Peripherals; Push Buttons And Leds - Silicon Laboratories EFR32xG21B User Manual

5. Peripherals

The starter kit has a set of peripherals that showcase some of the features of the EFR32.
Be aware that most EFR32 I/O routed to peripherals are also routed to the breakout pads or the EXP header. This must be taken into
consideration when using these.

5.1 Push Buttons and LEDs

The kit has two user push buttons marked PB0 and PB1. They are connected directly to the EFR32 and are debounced by RC filters
with a time constant of 1 ms. The buttons are connected to pins PB00 and PB01.
The kit features a total of four LEDs controlled by two GPIO pins on the EFR32. Two yellow LEDs, marked LED0 and LED1, are located
on the Wireless STK Mainboard. A red/green LED is located on the BRD4181C itself. The LEDs are connected such that PD02 controls
LED0 on the Wireless STK Mainboard and the red LED on BRD4181C. PD03 controls LED1 on the Wireless STK Mainboard and the
green LED on BRD4181C. The LEDs are all controlled in an active-high configuration.
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UIF_LED0
PD02 (GPIO)
UIF_LED1
PD03 (GPIO)
UIF_PB0
PB00 (GPIO)
UIF_PB1
PB01 (GPIO)
EFR32
Figure 5.1. Buttons and LEDs
UG428: EFR32xG21B 2.4 GHz 10 dBm Wireless Starter Kit User's Guide
R/G LED
RADIO BOARD
User Buttons
& LEDs
MAINBOARD
Peripherals
Rev. 1.0 | 16