update README.md

README.md

@@ -12,18 +12,17 @@ https://github.com/plan44/messagetorch
 This code is built for 5m LED strip with 64 led/m. The circumference of the
 tube is about 17-20 cm, so that after 12 leds one winding is complete.
 
-This is an arduino sketch, however, there are two small issues with this:
+Originally there were some funky problems since for larger numbers of LEDs the
+rendering code tends to interfere with the bootloader activation since the
+"Catarina" Bootloader relies on some values in very specific memory locations
+to decide if it starts the main application or not. This value was prone to get
+clobbered by the flame rendering code, in extreme cases it even required to
+reflash your leonardo via ISP.
 
-It needs a patched Adafruit-Neopixel library, where I extended the
-constructor with a pointer to pre-allocated memory. That way I get some
-control on where in the memory the framebuffer is residing.
-
-Also, the memory in the arduino leonardo for 320 LEDs is tight. It tends
-to interfere with the bootloader activation since the "Catarina"
-Bootloader relies on some values in very specific memory locations to
-decide if it starts the main application or not. This value sometimes
-gets clobbered by the flame rendering code, in extreme cases it might be
-necessary to reflash your leonardo via ISP.
+I now have implemented a somewhat ugly workaround. By strategically dis- and
+re-enabling interrupts and checking for the bootloader-entering-condition at
+the beginning of loop() the code now makes entering the bootloader via the IDE
+a lot more reliable.
 
 I tried to keep the code clean and have the most important values as
 defines, so that it can be adjusted to different led layouts.