CAN communication function

Function name	Function
onCanxStart	Enable CAN communication
onCanxstop	Close CAN communication
setBitrate	Set CAN communication rate
addFillter	Set the ID filter
reciveData	Receive CAN data
sendData	Send CAN data

1、onCanxStart              

[Description]

Enable CAN communication

Normal return value =0, error return value <0

[Usage]

int onCanxStart(PortID);

[Example]

    int PortID , Result;

    PortID = 0; //0：COM0    1：COM1

    Result = 0;

    Result = onCanxStart (PortID);

2、onCanxstop        

[Description]

Close CAN communication

Normal returns 0, error returns non-0

[Usage]

int onCanxstop (PortID);

[Example]

    int PortID , Result;

    PortID = 0; //0：COM0    1：COM1

    Result = 0;

    Result = onCanxstop (PortID);

3、setBitrate           

[Description]

Set CAN communication rate

Normal returns 0, error returns non-0

[Usage]

int setBitrate (Bitrate,PortID);

[Example]

       int PortID, Bitrate, Result;

       PortID    = 0;        //0：COM0    1：COM1

       Bitrate = 5*1000;              // Set the baud rate 5K set range 5K 10K 20K maximum to 1M

       Result = 0;

       Result = setBitrate ( Bitrate, PortID )// COM0 sets the communication rate to 5000

4、addFillter                   

[Description]

Set the ID filter

Normal returns 0, error returns non-0

[Usage]

int addFillter ( CanID, CanMask, PortID );

[Example]

    Int PortID, Result, CanID, CanMask;

       PortID = 0;                 //0：COM0    1：COM1

       Result = 0;

       CanID  = 0x11;         // Set the filter start ID number

       CanMask = 0x11;      // Set the filter end ID number, and start and end can be the same

       Result = addFillter ( CanID, CanMask, PortID );   // Set to receive only data with CAN ID 0x11 normally returns 0 error returns non-0 value

0000 1100 1111 0000 0000 0100 0000 0001 0x0CF00401 0001 1000 1111 1110 1110 1110 0000 0000 0x18FEEE00 0001 1000 1111 1110 1111 0010 0000 0000 0x18FEF200 MASK 1110 1011 1111 0001 0000 0001 1111 1110 0x0BF101FE addfillter(0x0CF00401, 0x0BF101FE, canport);

5、reciveData          

[Description]

Receive CAN data

Normal return received data length, error return data length <0

[Usage]

int reciveData ( data, Len, PortID, &CanId )

[Example]

       int PortID, Result, Len;

       unsigned int CanId;

       unsigned char data[128];              // Receive data buffer

       PortID    = 0;                             //0：COM0    1：COM1

       Len = 128;                                       // Receive buffer length

       Result = reciveData ( ( unsigned char * ) data, Len, PortID, &CanId );

6、sendData                   

[Description]

Send CAN data

Normal returns 0, error returns non-0

[Usage]

int sendData ( data, Len, PortID, CanId, CanType )

[Example]

       int PortID, Result, Len, CanType, CanId, i;

       unsigned char data[128];

       PortID    = 0;        //0：COM0    1：COM1

       Result    = 0;

       Len        = 8;

       CanId    = 0x22;

       CanType       = 0;        // Frame type: standard frame: 0 extended frame:0x80000000

       for ( i = 0; i < Len; ++i )

       {

              data[i] = i;

       }

       Result = sendData ( ( unsigned char * ) data, Len, PortID, CanId, CanType );// Standard frame, COM0 sends data data, length 127,CAN ID 0x22