improve u8g lua examples

lua_examples/u8glib/u8g_bitmaps.lua

@@ -61,7 +61,33 @@ function draw(draw_state)
 end
 
 
-function bitmap_test(delay)
+function bitmap_test()
+    dir = 0
+    next_rotation = 0
+
+    disp:firstPage()
+    repeat
+        draw(draw_state)
+    until disp:nextPage() == false
+
+    if (draw_state <= 7 + 1*8) then
+        draw_state = draw_state + 1
+    else
+        print("--- Restarting Bitmap Test ---")
+        draw_state = 1
+    end
+
+    print("Heap: " .. node.heap())
+    -- retrigger timer to give room for system housekeeping
+    tmr.start(0)
+
+end
+
+draw_state = 1
+
+init_i2c_display()
+--init_spi_display()
+
 -- read XBM picture
 file.open("u8glib_logo.xbm", "r")
 xbm_data = file.read()
@@ -72,24 +98,9 @@ function bitmap_test(delay)
 bm_data = file.read()
 file.close()
 
+
+-- set up timer 0 with short interval, will be retriggered in graphics_test()
+tmr.register(0, 100, tmr.ALARM_SEMI, function() bitmap_test() end)
+
 print("--- Starting Bitmap Test ---")
-     dir = 0
-     next_rotation = 0
-
-     local draw_state
-     for draw_state = 1, 7 + 1*8, 1 do
-          disp:firstPage()
-          repeat
-               draw(draw_state)
-          until disp:nextPage() == false
-
-          tmr.delay(delay)
-          tmr.wdclr()
-     end
-
-     print("--- Bitmap Test done ---")
-end
-
---init_i2c_display()
-init_spi_display()
-bitmap_test(50000)
+tmr.start(0)

lua_examples/u8glib/u8g_graphics_test.lua

@@ -134,25 +134,32 @@ function draw(draw_state)
     end
 end
 
-function graphics_test(delay)
-     print("--- Starting Graphics Test ---")
+function graphics_test()
 
-     -- cycle through all components
-     local draw_state
-     for draw_state = 0, 7 + 8*8, 1 do
     disp:firstPage()
     repeat
         draw(draw_state)
     until disp:nextPage() == false
-          --print(node.heap())
-          tmr.delay(delay)
-          -- re-trigger Watchdog!
-          tmr.wdclr()
+
+    if (draw_state <= 7 + 8*8) then
+        draw_state = draw_state + 1
+    else
+        print("--- Restarting Graphics Test ---")
+        draw_state = 0
     end
 
-     print("--- Graphics Test done ---")
+    print("Heap: " .. node.heap())
+    -- retrigger timer to give room for system housekeeping
+    tmr.start(0)
 end
 
---init_i2c_display()
-init_spi_display()
-graphics_test(50000)
+draw_state = 0
+
+init_i2c_display()
+--init_spi_display()
+
+-- set up timer 0 with short interval, will be retriggered in graphics_test()
+tmr.register(0, 100, tmr.ALARM_SEMI, function() graphics_test() end)
+
+print("--- Starting Graphics Test ---")
+tmr.start(0)