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2.4 SPI Flash
A 16Mbit SPI flash is used for the WICED SDK WLAN firmware. The WLAN firmware is approximately 356
kB. The remaining SPI flash space can be used by applications via the standard serial flash interface
library within the WICED SDK.
2.5 User I/O
The board provides a pushbutton switch (S1) and several bi-color LEDs (LED1, LED2, LED3). The
pushbutton switch S1 is attached to port PA1. LED1.green is power indication. LED1.red displays activity
on UART1 activity. The LED2 red and green are connected to PD8 and PD9 respectively. LED3 red and
green are connected to PD10 and PD11.
2.6 Micro-SD Slot
The board provides a Micro-SD slot attached to the SPI1 interface on the STM32F411 MCU. The
interface mode is SPI and the chip select is connected to PA3 on the Discovery Board.
2.7 Bluetooth Audio Header
The Bluetooth Audio Header (J4) provides access to the I2S and PCM signals from the Sterling-LWB
module.
The information in this document is subject to change without notice.
330-0234-R1.2
Copyright ©2016-2017 LSR
Sterling-LWB STM Expansion Board
USER GUIDE
Page 6 of 25
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