Usart Virtual Communication; Solder Bridges; Table 7. Virtual Communication Configuration; Table 8. Solder Bridges - ST STM32 Nucleo-32 User Manual

Hardware layout and configuration
6.9

USART virtual communication

Thanks to SB2 and SB3, the USART interface of STM32 available on PA2 (TX) and PA15
(RX), can be connected to ST-LINK/V2-1. When USART is not used it is possible to use PA2
as Arduino Nano A7. Refer to
Bridge
SB2
SB3
1. The default configuration is reported in bold style.
6.10

Solder bridges

Bridge
SB10 (VREF+)
SB15 (LD3-LED)
SB9 (NRST)
SB11 (PB2/VSS)
SB13 (PB8/VSS)
SB12 (PB8/BOOT0)
SB16
20/37
Table 7.

Table 7. Virtual communication configuration

(1)
State
PA2 is connected to CN4 pin 5 as Arduino Nano analog input A7 and
OFF
disconnected from ST-LINK USART.
ON PA2 is connected to ST-LINK as virtual Com TX (default).
OFF PA15 is not connected.
ON PA15 is connected to ST-LINK as virtual Com RX (default).

Table 8. Solder bridges

(1)
State
ON VREF+ on STM32 is connected to VDD.
VREF+ on STM32 is not connected to VDD and it is provided by
OFF
pin 13 of CN4.
ON Green user LED LD3 is connected to D13 of Arduino Nano signal.
OFF Green user LED LD3 is not connected.
The NRST signal of ST-LINK is connected to the NRST pin of the
ON
STM32.
The NRST signal of ST-LINK is not connected to the NRST pin of
OFF the STM32, when used external power (+3V3, +5 V) as power
supply.
ON Pin 16 of STM32 (U2) is connected to VSS.
Pin 16 of STM32 (U2) is not connected to VSS, and used as GPIO
OFF
PB2 for STM32F031.
ON Pin 32 of STM32 (U2) is connected to VSS.
Pin 32 of STM32 (U2) is not connected to VSS, and used as GPIO
OFF
PB8 for STM32F031.
Pin 31 of STM32 (U2) is connected to GND via 10K pull-down and
ON
used as BOOT0.
Pin 16 of STM32 (U2) is not connected and is GPIO PB8 for
OFF
STM32F042.
STM32 PB6 is connected to CN4 pin 7 for I
ON Arduino Nano A5. In such case STM32 PB6 does not support
Arduino Nano D5 and PA6 must be configured as input floating.
UM1956 Rev 5
Description
Description
2
C SDA support on
UM1956