嵌入式

Linux input keyevent

2019-07-13 08:17发布

站内文章 / 嵌入式Linux
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#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int _keyfd[2] = {0}; static int number = 0; static int _maxfd = 0; #define INPUT_DEVICE_MAX 2 //0:release, 1:press, 2:repeat #define KEY_TYPE_RELEASE 0 #define KEY_TYPE_PRESS 1 #define KEY_TYPE_REPEAT 2 #define KEY_LONGPRESS_SEC 1 //second #define KEY_LONGPRESS_USEC (50 *1000) // int key_long_press(int keycode) { switch(keycode) { case KEY_VOLUMEDOWN: { printf("long press KEY_VOLUMEDOWN "); } break; case KEY_VOLUMEUP: { printf("long press KEY_VOLUMEUP "); } break; case KEY_HOME: { printf("long press KEY_HOME "); } break; case KEY_MUTE: { printf("long press KEY_MUTE "); } break; default: break; } return 0; } int key_normal_press(int keycode) { switch(keycode) { case KEY_VOLUMEDOWN: { printf("normal press KEY_VOLUMEDOWN "); } break; case KEY_VOLUMEUP: { printf("normal press KEY_VOLUMEUP "); } break; case KEY_HOME: { printf("normal press KEY_HOME "); } break; case KEY_MUTE: { printf("normal press KEY_MUTE "); } break; default: break; } return 0; } int main(int argc, char **argv) { char name[128] = {0}; int fd = -1; int i = 0; uint8_t is_longpress=0; struct timeval keypress_timeval; struct input_event event; size_t num; fd_set key_fd_set; for (i=0; i < INPUT_DEVICE_MAX; i++) { memset(name, 0, sizeof(name)); snprintf(name, sizeof(name), "/dev/input/event%d", i); if((fd = open(name, O_RDONLY, 0666)) >= 0) { int version; char buffer[256] = {0}; ioctl(fd, EVIOCGVERSION, &version); ioctl(fd, EVIOCGNAME(sizeof(buffer)), buffer); printf("==================================================== "); printf(" input name %s ", buffer); printf(" input version %d.%d.%d ", ((version >> 16) & 0xff), ((version >> 8) & 0xff) , ((version) & 0xff)); _keyfd[number] = fd; number++; if (fd > _maxfd) _maxfd = fd; } } while(1) { FD_ZERO(&key_fd_set); for(num = 0; num < number; num++) { FD_SET(_keyfd[num], &key_fd_set); } int ret = select(_maxfd + 1, &key_fd_set, NULL, NULL, NULL); if(ret < 0){ break; } else if (ret == 0){ continue; } for(i=0; i < number; i++){ if(FD_ISSET(_keyfd[i], &key_fd_set)) { if(read(_keyfd[i], &event, sizeof(event)) > 0) { switch(event.type) { case EV_KEY: { int keycode = event.code & 0xff; int keyvalue = event.value; //0:release, 1:press, 2:repeat struct timeval time = event.time; printf("keycode:%d, keyvalue:%d, tv_sec:%d, tv_usec:%d ", keycode, keyvalue, time.tv_sec, time.tv_usec); if(KEY_TYPE_PRESS == keyvalue) { keypress_timeval = event.time; } else if (KEY_TYPE_REPEAT == keyvalue) { if((time.tv_sec > keypress_timeval.tv_sec + KEY_LONGPRESS_SEC) &&(time.tv_usec > keypress_timeval.tv_usec + KEY_LONGPRESS_USEC)) { is_longpress = 1; keypress_timeval = event.time; key_long_press(keycode); } } else if (KEY_TYPE_RELEASE == keyvalue) { if(is_longpress){ is_longpress = 0; break; } key_normal_press(keycode); } #if 0 if(keyvalue && keycode == KEY_VOLUMEDOWN){ printf("key KEY_VOLUMEDOWN "); } else if () #endif } break; case EV_SYN: { printf("key EV_SYN "); } break; default: break; } } } } } return 0; }

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