param: enable reseting specific parameters from shell

Renaming previous "param reset" to "param reset_all".

.ci/Jenkinsfile-hardware

@@ -993,7 +993,7 @@ void cleanupFTDI() {
 
   // wipe parameters
   sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-FTDI_*` --cmd "mtd erase"'
-  sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-FTDI_*` --cmd "param reset"'
+  sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-FTDI_*` --cmd "param reset_all"'
 
   // disable buzzer and cleanup storage
   sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-FTDI_*` --cmd "param set CBRK_BUZZER 782097"'
@@ -1020,7 +1020,7 @@ void cleanupSEGGER() {
 
   // wipe parameters
   sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-SEGGER_*` --cmd "mtd erase"'
-  sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-SEGGER_*` --cmd "param reset"'
+  sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-SEGGER_*` --cmd "param reset_all"'
 
   // disable buzzer and cleanup storage
   sh './Tools/HIL/run_nsh_cmd.py --device `find /dev/serial -name *usb-SEGGER_*` --cmd "param set CBRK_BUZZER 782097"'

ROMFS/cannode/init.d/rcS

@@ -51,7 +51,7 @@ fi
 param select $PARAM_FILE
 if ! param load
 then
-	param reset
+	param reset_all
 fi
 
 #

ROMFS/px4fmu_common/init.d/rcS

@@ -169,7 +169,7 @@ else
 	param select $PARAM_FILE
 	if ! param load
 	then
-		param reset
+		param reset_all
 	fi
 
 	#

src/lib/parameters/param.h

@@ -278,6 +278,16 @@ __EXPORT void		param_reset_all(void);
  */
 __EXPORT void		param_reset_excludes(const char *excludes[], int num_excludes);
 
+/**
+ * Reset only specific parameters to their default values.
+ *
+ * This function also releases the storage used by struct parameters.
+ *
+ * @param resets Array of param names to reset. Use a wildcard at the end to reset parameters with a certain prefix.
+ * @param num_resets The number of passed reset conditions in the resets array.
+ */
+__EXPORT void		param_reset_specific(const char *resets[], int num_resets);
+
 /**
  * Export changed parameters to a file.
  * Note: this method requires a large amount of stack size!

src/lib/parameters/parameters.cpp

@@ -881,8 +881,33 @@ param_reset_excludes(const char *excludes[], int num_excludes)
 			param_reset(param);
 		}
 	}
+}
 
-	_param_notify_changes();
+void
+param_reset_specific(const char *resets[], int num_resets)
+{
+	param_t	param;
+
+	for (param = 0; handle_in_range(param); param++) {
+		const char *name = param_name(param);
+		bool reset = false;
+
+		for (int index = 0; index < num_resets; index++) {
+			int len = strlen(resets[index]);
+
+			if ((resets[index][len - 1] == '*'
+			     && strncmp(name, resets[index], len - 1) == 0)
+			    || strcmp(name, resets[index]) == 0) {
+
+				reset = true;
+				break;
+			}
+		}
+
+		if (reset) {
+			param_reset(param);
+		}
+	}
 }
 
 int

src/systemcmds/param/param.cpp

@@ -92,7 +92,8 @@ static void	do_show_print(void *arg, param_t param);
 static int	do_set(const char *name, const char *val, bool fail_on_not_found);
 static int	do_compare(const char *name, char *vals[], unsigned comparisons, enum COMPARE_OPERATOR cmd_op,
 			   enum COMPARE_ERROR_LEVEL err_level);
-static int 	do_reset(const char *excludes[], int num_excludes);
+static int 	do_reset_all(const char *excludes[], int num_excludes);
+static int 	do_reset_specific(const char *resets[], int num_resets);
 static int 	do_touch(const char *params[], int num_params);
 static int	do_reset_nostart(const char *excludes[], int num_excludes);
 static int	do_find(const char *name);
@@ -161,7 +162,9 @@ $ reboot
 	PRINT_MODULE_USAGE_COMMAND_DESCR("touch", "Mark a parameter as used");
 	PRINT_MODULE_USAGE_ARG("<param_name1> [<param_name2>]", "Parameter name (one or more)", true);
 
-	PRINT_MODULE_USAGE_COMMAND_DESCR("reset", "Reset params to default");
+	PRINT_MODULE_USAGE_COMMAND_DESCR("reset", "Reset only specified params to default");
+	PRINT_MODULE_USAGE_ARG("<param1> [<param2>]", "Parameter names to reset (wildcard at end allowed)", true);
+	PRINT_MODULE_USAGE_COMMAND_DESCR("reset_all", "Reset all params to default");
 	PRINT_MODULE_USAGE_ARG("<exclude1> [<exclude2>]", "Do not reset matching params (wildcard at end allowed)", true);
 	PRINT_MODULE_USAGE_COMMAND_DESCR("reset_nostart",
 					 "Reset params to default, but keep SYS_AUTOSTART and SYS_AUTOCONFIG");
@@ -302,10 +305,20 @@ param_main(int argc, char *argv[])
 
 		if (!strcmp(argv[1], "reset")) {
 			if (argc >= 3) {
-				return do_reset((const char **) &argv[2], argc - 2);
+				return do_reset_specific((const char **) &argv[2], argc - 2);
 
 			} else {
-				return do_reset(nullptr, 0);
+				PX4_ERR("not enough arguments (use 'param reset_all' to reset all).");
+				return 1;
+			}
+		}
+
+		if (!strcmp(argv[1], "reset_all")) {
+			if (argc >= 3) {
+				return do_reset_all((const char **) &argv[2], argc - 2);
+
+			} else {
+				return do_reset_all(nullptr, 0);
 			}
 		}
 
@@ -794,7 +807,7 @@ do_compare(const char *name, char *vals[], unsigned comparisons, enum COMPARE_OP
 }
 
 static int
-do_reset(const char *excludes[], int num_excludes)
+do_reset_all(const char *excludes[], int num_excludes)
 {
 	if (num_excludes > 0) {
 		param_reset_excludes(excludes, num_excludes);
@@ -806,6 +819,13 @@ do_reset(const char *excludes[], int num_excludes)
 	return 0;
 }
 
+static int
+do_reset_specific(const char *resets[], int num_resets)
+{
+	param_reset_specific(resets, num_resets);
+	return 0;
+}
+
 static int
 do_touch(const char *params[], int num_params)
 {