Pike Technical Manual
V5.2.0
121
Camera interfaces
Set PWM with 1kHz at 30% pulse width.
Example 2:
Set PWM with 250 Hz at 12% pulse width.
Pixel data
Pixel data are transmitted as isochronous data packets in accordance with the
1394 interface described in IIDC V1.31. The first packet of a frame is identified
by the
1
in the
sync bit
(sy) of the packet header.
0-7
8-15
16-23
24-31
data_length
tg
channel
tCode
sy
header_CRC
Video data payload
data_CRC
Table 33: Isochronous data block packet format. Source: IIDC V1.31
sync bit
Formula 2: PWM example 1
Formula 3: PWM example 2
RegPeriod
1
frequency
6
–
10 s
--------------------------------------
1
1kHz
6
–
10 s
---------------------------
1000
=
=
=
RegPulseWidth
RegPeriod
30%
1000
30%
300
=
=
=
RegPeriod
1
frequency
6
–
10 s
--------------------------------------
1
250Hz
6
–
10 s
------------------------------
4000
=
=
=
RegPulseWidth
RegPeriod
12%
4000
12%
480
=
=
=