Add initial touch screen support

CMakeLists.txt

@@ -42,6 +42,7 @@ add_subdirectory(libraries/lvgl)
 add_executable(${PROJECT_NAME}
     source/main.c
     source/lv_ctr_disp.c
+    source/lv_ctr_indev.c
 )
 
 target_include_directories(${PROJECT_NAME} PRIVATE

include/lv_ctr_indev.h

@@ -0,0 +1,48 @@
+
+/**
+ * @file lv_ctr_indev.h
+ *
+ */
+
+#if 1
+
+#ifndef LV_CTR_INDEV_H
+#define LV_CTR_INDEV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#if defined(LV_LVGL_H_INCLUDE_SIMPLE)
+#include "lvgl.h"
+#else
+#include "lvgl/lvgl.h"
+#endif
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_ctr_indev_init(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_CTR_INDEV_H*/
+
+#endif /*Disable/Enable content*/

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

source/main.c

@@ -4,6 +4,12 @@
 #include <3ds.h>
 #include "lvgl.h"
 #include "lv_ctr_disp.h"
+#include "lv_ctr_indev.h"
+
+
+static lv_obj_t * cursor;
+static lv_obj_t * label;
+static lv_obj_t * label2;
 
 
 long unsigned int sys_tick(void)
@@ -23,16 +29,59 @@ void sys_free(void)
     gfxExit();
 }
 
+static void cursor_timer_cb(lv_timer_t * t)
+{
+    LV_UNUSED(t);
+
+    lv_indev_t * indev = lv_indev_get_next(NULL);
+
+    if (!indev)
+        return;
+
+    lv_point_t p;
+    lv_indev_get_point(indev, &p);
+
+    if (lv_indev_get_state(indev) == LV_INDEV_STATE_PRESSED) {
+
+        lv_obj_set_pos(cursor, p.x - 5, p.y - 5);
+        lv_obj_clear_flag(cursor, LV_OBJ_FLAG_HIDDEN);
+
+        lv_label_set_text_fmt(label2,
+            "x: %d\ny: %d",
+            p.x,
+            p.y);
+    }
+    else {
+        lv_obj_add_flag(cursor, LV_OBJ_FLAG_HIDDEN);
+    }
+}
+
 int main(int argc, char* argv[])
 {
     sys_init();
     lv_init();
     lv_ctr_disp_init();
+    lv_ctr_indev_init();
     lv_tick_set_cb(sys_tick);
 
-    lv_obj_t * label = lv_label_create(lv_screen_active());
+    label = lv_label_create(lv_screen_active());
     lv_label_set_text(label, "Hello world");
     lv_obj_center(label);
+    
+    /* Cursor */
+    cursor = lv_obj_create(lv_screen_active());
+    lv_obj_set_size(cursor, 10, 10);
+    lv_obj_set_style_radius(cursor, LV_RADIUS_CIRCLE, 0);
+    lv_obj_set_style_bg_color(cursor, lv_palette_main(LV_PALETTE_RED), 0);
+    lv_obj_set_style_border_width(cursor, 0, 0);
+
+    /* Coord label */
+    label2 = lv_label_create(lv_screen_active());
+    lv_obj_align(label2, LV_ALIGN_TOP_LEFT, 4, 4);
+    
+    /* Main loop UI update timer */
+    lv_timer_create(cursor_timer_cb, 16, NULL);
+    
     lv_obj_invalidate(lv_screen_active());
 
     // Main loop