first commit

libraries/lvgl/examples/widgets/chart/lv_example_chart_9.py

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+import display_driver
+import lvgl as lv
+
+def add_data(t):
+    chart.set_next_value(ser, lv.rand(10, 90))
+
+    p = chart.get_point_count()
+    s = chart.get_x_start_point(ser)
+    a = chart.get_y_array(ser)
+
+    a[(s + 1) % p] = lv.CHART_POINT.NONE
+    a[(s + 2) % p] = lv.CHART_POINT.NONE
+    a[(s + 3) % p] = lv.CHART_POINT.NONE
+    chart.refresh()
+
+#
+# Circular line chart with gap
+#
+chart = lv.chart(lv.scr_act())
+
+chart.set_update_mode(lv.chart.UPDATE_MODE.CIRCULAR)
+chart.set_size(200, 150)
+chart.center()
+
+chart.set_point_count(30)
+ser = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
+#Prefill with data
+for i in range(0, 30):
+    chart.set_next_value(ser, lv.rand(10, 90))
+
+lv.timer_create(add_data, 200, None)