Digitizer HID interface : absolute coordinates for mouse cursor (#12851)

* Add digitizer HID interface for setting the mouse cursor position at
absolute screen coordinates. Tested on Pro Micro, Proton C and
Blackpill.

* Update docs/feature_digitizer.md

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update tmk_core/protocol/usb_descriptor.c

Co-authored-by: Ryan <fauxpark@gmail.com>

* Add missing copyrights
Add V-USB support

* Add support for digitizer dedicated endpoint for lufa and chibios.
Fix formatting issues
Move digitizer_task definition to the feature's base implementation file

* Run cformat on modified files

* Change digitizer report usage to Digitizer instead of Pen to avoid
pointer disappearing on Windows.

* Update tmk_core/protocol/vusb/vusb.c

Co-authored-by: Ryan <fauxpark@gmail.com>

* Run cformat from docker image

* Remove send_digitizer from host_driver_t and instead rely on the
declaration being the interface to the implementation in each
HW-specific usb implementation.

* Fix build : send_digitizer shouldn't be static in vusb and add
weak-linkage implementation for tests without usb implementation

* Change digitizer user interface to match pointing device's

* Update documentation with new API

Co-authored-by: a-chol <nothing@none.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/keyboards/handwired/onekey/keymaps/digitizer/keymap.c b/keyboards/handwired/onekey/keymaps/digitizer/keymap.c
new file mode 100644
index 0000000000..6b304e86fe
--- /dev/null
+++ b/keyboards/handwired/onekey/keymaps/digitizer/keymap.c
@@ -0,0 +1,38 @@
+ /* Copyright 2021 QMK 
+  * 
+  * This program is free software: you can redistribute it and/or modify 
+  * it under the terms of the GNU General Public License as published by 
+  * the Free Software Foundation, either version 2 of the License, or 
+  * (at your option) any later version. 
+  * 
+  * This program is distributed in the hope that it will be useful, 
+  * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+  * GNU General Public License for more details. 
+  * 
+  * You should have received a copy of the GNU General Public License 
+  * along with this program.  If not, see <http://www.gnu.org/licenses/>. 
+  */ 
+#include QMK_KEYBOARD_H
+
+#include "digitizer.h"
+
+#include "math.h"
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {LAYOUT_ortho_1x1(KC_A)};
+
+uint32_t timer = 0;
+
+void matrix_scan_user() {
+    if (timer_elapsed32(timer) < 200) {
+        return;
+    }
+    
+    timer               = timer_read32();
+    digitizer_t digitizer;
+    digitizer.x         = 0.5 - 0.2 * cos(timer_read() / 250. / 6.28);
+    digitizer.y         = 0.5 - 0.2 * sin(timer_read() / 250. / 6.28);
+    digitizer.tipswitch = 0;
+    digitizer.inrange   = 1;
+    digitizer_set_report(digitizer);
+}