/*****************************************************************************
*
* 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
*
*****************************************************************************/
private int acCanWrite(Can.CanDriver.canmsg_t[] msgWrite, uint nWriteCount, ref uint pulNumberofWritten)
{
bool flag;
int nRet;
uint dwErr;
if (nWriteCount > MaxWriteMsgNumber)
{
nWriteCount = MaxWriteMsgNumber;
}
pulNumberofWritten = 0;
flag = CanDriver.WriteFile(hDevice, msgWrite, nWriteCount, out pulNumberofWritten, this.txOvr.memPtr);
if (flag)
{
if (nWriteCount > pulNumberofWritten)
{
nRet = TIME_OUT; //Sending data timeout
}
else
{
nRet = SUCCESS; //Sending data ok
}
}
else
{
dwErr = (uint)Marshal.GetLastWin32Error();
if (dwErr == CanDriver.ERROR_IO_PENDING)
{
if (CanDriver.GetOverlappedResult(hDevice, this.txOvr.memPtr, out 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);
}
/*****************************************************************************
*
* 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
*
*****************************************************************************/
private int acWaitEvent(Can.CanDriver.canmsg_t[] msgRead, uint nReadCount, ref uint pulNumberofRead, ref uint ErrorCode)
{
int nRet = OPERATION_ERROR;
ErrorCode = 0;
pulNumberofRead = 0;
if (CanDriver.WaitCommEvent(hDevice, this.events.evPtr, this.events.olPtr) == true)
{
EventCode = (uint)Marshal.ReadInt32(this.events.evPtr, 0);
if ((EventCode & CanDriver.EV_RXCHAR) != 0)
{
nRet = acCanRead(msgRead, nReadCount, ref pulNumberofRead);
}
if ((EventCode & CanDriver.EV_ERR) != 0)
{
nRet = OPERATION_ERROR;
acClearCommError(ref ErrorCode);
}
}
else
{
int err = Marshal.GetLastWin32Error();
if (CanDriver.ERROR_IO_PENDING == err)
{
if (CanDriver.GetOverlappedResult(hDevice, this.eventOvr.memPtr, out pulNumberofRead, true))
{
EventCode = (uint)Marshal.ReadInt32(this.events.evPtr, 0);
if ((EventCode & CanDriver.EV_RXCHAR) != 0)
{
nRet = acCanRead(msgRead, nReadCount, ref pulNumberofRead);
}
if ((EventCode & CanDriver.EV_ERR) != 0)
{
nRet = OPERATION_ERROR;
acClearCommError(ref ErrorCode);
}
}
else
{
nRet = OPERATION_ERROR;
}
}
else
{
nRet = OPERATION_ERROR;
}
}
return(nRet);
}
/*****************************************************************************
*
* acCanRead
*
* Purpose:
* Read can message.
*
*
* Arguments:
* msgRead - managed buffer for read
* nReadCount - msg number that unmanaged buffer can preserve
* pulNumberofRead - real msgs have read
*
* Returns:
* =0 SUCCESS; or <0 failure
*
*****************************************************************************/
private int acCanRead(Can.CanDriver.canmsg_t[] msgRead, uint nReadCount, ref uint pulNumberofRead)
{
bool flag;
int nRet;
uint i;
if (nReadCount > MaxReadMsgNumber)
{
nReadCount = MaxReadMsgNumber;
}
pulNumberofRead = 0;
flag = CanDriver.ReadFile(hDevice, orgReadBuf, nReadCount, out pulNumberofRead, this.rxOvr.memPtr);
if (flag)
{
if (pulNumberofRead == 0)
{
nRet = TIME_OUT;
}
else
{
for (i = 0; i < pulNumberofRead; i++)
{
if (OS_TYPE == 8)
{
msgRead[i] = (CanDriver.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt64() + CanDriver.CAN_MSG_LENGTH * i), typeof(CanDriver.canmsg_t)));
}
else
{
msgRead[i] = (CanDriver.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt32() + CanDriver.CAN_MSG_LENGTH * i), typeof(CanDriver.canmsg_t)));
}
}
nRet = SUCCESS;
}
}
else
{
if (CanDriver.GetOverlappedResult(hDevice, this.rxOvr.memPtr, out pulNumberofRead, true))
{
if (pulNumberofRead == 0)
{
nRet = TIME_OUT; //Package receiving timeout
}
else
{
for (i = 0; i < pulNumberofRead; i++)
{
if (OS_TYPE == 8)
{
msgRead[i] = (CanDriver.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt64() + CanDriver.CAN_MSG_LENGTH * i), typeof(CanDriver.canmsg_t)));
}
else
{
msgRead[i] = (CanDriver.canmsg_t)(Marshal.PtrToStructure(new IntPtr(orgReadBuf.ToInt32() + CanDriver.CAN_MSG_LENGTH * i), typeof(CanDriver.canmsg_t)));
}
}
nRet = SUCCESS;
}
}
else
{
nRet = OPERATION_ERROR; //Package receiving error
}
}
return(nRet);
}