AN1278 datasheet(29/44 Pages) STMICROELECTRONICS

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LIN (LOCAL INTERCONNECT NETWORK) SOLUTIONS

4.2.1.2 lin_ai.c

The first part of the lin_ai.c code is the definition of the LIN frames the application has to

handle. Out of the 4 defined for the whole network the application handles the 3 following

frames:

The corresponding setting of “

ID_Table” is:

const t_id_list ID_Table[]=

{

{0x03, ID_DATASENT, 2},

{0x20, ID_DATAREQUEST, 4},

{0x80, ID_DATASENT, 8}

};

The second part of the lin_ai.c code consists of 3 notification functions and is the kernel of the

LIN communication. Filling the notification functions enables you to define the behaviour of the

application upon a master data request (

DataRequest_Notification function) upon the recep-

tion of data from the master (

DataReceived_Notification function) and upon errors

(

Error_Notification function).

Timeouts

One output compare of one timer

is needed for the timeouts han-

dling. We choose the output com-

pare 1 of timer A. So

“TIMEOUT_TIMERA” and

“TIMEOUT_OC1” are defined.

#define TIMEOUT_TIMERA

//#define TIMEOUT_TIMERB

#define TIMEOUT_OC1

//#define TIMEOUT_OC2

LIN baudrate

The example LIN baudrate is

9600 Baud.

#define BAUDRATE

9600

SCI peripheral registers

See Table 8. Example of

(BRR,ExPR) values versus

baudrate and fCPU.

//#define BRR

0xC9

//#define ExPR

0x00

Number of LIN frames to be han-

dled

The network communication con-

sists of 4 LIN frames. The appli-

cation example handles 3 of

them: DataToSlave1,

RequestToSlave1 and SleepMo-

deCommand.

#define ID_TABLE_SIZE

Resynchronization

Not supported using the on-chip

SCI peripheral. “RESYNCH” is

commented out.

//#define RESYNCH

Frame name

Identifier ID[7..0]

Message Length

Data Direction

DataToSlave1

0x03

master to slave1

RequestToSlave1

0x20

slave1 to master

SleepModeCommand

0x80

master to all slaves

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