Camera trigger update (#4998)

* updating the camera driver, correct init and keepAlive function

* removing debug output

src/drivers/camera_trigger/camera_trigger_params.c

@@ -36,25 +36,12 @@
  * Camera trigger parameters
  *
  * @author Mohammed Kabir <mhkabir98@gmail.com>
+ * @author Andreas Bircher <andreas@wingtra.com>
  */
 
 #include <nuttx/config.h>
 #include <systemlib/param/param.h>
 
- /**
- * Camera trigger Interface
- *
- * Selects the trigger interface
- *
- * @value 1 GPIO
- * @value 2 Seagull MAP2 (PWM)
- *
- * @reboot_required true
- *
- * @group Camera trigger
- */
-PARAM_DEFINE_INT32(TRIG_INTERFACE, 2);
-
 /**
 * Camera trigger Interface
 *
@@ -102,7 +89,7 @@ PARAM_DEFINE_INT32(TRIG_POLARITY, 0);
  *
  * @unit ms
  * @min 0.1
- * @max 3
+ * @max 3000
  * @decimal 1
  * @group Camera trigger
  */
@@ -126,7 +113,9 @@ PARAM_DEFINE_INT32(TRIG_MODE, 0);
 /**
  * Camera trigger pin
  *
- * Selects which pin is used, ranges from 1 to 6 (AUX1-AUX6)
+ * Selects which pin is used, ranges from 1 to 6 (AUX1-AUX6 on px4fmu-v2 and the rail
+ * pins on px4fmu-v4). The PWM interface takes two pins per camera, while relay
+ * triggers on every pin individually. Example: Value 34 would trigger on pins 3 and 4.
  *
  * @min 1
  * @max 123456