Squash of branch setup

main/common/queue_defs.h

@@ -0,0 +1,31 @@
+#pragma once
+#include <indev/lv_indev.h>
+
+typedef enum {
+  CMD_DISPLAY_UPDATE,
+  CMD_SAVE_DATA,
+  CMD_LOAD_DATA,
+  CMD_REFRESH_DISPLAY,
+  CMD_SYSTEM_STATUS,
+} cmd_type_t;
+
+typedef struct {
+  cmd_type_t type;
+  uint32_t id;
+  void* data;
+  size_t len;
+  QueueHandle_t reply_to;  // NULL if one-way
+} async_cmd_t;
+
+extern QueueHandle_t command_queue;
+
+typedef struct {
+  uint16_t x, y;
+  lv_indev_state_t state;  // LV_INDEV_STATE_PR/REL
+  uint32_t timestamp;
+  uint8_t gesture;         // TAP, SWIPE, LONG_PRESS
+} touch_event_t;
+
+extern QueueHandle_t touch_queue;
+
+extern EventGroupHandle_t system_event_group;