AN1105 datasheet(73/100 Pages) STMICROELECTRONICS

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))

{

AN1105 데이터시트(PDF) 73 Page - STMicroelectronics

AN1105 데이터시트(HTML) 73 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

데이터시트 다운로드

링크 URL