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Camera interfaces

STINGRAY Technical Manual V2.2.0

Pulse-width modulation (Stingray housing and

Stingray board level models)

The 2 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 91):

To enable the PWM feature select output mode 0x09. Control the signal state

via the PulseWidth and Period fields (all times in microseconds (µs)).

Note

• Note that trigger delay in fact delays the image cap-

ture 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 fre-

quency 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.

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 29: PWM configuration registers

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 308 309

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