AN3108 datasheet(11/44 Pages) STMICROELECTRONICS

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AN3108

STLM75 library firmware

Doc ID 16793 Rev 1

11/44

STLM75 library firmware

This section describes the API and HAL layer implementation. Each library firmware

function is described in detail. API and HAL layer functions are fully described. An example

of how to use API functions is included. No example for HAL functions is provided because

the final application should manage the STLM75 temperature sensor through the API layer

functions only, without any direct access to the HAL functions.

The functions are described in the following format:

4.1

API layer firmware overview

The application programming interface layer allows the final application to easily use the

STLM75 temperature sensor. An OOP approach is used, making it possible for the

application to create and use one or more instances of a TempSensor object.

The TempSensor structure is seen by the application as an object with encapsulate

properties and methods. All read/write operations on the temperature sensors are executed

through this object. It is an advanced structure containing:

●

Properties as data fields

●

Methods as functions pointers

In this way, each API function belongs to the related TempSensor object instance and more

instances, and then more temperature sensors, can be managed without any conflicts.

In addition, the library exports two public API global functions in order to create/destroy a

TempSensor structure instance:

●

NewTempSensorObj function

●

DelTempSensorObj function

Table 3.

Function description format

Name

Description

Function name

The name of the peripheral function

Function prototype

Prototype declaration

Behavior description

Brief explanation of how the function is executed

Input parameter {x}

Description of the input parameters

Output parameter {x}

Description of the output parameters

Return value

Value returned by the function

Required preconditions

Requirements before calling the function

Called functions

Other library functions called

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