>
> Please post the full output of ls -l /dev/uio*
>
> Do you (your user ID) have write access to that files?
>

debian@beaglebone:~/analog$ ls -l /dev/uio*
crw-rw---- 1 root users 240, 0 Nov  3  2016 /dev/uio0
crw-rw---- 1 root users 240, 1 Nov  3  2016 /dev/uio1
crw-rw---- 1 root users 240, 2 Nov  3  2016 /dev/uio2
crw-rw---- 1 root users 240, 3 Nov  3  2016 /dev/uio3
crw-rw---- 1 root users 240, 4 Nov  3  2016 /dev/uio4
-rw-r--r-- 1 root root       0 Mar 29 08:30 /dev/uio5
crw-rw---- 1 root users 240, 6 Nov  3  2016 /dev/uio6
crw-rw---- 1 root users 240, 7 Nov  3  2016 /dev/uio7

When I add write access to /dev/uio5, and run my code (or example 1), I get 
a Bus error.

/dev/uio5 is listed in white, which means the system doesn't recognize it 
as a device, correct? 

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