Fix up tap_code functionality

docs/config_options.md

@@ -160,6 +160,8 @@ If you define these options you will enable the associated feature, which may in
   * Set this to the number of combos that you're using in the [Combo](feature_combo.md) feature.
 * `#define COMBO_TERM 200`
   * how long for the Combo keys to be detected. Defaults to `TAPPING_TERM` if not defined.
+* `#define TAP_CODE_DELAY 100`
+  * Sets the delay between `register_code` and `unregister_code`, if you're having issues with it registering properly (common on VUSB boards).
 
 ## RGB Light Configuration
 

docs/feature_macros.md

@@ -232,6 +232,8 @@ Parallel to `register_code` function, this sends the `<kc>` keyup event to the c
 
 This will send `register_code(<kc>)` and then `unregister_code(<kc>)`. This is useful if you want to send both the press and release events ("tap" the key, rather than hold it).
 
+You can add a delay between the register and unregister event by adding `#define TAP_CODE_DELAY 100` to your `config.h` file. 
+
 ### `clear_keyboard();`
 
 This will clear all mods and keys currently pressed.

quantum/quantum.c

@@ -132,6 +132,14 @@ void unregister_code16 (uint16_t code) {
   }
 }
 
+void tap_code16(uint16_t code) {
+  register_code16(code);
+  #if defined(TAP_CODE_DELAY) && TAP_CODE_DELAY > 0
+    wait_ms(TAP_CODE_DELAY);
+  #endif
+  unregister_code16(code);
+}
+
 __attribute__ ((weak))
 bool process_action_kb(keyrecord_t *record) {
   return true;

quantum/quantum.h

@@ -242,7 +242,7 @@ void shutdown_user(void);
 
 void register_code16(uint16_t code);
 void unregister_code16(uint16_t code);
-inline void tap_code16(uint16_t code) { register_code16(code); unregister_code16(code); }
+void tap_code16(uint16_t code);
 
 #ifdef BACKLIGHT_ENABLE
 void backlight_init_ports(void);

tmk_core/common/action.c

@@ -847,6 +847,18 @@ void unregister_code(uint8_t code)
     #endif
 }
 
+/** \brief Utilities for actions. (FIXME: Needs better description)
+ *
+ * FIXME: Needs documentation.
+ */
+void tap_code(uint8_t code) {
+  register_code(code);
+  #if defined(TAP_CODE_DELAY) && TAP_CODE_DELAY > 0
+    wait_ms(TAP_CODE_DELAY);
+  #endif
+  unregister_code(code);
+}
+
 /** \brief Utilities for actions. (FIXME: Needs better description)
  *
  * FIXME: Needs documentation.

tmk_core/common/action.h

@@ -88,7 +88,7 @@ void process_record(keyrecord_t *record);
 void process_action(keyrecord_t *record, action_t action);
 void register_code(uint8_t code);
 void unregister_code(uint8_t code);
-inline void tap_code(uint8_t code) { register_code(code); unregister_code(code); }
+void tap_code(uint8_t code);
 void register_mods(uint8_t mods);
 void unregister_mods(uint8_t mods);
 //void set_mods(uint8_t mods);