AN1105 datasheet(73/100 Pages) STMICROELECTRONICS

номер детали	AN1105

подробное описание детали	ST7 pCAN PERIPHERAL DRIVER

PDF	100 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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73 / 100 page

73/100

ST7 pCAN PERIPHERAL DRIVER

message_ident = (((unsigned int)CANIDHR)<<8)|CANIDLR;

message_ident >>= FILTER_SHIFT;

//Appropriate rigth shift

message_ident &= 0xFFF0;

//Filtering function

#ifdef FILTERS_ENABLED

/*Conditionnal compilation*/

filtering_status=CAN_Filter(message_ident);

//Filtering fonction call

if (filtering_status==CAN_FILTER_NO_MATCH)

{

Clr_RDY_Bit();

//Frees the hardware buffer for a

new reception

return CAN_FILTERING_FAILURE;

}

#endif

//Tests if remote frame

if(ValBit(CANIDLR,4))

{

Clr_RDY_Bit();

CAN_Remote_Reception_Notification(message_ident);

return CAN_RECEIVE_REMOTE;

}

//Else, saves the datas in a buffer passed by the application

soft_buffer_ptr=CAN_Request_Buffer(message_ident); //Requests a buffer for

the messsage that successfully passed the filters

if (soft_buffer_ptr==NULL)

//The buffer must exist prior to beeing filled

!!!

{

Clr_RDY_Bit();

return CAN_NO_BUFFER;

//Kind of "software overrun"

}

if (soft_buffer_ptr->buffer_rw)

{

Clr_RDY_Bit();

return CAN_RECEIVE_FATAL;

}

soft_buffer_ptr->buffer_rw=CTRUE;//Locks the buffer

if (!(soft_buffer_ptr->buffer_free))

{

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