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Camera module Trigger Mode manual (view source)
Revision as of 20:41, 22 March 2021
, 20:41, 22 March 2021→Hardware Trigger
In this mode,The Trigger IO pin is used as the trigger signal, and the module begins to expose and output the image after receiving the trigger signal.
In this mode,The Trigger IO pin is used as the trigger signal, and the module begins to expose and output the image after receiving the trigger signal.
Pin definition：[[CS-MIPI-SC132 Data Sheet#Interface .26 Pin list|CS-MIPI-SC132 Data Sheet]]
Pin definition：[[CS-MIPI-SC132 Data Sheet#Interface .26 Pin list|CS-MIPI-SC132 Data Sheet]].
If using Xavier/TX2 , multiple cameras could be triggered by one signal.Pin definition：[[ADP-N1 Adapter Board Data Sheet|ADP_N1 Datasheet]].
Triggger edge, trigger delay and trigger debouncer attribute supported.
Triggger edge, trigger delay and trigger debouncer attribute supported.
===Exposure control and maximum frame rate in Trigger mode===
===Exposure control and maximum frame rate in Trigger mode===
====Configuration of exposure and gain in Trigger mode====
====Configuration of exposure and gain in Trigger mode====
In trigger mode, it is recommended that users use manual exposure. Of course, the automatic exposure mode can also be used,
In trigger mode, it is recommended that users use '''direct manual exposure'''. Of course, the automatic exposure mode can also be used,
but because the AE algorithm needs to go through some frames to converge, the exposure effect of the first few frames will not be good.
but because the AE algorithm needs to go through some frames to converge, the exposure effect of the first few frames will not be good.
'''''expmode'''''：exposure mode setting
'''''expmode'''''：exposure mode setting
'''''metime'''''：manual exposure time
'''''dmetime'''''：direct manual exposure time
'''''meagain'''''：manual analog gain
'''''dmeagain'''''：direct manual analog gain
'''''medgain'''''：manual digital gain
'''''dmedgain'''''：direct manual digital gain
You can use the ''expostate'' instruction to read out the current exposure time and gain value in automatic mode as a reference.
You can use the ''expostate'' instruction to read out the current exposure time and gain value in automatic mode as a reference.
'''''T<sub>exp</sub>'''''：exposure time
'''''T<sub>exp</sub>'''''：exposure time
'''''T<sub>trans</sub>'''''：transmission time of one frame
'''''T<sub>trans</sub>'''''：transmission time of one frame（from sensor to isp chip）
Accordingly, if the minimum trigger interval is known, the maximum allowable exposure time is:
Accordingly, if the minimum trigger interval is known, the maximum allowable exposure time is:
''expmode'' is manual : set exposure time via ''metime''.
''expmode'' is manual : set exposure time via ''metime''.
*'''''T<sub>trans</sub>''：transmission time of one frame'''
*'''''T<sub>trans</sub>''：transmission time of one frame(from sensor to isp chip)'''
In trigger mode, the time it takes for an image to be output from sensor, and the next trigger is accepted after the image output is completed.
The transmission time of a frame is related to the current resolution mode.
The transmission time of a frame is related to the current resolution mode.
'''''T<sub>total</sub> = tgdly + T<sub>exp +</sub> T<sub>trans +</sub>T<sub>isp+</sub>T<sub>mipi</sub>'''''
'''''T<sub>total</sub> = tgdly + T<sub>exp +</sub> T<sub>trans +</sub>T<sub>isp+</sub>T<sub>mipi</sub>'''''
'''''T<sub>total</sub>''''' ：the total trigger delay is the time from the trigger signal to the complete image output through the MIPI signal.
'''''T<sub>total</sub>''''' ：the total trigger delay is the time from the trigger signal to the complete image output through the MIPI signal. The following table is obtained by hardware measurement.
'''''tgdly'''''：trigger delay time, the following measurements are configured to 0. ''tgdly'' is valid only for Hardware trigger mode.
'''''tgdly'''''：trigger delay time, the following measurements are configured to 0. ''tgdly'' is valid only for Hardware trigger mode.