<s>
BeRTOS	B-Operating_System
is	O
a	O
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
designed	O
for	O
embedded	B-Architecture
systems	I-Architecture
.	O
</s>
<s>
It	O
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
released	O
under	O
the	O
GNU	O
General	O
Public	O
License	O
,	O
version	O
2	O
(	O
GPLv2	O
)	O
or	O
later	O
,	O
with	O
a	O
special	O
exception	O
granting	O
proprietary	O
applications	O
the	O
right	O
to	O
keep	O
their	O
source	O
code	O
closed	O
while	O
keeping	O
the	O
base	O
BeRTOS	B-Operating_System
code	O
open	O
.	O
</s>
<s>
It	O
has	O
a	O
very	O
modular	O
design	O
,	O
that	O
allows	O
running	O
it	O
on	O
different	O
architectures	O
,	O
ranging	O
from	O
tiny	O
8-bit	O
microcontrollers	B-Architecture
such	O
as	O
Atmel	B-Architecture
AVR	I-Architecture
microcontrollers	B-Architecture
up	O
to	O
the	O
32-bit	O
ARM	B-Architecture
architecture	I-Architecture
,	O
and	O
on	O
hosted	O
environments	O
such	O
as	O
Linux	B-Application
and	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
BeRTOS	B-Operating_System
is	O
written	O
in	O
ANSI	O
C	O
,	O
and	O
supported	O
by	O
popular	O
embedded	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
and	O
successor	O
Transport	B-Protocol
Layer	I-Protocol
Security	I-Protocol
(	O
TLS	O
)	O
libraries	B-Library
such	O
as	O
wolfSSL	B-Protocol
.	O
</s>
<s>
BeRTOS	B-Operating_System
preemptive	O
multitasking	O
kernel	B-Operating_System
implements	O
many	O
inter-process	B-Operating_System
communication	I-Operating_System
(	O
IPC	O
)	O
primitives	O
,	O
including	O
:	O
signals	B-Operating_System
,	O
semaphores	B-Operating_System
,	O
and	O
messages	B-Architecture
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
kernel	B-Operating_System
,	O
BeRTOS	B-Operating_System
provides	O
a	O
hardware	B-Operating_System
abstraction	I-Operating_System
layer	I-Operating_System
(	O
HAL	O
)	O
that	O
includes	O
many	O
peripheral	O
device	B-Application
drivers	I-Application
(	O
timer	O
,	O
serial	O
,	O
analog-to-digital	O
converter	O
(	O
ADC	O
)	O
,	O
motors	O
,	O
liquid-crystal	B-Device
display	I-Device
(	O
LCD	B-Device
)	O
,	O
NTC	O
sensors	O
,	O
keyboard	O
,	O
buzzer	O
,	O
memories	O
)	O
,	O
algorithms	O
(	O
hash	B-Algorithm
table	I-Algorithm
,	O
cyclic	O
redundancy	O
check	O
(	O
CRC	O
)	O
,	O
MD2	B-Algorithm
,	O
entropy	O
pool	O
,	O
run-length	B-Algorithm
encoding	I-Algorithm
(	O
RLE	O
)	O
)	O
,	O
communication	O
protocols	O
,	O
and	O
a	O
graphic	O
windowing	O
subsystem	O
for	O
small	O
display	B-Device
devices	I-Device
.	O
</s>
