Leds; Push-Buttons; Jp6 (Idd) - ST STM32 User Manual

UM1724
6.4

LEDs

The tricolor LED (green, orange, red) LD1 (COM) provides information about ST-LINK
communication status. LD1 default color is red. LD1 turns to green to indicate that
communication is in progress between the PC and the ST-LINK/V2-1, with the following
setup:
• Slow blinking Red/Off: at power-on before USB initialization
•
Fast blinking Red/Off: after the first correct communication between the PC and
ST-LINK/V2-1 (enumeration)
•
Red LED On: when the initialization between the PC and ST-LINK/V2-1 is complete
•
Green LED On: after a successful target communication initialization
•
Blinking Red/Green: during communication with the target
•
Green On: communication finished and successful
•
Orange On: Communication failure
User LD2: the green LED is a user LED connected to ARDUINO
to STM32 I/O PA5 (pin 21) or PB13 (pin 34) depending on the STM32 target. Refer to
Table 11
•
the I/O is HIGH value, the LED is on
•
the I/O is LOW, the LED is off
LD3 PWR: the red LED indicates that the STM32 part is powered and +5V power is
available.
6.5

Push-buttons

B1 USER: the user button is connected to the I/O PC13 (pin 2) of the STM32
microcontroller.
B2 RESET: this push-button is connected to NRST, and is used to RESET the STM32
microcontroller.
Note: The blue and black plastic hats that are placed on the push-buttons can be removed if
necessary, for example when a shield or when an application board is plugged on top of the
Nucleo board. This will avoid pressure on the buttons and consequently a possible
permanent target STM32 RESET.
6.6

JP6 (IDD)

Jumper JP6, labeled IDD, is used to measure the STM32 microcontroller consumption by
removing the jumper and by connecting an ammeter:
•
Jumper ON: STM32 microcontroller is powered (default).
•
Jumper OFF: an ammeter must be connected to measure the STM32 microcontroller
current. If there is no ammeter, the STM32 microcontroller is not powered.
to Table 23 when:
UM1724 Rev 14
Hardware layout and configuration
®
signal D13 corresponding
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