# CMUBox \`Timestamp Trouble'

**URL:** <https://psychtoolbox.discourse.group/t/cmubox-timestamp-trouble-39/832>\
**Category:** Uncategorized\
**Created:** [August 8, 2013, 5:11pm UTC](https://psychtoolbox.discourse.group/t/cmubox-timestamp-trouble-39/832 "2013-08-08T17:11:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [August 8, 2013, 5:11pm UTC](https://psychtoolbox.discourse.group/t/cmubox-timestamp-trouble-39/832/1 "2013-08-08T17:11:08Z")

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Hi there,  
  

I am using the CMUBox() function to get input from a PST serial response box. We're running Ubuntu on the machine, and using Octave to run Psychtoolbox. I keep getting the Timestamp trouble!! error. My code is below:  
  
octave:1\> bh=CMUBox('Open','pst','/dev/ttyS0')  
CMUBox: Using PST serial response button box!  
bh = 1  
octave:2\> evt=CMUBox('GetEvent',bh,1)  
CMUBox: GetEvent: Timestamp trouble!! Delta 23624.439001 msecs, ScanInterval 0.002000 msecs.  
evt =  
  
 scalar structure containing the fields:  
  
 time = 1.3760e+09  
 streamTime = 1.3760e+09  
 state = 1  
 trouble = 1  
 deltaScan = 2.0000e-06  
  
octave:3\> CMUBox('Status',bh)  
ans =  
  
 scalar structure containing the fields:  
  
 useBitwhacker = 0  
 Streaming = 1  
 type = 3  
 ftdiusbserialtype = 0  
 norelease = 0  
 portName = /dev/ttyS0  
 port = 0  
 dt = 0.0013176  
 oldState = 1  
 baseTime = 1.3760e+09  
 olderr =   
 oldTime = 1.3760e+09  
 tTrouble = 1  
 deltaScan = 2.0000e-06  
 skipped = 0  
  

Things I have checked/tried:   
- the PST box is definitely set to 800 cps, and 19200 baud.  

- running as administrator doesn't help.  

- setting Priority to 1 with Priority() doesn't help  

( here's my script for that, in case I didn't do it right:  
  
octave:4\> oldPriority=Priority(1)  
PTB-INFO: Display ':0' : X-Screen 0 : Assigning primary output as 0 with RandR-CRTC 0 and GPU-CRTC 0.  
oldPriority = 0  
  
)  
  

Any advice would be greatly appreciated!  

~Claire