UM1879 Rev 4 13/41
UM1879 Hardware layout and configuration
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10.1 Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the STM32L476
Discovery board. Compared to ST-LINK/V2 the changes are listed below.
The new features supported on ST-LINK/V2-1 are:
• 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
These features are no more supported on ST-LINK/V2-1:
• SWIM interface
• Application voltage lower than 3 V
For all general information concerning debugging and programming features common
between V2 and V2-1 refer to ST-LINK/V2 in-circuit debugger/programmer for STM8 and
STM32 User manual (UM1075).
There are two different ways to use the embedded ST-LINK/V2-1 depending on the jumper
states:
• Program/debug the STM32L476VGT6 on board (Section 10.1.3)
• Program/debug an STM32 in an external application board using a cable connected to
SWD connector CN4 (Section 10.1.4)
.
10.1.1 Drivers
The ST-LINK/V2-1 requires a dedicated USB driver, which can be found on the www.st.com
website.
In case the STM32L476 Discovery board is connected to the PC before the driver is
installed, some interfaces may be declared as “Unknown” in the PC device manager. In this
case the user must install the driver files, and update the driver of the connected device
from the device manager.
Table 3. Jumper states
Jumper state Description
Both CN3 jumpers ON ST-LINK/V2-1 functions enabled for on-board programming (default)
Both CN3 jumpers OFF
ST-LINK/V2-1 functions enabled for external board through external
CN4 connector (SWD supported)
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