<s>
Flipper	B-Device
Zero	I-Device
is	O
a	O
portable	O
Tamagotchi-like	O
multi-functional	O
device	O
developed	O
for	O
interaction	O
with	O
access	O
control	O
systems	O
.	O
</s>
<s>
The	O
device	O
is	O
able	O
to	O
read	O
,	O
copy	O
,	O
and	O
emulate	O
RFID	B-Application
and	O
NFC	O
tags	O
,	O
radio	O
remotes	O
,	O
iButton	O
,	O
and	O
digital	O
access	O
keys	O
,	O
along	O
with	O
a	O
GPIO	B-Architecture
interface	O
.	O
</s>
<s>
The	O
device	O
's	O
user	O
interface	O
embodies	O
a	O
pixel-art	O
dolphin	O
virtual	O
pet	O
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
is	O
designed	O
for	O
interaction	O
with	O
various	O
types	O
of	O
access	O
control	O
systems	O
,	O
radio	O
protocols	O
,	O
RFID	B-Application
,	O
near-field	O
communication	O
(	O
NFC	O
)	O
,	O
and	O
infrared	O
signals	O
.	O
</s>
<s>
To	O
operate	O
the	O
device	O
,	O
it	O
is	O
not	O
required	O
to	O
have	O
a	O
computer	O
or	O
a	O
smartphone	B-Application
—	O
it	O
can	O
be	O
controlled	O
via	O
a	O
5-position	O
D-pad	O
and	O
a	O
separate	O
back	O
button	O
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
has	O
a	O
monochrome	O
orange	O
backlight	O
LCD	B-Device
screen	I-Device
with	O
a	O
resolution	O
of	O
128x64	O
pixels	B-Algorithm
.	O
</s>
<s>
For	O
connection	O
with	O
external	O
modules	O
,	O
the	O
device	O
has	O
general-purpose	B-Architecture
input/output	I-Architecture
(	O
GPIO	B-Architecture
)	O
pinholes	O
on	O
the	O
top	O
side	O
.	O
</s>
<s>
Some	O
actions	O
,	O
such	O
as	O
firmware	O
or	O
user	O
data	O
update	O
,	O
require	O
a	O
connection	O
to	O
a	O
computer	O
or	O
a	O
smartphone	B-Application
with	O
developer	O
's	O
software	O
installed	O
.	O
</s>
<s>
The	O
electronic	O
schematics	O
and	O
firmware	O
of	O
the	O
Flipper	B-Device
Zero	I-Device
project	O
are	O
open-sourced	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
is	O
based	O
on	O
a	O
dual-core	O
ARM	B-Architecture
architecture	I-Architecture
STM32WB55	O
microcontroller	B-Architecture
,	O
which	O
has	O
256	O
Kb	O
of	O
RAM	O
and	O
1	O
MB	O
of	O
Flash	O
storage	O
.	O
</s>
<s>
The	O
second	O
core	O
is	O
32MHz	O
Cortex-M0	O
runs	O
STMicroelectronics	O
proprietary	B-Application
firmware	O
that	O
implements	O
Bluetooth	B-General_Concept
Low	I-General_Concept
Energy	I-General_Concept
protocol	O
.	O
</s>
<s>
Unlike	O
software-defined	B-Architecture
radio	I-Architecture
,	O
the	O
CC1101	O
chip	O
cannot	O
capture	O
raw	O
radio	O
signals	O
.	O
</s>
<s>
The	O
Flipper	B-Device
Zero	I-Device
firmware	O
is	O
based	O
on	O
the	O
FreeRTOS	B-Operating_System
operating	O
system	O
,	O
with	O
its	O
own	O
software	O
abstraction	O
over	O
the	O
hardware	O
layer	O
.	O
</s>
<s>
The	O
firmware	O
is	O
mostly	O
written	O
in	O
the	O
C	B-Language
programming	I-Language
language	I-Language
,	O
with	O
occasional	O
use	O
of	O
C++	B-Language
in	O
third-party	O
modules	O
.	O
</s>
<s>
The	O
system	O
uses	O
multitasking	B-Operating_System
in	O
combination	O
with	O
an	O
event-driven	B-Application
architecture	I-Application
to	O
organize	O
the	O
interaction	O
of	O
applications	O
and	O
services	O
executed	O
in	O
a	O
single	O
address	O
space	O
and	O
communicating	O
through	O
a	O
system	O
of	O
queues	B-Application
and	O
events	O
.	O
</s>
<s>
FuriCore	O
abstracts	O
and	O
extends	O
the	O
functionality	O
of	O
the	O
FreeRTOS	B-Operating_System
scheduler	O
and	O
adds	O
additional	O
system	O
primitives	O
.	O
</s>
<s>
Sub-GHz	O
,	O
Infrared	O
,	O
RFID	B-Application
,	O
NFC	O
,	O
etc	O
are	O
applications	O
for	O
user	O
interaction	O
.	O
</s>
<s>
Interaction	O
with	O
the	O
file	O
system	O
on	O
the	O
SD	O
card	O
is	O
implemented	O
using	O
the	O
FatFs	B-Device
library	O
.	O
</s>
<s>
The	O
build	O
system	O
is	O
based	O
on	O
the	O
SCons	B-Application
tool	O
with	O
additional	O
tooling	O
written	O
in	O
Python	B-Language
.	O
</s>
<s>
For	O
compilation	O
,	O
the	O
system	O
uses	O
its	O
own	O
open	O
toolchain	O
based	O
on	O
GNU	B-Application
Compiler	I-Application
Collection	I-Application
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
has	O
a	O
built-in	O
module	O
that	O
can	O
read	O
,	O
store	O
,	O
and	O
imitate	O
remote	O
controls	O
,	O
allowing	O
it	O
to	O
receive	O
and	O
send	O
radio	O
frequencies	O
between	O
300	O
and	O
928	O
MHz	O
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
is	O
able	O
to	O
be	O
used	O
to	O
find	O
out	O
if	O
a	O
person	O
's	O
security	O
has	O
been	O
hacked	O
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
is	O
compatible	O
with	O
low-frequency	O
(	O
LF	O
)	O
radio	B-Application
frequency	I-Application
identification	I-Application
(	O
RFID	B-Application
)	O
,	O
which	O
is	O
used	O
in	O
supply	O
chain	O
tracking	O
systems	O
,	O
animal	O
chips	O
,	O
and	O
access	O
control	O
systems	O
.	O
</s>
<s>
LF	O
RFID	B-Application
cards	O
typically	O
do	O
n't	O
offer	O
high	O
levels	O
of	O
security	O
,	O
in	O
contrast	O
to	O
NFC	O
cards	O
.	O
</s>
<s>
A	O
low-frequency	O
RFID	B-Application
module	O
in	O
the	O
Flipper	B-Device
Zero	I-Device
can	O
read	O
,	O
save	O
,	O
simulate	O
,	O
and	O
write	O
LF	O
RFID	B-Application
cards	O
.	O
</s>
<s>
NFC	O
technology	O
,	O
used	O
in	O
digital	O
business	O
cards	O
,	O
access	O
cards	O
,	O
and	O
smart	O
cards	O
for	O
public	O
transportation	O
,	O
is	O
supported	O
by	O
Flipper	B-Device
Zero	I-Device
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
can	O
communicate	O
with	O
gadgets	O
like	O
TVs	O
,	O
air	O
conditioners	O
,	O
multimedia	O
systems	O
,	O
etc	O
.	O
</s>
<s>
You	O
may	O
explore	O
hardware	O
,	O
flash	O
firmware	O
,	O
debug	O
,	O
and	O
fuzz	O
with	O
your	O
Flipper	B-Device
Zero	I-Device
.	O
</s>
<s>
It	O
has	O
built-in	O
GPIO	B-Architecture
pins	O
that	O
may	O
be	O
used	O
to	O
connect	O
to	O
hardware	O
,	O
operate	O
hardware	O
via	O
buttons	O
,	O
execute	O
code	O
,	O
and	O
display	O
debug	O
messages	O
on	O
the	O
LCD	B-Device
screen	I-Device
.	O
</s>
<s>
It	O
functions	O
as	O
a	O
USB	B-Protocol
to	O
UART	O
,	O
SPI	O
,	O
or	O
I2C	O
converter	O
as	O
well	O
.	O
</s>
<s>
Flipper	B-Device
Zero	I-Device
works	O
as	O
a	O
BadUSB	O
device	O
that	O
is	O
recognized	O
by	O
your	O
computer	O
as	O
a	O
keyboard-like	O
Human	B-General_Concept
Interface	I-General_Concept
Device	I-General_Concept
(	O
HID	O
)	O
.	O
</s>
