Refactor global bindings, implement mod-tap.

* Use extra comptible = "zmk,behavior-global" to add
   behaviors to global bindings for event notification.
* Implement mod-tap, as a keymap binding and global one
  to skip tap if other keycode pressed while held.

1 files changed, 89 insertions, 0 deletions

diff --git a/app/src/behaviors/behavior_mod_tap.c b/app/src/behaviors/behavior_mod_tap.c
new file mode 100644
index 0000000..7684c29
--- /dev/null
+++ b/app/src/behaviors/behavior_mod_tap.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#define DT_DRV_COMPAT zmk_behavior_mod_tap
+
+#include <device.h>
+#include <drivers/behavior.h>
+#include <logging/log.h>
+
+#include <zmk/events.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+struct behavior_mod_tap_config { };
+struct behavior_mod_tap_data {
+  u16_t pending_press_positions;
+};
+
+static int behavior_mod_tap_init(struct device *dev)
+{
+	return 0;
+};
+
+
+static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t mods, u32_t keycode)
+{
+  struct behavior_mod_tap_data *data = dev->driver_data;
+  LOG_DBG("mods: %d, keycode: %d", mods, keycode);
+  WRITE_BIT(data->pending_press_positions, position, true);
+  return zmk_events_modifiers_pressed(mods);
+}
+
+
+// They keycode is passed by the "keymap" based on the parameter created as part of the assignment.
+static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t mods, u32_t keycode)
+{
+  struct behavior_mod_tap_data *data = dev->driver_data;
+  LOG_DBG("mods: %d, keycode: %d", mods, keycode);
+  
+  zmk_events_modifiers_released(mods);
+  if (data->pending_press_positions & BIT(position)) {
+    zmk_events_keycode_pressed(keycode);
+    k_msleep(10);
+    zmk_events_keycode_released(keycode);
+  }
+
+  return 0;
+}
+
+static int on_keycode_pressed(struct device *dev, u32_t keycode)
+{
+  struct behavior_mod_tap_data *data = dev->driver_data;
+  data->pending_press_positions = 0;
+  LOG_DBG("pressing: %d", keycode);
+  return 0;
+}
+
+
+static int on_keycode_released(struct device *dev, u32_t keycode)
+{
+  LOG_DBG("releasing: %d", keycode);
+  return 0;
+}
+
+static const struct behavior_driver_api behavior_mod_tap_driver_api = {
+  // These callbacks are all optional, and define which kinds of events the behavior can handle.
+  // They can reference local functions defined here, or shared event handlers.
+  .binding_pressed = on_keymap_binding_pressed,
+  .binding_released = on_keymap_binding_released,
+  .keycode_pressed = on_keycode_pressed,
+  .keycode_released = on_keycode_released
+  // Other optional callbacks a behavior can implement
+  // .on_mouse_moved
+  // .on_sensor_data - Any behaviour that wants to be linked to a censor can implement this behavior
+};
+
+
+static const struct behavior_mod_tap_config behavior_mod_tap_config = {};
+
+static struct behavior_mod_tap_data behavior_mod_tap_data;
+
+DEVICE_AND_API_INIT(behavior_key_press, DT_INST_LABEL(0), behavior_mod_tap_init,
+                    &behavior_mod_tap_data,
+                    &behavior_mod_tap_config,
+                    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
+                    &behavior_mod_tap_driver_api);