Dalsa QuickCam, User Manual

Page: 46 / 85

QuickCam User's Manual 44
03-032-10187-04 DALSA corp.
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.
Compare value
Indicates the value against which to compare to the current value of the counter.
The counter module uses this value to generate both its "equal to" and "greater
than" outputs.
Current Counter Value
Displays the current counter value
6.8 Input Debouncing
To configure Input Debouncing, click the Advanced… button on the
Exposure/GPIO tab in the Camera Configuration dialog box and open the
Device Features tab.
The Debouncers tab is used to configure the debouncers of the camera. The
debouncers are associated with the first and second PHYSICAL inputs of
QuickCam, 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, QuickCam 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.