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

UM2248
Features dropped:
•
SWIM interface
The USB connector (CN21) can be used to power STM32L4R9I-EVAL regardless of the ST-
LINK/V21 facility used for debugging or for flashing STM32L4R9AII6. This holds also when
the ST-LINK/V2 standalone tool is connected to the CN12, CN17, CN11, or CN15 connector
and used for debugging or flashing STM32L4R9AII6.
powering STM32L4R9I-EVAL.
For full detail on both versions of the debug and flashing tool, the standalone 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
LINK/V2-1 must be installed. It is available from www.st.com.
In case the STM32L4R9I-EVAL main board is connected to the PC before installing the
driver, the Windows device manager might 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. 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 might 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 trace connector (CN12) 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.

Figure 8. USB Composite Device

UM2248 Rev 5
Hardware layout and configuration
Section 6.5 provides more details on
®
8 or older PC via USB, a driver for ST-
Figure 8.
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