enhance device hid

- add CFG_TUD_HID_ASCII_TO_KEYCODE_LOOKUP
- add tud_hid_keyboard_send_keycode(), tud_hid_keyboard_send_char(),
tud_hid_keyboard_send_string()
- add timeout_blocking_wait()

examples/device/nrf52840/src/main.c

@@ -76,6 +76,9 @@ int main(void)
   return 0;
 }
 
+//--------------------------------------------------------------------+
+// USB CDC
+//--------------------------------------------------------------------+
 void virtual_com_task(void)
 {
   // connected and there are data available
@@ -91,6 +94,30 @@ void virtual_com_task(void)
   }
 }
 
+//--------------------------------------------------------------------+
+// USB CDC
+//--------------------------------------------------------------------+
+void usb_hid_task(void)
+{
+  if ( tud_mounted() )
+  {
+    if ( !tud_hid_keyboard_busy() )
+    {
+      static bool toggle = false; // send either A or B
+
+      tud_hid_keyboard_send_char( toggle ? 'A' : 'B' );
+      toggle = !toggle;
+    }
+
+    if ( !tud_hid_mouse_busy() )
+    {
+
+    }
+
+  }
+}
+
+
 
 //--------------------------------------------------------------------+
 // tinyusb callbacks

examples/device/nrf52840/src/tusb_config.h

@@ -126,6 +126,13 @@
  */
 #define CFG_TUD_HID_BOOT_PROTOCOL   1
 
+/* Use the HID_ASCII_TO_KEYCODE lookup if CFG_TUD_HID_KEYBOARD is enabled.
+ * This will occupies 256 bytes of ROM. It will also enable the use of 2 extra APIs
+ * - tud_hid_keyboard_send_char()
+ * - tud_hid_keyboard_send_string()
+ */
+#define CFG_TUD_HID_ASCII_TO_KEYCODE_LOOKUP 1
+
 //--------------------------------------------------------------------
 // USB RAM PLACEMENT
 //--------------------------------------------------------------------