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yes it is.
but your interface connections are wrong.
The Kindle uses a 1.8volt interface, your rpi does not provide that level of interface.
You need to use a proper low voltage (1.8 volt) adapter.
The Kindle only uses a 3 wire interface:
Tx -> Rx
Rx <- TX
Gnd <> GND
in some of the serial port information you will notice a connection to the adapter of an external 1.8 volt - -
That is a reference for the interface adapter **ONLY** - not power to either device..
Do not try to connect Kindle Vcc to anything else Vcc.
I strongly suggest that you follow the actual directions without any local modifications that you make up yourself.
(Ask yourself:
If you already knew enough to make up your own procedure - why are you reading ours?
I.E: follow our directions or make up your own, do not mix the two.)
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