Verification error

Gramps

Gramps

Senior Member
When downloading a program it starts to load but then it says, "verification error transmitted but nothing received by bite 63"
I checked the download cable and it loads to another picaxe no problem.
I'm assuming that the downloader is not receiving a signal back from the chip.
 
B

bpowell

Senior Member
Sounds like a good assumption ... make sure there is nothing else connected to the download circuit ... make sure the chip is resetting and in download mode, maybe try a hard-reset.
 
F

Flenser

Senior Member
I've never seen this particular "verification error transmitted but nothing received by bite 63" error.

However I have had verification errors due to any poor connection, so make sure you have good connections for all the power, ground and txd connections from the download cable to the PICAXE chip.

I have also had download errors when the ground for the download cable was not connected to the ground for the PICAXE chip.
 
Buzby

Buzby

Senior Member
I have had similar errors when the Picaxe was battery powered. New batteries fixed it.

Another common fault is trying to use the 3.5mm programming socket on a breadboard. The pins on the socket are not long enough to make reliable connection.
 
Gramps

Gramps

Senior Member
What we have here is a new hard wired prototype build that worked fine on the breadboard.🤔
Appreciate all the good suggestions of what the problem could be. Further testing today and I will report back later,
 
Technical

Technical

Technical Support
Staff member
Verification errors are almost always voltage related - bad ground, flat batteries etc.
 
F

Flenser

Senior Member
Gramps said:
What we have here is a new hard wired prototype build that worked fine on the breadboard
Click to expand...
The next suggestions are to check for any bad solder joints. We've seen this reported before on the forum with soldered prototypes.
 
B

bpowell

Senior Member
Gramps said:
What we have here is a new hard wired prototype build that worked fine on the breadboard.🤔
Appreciate all the good suggestions of what the problem could be. Further testing today and I will report back later,
Click to expand...
I usually start with:

1: Bang hangs on counter sharply ... on either side of the PICAXE

2: Ask the PICAXE directly, "What is wrong with you?!"

3: Re-try download 9 or 10 more times

I then move onto self-medicating and troubleshooting ... your approach may vary, but this has worked for me over the years! :)
 
Gramps

Gramps

Senior Member
Okay here's my results so far.
Attempted a download with the VOM attached to the power supply. Voltage remain steady at 5.0v
Did a hard reset.
This time the error said number 128
Did another hard reset.
This time the error said number 255!
 
Gramps

Gramps

Senior Member
As you can see I sodered in my faithful download adapter for my breadboard! Still showing the same error.
 
J

Jack Burns

New Member
Have you remembered to connect both 0V legs together on the 28x2, (legs 8 & 19)?

Have decoupling capacitors been fitted?
 
Buzby

Buzby

Senior Member
neiltechspec said:
Decoupling is essential, as close to chip power pins as possible.
Click to expand...
This should be printed on every electronic chip, in BIG LETTERS.

I learnt my lesson many, many, years ago. A circuit I built ( not Picaxe, but that makes no difference ) wouldn't work.
Checked wiring very carefully. Checked power rails with a decent meter, solid 5v. Swapped ICs, no difference.

Eventually I got the big guns out, and put the oscilloscope to work. I found a very high frequency sine wave of about 3v superimposed on the 5v rail.

Put a few 0.1uF caps across the rails, and the circuit burst into life.

So now every circuit I build, even just lash-up test stuff, has decoupling from the start.
 
Buzby

Buzby

Senior Member
Yes, you are supposed to put one across the power rails close to each IC.

When a digital IC operates its internal operation can, and often does, draw high current pulses from the rails. This pulse may only be for nanoseconds, but it can upset other ICs in the circuit, or sometimes upset itself !

A decoupling capacitor provides a tiny reserve of power, which keeps the high current pulse localised to the offending IC.

25966

The capacitor needs to provide this 'reserve power' very quickly, so the cap is usually ceramic or poly plastic. Electrolytics are too slow, so they are used for bulk smoothing of rough supplies.

There is a huge amount of research into decoupling, as it gets more tricky when you have multi-layer PCBs running at GHz frequencies.

You don't need to bother with all that on a Picaxe. Just put 0.1uF across each chip and you'll be fine.
 
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P

piclt

Member
Gramps..... I see you tested the download cable on another Picaxe and it worked....???....Do you mean the other picaxe was in the same proto board with the same program or just another Picaxe in probably a breadboard....??..... and was it the same program or just flashing leds or buzzers.

Your problem picaxe is in a socket..... You should try it in a breadboard connected to nothing except the download board and cable and 5 volt power with 8 and 19 linked....and see will it take any program eg. flashing leds etc. If it does, then see will it take your problem program in the same breadboard just connected to download and power...... If it does then Picaxe is programming OK.

Then Check out your protoboard circuit and try another Picaxe in the protoboard ......?
 
P

piclt

Member
I assumed you had a breadboard with a prog. socket already on it......so just unplug picaxe from protoboard and plug in to breadboard, plugin your yellow, red, and black programming wires, add power and download...... I think for quick test it should program without the caps..?
 
Gramps

Gramps

Senior Member
The 0.1 UF caps are still on my breadboard!
This very same chip loaded this program perfectly on the breadboard before I installed it on the proto board.
 
P

piclt

Member
Sorry, Im getting confused, I thought on your first post you said you had tried on another Picaxe.

Well, then, unplug the 0.1uf caps from the Breadboard, unplug the problem Picaxe from the socket on protoboard, plugin problem Picaxe to breadboard and see will it program without the caps.
 
P

piclt

Member
Good to see you got it sorted.... What size of Cap did you fit..?? ...... Were you using the same PSU for the breadboard as you have connected to the protoboard..??
 
Gramps

Gramps

Senior Member
piclt said:
. What size of Cap did you fit..?? ...... Were you using the same PSU for the breadboard as you have connected to the protoboard..??
Click to expand...
.1uf cap
Yes and yes. Same micro, same power supply and same download jack.
The only difference was, when the micro got moved to the proto board, the capacitor was still on the breadboard!
it's only five wires what could possibly go wrong 😂
Click to expand...
 
P

piclt

Member
And "size" does matter....... the small 0.1uf probably means some High Freq. spikes or inteferrence from somewhere suppressed now by the cap.

If it had needed something like 100uf or 470uf it would have probably pointed to "ripple" etc from the PSU being the problem.
 
P

piclt

Member
Yes, its all about Drive and Direction...... and Applying it........ The small Picaxe can do big things
 
lbenson

lbenson

Senior Member
Nice job.

Re photos, if uploaded to the forum, 1) they won't go away if an outside site disappears or changes or subscription expires, and 2) you get a good preview in your post.
 
Gramps

Gramps

Senior Member
Thanks to all that helped with the software!
Three (RC) channel 60 amp brushed motor controller for less than 100 bucks!
 
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