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Appendix B: GPIO Control
Counter Reset Activation
Same as above, but for the clear event. The clear event input of the counter does not have
a predefined label on the GPIO LUT.
Counter Reset Source
Indicates which label from the GPIO LUT that will be associated with the clear event input of
the counter. Make sure you select an input label that is not being used for its default
behavior. The possible values are: Q3, Q7, Q8, Q9, Q10, Q11, Q16, and Q17.
Current Counter Value
Displays the current counter value
Input Debouncing
The Debouncers tab is used to configure the debouncers of the camera. The debouncers are
associated with the first and second PHYSICAL inputs of the software, usually Input 1 and
Input 2.
The debouncers make sure that their corresponding inputs filter out bouncing effects.
Bouncing is when there are a few very short pulses when the input signal transitions from
low to high. Without debouncing, the controller may see these small pulses as real signals.
The debouncers make sure that the signal is truly high for the specified amount of time
before it is declared as high. The same applies to the falling edge.
Input 0 Value
Indicates the debouncing value for input 0. Each unit is equal to 16 clock cycles (30ns
each), or 480ns.
Input 1 Value
Indicates the debouncing value for input 1. Each unit is equal to 16 clock cycles (30ns
each), or 480ns.
Input 2 Value
Indicates the debouncing value for input 2. Each unit is equal to 16 clock cycles (30ns
each), or 480ns.
Input 3 Value
Indicates the debouncing value for input 3. Each unit is equal to 16 clock cycles (30ns
each), or 480ns.
