don't start flasher if already started

graphics/core.lua

@@ -7,7 +7,7 @@ local flasher = require("graphics.flasher")
 
 local core = {}
 
-core.version = "1.0.0"
+core.version = "1.0.1"
 
 core.flasher = flasher
 core.events = events

graphics/flasher.lua

@@ -43,8 +43,10 @@ end
 
 -- start/resume the flasher periodic
 function flasher.run()
-    active = true
-    callback_250ms()
+    if not active then
+        active = true
+        callback_250ms()
+    end
 end
 
 -- clear all blinking indicators and stop the flasher periodic