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Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 10:16
by abhishek1808
Hello
We are using a miniPCIe (2 Channels).
The Card is on Bus 6 (Firmware 1.3.0)
The Development package is PCAN Basic API and development platform is .Net (C#, 4.2)
Somehow, I am not able to read a particular ID. Below is my code
Code: Select all
do
{
//TPCANMsg msg = new TPCANMsg();
statusCAN = PCANBasic.Read(channel, out msg, out _timeStamp);
if (statusCAN == TPCANStatus.PCAN_ERROR_OK)
{
if (msg.ID == 0x18FF0221)
{
temp = (TwoBitStates)((msg.DATA[5] & 0x30) >> 4);// 0x30 = 0011 0000
}
else if (msg.ID == 0x18FF0421)
{
temp = msg.DATA[5];
}
else if (msg.ID == 0x18FF0921)
{
temp = msg.DATA[5];
}
else
{ /* ignore other messages*/ }
}
else
{
LogWriter.LogWrite("Component CAN Error in Reading: " + statusCAN.ToString() + _timeStamp.ToString());
}
} while (!Convert.ToBoolean(statusCAN & TPCANStatus.PCAN_ERROR_QRCVEMPTY));
On PCAN View I can see all the 3 messages, but somehow msg.ID = 0x18FF0921 is never read. I put a breakpoint there.
But it never Enters the Else if statement.
All message are on same bus. Is the Code not okay?
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 12:18
by PEAK-Support
Looks OK - but i would do it this way...
Code: Select all
do
{
statusCAN = PCANBasic.Read(channel, out msg, out _timeStamp);
if (statusCAN == TPCANStatus.PCAN_ERROR_OK)
{
switch (msg.ID)
{
case 0x18FF0221:
temp = (TwoBitStates)((msg.DATA[5] & 0x30) >> 4);// 0x30 = 0011 0000
break;
case 0x18FF0421:
temp = msg.DATA[5];
break;
case 0x18FF0921:
temp = msg.DATA[5];
break;
default:
/* ignore other messages*/
break;
}
}
else
{
LogWriter.LogWrite("Component CAN Error in Reading: " + statusCAN.ToString() + timeStamp.ToString());
}
} while (!Convert.ToBoolean(statusCAN & TPCANStatus.PCAN_ERROR_QRCVEMPTY));
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 12:30
by abhishek1808
Dear U.Wilhelm
I started with SWITCH but when i saw the example code from PEAK, I started using IF, ELSE thinking that maybe (which is a big maybe) I need to use IF, Else.
The Curious case is that I have a Dual Channel CAN Card from PEAK. The Other CAN channel works perfectly.
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 12:50
by PEAK-Support
Did you set any Filter? I do not see any reason why a card should not transmit exact this ID ...
Have you DEBUG the code, and set a Breakpoint in the switch when the case is called?
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 13:04
by abhishek1808
Hi
I have not set any filter!
I use breakpoints off course.
Will filter help? and why shall it?
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 13:16
by PEAK-Support
Filter will not fix your results. Please start your Application and connect to the Channel that loos this ID.
Now start PCAN-View and select the in use CAN Channel (you will see a info "hardware in use" - ignore it )
Now the PCAN-View works side by side to your application. All your Application send will be shown in PCAN-View. And all IDs you send with PCAN-View will also been transmitted to your Applications queue. Now send the ID from PCAN-View and see if it will be received.
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 14:08
by abhishek1808
I can see the message on PCAN View!
I have attached a Screen shot and using SWITCH CASE! Still the same issue.
- Screen Shot of PCAN, whree the Message can be seen.
- xdfdsfsdf.PNG (13.78 KiB) Viewed 10945 times
The actual code is attached here :
a.txt- Code
- (3.53 KiB) Downloaded 622 times
I hope I have provided enough Information.
Re: Communication (Read Messages) discrepancy
Posted: Tue 1. Nov 2016, 15:26
by PEAK-Support
1. I do not see if you connected the PCAN-View to the SAME CAN Hardware. If yes send the Frame one time from the PCAN-View to see if this will be received by your application. Thats what i say in my last post.
You say that PCAN-View see it - so the CAN PC Hardware read it - looks like no Hardware problem.
2. Download our sample, start it and see if the ID will be shown in the receive window.
http://www.peak-system.com/produktcd/De ... xample.exe
3. Please also send me the Initialize code to my by e-mail (
support@peak-system.com)