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Camera Triggering: Trigger pins use direct pin access #557

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Aug 19, 2019
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Camera Triggering: Trigger pins use direct pin access #557

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Camera Triggering: Trigger pins use direct pin access
hamishwillee Aug 16, 2019
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Typo
hamishwillee Aug 16, 2019
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8 changes: 7 additions & 1 deletion en/peripherals/camera.md
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Expand Up @@ -20,8 +20,14 @@ Mode | Description

## Trigger Hardware Configuration

You can choose which AUX pins to use for triggering using the [TRIG_PINS](../advanced_config/parameter_reference.md#TRIG_PINS) parameter. The default is 56, which means that trigger is enabled on AUX 5 and AUX 6.
You can choose which pins to use for triggering using the [TRIG_PINS](../advanced_config/parameter_reference.md#TRIG_PINS) parameter.
The default is 56, which means that trigger is enabled on *FMU* pins 5 and 6.

> **Note** On a Pixhawk flight controller that has both FMU and I/O boards these FMU pins map to `AUX5` and `AUX6` (e.g. Pixhawk 4, CUAV v5+).
On a controller that only has an FMU, the pins map to `MAIN5` and `MAIN6` (e.g. Pixhawk 4 mini, CUAV v5 nano).
At time of writing triggering only works on FMU pins - you can't trigger a camera using pins on the I/O board.

<span></span>
> **Warning** With `TRIG_PINS` set to its **default** value of 56, you can use the AUX pins 1, 2, 3 and 4 as actuator outputs (for servos/ESCs). Due to the way the hardware timers are handled (1234 and 56 are 2 different groups handled by 2 timers), this is the ONLY combination which allows the simultaneous usage of camera trigger and FMU actuator outputs. **DO NOT CHANGE THE DEFAULT VALUE OF `TRIG_PINS` IF YOU NEED ACTUATOR OUTPUTS.**

## Trigger Interface Backends
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