03-25-2013, 01:19 PM | #1 |
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Need Help/Guide for debricking PW via Serial Port.
Hi. I bricked my PW somehow. The last option is trying to use serial port. But my knowladge about it is very low. Any help will be appraciated.
For example: which pin is TxD RxD GND? |
03-25-2013, 02:02 PM | #2 |
Wizard
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First: This should probably be moved to the developer's corner.
The question is answered in a topic in that board here: https://www.mobileread.com/forums/sho...40&postcount=4 Be sure to have a 1.8volts UART adapter to connect it to. Anything higher puts your device in danger of being fried completely. So: no classic PC serial port (without level converter), no 5v, no 3.3v. Yes, 1.8v adapters are still rare. |
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04-03-2013, 08:13 AM | #3 |
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I have managed to obtain an usb to ttl module, which can support 1.8V but cannot provide it from usb power, but has VCCIO, so I could theoretically use Paperwhite 1.8VCC with my serial module.
Unfortunately on the Paperwhite image only TX RX and Ground can be seen. Is there anyone who knows where can I get VCC from paperwhite board? |
04-03-2013, 10:23 AM | #4 | |
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Quote:
The recommended usb-ttl adapters do not have this problem, as they contain an interface power regulator. |
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04-03-2013, 11:20 AM | #5 | |
( ͡° ͜ʖ ͡°){ʇlnɐɟ ƃǝs}Týr
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I will be trying out the TTL-232RG-VREG1V8-WE
Supports +1.8V TTL level UART signals and +1.8V / 100mA rated power output. http://www.ftdichip.com/Products/Cab...BTTLSerial.htm http://www.ftdichip.com/Support/Docu...2RG_CABLES.pdf Once I have 100% confirmed the support / levels and correct wiring configuration I will write it up in full, with pictures, and links. Save future readers the pain of buying incorrectly specified products. Cheers. Quote:
Last edited by twobob; 04-03-2013 at 01:09 PM. |
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04-03-2013, 02:57 PM | #6 |
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The discussed serial cable is way too expensive in my country, so I would want to experiment with mine.
If I use external power, I suppose I should give VCCIO the +1.8V, and to the ground should I connect the kindle Ground or external power -1.8V? |
04-03-2013, 03:00 PM | #7 | |
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Quote:
the ground side should be common to all the components - Kindle, adapter, interface power. It would help a lot if you posted a link to this adapter's data sheet that you are using, or at least a link to the adapter's web page so that we can find the data sheet. PS: Why go to all this trouble? Just report it "broke" to Amazon - get it exchanged. |
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04-03-2013, 03:10 PM | #8 |
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I am trying to use this:
http://www.ebay.com/itm/USB-to-TTL-C...item2327a7ac1b Well I have already reported, and got my replacement, but it would cost me a fortune to send them back my broken one (actually getting the new one cost half a new kindles price :S) that they let me keep the "broken". It is that I just want to experiment with it, maybe I can bring it back to life. It is on the YKNR page. Last edited by PolarFox; 04-03-2013 at 10:33 PM. |
04-04-2013, 03:38 AM | #9 |
Wizard
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I think I'd just use the next power source that comes across with a low voltage, or even two AA batteries - and then use a few diodes to lower the voltage (forward drop) to about 1.8 volts. I guess you'll be set with two 1.5 volt batteries and two si/ge diodes to clamp that down. Use a volt meter to check.
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