This is as yet untested in a printer, but it appears to have worked.
Downloaded latest ArduinoIDE 1.69. In that version, under files/preferences you can set additional URLs to keep board information up to date.
I used [raw.githubusercontent.com] which meant I saw Sanguino as a board option in the IDE.
But I was unable to compile to the board, it failed to sync when I chose the Sanguino board and selected "ATMega1284 or 1284P (16Mhz).
I then modified the Boards.txt on line 78 to read "sanguino.menu.cpu.atmega1284p.upload.speed=57600" instead of 115200. This gave me sync with the board and I was able to upload Blink, but without any LED to blink this was pretty pointless. When I tried Marlin I received a "dunno what board this is" type error.
Then I tried the T3P3 Marlin fork.
I copied the T3P3 Sanguino folder across to C:\Program Files (x86)\Arduino\hardware\arduino\avr\sanguino It would not work correctly in any of the folders above this path.
With the configuration.h modified to suit my printer (I hope) I was able to compile and upload was reported complete with no errors.
Unfortunately the printer it is about to go into has completely different connections, so I won't be able to confirm until I can rejig it.
Hope that helps though.
Downloaded latest ArduinoIDE 1.69. In that version, under files/preferences you can set additional URLs to keep board information up to date.
I used [raw.githubusercontent.com] which meant I saw Sanguino as a board option in the IDE.
But I was unable to compile to the board, it failed to sync when I chose the Sanguino board and selected "ATMega1284 or 1284P (16Mhz).
I then modified the Boards.txt on line 78 to read "sanguino.menu.cpu.atmega1284p.upload.speed=57600" instead of 115200. This gave me sync with the board and I was able to upload Blink, but without any LED to blink this was pretty pointless. When I tried Marlin I received a "dunno what board this is" type error.
Then I tried the T3P3 Marlin fork.
I copied the T3P3 Sanguino folder across to C:\Program Files (x86)\Arduino\hardware\arduino\avr\sanguino It would not work correctly in any of the folders above this path.
With the configuration.h modified to suit my printer (I hope) I was able to compile and upload was reported complete with no errors.
Unfortunately the printer it is about to go into has completely different connections, so I won't be able to confirm until I can rejig it.
Hope that helps though.