AtTiny26 problems reading the signature! ISP & HVPP.
Bought 100 pieces.
ISP does not see.
STK 500 confidently reads the signature 0x3f3f3f
tested on 10 pieces randomly. Work control sees everything correctly!
clawson 
STK 500 - OK!
ISP - Ok!
tested on control MS Attini26
***
How to fix the wrong signature ?!
Atmel Studio 7 allows you to record or fix it?
Photo MC can attach.
theusch 
How to fix the wrong signature ?!
For a new chip, you will need to slow down the ISP bit rate to below 250kHz. What ISP bit rate are you using?
Also, sometimes a shorter ISP cable can make a difference( not so much at low speeds).
If possible, be descriptive with full sentences...you're lacking a lot of details:
STK 500 - OK!
ISP - Ok!
tested on control MS Attini26
How do you expect help? ISP - Ok! What exactly do you mean? You also say ISP does not see
Which is it?
.....help given problem solved!!
Wire length to MC from STK500 - 10 Cm.
AtTini 26 can be erased in 30% devisom use Fuse bit doctor!
70% - does not help and he.
The frequency changed from 125 kHz to 3,xx MHz - stable result ==3f3f3f
???
david.prentice AtTiny26 problems reading the signature! ISP & HVPP.
Bought 100 pieces.
ISP does not see.
STK 500 confidently reads the signature 0x3f3f3ftested on 10 pieces randomly. Work control sees everything correctly!
Go on. You have bought 100 twelve year old chips! The ones in your photo look as if they have been unsoldered.
Buying used chips is risky. Buying old chips is risky.
If you are lucky they might be from surplus unused boards. Place in clamshell and program with your STK500.
I would test your STK500 with HVPP on other chips first. The cables are tricky. The STK500 is probably old. Jumper cables are worn / loose.
I hope that you did not pay too much money. Tiny26 would not be a wise chip for a new design.
David.
clawson Do you really have an SSOP to DIP adapter for mounting them in your STK500 ? Otherwise how are you connecting the programmer? Does the same equipment work OK if you use an existing "known good" t26 from your collection?
All chips are 6 years old! Yes old, but not soldered in the tape.
Photo attached for identification, maybe someone such a party was with similar problems.
I have three devices: STK 500, AVR JTAG, Fuse bit doctor - workers!
Atmel Studio 7 (Atmel Studio 6.1) & AVR_dude - workers!
The result is stable == 3f3f3f. Еxternal quartz does not help, as well as changes in frequency.
And programmers read the signature!
There is a good SOP-20 adapter, and 20 pieces are checked for control. The result is one and stable.
Result after Fuse bit doctor ~ 20% MC - Ok, Repair signsture Tiny26 == 0x1E9109
Photo below
Perhaps in Atmel Studio 7 you can write a user signature?
Where to get the file?
As these are second-hand chips, and they are 12 years old (date code 0622 = 22nd week of 2006), might it not be that they have been previously programmed and RST has been disabled along with SPI programming?
As these are second-hand chips, and they are 12 years old (date code 0622 = 22nd week of 2006), might it not be that they have been previously programmed and RST has been disabled along with SPI programming?
Perhaps the question is how to write them quickly and correctly signatures?
Judging by the answers from Atmel Studio (AVR_dude), the chips are working, but they are clean, even chip signatures are seen. But other registers FF, which leads to a Atmel Studio error (possible overflow)...
Question how to fix?
Perhaps the question is how to write them quickly and correctly signatures?
AFAIK there is no facility for a user to write a chip's signature. But I am confused by what EXACTLY your problem is...
Judging by the answers from Atmel Studio (AVR_dude), the chips are working, but they are clean, even chip signatures are seen. But other registers FF, which leads to a Atmel Studio error (possible overflow)...
So are the signatures correctly read or not?
Also, it is generally a bad idea to put chips that have solder on their legs into a chip adapter. It might bend the fragile legs of the adapter making future connections unreliable.
Soldered chips on the adapter!
There are no problems with the panel!
Judging by the attached screen (below) an attempt to read the Lock bit.
the Visual studio is waiting for the signature of the chip: 0x1E9109, receives: 0x003f3f3f
clawson It's not a question of correcting the signatures - that is not the problem. It's simply that when the ISP/HVSP connection does not work right the first thing that shows that is that the readback of the signature fails. So you need to solve whatever the communication issue is.
As they appear to have been desoldered for all you know the original user may have deliberately damaged the programming system in some way (high voltage pulse into one of the programming pins to deliberately damage transistor gates) as a protection to prevent code being read from them (lockbit protection itself is not very secure). So it could be that you may never make them work.
If I was you I'd stop wasting time on these and just buy some modern AVRs and get on with having some fun programming the things.
Have you tried a chip erase command using the HVPP?
It's not a question of correcting the signatures - that is not the problem. It's simply that when the ISP/HVSP connection does not work right the first thing that shows that is that the readback of the signature fails. So you need to solve whatever the communication issue is.
As they appear to have been desoldered for all you know the original user may have deliberately damaged the programming system in some way (high voltage pulse into one of the programming pins to deliberately damage transistor gates) as a protection to prevent code being read from them (lockbit protection itself is not very secure). So it could be that you may never make them work.
If I was you I'd stop wasting time on these and just buy some modern AVRs and get on with having some fun programming the things.
*****
100 PSc ---?
[quote = Брайан Фэрчайлд]
Вы пробовали команду стирания чипа с помощью HVPP?
[/ Цитата]
==>Yes!
~~ 20% of cases helped Fuse bit docktor. Here's how to raise the rest?
Soldered chips on the adapter!
What do you mean by that?
Etnola wrote:
Soldered chips on the adapter!
What do you mean by that?
Brazed - tested on transitional boards!
Not soldered in the panels !.
***
The problem at the beginning of the post and on the screen!
Good advice to toss those chips in the trash & spend $10 on some new chips, or cheapo nano boards. Why suffer for 2 more months trying to wake these chips up?
Then you can get on with your project and enjoy your time. I still occasionally use the tiny26 (my first avr), or really its cousin, the tiny261.
I assume your fuse doctor is HVSP? If the fuses have been changed, a chip erase with HVSP is not sufficient. You'll also need to change the fuses back to factory default. Does your fuse doctor do that? Steps:
After all these steps, are you still unable to recover these t26?
Good advice to toss those chips
EDIT: Note that the default fuses in the datasheet (mentioned above) do not match the default values listed for the t26 at http://www.engbedded.com/fusecalc/. That site claims the default lfuse to be 0xF9. That fuse will select the 'External Low Frequency Oscillator', while also setting the SUT fuses to an undefined 'reserved' value. Further, the site claims that those fuse values select 'PLL Clock', which is also incorrect.
To be clear, the correct default fuse values are lfuse:0xE1, and hfuse:0xF7. This is straight from the datasheet.
Which 'Fuse doctor' are you using?
/EDIT
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"Experience is what enables you to recognise a mistake the second time you make it." "Good judgement comes from experience. Experience comes from bad judgement." "Wisdom is always wont to arrive late, and to be a little approximate on first possession." "When you hear hoofbeats, think horses, not unicorns." "Fast. Cheap. Good. Pick two." "We see a lot of arses on handlebars around here." - [J Ekdahl] |
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david.prentice The Tiny26 is 20pin. So I suspect that it is HVPP.
.
The STK500 should be able to HVPP any chip that is not fatally damaged.
Be realistic. Chips unsoldered from surplus unused boards might be 100% recoverable.
.
If they were salvaged from faulty equipment or boards just tipped into an oven they might be permanently damaged.
.
David.
The Tiny26 is 20pin. So I suspect that it is HVPP.
The STK500 should be able to HVPP any chip that is not fatally damaged.
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"Experience is what enables you to recognise a mistake the second time you make it." "Good judgement comes from experience. Experience comes from bad judgement." "Wisdom is always wont to arrive late, and to be a little approximate on first possession." "When you hear hoofbeats, think horses, not unicorns." "Fast. Cheap. Good. Pick two." "We see a lot of arses on handlebars around here." - [J Ekdahl] |
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I assume your fuse doctor is HVSP? If the fuses have been changed, a chip erase with HVSP is not sufficient. You'll also need to change the fuses back to factory default. Does your fuse doctor do that? Steps:
- HVSP chip erase
- HVSP write lfuse to 0xE1
- HVSP write hfuse to 0xF7
- HVSP chip erase again
After all these steps, are you still unable to recover these t26?
STK500 not support - HVSP, supports only ISP & HVPP
****************
All chips are not overheated! possibly clean from the factory and the old batch...
david.prentice Rubbish. STK500 supports HVSP. How else would it HV program the low pin count Tinies e.g. Tiny25
.
Your Tiny26 has 20 pins. So it uses HVPP.
.
Have you determined whether these chips have been mistreated or carefully removed from unused boards?
Or even unmounted chips that had been programmed by the Distributor?
.
Follow Joey's advice. He meant HVPP not HVSP. Check connections carefully.
Soldering SMD onto adapter to do HVPP is easy. Unsoldering afterwards is hard work.
A clamshell is only reliable with chips that have NEVER been soldered.
.
David.
Your Tiny26 has 20 pins. So it uses HVPP.
I believe it uses regular ISP, no high voltage needed, unless maybe the clock has been mis-set & need re-established.
clawson But what if they have used RSTDISBL? As OP owns an STK500 the most guaranteed way to get in touch with the chips is going to be HVPP I think. He already said he's got an SSOP to DIP adapter to plug them into STK500 and as they are not "in circuit" there's presumably no issues about +12V floating around?
We read the topic from the beginning!
With STK500 no problem works fine with: AtMega8, 48, 32, AtTiny26 (contlol MC SSOP-20), 13A, 2313.
The problem is with this party in 100 pieces, were packed in tape, not soldered!
20 Pieces - Resurrected with a device - Fuse bit doctor!
Not the first time, but they signatures erased in the factory 0x1E9109!
___
I can do nothing with the rest!
Contact, speed, panel SSOP, soldered - checked!
david.prentice "Packed in tape" means what?
If you mean that they have never been soldered, say so.
.
There is something strange if you bought 12 year old chips.
.
If you have only got 20 good chips from a batch of 100, I hope that you bought them cheap.
.
Fuse Doctor is nothing more than HVPP program that does what Joey suggested with a STK500.
If STK500 works 100% for HVPP m8, m48, m32, t26, t2313 and HVSP for t13a you obviously know how to set up ribbons and jumpers..
.
If chip fails with STK500 I would bin it. If you only have 20% success from a batch, I would not recommend using them in a heart pacemaker or nuclear bomb.
.
David.
If you only have 20% success from a batch
If the supplier will not take them back, or replace them with good stock then don't use them again and let others know who they are.
Jim
You haven't answered my question:
Which 'Fuse doctor' are you using?
If chip fails with STK500 I would bin it
However, if the OP insists on his quest, the following may be of help:
http://legacy.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=140556
http://www.eevblog.com/forum/microcontrollers/bootloader-on-smd-atmega328p-au/msg268938/#msg268938
http://legacy.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=208216#208216
But the going will not be easy. I'd say cut your losses and toss the ones that aren't responding.
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"Experience is what enables you to recognise a mistake the second time you make it." "Good judgement comes from experience. Experience comes from bad judgement." "Wisdom is always wont to arrive late, and to be a little approximate on first possession." "When you hear hoofbeats, think horses, not unicorns." "Fast. Cheap. Good. Pick two." "We see a lot of arses on handlebars around here." - [J Ekdahl] |
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If you only have 20% success from a batch, I would not recommend using them in a heart pacemaker or nuclear bomb.
I was reading some article about the nuclear triggering switches & system---that it has some defense dept requirement to have at most 1 chance in one billion of failure.
To me, that seems rather low. I have worse odds of winning the lottery!
edit: found it
The following are safety criteria design requirements for all U.S. nuclear weapons:
◾ Normal environment: Prior to receipt of the enabling input signals and the arming signal, the probability of a premature nuclear detonation must not exceed one in a billion per nuclear weapon lifetime.
◾ Abnormal environment: Prior to receipt of the enabling input signals, the probability of a premature nuclear detonation must not exceed one in a million per credible nuclear weapon accident or exposure to abnormal environments.
◾ One-point safety: The probability of achieving a nuclear yield greater than four pounds TNT equivalent in the event of a one-point initiation of the weapon’s high explosive must not exceed one in a million.
[Цитата = joeymorin]
Вы не ответили на мой вопрос:
joeymorin писал (а):
Какой «врач-предохранитель» вы используете?
https://www.google.com/search?q=...
david.prentice писал (а):
Если чип не сработает с STK500, я бы его
Согласен.
Однако, если ОП настаивает на своем квесте, может помочь следующее:
http://legacy.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=140556
http://www.eevblog.com/forum/microcontrollers/bootloader-on-smd-atmega328p-au/msg268938/#msg268938
http://legacy.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=208216#208216
[/ Цитата]
Is very similar!
The question remains how to read and change this area!
Have another device ?! Question links to the author!
https://www.google.com/search?q=...
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"Experience is what enables you to recognise a mistake the second time you make it." "Good judgement comes from experience. Experience comes from bad judgement." "Wisdom is always wont to arrive late, and to be a little approximate on first possession." "When you hear hoofbeats, think horses, not unicorns." "Fast. Cheap. Good. Pick two." "We see a lot of arses on handlebars around here." - [J Ekdahl] |
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Actual Ver 2:10 Offline reset fuse.
Damp can send...
Above gave links to the signature programmer. The question is where to find a link to it?
That picture tells me nothing. Post a link to the software.
The question remains how to read and change this area!
Truly. Throw these in the garbage.
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"Experience is what enables you to recognise a mistake the second time you make it." "Good judgement comes from experience. Experience comes from bad judgement." "Wisdom is always wont to arrive late, and to be a little approximate on first possession." "When you hear hoofbeats, think horses, not unicorns." "Fast. Cheap. Good. Pick two." "We see a lot of arses on handlebars around here." - [J Ekdahl] |
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http://mdiy.pl/atmega-fusebit-do...
Full progect.
***
But it still does not help in 70 pieces.
Above were links to another project, but I have not yet found the ends.
Throw pok ane option ...
http://mdiy.pl/atmega-fusebit-do...
I'd suggest you try to confirm that the firmware you are using follows the steps I outlined in #29:
- HVSP chip erase
- HVSP write lfuse to 0xE1
- HVSP write hfuse to 0xF7
- HVSP chip erase again
But I will say again: Throw away the 70.
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"Experience is what enables you to recognise a mistake the second time you make it." "Good judgement comes from experience. Experience comes from bad judgement." "Wisdom is always wont to arrive late, and to be a little approximate on first possession." "When you hear hoofbeats, think horses, not unicorns." "Fast. Cheap. Good. Pick two." "We see a lot of arses on handlebars around here." - [J Ekdahl] |
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js 
That picture tells me nothing.
It tells me that there aren't any resistors in series with the LEDs and no bypass caps and possibly AVCC is not connected, but that's just a guess.
david.prentice It also looks like two electrolytics on what is probably a 7805.
Nowadays there's really no excuse for not having silkscreen on the top & bottom to tell what is going on.
