From 41a9402175c3654032aeffb30e43e32eeb9e34a9 Mon Sep 17 00:00:00 2001
From: "Dr.-Ing. Amilcar Do Carmo Lucas" <amilcar.lucas@iav.de>
Date: Tue, 2 May 2017 15:42:29 +0200
Subject: [PATCH] AP_Camera: Use SI units conventions in parameter units

Follow the rules from:
http://physics.nist.gov/cuu/Units/units.html
http://physics.nist.gov/cuu/Units/outside.html
and
http://physics.nist.gov/cuu/Units/checklist.html
one further constrain is that only printable (7bit) ASCII characters are allowed
---
 libraries/AP_Camera/AP_Camera.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libraries/AP_Camera/AP_Camera.cpp b/libraries/AP_Camera/AP_Camera.cpp
index f18ae67fde..5cc418acc3 100644
--- a/libraries/AP_Camera/AP_Camera.cpp
+++ b/libraries/AP_Camera/AP_Camera.cpp
@@ -26,7 +26,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @Param: DURATION
     // @DisplayName: Duration that shutter is held open
     // @Description: How long the shutter will be held open in 10ths of a second (i.e. enter 10 for 1second, 50 for 5seconds)
-    // @Units: deciseconds
+    // @Units: ds
     // @Range: 0 50
     // @User: Standard
     AP_GROUPINFO("DURATION",    1, AP_Camera, _trigger_duration, AP_CAMERA_TRIGGER_DEFAULT_DURATION),
@@ -34,7 +34,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @Param: SERVO_ON
     // @DisplayName: Servo ON PWM value
     // @Description: PWM value to move servo to when shutter is activated
-    // @Units: pwm
+    // @Units: PWM
     // @Range: 1000 2000
     // @User: Standard
     AP_GROUPINFO("SERVO_ON",    2, AP_Camera, _servo_on_pwm, AP_CAMERA_SERVO_ON_PWM),
@@ -42,7 +42,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @Param: SERVO_OFF
     // @DisplayName: Servo OFF PWM value
     // @Description: PWM value to move servo to when shutter is deactivated
-    // @Units: pwm
+    // @Units: PWM
     // @Range: 1000 2000
     // @User: Standard
     AP_GROUPINFO("SERVO_OFF",   3, AP_Camera, _servo_off_pwm, AP_CAMERA_SERVO_OFF_PWM),
@@ -51,7 +51,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @DisplayName: Camera trigger distance
     // @Description: Distance in meters between camera triggers. If this value is non-zero then the camera will trigger whenever the GPS position changes by this number of meters regardless of what mode the APM is in. Note that this parameter can also be set in an auto mission using the DO_SET_CAM_TRIGG_DIST command, allowing you to enable/disable the triggering of the camera during the flight.
     // @User: Standard
-    // @Units: meters
+    // @Units: m
     // @Range: 0 1000
     AP_GROUPINFO("TRIGG_DIST",  4, AP_Camera, _trigg_dist, 0),
 
@@ -66,7 +66,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @DisplayName: Minimum time between photos
     // @Description: Postpone shooting if previous picture was taken less than preset time(ms) ago.
     // @User: Standard
-    // @Units: milliseconds
+    // @Units: ms
     // @Range: 0 10000
     AP_GROUPINFO("MIN_INTERVAL",  6, AP_Camera, _min_interval, 0),
 
@@ -74,7 +74,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @DisplayName: Maximum photo roll angle.
     // @Description: Postpone shooting if roll is greater than limit. (0=Disable, will shoot regardless of roll).
     // @User: Standard
-    // @Units: Degrees
+    // @Units: deg
     // @Range: 0 180
     AP_GROUPINFO("MAX_ROLL",  7, AP_Camera, _max_roll, 0),