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Guide for writing applications AN4594

10/16 DocID026958 Rev 1

4 Guide for writing applications

This chapter describes how to write applications which use sensors, based on the STM32

Nucleo board equipped with the sensor expansion board.

4.1 Relevant APIs for sensor applications

This section describes generic initialization and setup for writing sensor expansion board

applications.

4.1.1 Initialization

Every application must first execute the following basic initialization steps in order to

configure and set up the STM32 Nucleo with the sensor expansion board hardware and the

software stack for correct operation.

Initializing STM32Cube HAL

The STM32Cube HAL library must be initialized so that the necessary hardware

components are correctly configured.

• HAL_Init();

This API initializes the HAL library: it configures Flash prefetch, Flash preread and

Buffer Cache0; it also configures the time base source, vectored interrupt controller

and low-level hardware.

Initializing Nucleo board peripherals and sensor expansion board

Some of the Nucleo on-board peripherals, hardware and the sensor expansion board must

be configured before they are used. The functions to do this are:

• BSP_LED_Init(Led_TypeDef Led);

This API configures the LED on the Nucleo.

• BSP_PB_Init(Button_TypeDef Button, ButtonMode_TypeDef Button_Mode);

This API configures the user button in GPIO mode or in external interrupt (EXTI) mode.

• BSP_HUM_TEMP_isInitialized()

This API configures the temperature sensor (hts221) on the sensor expansion board.

• BSP_PRESSURE_isInitialized()

This API configures the pressure sensor (lps25h) on the sensor expansion board.

• BSP_IMU_6AXES_isInitialized()

This API configures accelerometer and gyroscope sensor (LSM6DS0) on the sensor

expansion board.

• BSP_MAGNETO_isInitialized

This API configures magnetometer sensor (LIS3MDL) on the sensor expansion board.

ST STM32 Nucleo Application Note

Other manuals for ST STM32 Nucleo