Help with raw data file creation

[giganscudo]

Hi!

I tried to install emokit on Ubuntu 12.04 x64 running in Virtual Box using the instructions from the zip file (INSTALL.md). I have been successful in compiling it using cmake, tried to run contact.exe and it gives me contact quality. I tried to run emokitd.exe and it does nothing. With that, I guess it's safe to say that I have successfully built it.

But I don't understand why it is not giving me the raw data file. When I tried to connect Epoc to my machine (with the control panel as my verifier to see whether it's connected or not), there is no /dev/eeg/ folder created, therefore no file created. I tried to use Cygwin for Windows 8 as well, (hoping that there may be a change, lol), but to no avail. There is still no raw data created. When I connect the device to my laptop, it shows the hidraw(x) and using cat, it gives me a kinda-garbage text flowing endlessly until I detach the device. I'm pretty much clueless now. I'm not really experienced with this.

Actually, my question would be, what should I do next after building this? Am I missing something? Any suggestions to solve this will be very much appreciated. :)

[olorin]

It does appear that you've built it correctly (if you can get contact quality readings), but why do the files you built on an Ubuntu VM end with .exe?

Please do the following:

• make sure you are running emokitd as root
• check the syslog at /var/log/syslog for emokitd-related errors
• ensure emokitd is running by running ps aux | grep emokitd
• if the above doesn't reveal anything useful, please install strace on your Ubuntu VM and run emokitd with sudo strace -f emokitd and post the output here.

[giganscudo]

My bad, it's not a .exe file, I got it shuffled up.

• I tried running emokitd as a root, even logging in as a root, but no avail.
• the syslog gave me this output:

Jun 10 23:30:09 roswell kernel: [10778.293970] usb 1-2: new full-speed USB device number 3 using ohci_hcd
Jun 10 23:30:09 roswell kernel: [10778.752122] usb 1-2: New USB device found, idVendor=21a1, idProduct=0001
Jun 10 23:30:09 roswell kernel: [10778.752125] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jun 10 23:30:09 roswell kernel: [10778.752127] usb 1-2: Product: EPOC BCI
Jun 10 23:30:09 roswell kernel: [10778.752129] usb 1-2: Manufacturer: Emotiv Systems Inc.
Jun 10 23:30:09 roswell kernel: [10778.752130] usb 1-2: SerialNumber: SN201404228918GM
Jun 10 23:30:09 roswell kernel: [10778.766638] hid-generic 0003:21A1:0001.0002: hidraw1: USB HID v1.11 Device [Emotiv Systems Inc. EPOC BCI] on usb-0000:00:06.0-2/input0
Jun 10 23:30:09 roswell mtp-probe: checking bus 1, device 3: "/sys/devices/pci0000:00/0000:00:06.0/usb1/1-2"
Jun 10 23:30:09 roswell kernel: [10778.783731] hid-generic 0003:21A1:0001.0003: hidraw2: USB HID v1.11 Device [Emotiv Systems Inc. EPOC BCI] on usb-0000:00:06.0-2/input1
Jun 10 23:30:09 roswell mtp-probe: bus: 1, device: 3 was not an MTP device
Jun 10 23:30:55 roswell emokitd: emokitd running; decrypted EEG data will be written to /dev/emokitd.

The emokitd is created but it's a named pipe. What does this do?

• ps aux | grep emokitd gives me the following output:

root@roswell:/home/roswell/Desktop/emokit-master/bin# ps aux | grep emokitd 
root      2024  0.0  0.0  23172   516 ?        SLl  Jun10   0:00 ./emokitd
root      2823  0.0  0.0  13592   928 pts/8    S+   00:23   0:00 grep --color=auto emokitd
root@roswell:/home/roswell/Desktop/emokit-master/bin# strace -f emokitd
strace: emokitd: command not found
root@roswell:/home/roswell/Desktop/emokit-master/bin# strace -f -p 2024
Process 2024 attached with 2 threads - interrupt to quit
[pid  2025] rt_sigtimedwait(~[RTMIN RT_1], NULL, NULL, 8 <unfinished ...>
[pid  2024] read(5, 

I'm not pretty sure why it stops there.

• I tried strace and it gave me this result:

execve("./emokitd", ["./emokitd"], [/* 38 vars */]) = -1 EACCES (Permission denied)
dup(2)                                  = 3
fcntl(3, F_GETFL)                       = 0x8001 (flags O_WRONLY|O_LARGEFILE)
close(3)                                = 0
write(2, "strace: exec: Permission denied\n", 32strace: exec: Permission denied
) = 32
exit_group(1)                           = ?

Does this mean it just exits? I don't understand the EACCES, I am running as a root, but I still have this error.

I made sure that I have a consistent connection with my device, verified through the control panel. (I'm having issues with my connection, but it's a different issue altogether.)

Upon looking at new issues, I have a similar problem with issue #105 , contact quality also shows 0, 8, 16, 24 (I thought it's normal, because I don't wear the device when I'm troubleshooting this.), and not also generating raw data stream file.

Please help :(

[olorin]

That actually looks like it's working fine to me. Try running cat /dev/emokitd | od with the device on and see what you get.

[giganscudo]

Hi, I don't have an access to my device at the moment, but I'll post the results later.

• I'd like to ask, is the output of ps aux | grep emokitd shown above a normal output? Does it really stop there? Could you explain it further, if you don't mind?
• What does the strace output above mean? Why is there an EACCES even though I am on root account? I hope you don't mind my noobness ._.

[giganscudo]

Hi, I have tried what you have suggested and... It's not showing anything. How come? :(

[BTW, the contact quality shows the right values (~thousand-ish values) after I properly wear the device.]

[giganscudo]

Well, as it turns out, it seems that the udev file is not working for me, so I needed to modify it (it's showing EPOC BCI in the name instead)

Last question though, can I save my raw data as a .csv file? Thanks :)