tud_hid_report_complete_cb() API

update hid composite to make use of tud_hid_report_complete_cb() for
sending reports when possible.

changelog.md

@@ -1,5 +1,11 @@
 # TinyUSB Changelog
 
+## WIP
+
+- Fix dropping MIDI sysex message when fifo is full
+- Add DPad/Hat support for HID Gamepad
+- Add tud_hid_report_complete_cb() API
+
 ## 0.8.0 - 2021.02.05
 
 ### Device Controller Driver

examples/device/hid_composite/src/main.c

@@ -104,6 +104,98 @@ void tud_resume_cb(void)
 // USB HID
 //--------------------------------------------------------------------+
 
+static void send_hid_report(uint8_t report_id, uint32_t btn)
+{
+  // skip if hid is not ready yet
+  if ( !tud_hid_ready() ) return;
+
+  switch(report_id)
+  {
+    case REPORT_ID_KEYBOARD:
+    {
+      // use to avoid send multiple consecutive zero report for keyboard
+      static bool has_keyboard_key = false;
+
+      if ( btn )
+      {
+        uint8_t keycode[6] = { 0 };
+        keycode[0] = HID_KEY_A;
+
+        tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, keycode);
+        has_keyboard_key = true;
+      }else
+      {
+        // send empty key report if previously has key pressed
+        if (has_keyboard_key) tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, NULL);
+        has_keyboard_key = false;
+      }
+    }
+    break;
+
+    case REPORT_ID_MOUSE:
+    {
+      int8_t const delta = 5;
+
+      // no button, right + down, no scroll, no pan
+      tud_hid_mouse_report(REPORT_ID_MOUSE, 0x00, delta, delta, 0, 0);
+    }
+    break;
+
+    case REPORT_ID_CONSUMER_CONTROL:
+    {
+      // use to avoid send multiple consecutive zero report
+      static bool has_consumer_key = false;
+
+      if ( btn )
+      {
+        // volume down
+        uint16_t volume_down = HID_USAGE_CONSUMER_VOLUME_DECREMENT;
+        tud_hid_report(REPORT_ID_CONSUMER_CONTROL, &volume_down, 2);
+        has_consumer_key = true;
+      }else
+      {
+        // send empty key report (release key) if previously has key pressed
+        uint16_t empty_key = 0;
+        if (has_consumer_key) tud_hid_report(REPORT_ID_CONSUMER_CONTROL, &empty_key, 2);
+        has_consumer_key = false;
+      }
+    }
+    break;
+
+    case REPORT_ID_GAMEPAD:
+    {
+      // use to avoid send multiple consecutive zero report for keyboard
+      static bool has_gamepad_key = false;
+
+      hid_gamepad_report_t report =
+      {
+        .x   = 0, .y = 0, .z = 0, .rz = 0, .rx = 0, .ry = 0,
+        .hat = 0, .buttons = 0
+      };
+
+      if ( btn )
+      {
+        report.hat = GAMEPAD_HAT_UP;
+        report.buttons = GAMEPAD_BUTTON_A;
+        tud_hid_report(REPORT_ID_GAMEPAD, &report, sizeof(report));
+
+        has_gamepad_key = true;
+      }else
+      {
+        report.hat = GAMEPAD_HAT_CENTERED;
+        report.buttons = 0;
+        if (has_gamepad_key) tud_hid_report(REPORT_ID_GAMEPAD, &report, sizeof(report));
+        has_gamepad_key = false;
+      }
+    }
+    break;
+
+    default: break;
+  }
+}
+
+// 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)
 {
   // Poll every 10ms
@@ -121,97 +213,26 @@ void hid_task(void)
     // Wake up host if we are in suspend mode
     // and REMOTE_WAKEUP feature is enabled by host
     tud_remote_wakeup();
-  }
+  }else
-
-  /*------------- Mouse -------------*/
-  if ( tud_hid_ready() )
   {
-    if ( btn )
+    // Send the 1st of report chain, the rest will be sent by tud_hid_report_complete_cb()
-    {
+    send_hid_report(REPORT_ID_KEYBOARD, btn);
-      int8_t const delta = 5;
-
-      // no button, right + down, no scroll pan
-      tud_hid_mouse_report(REPORT_ID_MOUSE, 0x00, delta, delta, 0, 0);
-
-      // delay a bit before sending keyboard report
-      board_delay(10);
-    }
   }
+}
 
-  /*------------- Keyboard -------------*/
+// Invoked when sent REPORT successfully to host
-  if ( tud_hid_ready() )
+// Application can use this to send the next report
+// Note: For composite reports, report[0] is report ID
+void tud_hid_report_complete_cb(uint8_t itf, uint8_t const* report, uint8_t len)
+{
+  (void) itf;
+  (void) len;
+
+  uint8_t next_report_id = report[0] + 1;
+
+  if (next_report_id < REPORT_ID_COUNT)
   {
-    // use to avoid send multiple consecutive zero report for keyboard
+    send_hid_report(next_report_id, board_button_read());
-    static bool has_key = false;
-
-    if ( btn )
-    {
-      uint8_t keycode[6] = { 0 };
-      keycode[0] = HID_KEY_A;
-
-      tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, keycode);
-
-      has_key = true;
-    }else
-    {
-      // send empty key report if previously has key pressed
-      if (has_key) tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, NULL);
-      has_key = false;
-    }
-
-    // delay a bit before sending consumer report
-    board_delay(10);
-  }
-
-  /*------------- Consume Control -------------*/
-  if ( tud_hid_ready() )
-  {
-    // use to avoid send multiple consecutive zero report
-    static bool has_consumer_key = false;
-
-    if ( btn )
-    {
-      // volume down
-      uint16_t volume_down = HID_USAGE_CONSUMER_VOLUME_DECREMENT;
-      tud_hid_report(REPORT_ID_CONSUMER_CONTROL, &volume_down, 2);
-
-      has_consumer_key = true;
-    }else
-    {
-      // send empty key report (release key) if previously has key pressed
-      uint16_t empty_key = 0;
-      if (has_consumer_key) tud_hid_report(REPORT_ID_CONSUMER_CONTROL, &empty_key, 2);
-      has_consumer_key = false;
-    }
-
-    // delay a bit before sending next report
-    board_delay(10);
-  }
-
-  /*------------- Gamepad -------------*/
-  if ( tud_hid_ready() )
-  {
-    // use to avoid send multiple consecutive zero report for keyboard
-    static bool has_gamepad_key = false;
-
-    hid_gamepad_report_t report =
-    {
-      .x   = 0, .y = 0, .z = 0, .rz = 0, .rx = 0, .ry = 0,
-      .hat = 0, .buttons = 0
-    };
-
-    if ( btn )
-    {
-      report.hat = GAMEPAD_HAT_UP;
-      tud_hid_report(REPORT_ID_GAMEPAD, &report, sizeof(report));
-
-      has_gamepad_key = true;
-    }else
-    {
-      report.hat = GAMEPAD_HAT_CENTERED;
-      if (has_gamepad_key) tud_hid_report(REPORT_ID_GAMEPAD, &report, sizeof(report));
-      has_gamepad_key = false;
-    }
   }
 }
 

examples/device/hid_composite/src/usb_descriptors.c

@@ -107,7 +107,7 @@ uint8_t const desc_configuration[] =
   TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
 
   // Interface number, string index, protocol, report descriptor len, EP In address, size & polling interval
-  TUD_HID_DESCRIPTOR(ITF_NUM_HID, 0, HID_PROTOCOL_NONE, sizeof(desc_hid_report), EPNUM_HID, CFG_TUD_HID_EP_BUFSIZE, 10)
+  TUD_HID_DESCRIPTOR(ITF_NUM_HID, 0, HID_PROTOCOL_NONE, sizeof(desc_hid_report), EPNUM_HID, CFG_TUD_HID_EP_BUFSIZE, 2)
 };
 
 // Invoked when received GET CONFIGURATION DESCRIPTOR

examples/device/hid_composite/src/usb_descriptors.h

@@ -30,7 +30,8 @@ enum
   REPORT_ID_KEYBOARD = 1,
   REPORT_ID_MOUSE,
   REPORT_ID_CONSUMER_CONTROL,
-  REPORT_ID_GAMEPAD
+  REPORT_ID_GAMEPAD,
+  REPORT_ID_COUNT
 };
 
 #endif /* USB_DESCRIPTORS_H_ */

src/class/hid/hid_device.c

@@ -381,14 +381,24 @@ bool hidd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
   uint8_t itf = 0;
   hidd_interface_t * p_hid = _hidd_itf;
 
-  for ( ; ; itf++, p_hid++)
+  // Identify which interface to use
+  for (itf = 0; itf < CFG_TUD_HID; itf++)
   {
-    if (itf >= TU_ARRAY_SIZE(_hidd_itf)) return false;
+    p_hid = &_hidd_itf[itf];
-
+    if ( (ep_addr == p_hid->ep_out) || (ep_addr == p_hid->ep_in) ) break;
-    if ( ep_addr == p_hid->ep_out ) break;
   }
+  TU_ASSERT(itf < CFG_TUD_HID);
 
-  if (ep_addr == p_hid->ep_out)
+  // Sent report successfully
+  if (ep_addr == p_hid->ep_in)
+  {
+    if (tud_hid_report_complete_cb)
+    {
+      tud_hid_report_complete_cb(itf, p_hid->epin_buf, (uint8_t) xferred_bytes);
+    }
+  }
+  // Received report
+  else if (ep_addr == p_hid->ep_out)
   {
     tud_hid_set_report_cb(
         #if CFG_TUD_HID > 1

src/class/hid/hid_device.h

@@ -123,7 +123,10 @@ TU_ATTR_WEAK bool tud_hid_set_idle_cb(uint8_t idle_rate);
 
 #endif
 
-// TU_ATTR_WEAK void tud_hid_report_complete_cb(uint8_t itf, );
+// Invoked when sent REPORT successfully to host
+// Application can use this to send the next report
+// Note: For composite reports, report[0] is report ID
+TU_ATTR_WEAK void tud_hid_report_complete_cb(uint8_t itf, uint8_t const* report, uint8_t len);
 
 
 //--------------------------------------------------------------------+