Guppy PRO Technical Manual
V4.1.2
78
Pulse-width modulation
The 1 input and 3 outputs are independent. Each output has pulse-width
modulation (PWM) capabilities, which can be used (with additional external
electronics) for motorized speed control or autofocus control.
Period (in µs) and pulse width (in µs) are adjustable via the following registers
(see also examples in
Note
The signals can be inverted.
Caution
Firing a new trigger while IntEna is still active can result in
missing image.
Note
•
Note that trigger delay in fact delays the image capture
whereas the IntEna_Delay only delays the leading edge
of the IntEna output signal but does not delay the image
capture.
•
As mentioned before, it is possible to set the outputs by
software. Doing so, the achievable maximum frequency
is strongly dependent on individual software capabilities.
As a rule of thumb, the camera itself will limit the toggle
frequency to not more than 700 Hz.
Register
Name
Field
Bit
Description
0xF1000800 IO_OUTP_PWM1 Presence_Inq
[0]
Indicates presence of this feature
(read only)
---
[1]
Reserved
---
[2 to 3]
Reserved
MinPeriod
[4 to 19] Minimum PWM period in µs
(read only)
---
[20 to 27] Reserved
---
[28 to 31] Reserved
0xF1000804
PulseWidth
[0 to 15] PWM pulse width in µs
Period
[16 to 31] PWM period in µs
Table 31: PWM configuration registers
