CooCox Embedded Pi, User Manual, Page: 20 / 47

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4 Operation Modes
The Embedded Pi has three operation modes, selectable by jumpers. Refer to 3.12 Jumper .
4.1 STM32/Standalone Mode
The Embedded Pi works as an Arduino
TM
form-factor compatible mother board where the STM32
controls the Arduino
TM
shields directly without the use of Raspberry Pi. It can sense the
environment by receiving input from a variety of sensors and can affect its surroundings by
controlling lights, motors, and other actuators.
STM32
CoX STM32 Library (HAL)
Hardware Layer
Application Layer
Ar
du
in
o f
orm
-fa
cto
r
co
m
pa
tib
le
in
te
rfa
ce
s
EP
I e
xt
en
de
d
in
te
rf
ac
es
Arduino Shields
LCD Motor Sensor
Key Network ...
1 SPI, 1 I2C
,
1
UART with flow
control, 2 pairs
of PWM (+-), 6
analog inputs
,
1
CAN
1 SPI, 1 I2C, 4
PWM, 1 UART,
6 analog inputs
CooCox Shields
LCD Motor Sensor
Key Network ...
Shield Driver Layer
LCD
Driver
Motor
Driver
Sensor
Driver
Key
Driver
WiFi, ETH
Driver
...
Figure 4-1 Block diagram of STM32 Mode
4.1.1 Hardware connections
The Embedded Pi is compatible with both 5V and 3.3V Arduino
TM
shields, selectable with jumpers.