AN1278 datasheet(28/44 Pages) STMICROELECTRONICS

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LIN (LOCAL INTERCONNECT NETWORK) SOLUTIONS

The application can also be woken up by a sensor connected to one pin of the ST7 and then

should also wake up the whole LIN network. For this a wake-up frame has to be sent, which is

done by the “

LIN_SendWakeUpSignal()” function. This function is therefore inserted in the ap-

plication wake-up interrupt:

The software is ready!

4.2 IMPLEMENTATION ON THE ST72334N4 - HARDWARE SCI

4.2.1 Step by Step Configuration

4.2.1.1 lin_config.h

@interrupt void PORTS_0_Interrupt(void)

{

unsigned char i;

i=250;

while(i--);

if(!(PADR&0xFE))

{

PAOR&=0xFE;

LIN_SendWakeUpSignal();

}

Setting group

Comments

Text line in lin_config.h

CPU operating frequency

An external 16 MHz resonator is

used. As a result the internal

CPU frequency is 8 MHz. So

“FCPU” is set to 8000000.

#define FCPU

8000000

Communication peripheral

The ST72334N4 has an on chip

SCI peripheral. As a result “SCI”

is defined, “UART_TIMERA” and

“UART_TIMERB” are comment-

ed out.

//#define UART_TIMERA

//#define UART_TIMERB

#define SCI

LIN RX and LIN TX pin definitions

These are not needed when us-

ing an on-chip SCI peripheral. All

symbols are commented out.

//#define UART_IC1

//#define UART_IC2

//#define UART_OC1

//#define UART_OC2

//#define LIN_PORT_ADD

0x04

//#define LIN_RX_PINNB

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