Updating the README file

- Adding some output example from the tools
- Reformating a bit to add a Known bug section listing all the found buf up so far.

README.md

@@ -15,28 +15,68 @@ An effort to find how the Bluetooth is workind is also underway but too early to
 all I can say is that it use BLE.
 
 The [update_files](update_files) folder include all the known update file released by MinBay.  
-
 The [sample_tools](sample_tools) folder include sample application in python handling the different 
 type of file related to the MB701.
 
-### Quick note about updating your MB701
+### Output example
-About update, **DO NOT** try to update the MB701 using anything else than a PC under windows, and 
+
-potentially linux. The way they handle FAT is weird and Mac OS seems to have issues with saving 
+![P0002_18.png](samples/P0002_18.png) ![P0002_18.gif](samples/P0002_18.gif)  
-the update file properly leading the board to crash in weird way. 
+P0002_18 - Artist: Unknown (Minbay?)
 
 ### TODO
  - [ ] Documenting the update file format
  - [ ] Documenting the BLE protocol
  - [X] Creating a sample tool to create animated an gif from a .dat file
- - [ ] Finish the pixb2img to crop image if wanted (it only show imaged in their full 32x32 format)
+ - [ ] Finish the pixb2img to crop image if wanted (it only shows imaged in their full 32x32 format)
  - [ ] Hardware documentation, there is definitely a serial port and other port on the board.
  - [ ] Maybe add datasheet of the components used on the board.
  - [ ] Find how they draw straigh lines and circle to have an exact match.
 
 ## Note
-This repository is obviously not related in anyway with MinBay the creators of the MB701.
+This repository is obviously not related in any way with MinBay the creators of the MB701.
 
 For more information about the MB701 and MinBay go do their website: https://minbay.com
 
 If you have any information missing in this repository, feel free to contact me, especially if you have firmware that 
 I did not manage to save from their website and saved here.
+
+## MB701 known bugs
+
+ ### 1 - Pixel tool overflow
+
+#### Explanation
+
+Using the normal pixel drawing tool, drawing too many pixels in a single stroke can lead to at least two possible outcome
+1. the artboard will crash and force you to power cycle it
+2. the history will not work properly, and you will not be able to properly undo/redo the stroke.
+
+#### Reason
+
+Considering how is made the current version of the PTCR format, it can only store 255 pixel per stroke, so having more 
+pixel than this number may generate a buffer overflow at some point, this need to be confirmed with the reverse 
+engineering of the main software, but with really long stroke crash has been consistent.
+Smaller but more than ~200 pixels stroke do lead to problem with the history.
+
+Also considering that some history files provided with the artboard do have error in the pixel count on some long 
+stroke, it is likely they also store this number with a non 8bit cap and the value do roll-over and create counting issues.
+
+| Discoverd  | Affected firmware | Fixed on Version |
+|------------|-------------------|------------------|
+| 17/11/2022 | All known         | N/A              |
+
+ ### 2 - Update not working properly with Mac OS
+
+#### Explanation
+
+Copying an update file to the MB701 from a Mac OS based system will not work, properly the file copy finish without any error
+but the artboard will crash when it is ejected.
+Doing the same thing from a windows system do not crash the board.
+
+#### Reason
+
+Unclear at the moment, but probably linked with the way show a FAT filesystem to the USB as I think it does not use a
+native FAT internally.
+
+| Discoverd  | Affected firmware | Fixed on Version |
+|------------|-------------------|------------------|
+| 01/11/2022 | All known         | N/A              |