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5
3 Hardware Layout and Configuration
3.1 Block Diagram
STM32
STM32
IO PWM PWM IO PWM IO TX RX
PWM- PWM+ PWM- PWM+ CTS2 RTS2 TX2 RX2
SCL SDA AREF GND SCK MISO MOSI SS PWM IO
SCL2 SDA2 IO IO SCK2 MISO2 MOSI2 SS2 CANTX CANRX
Embedded Pi Analog Input External Interface Embedded Pi MCU ISP(Program Interface)
Arduino Power Interface
Arduino ADC Interface
RPI Connecter
USB Micro-B
DC-005
(7V
–
16V)
STM32
Debug
Connecter
Bus Switch & 3V3/5V Voltage-level translate
IIC
SP
I
U
A
R
T
PW
M
CA
N
A
D
C
G
PI
O
IIC/SPI/UART/PWM/
ADC/GPIO/CAN IIC/SPI/UART/
PWM/GPIO
Raspberry Pi
Connector
Embedded Pi On
Board MCU
Arduino-Compatible
Embedded Pi Board
3 Power Source
(auto Switch)
-----------------
External DC
USB
RPI_5V
Embedded Pi Extended Interfaces:
1 SPI, 1 I2C, 1 UART with Flow Ctrl,
2 Pairs PWM(+-),6 Analog Input,
1 CAN
Arduino Form-factor Compatible
Interfaces:
1SPI, 1I2C, 4PWM, 1 UART,
6 Analog Input
Figure 3-1 Hardware block diagram
Besides the Arduino
TM
form-factor compatible interfaces onboard, Embedded Pi has some
additional SPI, IIC, UART interfaces, and some other extended interfaces like USB and CAN.
Users can use the MCU onboard or a connected Raspberry Pi to control Arduino
TM
shields via the
Arduino
TM
form-factor compatible interfaces. The following sections give a detailed introduction
of the operation modes and interfaces of Embedded Pi: 4 Operation Modes , 3.5 Arduino
TM
Form-factor Compatibility , 3.6 Embedded Pi Extended Interfaces , and 3.7 Raspberry Pi
Connector .
Embedded Pi has 3 power sources from which the power supply is auto-selected – USB
connection, an external DC power supply, or a Raspberry Pi. For more information, refer to
3.4
Power MCU .