From 15b1623aa3b677100cb7e81bf05f0c3b481d355b Mon Sep 17 00:00:00 2001
From: Jay <33371449+jay94ks@users.noreply.github.com>
Date: Mon, 23 Dec 2024 22:03:37 +0900
Subject: add hid stylus pen device.

this works with android, for bypassing that absmouse does not support android.
note that, to hide cursor on android for every touch signal, find cursor option in android settings menu.

references:
1. https://stackoverflow.com/questions/28536602/hid-digitizer-descriptor-doesnt-perform-well-with-landscape-orientation
2. https://github.com/jonathanedgecombe/absmouse/blob/master/src/AbsMouse.cpp
---
 examples/device/hid_composite/src/main.c           | 34 +++++++++++++++++++++-
 .../device/hid_composite/src/usb_descriptors.c     |  1 +
 .../device/hid_composite/src/usb_descriptors.h     |  1 +
 3 files changed, 35 insertions(+), 1 deletion(-)

(limited to 'examples/device/hid_composite/src')

diff --git a/examples/device/hid_composite/src/main.c b/examples/device/hid_composite/src/main.c
index 5302af3b8..958d8f4af 100644
--- a/examples/device/hid_composite/src/main.c
+++ b/examples/device/hid_composite/src/main.c
@@ -197,11 +197,43 @@ static void send_hid_report(uint8_t report_id, uint32_t btn)
       }
     }
     break;
-
     default: break;
   }
 }
 
+/* use this to send stylus touch signal through USB. */
+static void send_stylus_touch(uint16_t x, uint16_t y, bool state)
+{
+  // skip if hid is not ready yet
+  if ( !tud_hid_ready() ) return;
+
+  static bool has_stylus_pen = false;
+
+  hid_stylus_report_t report = 
+  {
+    .attr = 0,
+    .x = 0,
+    .y = 0
+  };
+
+  report.x = x;
+  report.y = y;
+
+  if (state)
+  {
+    report.attr = STYLUS_ATTR_TIP_SWITCH | STYLUS_ATTR_IN_RANGE;
+    tud_hid_report(REPORT_ID_STYLUS_PEN, &report, sizeof(report));
+
+    has_stylus_pen = true;
+  }else
+  {
+    report.attr = 0;
+    if (has_stylus_pen) tud_hid_report(REPORT_ID_STYLUS_PEN, &report, sizeof(report));
+    has_stylus_pen = false;
+  }
+
+}
+
 // Every 10ms, we will sent 1 report for each HID profile (keyboard, mouse etc ..)
 // tud_hid_report_complete_cb() is used to send the next report after previous one is complete
 void hid_task(void)
diff --git a/examples/device/hid_composite/src/usb_descriptors.c b/examples/device/hid_composite/src/usb_descriptors.c
index e174db46d..15c6e1f73 100644
--- a/examples/device/hid_composite/src/usb_descriptors.c
+++ b/examples/device/hid_composite/src/usb_descriptors.c
@@ -79,6 +79,7 @@ uint8_t const desc_hid_report[] =
 {
   TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(REPORT_ID_KEYBOARD         )),
   TUD_HID_REPORT_DESC_MOUSE   ( HID_REPORT_ID(REPORT_ID_MOUSE            )),
+  TUD_HID_REPORT_DESC_STYLUS_PEN( HID_REPORT_ID(REPORT_ID_STYLUS_PEN     )),
   TUD_HID_REPORT_DESC_CONSUMER( HID_REPORT_ID(REPORT_ID_CONSUMER_CONTROL )),
   TUD_HID_REPORT_DESC_GAMEPAD ( HID_REPORT_ID(REPORT_ID_GAMEPAD          ))
 };
diff --git a/examples/device/hid_composite/src/usb_descriptors.h b/examples/device/hid_composite/src/usb_descriptors.h
index e733d31dd..18d31172b 100644
--- a/examples/device/hid_composite/src/usb_descriptors.h
+++ b/examples/device/hid_composite/src/usb_descriptors.h
@@ -29,6 +29,7 @@ enum
 {
   REPORT_ID_KEYBOARD = 1,
   REPORT_ID_MOUSE,
+  REPORT_ID_STYLUS_PEN,
   REPORT_ID_CONSUMER_CONTROL,
   REPORT_ID_GAMEPAD,
   REPORT_ID_COUNT
-- 
cgit v1.3.1


From b029c940356de3645fc224e429d9ec59acf62606 Mon Sep 17 00:00:00 2001
From: Jay <33371449+jay94ks@users.noreply.github.com>
Date: Mon, 23 Dec 2024 22:15:01 +0900
Subject: Modified example app.

---
 examples/device/hid_composite/src/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'examples/device/hid_composite/src')

diff --git a/examples/device/hid_composite/src/main.c b/examples/device/hid_composite/src/main.c
index 958d8f4af..bc12d2a93 100644
--- a/examples/device/hid_composite/src/main.c
+++ b/examples/device/hid_composite/src/main.c
@@ -241,6 +241,14 @@ void hid_task(void)
   // Poll every 10ms
   const uint32_t interval_ms = 10;
   static uint32_t start_ms = 0;
+  static uint32_t touch_ms = 0;
+  static bool touch_state = false;
+
+  if (board_millis() - touch_ms < 100) {
+    touch_ms = board_millis();
+    send_stylus_touch(0, 0, touch_state = !touch_state);
+    return;
+  }
 
   if ( board_millis() - start_ms < interval_ms) return; // not enough time
   start_ms += interval_ms;
-- 
cgit v1.3.1


From eb1c2b83ef09e87964d1d801c3b78caf924af63b Mon Sep 17 00:00:00 2001
From: Jay <33371449+jay94ks@users.noreply.github.com>
Date: Mon, 23 Dec 2024 22:19:35 +0900
Subject: trimed trailing whitespaces.

---
 examples/device/hid_composite/src/main.c | 2 +-
 src/class/hid/hid.h                      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

(limited to 'examples/device/hid_composite/src')

diff --git a/examples/device/hid_composite/src/main.c b/examples/device/hid_composite/src/main.c
index bc12d2a93..a58107b6f 100644
--- a/examples/device/hid_composite/src/main.c
+++ b/examples/device/hid_composite/src/main.c
@@ -209,7 +209,7 @@ static void send_stylus_touch(uint16_t x, uint16_t y, bool state)
 
   static bool has_stylus_pen = false;
 
-  hid_stylus_report_t report = 
+  hid_stylus_report_t report =
   {
     .attr = 0,
     .x = 0,
diff --git a/src/class/hid/hid.h b/src/class/hid/hid.h
index fb27c0d0e..b179fc72a 100644
--- a/src/class/hid/hid.h
+++ b/src/class/hid/hid.h
@@ -340,7 +340,7 @@ typedef struct TU_ATTR_PACKED
 } hid_stylus_report_t;
 
 // Standard Stylus Pen Attributes Bitmap.
-typedef enum 
+typedef enum
 {
   STYLUS_ATTR_TIP_SWITCH = TU_BIT(0), ///< Tip switch
   STYLUS_ATTR_IN_RANGE   = TU_BIT(1), ///< In-range bit.
-- 
cgit v1.3.1