Add initial touch screen support

source/lv_ctr_indev.c

@@ -0,0 +1,90 @@
+/**
+ * @file lv_ctr_indev.c
+ *
+ */
+
+#if 1
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_ctr_indev.h"
+#include <3ds.h>
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+static void touchpad_read(lv_indev_t * indev, lv_indev_data_t * data);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+lv_indev_t * indev_touchpad;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+void lv_ctr_indev_init(void)
+{
+    /*Register a touch screen input device*/
+    indev_touchpad = lv_indev_create();
+    lv_indev_set_type(indev_touchpad, LV_INDEV_TYPE_POINTER);
+    lv_indev_set_read_cb(indev_touchpad, touchpad_read);
+
+    /*Later you should create group(s) with `lv_group_t * group = lv_group_create()`,
+     *add objects to the group with `lv_group_add_obj(group, obj)`
+     *and assign this input device to group to navigate in it:
+     *`lv_indev_set_group(indev_keypad, group);`*/
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/*------------------
+ * Touchpad
+ * -----------------*/
+
+static void touchpad_read(lv_indev_t * indev_drv, lv_indev_data_t * data)
+{
+    static int32_t last_x = 0;
+    static int32_t last_y = 0;
+    touchPosition touch;
+    
+    hidScanInput();
+
+    /*Save the pressed coordinates and the state*/
+    if(hidKeysHeld() & KEY_TOUCH) {
+        hidTouchRead(&touch);
+        last_x = touch.px;
+        last_y = touch.py;
+        data->state = LV_INDEV_STATE_PRESSED;
+    }
+    else {
+        data->state = LV_INDEV_STATE_RELEASED;
+    }
+
+    /*Set the last pressed coordinates*/
+    data->point.x = last_x;
+    data->point.y = last_y;
+}
+
+#else /*Enable this file at the top*/
+
+/*This dummy typedef exists purely to silence -Wpedantic.*/
+typedef int keep_pedantic_happy;
+#endif