XiaoでtinyUSBが使用できるのはメニューをみれば分かるのですが、いざゲームパッドとなるとスケッチ例も無く、あきらめている方もおられるでしょう。
今回はXiaoをGamePadにする方法を掲載したいと思います。
実はゲームパッドのディスクリプタはtinyUSBに記載されています。
ここ→C:\Users\ユーザー名\AppData\Local\Arduino15\packages\Seeeduino\hardware\samd\1.7.9\cores\arduino\TinyUSB\Adafruit_TinyUSB_ArduinoCore\tinyusb\src\class\hid\hid_device.h
ただし、このディスクリプタ問題がありまして、HATスイッチ（十字キー）の記載がありません。なので追加してやります。下記が追加したディスクリプタです。
#define TUD_HID_REPORT_DESC_GAMEPAD(...) \ HID_USAGE_PAGE ( HID_USAGE_PAGE_DESKTOP ) ,\ HID_USAGE ( HID_USAGE_DESKTOP_GAMEPAD ) ,\ HID_COLLECTION ( HID_COLLECTION_APPLICATION ) ,\ /* Report ID if any */\ __VA_ARGS__ \ /* 16 bit Button Map */ \ HID_USAGE_PAGE ( HID_USAGE_PAGE_BUTTON ) ,\ HID_USAGE_MIN ( 1 ) ,\ HID_USAGE_MAX ( 12 ) ,\ HID_LOGICAL_MIN ( 0 ) ,\ HID_LOGICAL_MAX ( 1 ) ,\ HID_REPORT_COUNT ( 12 ) ,\ HID_REPORT_SIZE ( 1 ) ,\ HID_INPUT ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE ) ,\ HID_REPORT_COUNT ( 4 ) ,\ HID_INPUT ( 0x01 ) ,\ /*Hat Switch */ \ HID_USAGE_PAGE ( HID_USAGE_PAGE_DESKTOP ) ,\ HID_USAGE ( HID_USAGE_DESKTOP_HAT_SWITCH ) ,\ HID_LOGICAL_MIN ( 0 ) ,\ HID_LOGICAL_MAX ( 7 ) ,\ HID_PHYSICAL_MIN ( 0 ) ,\ HID_PHYSICAL_MAX ( 7 ) ,\ HID_REPORT_SIZE ( 8 ) ,\ HID_REPORT_COUNT ( 1 ) ,\ HID_INPUT ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE ) ,\ /* X, Y, Z, Rz (min -127, max 127 ) */ \ HID_USAGE_PAGE ( HID_USAGE_PAGE_DESKTOP ) ,\ HID_LOGICAL_MIN ( -128 ) ,\ HID_LOGICAL_MAX ( 127 ) ,\ HID_PHYSICAL_MIN ( -128 ) ,\ HID_PHYSICAL_MAX ( 127 ) ,\ HID_USAGE ( HID_USAGE_DESKTOP_X ) ,\ HID_USAGE ( HID_USAGE_DESKTOP_Y ) ,\ HID_USAGE ( HID_USAGE_DESKTOP_Z ) ,\ HID_USAGE ( HID_USAGE_DESKTOP_RZ ) ,\ HID_REPORT_COUNT ( 4 ) ,\ HID_REPORT_SIZE ( 8 ) ,\ HID_INPUT ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE ) ,\ HID_COLLECTION_END\
で、これだけ変更しても動かないので、API等々を追加してやります。
#include "struct.h"
typedef struct TU_ATTR_PACKED
{
uint16_t button16;
int8_t ghat;
int8_t gx;
int8_t gy;
int8_t gz;
int8_t gRz;
} hid_gamepad_report_t;
//--------------------------------------------------------------------+
// GAMEPAD APPLICATION API
//--------------------------------------------------------------------+
bool tud_hid_gamepad_report(uint8_t report_id, button btn, hat ah, int8_t gx, int8_t gy, int8_t gz, int8_t gRz)
{
uint16_t tmp = 0;
for (int i = 11; i >= 0; i--) {
tmp = (tmp << 1) | btn.no[i];
}
//Serial.println(btn.no[0]);
hid_gamepad_report_t report =
{
.button16 = tmp,
.ghat = ah.hat,
.gx = gx,
.gy = gy,
.gz = gz,
.gRz = gRz
};
return tud_hid_report(report_id, &report, sizeof(report));
}
// Report ID
enum
{
RID_KEYBOARD = 1,
RID_MOUSE,
RID_GAMEPAD
};
// HID report descriptor using TinyUSB's template
uint8_t const desc_hid_report[] =
{
TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(RID_KEYBOARD) ),
TUD_HID_REPORT_DESC_MOUSE ( HID_REPORT_ID(RID_MOUSE) ),
TUD_HID_REPORT_DESC_GAMEPAD ( HID_REPORT_ID(RID_GAMEPAD) )
};
これだけでゲームパッドが追加できてしまいます。
使用するときは上記のAPIに値をいれるだけ。
”tud_hid_gamepad_report(RID_GAMEPAD, button, 0, 0x7f, 0xff, 0x00, 0x80);”
簡単ですね。簡単という割にはこれを調べるのに丸一日かかりました。
最後にこの記述はMITライセンスに準じます。ファイルを作成する際は下記の記述を先頭に追加してください。
/* The MIT License (MIT) Copyright (c) 2020 uebayashi isao (gamepad.h) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. This file is part of the TinyUSB stack. */
ちなみに、ArduinoIDEを直接編集しなくても、スケッチブックにタブとして追加してそのファイルをメインタブからincludeしてやれば有効になります。