PEAK-System Forum

I am using PCAN-Basic under Windows.

The problem was related to allocation within Matlab and not from PEAK. Now the code works.

But still the documentation of "CAN_InitializeFD" mislead me to false expectation that a string pointer is used longer than during function call itself and immediate ...

I have big troubles with this function. There is undocumented behavior who deallocates the string passed.

If I do this:
TPCANStatus stsResult = CAN_InitializeFD(Channel, BitrateFD);
free(BitrateFD);

It causes program to crash.

When I toss away a pointer, it could cause leak. Who releases the ...

Excuse me, another header collided with DWORD. Now seems everything OK.
This thread could be erased not to confuse others.

It seems that there is something more weird:
printf("__u32 %ld __u16 %ld __u8 %ld\n", sizeof(__u32), sizeof(__u16), sizeof(__u8));

printf("sizeof(unsigned char)=%lu\n", sizeof(unsigned char));
printf("sizeof(unsigned short)=%lu\n", sizeof(unsigned short));
printf("sizeof(unsigned int)=%lu\n ...

The header pcan.c is from 2010.

C standard 2011 define these types:
https://pubs.opengroup.org/onlinepubs/0 ... int.h.html
https://en.cppreference.com/w/cpp/types/integer

I have found a critical issue.

typedef __signed__ int __s32;
typedef unsigned int __u32;
this __u32 has size 64 bit and not 32 bit.

pcan.h forces:
#else
#define DWORD __u32
#define WORD __u16
#define BYTE __u8
#endif
DWORD to 64 bit int and it corrupts my code. Is there any way how to get out ...

This "unwanted" message could be caused by service message (they start without any request), but even when so, the service mesasage does not signalise select command, so the receiver dependent on "select" hangs.

/** Internal working thread that listens for new messages. */
void *CanPeak ...

After disconnecting and connecting CAN cable I have read bunch of phantom CAN messages, see attached file for details. First number is time mark in [ms].

8182873 Message P-CAN received Id=1, Len=4 0 0 0 0
8182873 Message P-CAN received Id=2, Len=4 0 0 0 4
8182873 Message P-CAN received Id=3, Len=4 ...

Thank you very much for hint. It seems to work as expected.

There is only one flaw inside your demo (fix included in this fragment):
struct timeval timeout;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
int err = select(fd+1, &fds, NULL, NULL, &timeout);
if(err!=0) // Timeout ocurred -> err==0 ...

I have packed your library to .deb package.

I cannot post to this forum .deb extension file . I can send it, if somebody has interest. It is much more convenient to do regular installation process than "make install".