Advantech PCI-1682U Bedienungsanleitung PDF herunterladen (Seite 55)

49 PCI-1680U/1682U User Manual

Chapter 4 Software Requirements

4.4.1 canmsg_t

When users directly use ReadFile or WriteFile interface of Windows Native API to

call drivers, this structure is needed.

typedef struct {

int flags;

int cob;

ULONG id;

short int length;

UCHAR data[ 8 ];

} canmsg_t;

Member Description

Remarks

8-bit flags are used to record types of messages during sending or receiving. The

meanings of these bits are:

ID shows type of CAN. When ID is 0xFFFFFFFF, it means error frame, which implies

that hardware overrun, error and busoff occur in drivers. Users can get the specific

type from flags.

If ID does not equal 0xFFFFFFFF, flags may be Remote frame, Extended frame,

Standard frame, Self Reception or software overrun.

Name Description

flags Types of messages.

cob Reserved.

id ID of message.

length of messages (0~8).

data Data transferred (Made up of 0°´8 Byte data).

Bit Declaration Meaning Description

0 MSG_RTR RTR

1 means Remote frame, 0 means data

frame.

1 MSG_OVR

Hardware OVER-

RUN

1 means receive buffer overrun of hardware.

2 MSG_EXT Extension

1 means Extended frame(29 bit identifier), 0

means Standard frame(11 bit identifier).

3 MSG_SELF Self Reception

1 means self sending and receiving frame, 0

means receiving frame from other ports.

4 MSG_PASSIVE Error 1 means bus error.

5 MSG_BUSOFF BUSOFF 1 means busoff.

6 Reserved Reserved

7 MSG_BOVR Software OVERRUN 1 means receive buffer overrun of software.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 103 104

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