UM2819
Embedded ST-LINK/V2-1
The connector is a standard USB Micro-B connector.
Table 5. USB Micro-B connector CN15 (front view)
7.4.4 Virtual COM port: USART1
The STM32WB55RG handles a USB Full Speed peripheral, available on the CN1 USB Micro-B connector.
It can communicate with a USB host as a USB device and can supply the board.
The related pinout of the CN1 USB Micro-B connector is listed in Table 5.
Table 5. USB Micro-B connector CN1(front view)
7.4.5 Virtual COM port: USART1
ST-LINK/V2-1 offers a USB Virtual COM port bridge. This feature gives access to the USART1 of the
STM32WB55RG by the CN15 USB ST-LINK connector.
By default, this USART1 interface of STM32WB55RG is connected to the UART2 port of the ST-LINK/V2-1 MCU
(STM32F103).
This VCP can be used differently with an intermediate connection. On the CN14 connector both TX and RX
signals are available and two solder bridges can disconnect the UART coming from SoC.
Table 6. UART interface pinout description
STLINK_TX: UART2 TX (PA2/pin 12)
STLINK_RX: UART2 RX (PA3/pin 13)
7.4.6 Level shifter
NUCLEO-WB55RG has a system to supply STM32WB55RG with a different voltage than ST-LINK. The ST-LINK
is always supplied by 3.3 V sources. By default, STM32WB55RG is supplied by the same voltage value as
ST-LINK, but it is possible to supply the SoC with another value. It accepts a voltage between 1.8 and 3.3 V trust
to a level shifter. This specific component assures the voltage conversion between the ST-LINK and the SoC. It
drives SWD and UART signals connected to VCP on ST-LINK.
To Next Page
Loading...
Need help?
General
