date: 2016-03-27
Having acquired a sparkfun buspirate recently to check out a router that no longer works, which is still a brick by the way…
I’ve turned my attention back towards my 3d printers and I’ve a little problem in that I’m unsure which firmware and which settings I compiled and uploaded. So I have a plan which is to backup the firmware from my working device, hash the hex files and compare to the three or four other options that I may have flashed to it.
I have some spare boards that I will be testing methods against first before I dare upset the printer. When I started my adventure into the painful world of 3d printing, the chipsets were at mega128 and 644p. the usb tiny isp was quite happy to burn the boot loaders for these fella’s. but today we have more than 64k to play with and so I need something else.
Thankfully I can leverage my new buspirate to talk SPI. One pain in the arse is that the sparkfun edition has its colour theme backwards. Therefore I will have the details in this blog for my own future reference.
GND Black
+3.3v White
+5v Grey
ADC Purple
VPU Blue
AUX Green
CLK Yellow
MOSI Orange
CS Red
MISO Brown
So by hooking up the bus pirate to the arduino 6 pin header like below;
Black/GND > GND Bottom Left
Red/CS > Reset Top Left
Orange/Mosi > Mosi Bottom Middle
Brown/Miso > Miso Top Right
| Yellow/SCL | CLK > SCK Top Middle |
I power the board by its USB.
I change directory to c:\arduino-1.0.1\hardware\tools\avr
and then run this command;
bin\avrdude.exe -C etc\avrdude.conf -p m1284px -c buspirate -P com11
because for some reason my board has a different ID, I edited my conf file by copying the existing m1284p section and tweak to my boards ID. So now to read the from the device I use the following command;
bin\avrdude.exe -C etc\avrdude.conf -p m1284px -c buspirate -P com11 -U flash:r:c:\factory_sanguino.hex:i
Its slow, like half an hour slow… 70minutes actually, that’s painful, and i never got the file so something was wrong with the path. perhaps try %temp% in future i suspect the : maybe cause.
In addition to flash after the -U switch, there is also eeprom, hfuse, lfuse and efuse data that can be read, the next section ‘r’ can be changed for w to write, the next section is the path to the file, and the ‘i’ I’m not sure about. arduino ide 1.05 seems to have buspirate support builtin.
Ref: http://forum.arduino.cc/index.php?topic=182849.0
Update… no make sure to update all software and firmware. Well the buspirate firmware was on 5.1 and it’s now at 6.1, but that made no difference to the speed using avrdude in the arduino ide 1.01 package. So I updated to arduino ide 1.6.8 and now it takes 154seconds to read the flash.
Just pull out relevant package, my hardware is v3 so I extracted BPv3-firmware. Console into the buspirate and put into bootloader mode using dollar symbol $, close the console and run BPv3-update-v6.1.bat.
Ref: https://www.arduino.cc/download_handler.php
So back to the problem with my sanguinololu boards (I wouldn’t recommend these boards anymore because support seems to be non existant past arduino ide 1.01 buy ramps kit instead) So thanks to the post at http://www.dragonflydiy.com/p/installing-arduino-software.html which linked me to https://github.com/jmgiacalone/sanguino1284p So I can grab the bootloader hex file, the post here http://reprap.org/wiki/Gen7_Arduino_IDE_Support show how to use avrdude on the cli to write the fuses and bootloader.
I’m still getting an error when attempting to backup these devices, so i’m going to continue to the writing stage to see if it helps.
c:\arduino-1.6.8\hardware\tools\avr>bin\avrdude.exe -C etc\avrdude.conf -p m1284p -c buspirate -P com11 -U flash:r:backup_sanguino.hex:i
Attempting to initiate BusPirate binary mode…
avrdude.exe: AVR device initialized and ready to accept instructions
Reading ################################################## 100% 0.09s avrdude.exe: Device signature = 0x1e9705
avrdude.exe: reading flash memory:
Reading ################################################## 99% 154.10sBusPirate: Paged Read command returned zero.
The two spare sanguinololu boards are both surface mounted boards, however they both have different fuses.
c:\arduino-1.6.8\hardware\tools\avr>bin\avrdude.exe -C etc\avrdude.conf -p m1284p -c buspirate -P com11 ?
Attempting to initiate BusPirate binary mode…
avrdude.exe: AVR device initialized and ready to accept instructions
Reading ################################################## 100% 0.09s avrdude.exe: Device signature = 0x1e960a
avrdude.exe: safemode: Fuses OK (H:FD, E:DC, L:FF)
avrdude.exe done. Thank you.
c:\arduino-1.6.8\hardware\tools\avr>bin\avrdude.exe -C etc\avrdude.conf -p m1284p -c buspirate -P com11 ?
Attempting to initiate BusPirate binary mode…
avrdude.exe: AVR device initialized and ready to accept instructions
Reading ################################################## 100% 0.09s avrdude.exe: Device signature = 0x1e9705
avrdude.exe: safemode: Fuses OK (H:FF, E:9A, L:FF)
avrdude.exe done. Thank you.
Set fuses as
Low 0xD6
High 0xDC
Ext 0xFD
# write fuses
bin\avrdude -C etc\avrdude.conf –c buspirate -p m1284p -P com11 \
-B 5 -U lfuse:w:0xD6:m -U hfuse:w:0xDC:m -U efuse:w:0xFD:m
\# upload bootloader from [https://github.com/maniacbug/mighty-1284p/blob/master/bootloaders/optiboot/optiboot\_atmega1284p.hex](https://github.com/maniacbug/mighty-1284p/blob/master/bootloaders/optiboot/optiboot_atmega1284p.hex "https://github.com/maniacbug/mighty-1284p/blob/master/bootloaders/optiboot/optiboot_atmega1284p.hex")
bin\\avrdude -C etc\\avrdude.conf -c buspirate -p m1284p -P com11 \\
-B 1 -U flash:w:optiboot\_atmega1284p.hex
# lock the bootloader (omitted this part)
# this gives an expected “verification error 0xcf != 0x0f”
bin\avrdude -C etc\avrdude.conf -c buspirate -p m1284p -P com11 \
-B 1 -U lock:w:0xCF:m
Seems that did not help, still get paged read zero. frustrating given that I can write a firmware and verify it ok, but not just plain read the flash, seems like a bug to me. Guess that means I cannot verify what is flashed to a device. I suspect the board with the bad signature is bricked.
Well after spending all day it seems the solution is simple, compile what you think is installed on the device and use the verify option. ```
c:\arduino-1.6.8\hardware\tools\avr>bin\avrdude -C etc\avrdude.conf -p m1284p -P com11 -U flash:v:Sprinter.hex:i -c buspirate
Well thats enough meandering for today.