Quote:
Originally Posted by geekmaster
The kindle TxD cannot sink enough current to light a serial adapter TxD LED. The LED may faintly light up, but the kindle has a 1K series resistor and the serial adapter RxD will only see about 1.4v on its RxD line for a logic zero, and will think that is actually a logic one. My modification consisted of removing the LED, adding a 22L pullup resistor to +3.3v, and adding a series diode to the wire going from the kindle TxD to the adapter RxD, such that the kindle could pull the adapter RxD line down to 0.7v (silicon diode voltage drop) which is recognized as logic zero for 1.8v/3.3v/5v TTL devices.
Yes, perhaps just buying a 1.8v adapter is better, but good luck searching for one, because most 3.3v adapters come with 1.8 meter cables.  |
No problem with the USB adapter. I've done a couple of these with an FTDI. Here I will just use a voltage shifter. the DKU-5 cable is perfect for this, however this has 3.3v levels as far as I know, so the level shift still needs to be done.
It's still courius, why doesn't it boot and gets stuck at 10-12% ... I've flashed also my data to it, and also the 3.0.2 kernel and rootfs successfully to it.
Off-topic: while taking apart my kindle, I've managed to cut with the screwdriver the film that connects the kindle to the display
So after all, I might just build one from the 2, as I've checked, it costs 66$+ shipment for a new display ...