PCAN-ISO TP: How reset the hardware interface

[fabio.parodi@technoleader.it]

Hello
I have users reporting strange problems with the PEAK USB CAN interface, when used with a software application, using the Peak PCAN-ISO TP and UDS libraries.
Difficult to reproduce problem, for example, sometimes the application do not communicate.
Normally the problem goes away when the user:

- exits the application
- unplugs the USB cable
- waits a few seconds
- plugs the USB cable
- restarts the application

Just wondering if there is a way to force a hardware reset.
thanks and regards

[M.Heidemann]

Hello Fabio,

Currently this sounds like physical issues with the bus itself, if you ask me.

My recommendation:

Those users should make sure they are using the proper termination (120 Ohm on Bus-ends) and the right Bitrate/Bit-Timing,
they should verify this first before proceeding. If this is a physical issue with the bus correcting it will save your further headaches further down the line.

However, to reset a channel you can use the 'unitialize' function:

PCAN-ISO-TP API – Documentation for API Version 3.x
Page 102
Chapter 3.6 Methods
(...)
Methods Description

Initialize_2016
Initializes a PCANTP channel.

InitializeFD_2016
Initializes a PCANTP channel with CAN-FD support.

Uninitialize_2016
Uninitializes a PCANTP channel.

usage example:

Code: Select all

uds_status result;
// The Plug & Play channel (PCAN-PCI) is initialized
result = UDSApi.Initialize_2013(cantp_handle.PCANTP_HANDLE_PCIBUS2,cantp_baudrate.PCANTP_BAUDRATE_500K);

if (!UDSApi.StatusIsOk_2013(result))
	MessageBox.Show("Initialization failed", "Error");
else
	MessageBox.Show("PCAN-PCI (Ch-2) was initialized", "Success");
// Release channel
result = UDSApi.Uninitialize_2013(cantp_handle.PCANTP_HANDLE_PCIBUS2);
if (!UDSApi.StatusIsOk_2013(result))
	MessageBox.Show("Uninitialization failed", "Error");
else
	MessageBox.Show("PCAN-PCI (Ch-2) was released", "Success");

Link to documentation for PCAN-UDS API:

https://www.peak-system.com/produktcd/P ... an_eng.pdf

Please let me know if the issue could be resolved!

Best Regards

Marvin

[M.Heidemann]

In addition to my previous answer, because i forgot:

You can alternatively set PUDS_PARAMETER_RESET_HARD via UDS_SetValue_2013(), to perform a hard reset (and keep settings and mappings):

PUDS_PARAMETER_RESET_HARD
Access: Can be set.
Description: Resets the CAN controller and clears internal reception and transmission queues. This
parameter provides a way to uninitialize then initialize the CAN channel without losing any configured
mappings and PUDS/PCANTP related settings.

Possible values: 1.

Default value: NA.

PCAN-Device: All PCAN devices (excluding PCANTP_HANDLE_NONEBUS channel).

Best Regards

Marvin

[fabio.parodi@technoleader.it]

Thanks I will try to apply both suggestions - unninitialize and reset. I will let you know when I receive feedback from the field.