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【HD-G2UL-EVM开发板体验】掌上游戏机之一 —— 输入设备USB游戏手柄按键采集

前言

前面我们已经按计划完成了性能测试，主要接口的测试。现在开始我们完成一些实际的有意思的项目，按照计划第一个是掌上游戏机的实现。

从现在开始我们一步一步来移植NES游戏模拟器,制作一个掌上游戏机。移植NES游戏模拟器主要需要实现按键输入,显示,音频输出三个部分。今天实现第一个部分按键输入。

USB输入设备

USB输入设备连接

连接USB手柄之前查看输入设备

root@g2uliot:~# ls /dev/input/

by-path event0 touchscreen0

连接USB手柄到USB,串口打印如下信息

引用: root@g2uliot:~# [ 1904.533449] usb 1-1.2: new low-speed USB device number 5 using ehci-platform

[ 1904.782050] input: USB Gamepad as /devices/platform/soc/11c70100.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:0810:0001.0002/input/input2

[ 1904.814048] hid-generic 0003:0810:0001.0002: input: USB HID v1.10 Joystick [ USB Gamepad ] on usb-11c70100.usb-1.2/input0

查看输入设备多了event1和js0 by-id

root@g2uliot:~# ls /dev/input/

by-id by-path event0 event1 js0 touchscreen0

root@g2uliot:~#

cat /proc/bus/input/devices查看设备信息

引用: root@g2uliot:~# cat /proc/bus/input/devices

I: Bus=0000 Vendor=0000 Product=0000 Version=0000

N: Name="ADS7846 Touchscreen"

P: Phys=spi1.0/input0

S: Sysfs=/devices/platform/soc/1004ac00.spi/spi_master/spi1/spi1.0/input/input0

U: Uniq=

H: Handlers=event0

B: PROP=0

B: EV=b

B: KEY=400 0 0 0 0 0 0 0 0 0 0

B: ABS=1000003

I: Bus=0003 Vendor=0810 Product=0001 Version=0110

N: Name=" USB Gamepad "

P: Phys=usb-11c70100.usb-1.2/input0

S: Sysfs=/devices/platform/soc/11c70100.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:0810:0001.0002/input/input2

U: Uniq=

H: Handlers=js0 event1

B: PROP=0

B: EV=1b

B: KEY=fff 0 0 0 0 0 0 0 0 0

B: ABS=30027

B: MSC=10

root@g2uliot:~#

输入设备测试

cat /dev/input/event1 | hexdump -C 按手柄的不同按键

打印如下

引用: root@g2uliot:~# cat /dev/input/event1 | hexdump -C

00000000  8c 3b 67 5f 8c 55 05 00  04 00 04 00 03 00 09 00  |.;g_.U..........|

00000010  8c 3b 67 5f 8c 55 05 00  01 00 22 01 01 00 00 00  |.;g_.U....".....|

00000020  8c 3b 67 5f 8c 55 05 00  00 00 00 00 00 00 00 00  |.;g_.U..........|

00000030  8c 3b 67 5f 8a 3d 09 00  04 00 04 00 03 00 09 00  |.;g_.=..........|

00000040  8c 3b 67 5f 8a 3d 09 00  01 00 22 01 00 00 00 00  |.;g_.=....".....|

00000050  8c 3b 67 5f 8a 3d 09 00  00 00 00 00 00 00 00 00  |.;g_.=..........|

00000060  8d 3b 67 5f 07 f9 09 00  03 00 00 00 00 00 00 00  |.;g_............|

00000070  8d 3b 67 5f 07 f9 09 00  00 00 00 00 00 00 00 00  |.;g_............|

00000080  8d 3b 67 5f 4b 89 0c 00  03 00 00 00 7f 00 00 00  |.;g_K...........|

00000090  8d 3b 67 5f 4b 89 0c 00  00 00 00 00 00 00 00 00  |.;g_K...........|

000000a0  8e 3b 67 5f c8 0f 01 00  03 00 01 00 00 00 00 00  |.;g_............|

000000b0  8e 3b 67 5f c8 0f 01 00  00 00 00 00 00 00 00 00  |.;g_............|

000000c0  8e 3b 67 5f c9 03 03 00  03 00 01 00 7f 00 00 00  |.;g_............|

000000d0  8e 3b 67 5f c9 03 03 00  00 00 00 00 00 00 00 00  |.;g_............|

000000e0  8e 3b 67 5f 07 94 05 00  03 00 00 00 ff 00 00 00  |.;g_............|

000000f0  8e 3b 67 5f 07 94 05 00  00 00 00 00 00 00 00 00  |.;g_............|

00000100  8e 3b 67 5f 08 88 07 00  03 00 00 00 7f 00 00 00  |.;g_............|

00000110  8e 3b 67 5f 08 88 07 00  00 00 00 00 00 00 00 00  |.;g_............|

00000120  8e 3b 67 5f cb 50 0b 00  03 00 01 00 ff 00 00 00  |.;g_.P..........|

00000130  8e 3b 67 5f cb 50 0b 00  00 00 00 00 00 00 00 00  |.;g_.P..........|

00000140  8e 3b 67 5f c7 44 0d 00  03 00 01 00 7f 00 00 00  |.;g_.D..........|

00000150  8e 3b 67 5f c7 44 0d 00  00 00 00 00 00 00 00 00  |.;g_.D..........|

00000160  8f 3b 67 5f 4a 9b 09 00  03 00 00 00 ff 00 00 00  |.;g_J...........|

00000170  8f 3b 67 5f 4a 9b 09 00  00 00 00 00 00 00 00 00  |.;g_J...........|

00000180  8f 3b 67 5f 8a 2b 0c 00  03 00 00 00 7f 00 00 00  |.;g_.+..........|

00000190  8f 3b 67 5f 8a 2b 0c 00  00 00 00 00 00 00 00 00  |.;g_.+..........|

000001a0  90 3b 67 5f d0 15 00 00  04 00 04 00 09 00 09 00  |.;g_............|

000001b0  90 3b 67 5f d0 15 00 00  01 00 28 01 01 00 00 00  |.;g_......(.....|

000001c0  90 3b 67 5f d0 15 00 00  00 00 00 00 00 00 00 00  |.;g_............|

000001d0  90 3b 67 5f 89 ea 01 00  04 00 04 00 09 00 09 00  |.;g_............|

000001e0  90 3b 67 5f 89 ea 01 00  01 00 28 01 00 00 00 00  |.;g_......(.....|

000001f0  90 3b 67 5f 89 ea 01 00  00 00 00 00 00 00 00 00  |.;g_............|

00000200  90 3b 67 5f 4a 42 03 00  04 00 04 00 0a 00 09 00  |.;g_JB..........|

00000210  90 3b 67 5f 4a 42 03 00  01 00 29 01 01 00 00 00  |.;g_JB....).....|

00000220  90 3b 67 5f 4a 42 03 00  00 00 00 00 00 00 00 00  |.;g_JB..........|

00000230  90 3b 67 5f 89 d2 05 00  04 00 04 00 0a 00 09 00  |.;g_............|

00000240  90 3b 67 5f 89 d2 05 00  01 00 29 01 00 00 00 00  |.;g_......).....|

00000250  90 3b 67 5f 89 d2 05 00  00 00 00 00 00 00 00 00  |.;g_............|

00000260  90 3b 67 5f 87 c6 07 00  03 00 01 00 00 00 00 00  |.;g_............|

00000270  90 3b 67 5f 87 c6 07 00  00 00 00 00 00 00 00 00  |.;g_............|

00000280  90 3b 67 5f 49 9b 09 00  03 00 01 00 7f 00 00 00  |.;g_I...........|

00000290  90 3b 67 5f 49 9b 09 00  00 00 00 00 00 00 00 00  |.;g_I...........|

000002a0  90 3b 67 5f c8 56 0a 00  04 00 04 00 01 00 09 00  |.;g_.V..........|

000002b0  90 3b 67 5f c8 56 0a 00  01 00 20 01 01 00 00 00  |.;g_.V.... .....|

000002c0  90 3b 67 5f c8 56 0a 00  00 00 00 00 00 00 00 00  |.;g_.V..........|

000002d0  90 3b 67 5f 8b 2b 0c 00  04 00 04 00 01 00 09 00  |.;g_.+..........|

000002e0  90 3b 67 5f 8b 2b 0c 00  01 00 20 01 00 00 00 00  |.;g_.+.... .....|

000002f0  90 3b 67 5f 8b 2b 0c 00  00 00 00 00 00 00 00 00  |.;g_.+..........|

按键也会有相应的变化

输入设备代码操作

由于游戏需要至少A,B,SELECT,START,UP,DOWN,LEFT,RIGHT 8个按键,

刚好手里有一个USB手柄,我们就以该手柄进行测试。

需要实现以下获取按键的函数

引用: /* Query a button's state.

Returns 1 if button #b is pressed. */

int nes_key_state(int b)

{

ALLEGRO_KEYBOARD_STATE state;

al_get_keyboard_state(&state);

switch (b)

{

      case 0: // On / Off

         return 1;

      case 1: // A

         return al_key_down(&state, ALLEGRO_KEY_K);

      case 2: // B

         return al_key_down(&state, ALLEGRO_KEY_J);

      case 3: // SELECT

         return al_key_down(&state, ALLEGRO_KEY_U);

      case 4: // START

         return al_key_down(&state, ALLEGRO_KEY_I);

      case 5: // UP

         return al_key_down(&state, ALLEGRO_KEY_W);

      case 6: // DOWN

         return al_key_down(&state, ALLEGRO_KEY_S);

      case 7: // LEFT

         return al_key_down(&state, ALLEGRO_KEY_A);

      case 8: // RIGHT

         return al_key_down(&state, ALLEGRO_KEY_D);

      default:

         return 1;

}

}

先编写按键测试代码如下

struct input_event参见input.h的定义

引用: #include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

int s_keys_fd = -1;

uint32_t s_keys_state = 0;

void* key_poll(void* arg)

{

char ret[2];

struct input_event t;

s_keys_fd = open((char*)arg, O_RDONLY);

if(s_keys_fd <= 0)

{

printf("open %s device error!n",(char*)arg);

return 0;

}

while(1)

{

if(read(s_keys_fd, &t, sizeof(t)) == sizeof(t))

{

if(t.type==EV_KEY)

{

if(t.value==0 || t.value==1)

{

printf("key %d %sn", t.code, (t.value) ? "Pressed" : "Released");

//if(t.code == KEY_ESC)

// break;

}

}

else

{

///printf("type %d code %d value %dn", t.type, t.code, t.value);

}

}

}

return 0;

}

void key_init(void* arg)

{

pthread_t id;

/* 创建函数线程，并且指定函数线程要执行的函数 */

int res = pthread_create(&id,NULL,key_poll,arg);

assert(res == 0);

while(1)

{

}

exit(0);

}

int key_getstate(int key)

{

}

int main(int argc, char* argv[])

{

key_init(argv[1]);

while(1);

}

编译

aarch64-linux-gnu-gcc key.c -o key -lpthread

将文件key导入到开发板

chmod +x key

运行./key /dev/input/event1

测试

按键SELECT

key 296 Pressed

key 296 Released

按键START

key 297 Pressed

key 297 Released

右边按键上

key 288 Pressed

key 288 Released

右边按键下

key 290 Pressed

key 290 Released

右边按键左

key 291 Pressed

key 291 Released

右边按键右

key 289 Pressed

key 289 Released

右边前面上按键

key 293 Pressed

key 293 Released

右边前面下按键

key 295 Pressed

key 295 Released

左边前面上按键

key 292Pressed

key 292 Released

左边前面下按键

key 294 Pressed

key 294 Released

左边的上下左右四个按键无响应。

总结

我们现在实现了游戏手柄按键输入的采集,完成了第一部分，后面继续显示和音频部分。

更多回帖

jf_1137202360

【HD-G2UL-EVM开发板体验】掌上游戏机之一 —— 输入设备USB游戏手柄按键采集

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