Drivers; St-Link/V2-1 Firmware Upgrade; Etm Trace; Figure 8. Usb Composite Device - ST STM32L4R9I-EVAL User Manual

Hardware layout and configuration
Features dropped:
•
SWIM interface
The CN21 USB connector can be used to power STM32L4R9I-EVAL regardless of the
ST-LINK/V2-1 facility use for debugging or for flashing STM32L4R9AII6. This holds also
when the ST-LINK/V2 stand-alone tool is connected to CN12, CN17, CN11, or CN15
connector and used for debugging or flashing STM32L4R9AII6.
details on powering STM32L4R9I-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.
6.3.1

Drivers

Before connecting STM32L4R9I-EVAL to a Windows (XP, 7, 8 10) PC via USB, a driver for
ST-LINK/V2-1 must be installed. It is available from www.st.com.
In case the STM32L4R9I-EVAL board is connected to the PC before installing the driver, the
Windows device manager may report some USB devices found on STM32L4R9I-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 STM32L4R9I-EVAL
to this dedicated driver must be updated in the device manager manually. It is recommended
to proceed using the USB Composite Device line, as shown in
6.3.2

ST-LINK/V2-1 firmware upgrade

For its operation, ST-LINK/V2-1 employs a dedicated MCU with Flash memory. Its firmware
determines ST-LINK/V2-1 functionality and performance. The firmware may evolve during
the life span of STM32L4R9I-EVAL to include new functionality, fix bugs, or support new
target microcontroller families. It is therefore recommended to keep ST-LINK/V2-1 firmware
up to date. The latest version is available from www.st.com.
6.4

ETM trace

The CN12 connector is available to output trace signals used for debugging. By default, the
Evaluation board is configured such that, STM32L4R9AII6 signals PE2, PE5, and PE6 are
not connected to trace outputs Trace_CK, Trace_D2, and Trace_D3 of CN12. They are
used for other functions.
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Figure 8. USB composite device

UM2248 Rev 4
UM2248
Section 6.5 provides more
Figure 8.