/*****************************************************************************
*
* acWaitEvent
*
* Purpose:
* Wait can message or error of the CAN Controller.
*
*
* Arguments:
* msgRead - managed buffer for read
* nReadCount - msg number that unmanaged buffer can preserve
* pulNumberofRead - real msgs have read
* ErrorCode - return error code when the CAN Controller has error
*
* Returns:
* =0 SUCCESS; or <0 failure
*
*****************************************************************************/
public int acWaitEvent(AdvCan.canmsg_t[] msgRead, uint nReadCount, ref uint pulNumberofRead, ref uint ErrorCode)
{
int nRet = OPERATION_ERROR;
if (AdvCan.WaitCommEvent(hDevice, lpEventCode, GCEvent.AddrOfPinnedObject()) == true)
{
EventCode = Marshal.ReadInt32(lpEventCode, 0);
if ((EventCode & AdvCan.EV_RXCHAR) != 0)
{
nRet = acCanRead(msgRead, nReadCount, ref pulNumberofRead);
}
if ((EventCode & AdvCan.EV_ERR) != 0)
{
nRet = OPERATION_ERROR;
acClearCommError(ref ErrorCode);
}
}
else
{
uint err = AdvCan.GetLastError();
if (AdvCan.ERROR_IO_PENDING == err)
{
if (AdvCan.GetOverlappedResult(hDevice, GCEvent.AddrOfPinnedObject(), ref pulNumberofRead, true))
{
EventCode = Marshal.ReadInt32(lpEventCode, 0);
if ((EventCode & AdvCan.EV_RXCHAR) != 0)
{
nRet = acCanRead(msgRead, nReadCount, ref pulNumberofRead);
}
if ((EventCode & AdvCan.EV_ERR) != 0)
{
nRet = OPERATION_ERROR;
acClearCommError(ref ErrorCode);
}
}
else
{
nRet = OPERATION_ERROR;
}
}
else
{
nRet = OPERATION_ERROR;
}
}
return(nRet);
}
/*****************************************************************************
*
* acCanWrite
*
* Purpose:
* Write can msg
*
*
* Arguments:
* msgWrite - managed buffer for write
* nWriteCount - msg number for write
* pulNumberofWritten - real msgs have written
*
* Returns:
* =0 SUCCESS; or <0 failure
*
*****************************************************************************/
public int acCanWrite(AdvCan.canmsg_t[] msgWrite, uint nWriteCount, ref uint pulNumberofWritten)
{
bool flag;
int nRet;
uint dwErr;
if (nWriteCount > MaxWriteMsgNumber)
{
return(OPERATION_ERROR);
}
pulNumberofWritten = 0;
//Copy data from managed structure to unmanaged buffer
for (int i = 0; i < nWriteCount; i++)
{
if (OS_TYPE == 8)
{
Marshal.StructureToPtr(msgWrite[i], new IntPtr(orgWriteBuf.ToInt64() + (AdvCan.CAN_MSG_LENGTH * i)), true);
}
else
{
Marshal.StructureToPtr(msgWrite[i], new IntPtr(orgWriteBuf.ToInt32() + (AdvCan.CAN_MSG_LENGTH * i)), true);
}
}
flag = AdvCan.WriteFile(hDevice, orgWriteBuf, nWriteCount, ref pulNumberofWritten, GCWrite.AddrOfPinnedObject()); //Send frame
if (flag)
{
if (nWriteCount > pulNumberofWritten)
{
nRet = TIME_OUT; //Sending data timeout
}
else
{
nRet = SUCCESS; //Sending data ok
}
}
else
{
dwErr = AdvCan.GetLastError();
if (dwErr == AdvCan.ERROR_IO_PENDING)
{
if (AdvCan.GetOverlappedResult(hDevice, GCWrite.AddrOfPinnedObject(), ref pulNumberofWritten, true))
{
if (nWriteCount > pulNumberofWritten)
{
nRet = TIME_OUT; //Sending data timeout
}
else
{
nRet = SUCCESS; //Sending data ok
}
}
else
{
nRet = OPERATION_ERROR; //Sending data error
}
}
else
{
nRet = OPERATION_ERROR; //Sending data error
}
}
return(nRet);
}