Add tune control docs as options

src/systemcmds/tune_control/tune_control.cpp

@@ -44,6 +44,8 @@
 #include <string.h>
 #include <unistd.h>
 
+#include <px4_module.h>
+
 #include <lib/tunes/tunes.h>
 #include <uORB/topics/tune_control.h>
 
@@ -62,22 +64,40 @@ extern "C" {
 static void
 usage()
 {
-	PX4_INFO(
-		"External tune control for testing.\n\n"
-		"For information about tune format/system tunes see:\n"
-		"https://github.com/PX4/Firmware/blob/master/src/lib/tunes/tune_definition.desc.\n\n"
-		"Usage:\n"
-
-		"tune_control play [-t <default tunes>] [-f <frequency>] [-d <duration>] [-s <strength>] [-m < melody>]\n"
-		"\n"
-		"\t-t <system tunes>\tPlay a predefined system tune (default=1)\n"
-		"\t-f <frequency>\t\tFrequency from 0-20kHz\n"
-		"\t-d <duration>\t\tDuration of the tone in us\n"
-		"\t-s <strength>\t\tStrength of the tone between 0-100\n"
-		"\t-m <melody>\t\tMelody in a string form ex: \"MFT200e8a8a\"\n"
-		"\n"
-		"tune_control stop \t\tStops playback, useful for repeated tunes\n"
-	);
+
+	PRINT_MODULE_DESCRIPTION(
+		R"DESCR_STR(
+### Description
+
+Command-line tool to control & test the (external) tunes.
+
+Tunes are used to provide audible notification and warnings (e.g. when the system arms, gets position lock, etc.).
+The tool requires that a driver is running that can handle the tune_control uorb topic.
+
+Information about the tune format and predefined system tunes can be found here:
+https://github.com/PX4/Firmware/blob/master/src/lib/tunes/tune_definition.desc
+
+### Examples
+
+Play system tune #2:
+
+    tune_control play -t 2
+
+
+)DESCR_STR");
+
+
+	PRINT_MODULE_USAGE_NAME("tune_control", "system");
+	PRINT_MODULE_USAGE_COMMAND_DESCR("play","Play system tune, tone, or melody");
+        PRINT_MODULE_USAGE_PARAM_INT('t', 1, 1, 21, "Play predefined system tune", true);
+        PRINT_MODULE_USAGE_PARAM_INT('f', 0, 0, 22, "Frequency of tone in Hz (0-22kHz)", true);
+	PRINT_MODULE_USAGE_PARAM_INT('d', 1, 1, 21, "Duration of tone in us", true);
+	PRINT_MODULE_USAGE_PARAM_INT('s', 40, 0, 100, "Strength of tone (0-100)", true);
+	PRINT_MODULE_USAGE_PARAM_STRING('m', nullptr, "<string> - e.g. \"MFT200e8a8a\"",
+					 "Melody in string form", true);
+	PRINT_MODULE_USAGE_COMMAND_DESCR("libtest","Test library");
+	PRINT_MODULE_USAGE_COMMAND_DESCR("stop","Stop playback (use for repeated tunes)");
+
 }
 
 static void publish_tune_control(tune_control_s &tune_control)