AN1278 datasheet(27/44 Pages) STMICROELECTRONICS

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LIN (LOCAL INTERCONNECT NETWORK) SOLUTIONS

application updating it with the latest data and the LIN communication sending its content on

request of the master. The corresponding code for the “

DataRequest_Notification” function is:

Data reception (

DataReceived_Notification)

The application handles 2 “data” frames from the master corresponding to the identifier 0x03

and 0x80. The first frame is part of the “normal” communication. The second frame is a sleep

command frame that can be sent by the master at any time to interrupt normal communication

and set all nodes into low power mode.

On reception of the first frame the application saves the received data into the variable

“

master_data[]“.

On reception of the sleep command frame the application sets the ST7 in Halt mode. Before

setting the ST7 in Halt mode the wake-up sources should be acitivated. An application func-

tion, “PORTS_WakeUp_On()“, is called. Two pins are configured as interrupt and will wake

the ST7 up on a corresponding interrupt request. The first pin is the Laniards pin. As a result

any bus activity will wake the application up. The second is an application pin that should be

also able to wake up the application.

The corresponding code for the “

DataReceived_Notification” function is:

Any activity on the bus will wake up the ST7 out of Halt mode. As soon as the ST7 is ready to

execute the next instruction any incoming frame can be received.

extern uByte slave_data[];

uByte * DataRequest_Notification(@tiny t_header *header)

{

if(header->identifier == ID_Table[1].id){

return(slave_data);

}

extern uByte master_data[];

void DataReceived_Notification(@tiny t_header *header, @tiny t_response *re-

sponse)

{

if(header->identifier == ID_Table[0].id){

master_data[0]=response->data[0];

master_data[1]=response->data[1];

}

else if(header->identifier == ID_Table[2].id){

PORTS_WakeUp_On();

_asm("halt\n");

}

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