AN1278 datasheet(20/44 Pages) STMICROELECTRONICS

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LIN (LOCAL INTERCONNECT NETWORK) SOLUTIONS

#define RESYNCH

3.4 APPLICATION INTERFACE: LIN_AI.C

This file is the application interface and should be filled by the user. In this way the user can

define the LIN communication of his application.

The lin_ai.c file consists of:

The ID_Table variable

You fill this variable to define the identifiers of the LIN frames that the application has to

handle.

Each member of this list corresponds to a LIN frame and its corresponding identifier. Each

member is of type

t_id_list (See 3.2.1 Type definition) and has to be defined in the following

way:

{

identifier, direction, data length}

identifier represents the whole identifier byte including the parity bits.

direction represents the data flow direction, is of type t_message_direction and should there-

fore be set to

ID_DATAREQUEST for data being requested by the master and to be sent by

the application/slave or to

ID_DATASENT for data being sent by the master to the application/

slave.

data length represents the number of data bytes of the corresponding frame. It can be set be-

tween 0 to 8.

Note: The LIN protocol specification gives some advice concerning the coding of the data

length through the ID5 and ID4 bits in the identifier byte. But this coding is no longer manda-

tory since revision 1.2 of the specification.

The number of members has to be entered in the lin_config.h file (See 3.3 LIN Configuration

File: lin_config.h).

3 Notification functions

The LIN software is interrupt driven which means you do not have to poll any variables to

handle LIN communication. When activity appears on the LIN bus, the LIN interrupt service

routine is entered and starts decoding the LIN frame. Once the LIN software is able to notify an

#define

RESYNCH

description

Can only be defined if UART_TIMERA or

UART_TIMERB has been defined.

If the application is working with an inaccurate clock

the LIN software is able to resynchronize to the

master clock (refer to the LIN protocol). Define this

symbol to activate this feature.

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