2009-04-01 22:15:45 need help with PPI
raghu mulagada (UNITED STATES)
Message: 71989
Hello all
I am working to setup a parallel data tranmission using PPI on the blackfin
i am using blackfin 537, my kernel version is linux 2.6.21.19 and user-dist is release 2008R1.5
i modified the kernel to include ppi device as directed in the ppi wiki
i used the following piece of code to call the ppi device and use it :
fd = open("/dev/ppi0", O_RDWR);
if (fd < 0) {
printf("Could not open ppi device : %d \n",errno);
exit(1);
}
else {
printf("fd(%d) = open(/dev/ppi) \n", fd );
}
i can see the ppi in the dev folder of the blackfin when do an 'ls' in the serial port terminal
but when i try to run the appication 'ppitest', it gives me the following error:
could not open ppi device : 2
do any of you guys having experience with using PPI can help me resolve this problem?
thanks
-raghu
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2009-04-01 23:17:41 Re: need help with PPI
Mike Frysinger (UNITED STATES)
Message: 71990
the output already shows you the problem
errno = 2 (ENOENT)
so /dev/ppi does not exist
make sure the device node is in /dev/ and if it isnt, make sure you enabled the driver properly