microbox_fd);
return;
}
int main(void){
int len,microbox_fd;
microbox_map_t microbox_value_map;
memset(µbox_value_map,0,sizeof(microbox_map_t));
microbox_fd = microbox_open("/dev/input/js0");
while(1){
len = microbox_read(microbox_fd,µbox_value_map);
if (len <0){
memset(µbox_value_map,0,sizeof(microbox_map_t));
microbox_fd = microbox_open("/dev/input/js0");
usleep(1000*1000);
fflush(stdout);
continue;
}
fflush(stdout);
if (microbox_value_map.btn_EARTH == 1){
microbox_close(microbox_fd);
}
}
}