Uart2 Communication; Leds; Table 8. Uart2 Pins - ST STM32 Nucleo-64 User Manual

UM2324
6.9

UART2 communication

The UART2 interface of the STM32 is connectible to:
•
The ST-LINK/V2-1 MCU
• The ST morpho connector (CN10 pin 6 and pin 34)
Pin
name
PA2
PA3
6.10

LEDs

Four LEDs are available on the STM32 NUCLEO-G070RB or NUCLEO-G071RB board.
The four LEDs are located on the top side of the board.
1. LD1 COM: LD1 is a bi-color LED. LD1 default status is red. LD1 turns to green to
indicate that communication is in progress between the PC and the ST-LINK/V2-1 as
follow:
–
–
–
–
–
–
–
2. LD2: 5V_USB_CHG: this red LED switch ON when overcurrent is detected on USB
VBUS. The LED gives the information that more than 500 mA is requested on VBUS.
In this case it is recommended to supply the board with E5V, VIN or in
USB_CHARGER mode.
3. LD3: 5V_PWR: this green LED is ON when the STM32 NUCLEO-G070RB or
NUCLEO-G071RB board is powered by a 5 V source.
4. LD4 USER: this green LED is a user LED connected to Arduino signal D13
corresponding to STM32 I/O PA5. To light the LED a high-logic state '1' has to be
written in the corresponding GPIO. A transistor is used to drive the LED when the I/O
voltage is 1.8 V. LD4 consumption does not impact the VDD STM32 power
measurement, since LD4 is isolated from it.
Virtual COM port (default
Function
UART2 TX
UART2 RX
Slow blinking red and off: at power-on before USB initialization
Fast blinking red and off: after the first correct communication between the PC and
the STLINK/V2-1 (enumeration)
Red LED on: when initialization between the PC and the ST-LINK/V2-1 is
successfully ended
Green LED on: after successful STM32 communication initialization
Blinking red and green: during communication with STM32
Green on: communication well ended
Orange on: communication ended with failure

Table 8. UART2 pins

configuration)
SB16 ON
SB18 ON
UM2324 Rev 2
Hardware layout and configuration
ST morpho connection
SB16 OFF
SB18 OFF
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