avrdude on RasPi Zero only works once

Log in or register to post comments
Go To Last Post
15 posts / 0 new
Author
Message
MalphasWats
MalphasWats's picture
Level: Hangaround
Joined: Mon. Apr 30, 2018
Posts: 131 View posts
#1
Posted by MalphasWats: Sun. May 6, 2018 - 08:17 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi,

I'm trying to set a Raspberry Pi Zero up as a mobile dev tool.

After a few false starts I have everything set up and I can program an ATTiny85 via SPI and the GPIO pins.

Once - it will flash the program once, and then fail with the error:

avrdude: verification error, first mismatch at byte 0x0000<br />
    0xff != 0x0e<br />
avrdude: verification error; content mismatch

If I reboot the Pi, it will work again, but still only once until another reboot.

All of my avrdude config files are default, I have a 1uF capacitor between GND & VCC, and 10k resistor between VCC and RESET on the ATTiny, calling avrdude with this:

<br />
$ sudo avrdude -P /dev/spidev0.0 -c linuxspi -p t85 -U flash:w:blinky.hex<br />

Any ideas?

Thanks
-Mike

This topic has a solution.

Tags:

Tools, In-System Debuggers and Programmers, solved, avrdude, Raspberry Pi, macOS, iOS, ATtiny85
Last Edited: Mon. May 7, 2018 - 04:53 PM
Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Sun. May 6, 2018 - 09:04 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Is there a way to do a devfs reset on just spidev?

 

"Dare to be naïve." - Buckminster Fuller

Top
MalphasWats
MalphasWats's picture
Level: Hangaround
Joined: Mon. Apr 30, 2018
Posts: 131 View posts
Posted by MalphasWats: Sun. May 6, 2018 - 09:27 PM (Reply to #2)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I'm not sure, but I tried disabling it completely with raspi-config, and then re-enabling it and that had no effect - I got a different error after I disabled it (Unable to open SPI port..., as expected) and then the same error as before when I re-enabled it.

 

I also tried lsmod to find the spi module name (spidev), then rmmod spidev to remove it, mod probe spidev to put it back (which I think is the same as what raspi-config does anyway), still to no avail.

Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Sun. May 6, 2018 - 09:59 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

MalphasWats wrote:
I'm trying to set a Raspberry Pi Zero up as a mobile dev tool.
Also as headless and an AVR for real-time.

Have you considered Android?

Reasons :

  • AVRDUDE has been ported to Android
  • One or more threads here about AVR GCC toolchain on Android
  • Android apps on Chrome OS

 

YouTube

Zflasher AVR + USBtiny

https://www.youtube.com/watch?v=-Gh5i7FFv9k (1m44s)

Android app on AppBrain

ZFlasher AVR

https://www.appbrain.com/app/zflasher-avr/ru.zdevs.zflasheravr

 

"Dare to be naïve." - Buckminster Fuller

Top
MalphasWats
MalphasWats's picture
Level: Hangaround
Joined: Mon. Apr 30, 2018
Posts: 131 View posts
Posted by MalphasWats: Sun. May 6, 2018 - 10:12 PM (Reply to #4)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Thanks, unfortunately I'm all in on Apple - iPhone, iPad & iMac. Terminal app on all and a spare raspiPi. I'm trying to move away from the Arduino IDE and figured I'd set up a self contained system. This particular problem is particularly frustrating because it works! But then it doesn't :(

Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Sun. May 6, 2018 - 10:32 PM (Reply to #5)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

macOS -

AVRDUDE's on macOS, Microchip has an AVR GCC toolchain on macOS, and there's embedXcode and Microsoft Visual Studio Code with an AVR extension.

oh ... iMac is the desktop Mac.

 

iOS - that would be completely mobile.  May be worthwhile to search for AVR apps.

 

http://savannah.spinellicreations.com/avrdude/AtmelICE-kext-for-High-Sierra.readme.txt via http://download.savannah.gnu.org/releases/avrdude/

http://distribute.atmel.no/tools/opensource/Atmel-AVR-GNU-Toolchain/3.6.1/

https://embedxcode.weebly.com/

AVR Studio On Mac & Linux?

by ka7ehk

https://www.avrfreaks.net/forum/avr-studio-mac-linux

 

Edit: oh

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Sun. May 6, 2018 - 10:38 PM
Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Sun. May 6, 2018 - 10:47 PM (Reply to #5)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

MalphasWats wrote:
This particular problem is particularly frustrating because it works! But then it doesn't :(
Willing to move to linux gpio?

Reasons :

  • linuxspi may not be operated by many AVRDUDE operators (linuxspi may be defective)
  • linux gpio fixes in AVRDUDE

 

forthcoming AVRDUDE 6.4 :

http://svn.savannah.gnu.org/viewvc/avrdude/trunk/avrdude/NEWS?revision=1425&view=markup

...

* Bugfixes:
42 bug #47550: Linux GPIO broken

...

 

"Dare to be naïve." - Buckminster Fuller

Top
MalphasWats
MalphasWats's picture
Level: Hangaround
Joined: Mon. Apr 30, 2018
Posts: 131 View posts
This reply has been marked as the solution. 
Posted by MalphasWats: Mon. May 7, 2018 - 04:52 PM (Reply to #5)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

Solved it!

 

My hinky breadboard/jumper wires set up wasn't working at whatever default clock speed avrdude uses. I slowed it down with the -b parameter and it now works reliably (I only wish I'd tried this before I tried rebuilding the raspberry pi from a fresh image, but hey ho).

 

-b 19200 was too fast, but -b 14400 worked ok (I started at -b 2400 and worked my way up until it stopped working!)

 

so this works:

 

$ sudo avrdude -b 14400 -P /dev/spidev0.0 -c linuxspi -p t85 -U flash:w:blinky.hex

 

I have no idea why it would work once after reboot and then not again, but I'm not actually that clever anyway so it's not surprising.

 

Thank you for your efforts :)

Last Edited: Mon. May 7, 2018 - 04:54 PM
Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Mon. May 7, 2018 - 05:41 PM (Reply to #8)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Well done!

... and good to know (didn't know linuxspi existed)

MalphasWats wrote:
I slowed it down with the -b parameter and it now works reliably ...
SPI has very short rise and fall times so ground bounce and overshoot are likely; some AVR ISP have a 100 ohm resistor between the ISP AVR and the target AVR.

Another concern is a possible mis-match between the Raspberry Pi I/O voltage and the target AVR's VCC; for CMOS-to/from-CMOS, some mis-match is OK but not a lot.

Might consider adding a level translator between the Raspberry Pi and the AVR.

 

https://www.olimex.com/Products/AVR/Programmers/AVR-ISP-MK2/resources/AVR-ISP-MK2_sch.pdf (top center)

SparkFun Electronics

Level Shifters

https://www.sparkfun.com/categories/361

 

"Dare to be naïve." - Buckminster Fuller

Top
MalphasWats
MalphasWats's picture
Level: Hangaround
Joined: Mon. Apr 30, 2018
Posts: 131 View posts
Posted by MalphasWats: Mon. May 7, 2018 - 06:10 PM (Reply to #9)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Thanks. I was thinking of getting a little board made up for this so I'll look into adding some 'protective' features. It probably doesn't help that the whole thing is breadboard and jumper wires at the moment!

Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Mon. May 7, 2018 - 06:30 PM (Reply to #10)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

MalphasWats wrote:
I was thinking of getting a little board made up for this so I'll look into adding some 'protective' features.
If I read it correctly, Raspberry Pi I/O is at 3.3V so a 5V AVR would be a problem.

MalphasWats wrote:
It probably doesn't help that the whole thing is breadboard and jumper wires at the moment!
There are Pi Hat protoboards.

 

Raspberry Pi Documentation

GPIO

https://www.raspberrypi.org/documentation/hardware/raspberrypi/gpio/README.md

...

 

Overview

...

Each of the three banks has its own VDD input pin. On Raspberry Pi, all GPIO banks are supplied from 3.3V. Connection of a GPIO to a voltage higher than 3.3V will likely destroy the GPIO block within the SoC.

...

Schmartboard, Inc.

Schmartboard

Raspberry Pi - Pi Zero Boards

http://schmartboard.com/raspberry-pi/pi-zero/

 

"Dare to be naïve." - Buckminster Fuller

Top
MalphasWats
MalphasWats's picture
Level: Hangaround
Joined: Mon. Apr 30, 2018
Posts: 131 View posts
Posted by MalphasWats: Sat. May 12, 2018 - 08:14 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

gchapman wrote:

MalphasWats wrote:
It probably doesn't help that the whole thing is breadboard and jumper wires at the moment!

There are Pi Hat protoboards.

 

I bought one! And I soldered it all up and it works a treat - I experimented with the baud rate and it will mostly work at the default 400,000, but it needs the chip to be plugged into the socket really firmly and I always bend the pins taking it out again. 200,000 seems to be a little less picky and is still WAY faster than 14,000.

 

I've developed a new problem though. I've also since made a nice Makefile for my project and as part of that I realised that avrdude needed to run as sudo in order to access /dev/spidev0.0 and I wasn't completely comfortable hiding a sudo command in a Makefile, so I chmod'd /dev/spidev0.0 to give read/write to all users (before I realised I could have just added my user to the spi group).

 

This works, but only the second time I run avrdude. The first time I run it, I get this error:

 

avrdude: linuxspi_gpio_op_wr(): Unable to open file /sys/class/gpio/gpio25/direction

 

if I run it again, it works fine, then the next time I run it, it gives the error again. /sys/class/gpio/gpio25/direction doesn't exist, nor does the folder gpio25, so I assume it is being created and deleted by avrdude each run, so I set the permissions for /sys/class/gpio to give read/write access to all, but something changed it back again so that doesn't work. It's owned by root/gpio so I've made sure my user is in the gpio group but that didn't help.

 

Any ideas welcome, my linux foo is only yellow/gold belt, so I'm all out of 'em (well, I thought I could put the avrdude command in my Makefile twice, but that felt like a Bad idea).

 

EDIT: I've also just noticed that /dev/spidev0.0 has also had its permissions reset. Changing them back to 0666 hasn't helped.

Last Edited: Sat. May 12, 2018 - 08:23 PM
Top
gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 11200 View posts
Location: Arlington, Texas, u.S.A.
Posted by gchapman: Sat. May 12, 2018 - 08:46 PM (Reply to #12)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

MalphasWats wrote:
... and I always bend the pins taking it out again.
DIP extractor, pull straight up, DIP pin straightener when goof the pull.

Consider a ZIF socket if programming "a lot".

fyi, late model AVR are SMD only; consider replacing DIP with SOIC as these also have sockets.

MalphasWats wrote:
if I run it again, it works fine, then the next time I run it, it gives the error again.
A guess is a defect in AVRDUDE; review its source code to confirm or deny the defect.

 

https://www.jameco.com/z/08-609-HT103A--IC-Extractor-DIP-Tool_16838.html (browse up one level to see the pin straightener)

http://www.proto-advantage.com/store/index.php?cPath=3600 (Socket to DIP) (PLCC, SOIC)

https://www.mouser.com/Connectors/IC-Component-Sockets/_/N-211lk?Keyword=Connectors+IC+Component+Sockets&FS=True (Product menu, scroll to ZIF)

 

"Dare to be naïve." - Buckminster Fuller

Top
Kartman
Kartman's picture
Level: 10k+ Postman
Joined: Thu. Dec 30, 2004
Posts: 22788 View posts
Location: Melbourne,Australia
Posted by Kartman: Sun. May 13, 2018 - 01:03 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Rather than futz with the raspi's gpio, just get a cheapy usb isp adapter (usbasp). Level translation taken care of. Problem solved for probably $2 usd.

Top
chrisstjohn
chrisstjohn's picture
Level: New Member
Joined: Fri. Mar 1, 2019
Posts: 1 View posts
Posted by chrisstjohn: Fri. Oct 11, 2019 - 03:48 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

At the risk of waking zombie threads, a solution to this (without rebuilding avrdude) is to export gpio25 before programming:

 

$ [ -d /sys/class/gpio/gpio25 ] || echo 25 >/sys/class/gpio/export
$ avrdude -P /dev/spidev0.0 -c linuxspi -p m164p

 

Good luck!

Chris

Top