Thread: Hardware Serial Question
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Old 01-11-2013, 05:08 AM   #7
lporter
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Posts: 18
Karma: 36674
Join Date: Jan 2013
Device: Kindle Paperwhite
Quote:
Originally Posted by geekmaster View Post
The components are 1K series resistors. You can solder to the other side of them (away from the board edge). I soldered fine enamel wire to them (taken from the coil in a dead CFL bulb). I taped that wire down for strain relief, then soldered my larger serial cable wires to the free end of the enamel wires.

What are you using for your 1.8v serial adapter?

Because the PW has no keys, there was speculation that the "magic key" may be internal jumper or test points.

Regarding the garbled text, it may be a grounding issue. Try leaving the USB cable attached between the kindle and the same computer as the USB serial adapter. Also, check out the "serial level shifter" thread:
http://www.mobileread.com/forums/sho...d.php?t=162775
Ah, okay. That's nothing too awful to replace.I should have a fwe of them spare.

I'm using a USB to Serial adaptor with pin 4 of the FDTI chip soldered to the 1.8V Supply of the kindle to bring it to the correct level.

I'm know for a fact that that the 'magic key' is an internal jumper. I read the datasheet for the processor. There are two pins that have to be brought high to make the SoC enter USB download mode. Sadly, as the processor is BGA, it's very difficult to actually find a connection TO these pins.
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