Allied Guppy, Техническое руководство, Страница: 117 / 238

Camera interfaces
GUPPY Technical Manual V4.0.1
117
Board level cameras: pulse-width modulation
The 4 inputs and 4 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 regis-
ters (see also examples in Chapter
PWM: Examples in practice on page 118):
To enable the PWM feature select output mode 0x09. Control the signal state
via the
PulseWidth and Period fields (all times in microseconds (µs)).
Register Name Field Bit Description
0xF1000800 IO_OUTP_PWM1 Presence_Inq [0] Indicates presence of this
feature (read only)
--- [1] Reserved
--- [2..3] Reserved
MinPeriod [4..19] Minimum PWM period in µs
(read only)
--- [20..27] Reserved
--- [28..31] Reserved
0xF1000804 PulseWidth [0..15] PWM pulse width in µs
Period [16..31] PWM period in µs
0xF1000808 IO_OUTP_PWM2 Same as
IO_OUTP_PWM1
0xF100080C IO_OUTP_PWM3 Same as
IO_OUTP_PWM1
0xF1000810 IO_OUTP_PWM4 Same as
IO_OUTP_PWM1
Table 49: PWM configuration registers
Figure 54: PulseWidth and Period definition
PulseWidth
Period