Advantech PCI-1682U Bedienungsanleitung PDF herunterladen (Seite 61)

55 PCI-1680U/1682U User Manual

Chapter 4 Software Requirements

4.5.2 How to send Extended frame, compatible with CAN 2.0B.

DWORD dwWrite=0;

canmsg_t WriteBuffer;

ZeroMemory(&WriteBuffer, sizeof(canmsg_t));

WriteBuffer.flags = MSG_EXT; //Extended frame

WriteBuffer.id = 0;

WriteBuffer.length = 8;

for(int i=0; i<8; i++)

{

WriteBuffer.data[i] = i;

}

WriteFile(hDevice, &WriteBuffer, 1, &dwWrite, 0);

4.5.3 How to send RTR frame.

DWORD dwWrite=0;

canmsg_t WriteBuffer;

ZeroMemory(&WriteBuffer, sizeof(canmsg_t));

WriteBuffer.flags = 0; //Standard frame

//WriteBuffer.flags = MSG_EXT; //Extended frame

WriteBuffer.flags |= MSG_RTR; //Remote frame

WriteBuffer.id = 0;

WriteBuffer.length = 0;

WriteFile(hDevice, &WriteBuffer, 1, &dwWrite, 0);

4.5.4How to dispose received messages.

DWORD dwRead;

canmsg_t ReadBuffer;

ZeroMemory(&ReadBuffer, sizeof(canmsg_t));

BOOL bSuccess = ReadFile(hDevice, &ReadBuffer, 1, &dwRead,

0);

if(bSuccess)

{

if(dwRead == 1)

{

//SUCCESS

if(ReadBuffer.flags & MSG_EXT)

{

//Extended frame

}

else{

//Standard frame

}

if(ReadBuffer.flags & MSG_RTR)

{

//Remote frame

}

if(ReadBuffer.flags & MSG_SELF)

{

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