Re: Sanguinololu 1.3a, Marlin 1.1.9

Hi Guys.

For everyone who wanna upgrade the firmware in a 3D Printer with sanguinololu board.
Follow some tips.
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If you receive one error like this:
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x40
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x40
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I believe that the problem is because some sanguinololu boards have old boot_loaders,
they can communicate in 115200 but can not upload at this speed.

To fix the communication problems you need change the upload speed for 57600.
===================================================================
Just go to the directory/file:
>> C:\Program Files (x86)\Arduino\hardware\Sanguino-master\avr\boards.txt
and change the upload speed in the line:
from:
>> sanguino.menu.cpu.atmega1284p_8m.upload.speed=115200
to:
>> sanguino.menu.cpu.atmega1284p_8m.upload.speed=57600

Attention:
=========================================================
1 - I believe you can update your boot_load to fix it, but it is another history.

2 - Do not change the directory/file:
>> C:\Program Files (x86)\Arduino\hardware\Sanguino-master\boards.txt
it will not fix the problem.

I spend almost a full day to fix it because the file above.
=========================================================

The software version:

Arduino IDE version 1.8.8 (https://www.arduino.cc/en/Main/Software)
Sanguino-master last version (https://github.com/Lauszus/Sanguino) (2018-12-12)
Marlin version 1.1.9 (http://marlinfw.org/meta/download/)

Arduino IDE setup:
> Tools
>> Board: "Sanguino"
>> Processor: "ATMega 1284 or AtMega 1284P (16 MHz)"
>> Port: "COM7" (for my board)
>> Programmer: "ArduinoISP"

Just do not forgive to hold the reset buttom in the sanguinololu board.
You need hold it pressed during the compilation process until the start of the upload process in the arduino IDE.
Worked for me.

Kind regards Juan.