update asserts

examples/widgets/btnmatrix/lv_example_btnmatrix_1.c

@@ -0,0 +1,31 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_BTNMATRIX
+
+static void event_handler(lv_obj_t * obj, lv_event_t event)
+{
+    if(event == LV_EVENT_VALUE_CHANGED) {
+        uint32_t id = lv_btnmatrix_get_active_btn(obj);
+        const char * txt = lv_btnmatrix_get_btn_text(obj, id);
+
+        printf("%s was pressed\n", txt);
+    }
+}
+
+
+static const char * btnm_map[] = {"1", "2", "3", "4", "5", "\n",
+                                  "6", "7", "8", "9", "0", "\n",
+                                  "Action1", "Action2", ""};
+
+void lv_example_btnmatrix_1(void)
+{
+    lv_obj_t * btnm1 = lv_btnmatrix_create(lv_scr_act(), NULL);
+    lv_btnmatrix_set_map(btnm1, btnm_map);
+    lv_btnmatrix_set_btn_width(btnm1, 10, 2);        /*Make "Action1" twice as wide as "Action2"*/
+    lv_btnmatrix_set_btn_ctrl(btnm1, 10, LV_BTNMATRIX_CTRL_CHECKABLE);
+    lv_btnmatrix_set_btn_ctrl(btnm1, 11, LV_BTNMATRIX_CTRL_CHECKED);
+    lv_obj_align(btnm1, NULL, LV_ALIGN_CENTER, 0, 0);
+    lv_obj_add_event_cb(btnm1, event_handler, NULL);
+}
+
+#endif