PCAN-USB latency above 1ms-is it better to use PCAN-PCI?

[fsolodovnik]

Dear PEAK support

We are developing the CAN bootloader under Windows and we need to transfer several Mb of data fast.
We use request-response protocol: Windows host sends CAN frame and ECU responds with ACK frame
I have found one related topic viewtopic.php?f=181&t=7664&p=19896&hilit=latency#p19896
I used slightly modified PCANBasicExample for test: two PCANBasicExample apps wait for received CAN frame and send own CAN frame when some foreign frame comes
The pseudocode of CANReadThreadFunc looks like

Code: Select all

                if (m_ReceiveEvent.WaitOne(50))
                {
                    do
                    {
                        result = PCANBasic.Read(m_PcanHandle, out CANMsg, out CANTimeStamp);
                        if (result == TPCANStatus.PCAN_ERROR_OK) WriteFrame(1);
                        if (result == TPCANStatus.PCAN_ERROR_ILLOPERATION) break;                       
                    } while (btnRelease.Enabled && (!Convert.ToBoolean(stsResult & TPCANStatus.PCAN_ERROR_QRCVEMPTY)));
                }

I see that interframe delay is about 1-2 ms . Is it related to USB limitations? Is there any interrupt driven CAN adapter?
What can be done to reduce interframe delay?
- Use Linux?
-Use PCI adapter?

Thank You in advance
Best regards, Fedor Solodovnik

[M.Heidemann]

Hello,

If timing is this criticial a PCIe based PCAN/Interface would be our recommendation,
the USB-stack will add latency.

BR

Marvin