Andy's Postbag and random ebay links

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ahull
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Re: Andy's Postbag and random ebay links

Postby ahull » Sat Mar 11, 2017 9:29 am

Ooooh! I popped it!! ... one re-flash too many, not paying attention.

The battery came loose while re-flashing one of the GT-S5830 phones.
Schoolboy error. :oops:

So now I have 4 fully working (three GT-S5830i and one GT-S5830), one GT-S5830i in need of SIM card surgery and one GT-S5830 that is a glass brick. No amount of multi-butten-finger-ger-poking and cursing elicits any response from the copse, so Mr Google and I think I've successfully buggered the boot loader. Time to solder on some wires and attach an STM32F013 Black Magic Probe perhaps.

I guess I could take the easy route and pop down to my local high street fone freaking emporium, to see if they can Riff box the thing back to life, but a combination of curiosity, parsimony and a slightly bruised ego suggests an alternative course of action might be more fun. I should be able to get the zombie phone to do my bidding by soldering on a few wires and shouting at it in fluent JTAG. All I need now is the spare time to play with it, and a short length of ribbon cable. The JTAG connector is easily accessible as you can see in the image below, by moving the sticker in the battery compartment.

Google even reveals the pinout.

    1. GND (assume pin 1 is the pad at the top in my image, that is obviously connected to the ground plane).
    2. SRST
    3. TDO
    4. TCK
    5. TDI
    6. TRST
    7. NC. ?
    8. TMS
    9. NC. ?

Time will tell if I ever get round to attempting this of course of action of course. I'm sure there are more important things I should be getting on with ;)

Image
Galaxy Ace GT-S5830 (cooper) JTAG
- Andy Hull -

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ahull
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Re: Andy's Postbag and random ebay links

Postby ahull » Sat Mar 11, 2017 10:00 pm

What's the first thing you do with anything new round here?
Turn it in to an Oscilloscope of course.
(See.. -> https://f-droid.org/repository/browse/? ... &page_id=0 for more.)
Image

Image

... I don't think I'd have much luck debugging the item in the video below with it though..



.. enjoy ;)
- Andy Hull -

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BennehBoy
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Re: Andy's Postbag and random ebay links

Postby BennehBoy » Sat Mar 11, 2017 10:15 pm

Ha great video :D
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RogerClark
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Re: Andy's Postbag and random ebay links

Postby RogerClark » Sun Mar 12, 2017 12:09 am

Great video

I wondered how they could be powering LEDs directly from a CR2 battery, which is 3V.

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ahull
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Re: Andy's Postbag and random ebay links

Postby ahull » Wed Mar 15, 2017 2:00 am

I forgot to mention one nice find (as well as the oscilloscope app)...

https://f-droid.org/repository/browse/? ... mer.siggen

A simple signal generator (sine/square/sawtooth) described thus...

An android signal generator with twirly knob.

Frequency range 10Hz - 25KHz
Level range 0dB - -80dB

A nice little toy for testing Pig-O-scopes with.... or simply annoying the dog :D
- Andy Hull -

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ahull
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Re: Andy's Postbag and random ebay links

Postby ahull » Sun Mar 19, 2017 4:28 pm

More pliers and side cutters. I probably didn't need them, but they were in the going extra cheap bin in one of the two identical cheap German supermarkets.. Four in the (damaged) package, picked up for less than £1 per pair. Surprisingly well constructed, solid German engineering.

Cutters_and_Pliers.jpg
Cutters_and_Pliers.jpg (241.36 KiB) Viewed 126 times


I'm still playing with those six Galaxy Ace phones.. and I just found another excellent app.

RealCalc

CalculatorApp.jpg
CalculatorApp.jpg (187.07 KiB) Viewed 126 times


https://play.google.com/store/apps/deta ... s.RealCalc
- Andy Hull -

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BennehBoy
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Re: Andy's Postbag and random ebay links

Postby BennehBoy » Sun Mar 19, 2017 5:12 pm

I still use a pair of sidecutters that I inherited from a field engineer ~ 12 years ago :D Inherited = he forgot them at my home.
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ahull
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Re: Andy's Postbag and random ebay links

Postby ahull » Sun Mar 19, 2017 8:26 pm

BennehBoy wrote:I still use a pair of sidecutters that I inherited from a field engineer ~ 12 years ago :D Inherited = he forgot them at my home.


I have a large (about two foot long) ratchet wrench somewhere that literally fell of the back of a lorry, and damn near took out my windscreen. Its quite a good one too. Not a torque wrench, but good for rounding the heads off stubborn bolts prior to resorting to cutting/drilling/hammering them out :twisted: Also a very sturdy claw hammer that I found while walking the dog. I may have used the two of them at the same time on occasions.
- Andy Hull -

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BennehBoy
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Re: Andy's Postbag and random ebay links

Postby BennehBoy » Sun Mar 19, 2017 8:52 pm

I have a good selection of torque renches, inlcuding "The Big Bopper":

Image
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