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I am using NI USB-6259 device. I have created an access library for this device using native C. The problem appears when I want to create a task with two digital channels: e.g. line0:3 and line4:7. This is continously working task so I register an everyNSamplesEvent callback for each channel. This callback returns data for both channels. At least it should. The behaviour of this callback is quite strange because the change state on lines 4:7 returns proper data (for both channels) but changing state of lines 0:3 returns always 0 for this channel. So if I want to see the state of first channel I have to force the digital state change on the second one. What is the problem and how can I fix it?
