St-Link/V2-1; Drivers; Figure 4. Usb Composite Device - STMicroelectronics STM32L476G-EVAL User Manual

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2.1

ST-LINK/V2-1

ST-LINK/V2-1 facility for debug and flashing of STM32L476ZGT6, is integrated on the
STM32L476G-EVAL evaluation board.
Compared to ST-LINK/V2 stand-alone tool available from STMicroelectronics, ST-LINK/V2-
1 offers new features and drops some others.
New features:
•
USB software re-enumeration
•
Virtual COM port interface on USB
•
Mass storage interface on USB
•
USB power management request for more than 100mA power on USB
Features dropped:
•
SWIM interface
The USB connector CN17 can be used to power STM32L476G-EVAL regardless of
ST-LINK/V2-1 facility use for debugging or for flashing STM32L476ZGT6. This holds also
when ST-LINK/V2 stand-alone tool is connected to CN12 or CN15 connector and used for
debugging or flashing STM32L476ZGT6.
STM32L476G-EVAL.
For full detail on both versions of the debug and flashing tool, the stand-alone ST-LINK/V2
and the embedded ST-LINK/V2-1, refer to www.st.com.
2.1.1

Drivers

Before connecting STM32L476G-EVAL to a Windows 7, Windows 8 or Windows XP PC via
USB, a driver for ST-LINK/V2-1 must be installed. It can be downloaded from www.st.com.
In case the STM32L476G-EVAL evaluation board is connected to the PC before installing
the driver, the Windows device manager may report some USB devices found on
STM32L476G-EVAL as "Unknown". To recover from this situation, after installing the
dedicated driver downloaded from www.st.com, the association of "Unknown" USB devices
found on STM32L476G-EVAL to this dedicated driver must be updated in the device
manager manually. It is recommended to proceed using USB Composite Device line, as
shown in Figure 4.

Figure 4. USB Composite device

DocID027351 Rev 3
Hardware layout and configuration
Section 2.3 provides more detail on powering
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