AN3985 datasheet(99/105 Pages) STMICROELECTRONICS

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AN3985

Application example

Doc ID 022255 Rev 2

99/105

8.5

Compilation management

This firmware embeds all the commands of CR95HF devices, LRIxK and M24LRxx

contactless tag. Furthermore, some advanced functionalities are available such as the tag

detection state or the read/write multiple block process. All these features consume memory

space and can be removed to minimize the code size.

8.5.1

Conditional compilation

In order to save STM8L memory space, several actions have been performed. The main

one is the conditional compilation. This allows to determine what is needed. There are three

levels of conditional compilation.

Level 1: STM8L15x_StPeriph_Driver

All the functions that are not called within the library are not compiled. In order to use those

functions, there are two solutions:

Solution 1: Locate in the .h file of the peripheral concerned the following command (right

after the includes) //#define

USE_FULL_"peripheral concerned"_ Board

(a) and

uncomment the line. As a consequence, all the functions will become available.

Solution 2: Locate the function to release and erase the #ifdef

USE_FULL_"peripheralconcerned"_ Board

and #endif commands. If the function

is in a group of functions, insert a #endif before the function and a #ifdef

USE_FULL_"peripheralconcerned"_ Board

right after. This procedure should be

done in both the .c and the .h files.

Level 2: Board Specificities

This level is completely transparent because it is related to boards. The specific I/O

configurations linked to one board (STM8L 1528-Eval for example) are not compiled on the

other board (STM8L Discovery for example).

Level 3: Functionalities

Several functionalities are available within the libraries. Table 149 lists the functionalities and

the commands to uncomment to use them.

Where "peripheral concerned" is the name of the peripheral as written in its file.

Table 149.

Functionalities description

Name of the

functionality (brief)

Description

Code line to

uncomment

Location

STM8L-1528 Eval

To use the STM8L-

1528 Eval board

#define

BOARD_SELECTED_EV

ALBOARD

Board_config.h

STM8L-Discovery

Board

To use the STM8L-

Discovery board

#define

BOARD_SELECTED_DI

SCOVERYBOARD

Board_config.h

RTC clock function

Used in Low Power

Mode, allows to

generate an interruption

at programmed time

#define

USE_RTC_CLOCK_FUN

CTION

Board_config.h

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