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examples: add adjtime example application

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This application demonstrates the usage of adjtime() interface.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc 2023-04-29 12:10:45 +02:00 committed by Xiang Xiao
parent f95d60366a
commit f270ef644e
4 changed files with 256 additions and 0 deletions
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32
examples/adjtime/Kconfig Normal file
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#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
config EXAMPLES_ADJTIME
tristate "Ajdtime function example"
default n
depends on CLOCK_ADJTIME
---help---
Enable the adjtime example. This application demonstrates the usage
of adjtime() interface used to synchronize system clock time if
its value varies from real time (usually get by external RTC).
if EXAMPLES_ADJTIME
config EXAMPLES_ADJTIME_PROGNAME
string "Program name"
default "adjtime"
---help---
This is the name of the program that will be used when the NSH ELF
program is installed.
config EXAMPLES_ADJTIME_PRIORITY
int "Adjtime task priority"
default 100
config EXAMPLES_ADJTIME_STACKSIZE
int "Adjtime stack size"
default DEFAULT_TASK_STACKSIZE
endif

23
examples/adjtime/Make.defs Normal file
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############################################################################
# apps/examples/adjtime/Make.defs
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership. The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
############################################################################
ifneq ($(CONFIG_EXAMPLES_ADJTIME),)
CONFIGURED_APPS += $(APPDIR)/examples/adjtime
endif

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examples/adjtime/Makefile Normal file
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############################################################################
# apps/examples/adjtime/Make.defs
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership. The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
############################################################################
include $(APPDIR)/Make.defs
# Adjtime built-in application info
PROGNAME = $(CONFIG_EXAMPLES_ADJTIME_PROGNAME)
PRIORITY = $(CONFIG_EXAMPLES_ADJTIME_PRIORITY)
STACKSIZE = $(CONFIG_EXAMPLES_ADJTIME_STACKSIZE)
MODULE = $(CONFIG_EXAMPLES_ADJTIME)
# Adjtime Example
MAINSRC = adjtime_main.c
include $(APPDIR)/Application.mk

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examples/adjtime/adjtime_main.c Normal file
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/****************************************************************************
* apps/examples/adjtime/adjtime_main.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <sys/time.h>
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: pwm_help
****************************************************************************/
static void adjtime_help(void)
{
printf("Usage: adjtime [OPTIONS]\n");
printf(" [-s delta->tv_sec] sets delta in seconds.\n");
printf(" [-u delta->tv_usec] sets delta in micro seconds.\n");
printf(" [-h] shows this message and exits\n");
printf("Both delta->tv_sec and delta->tv_usec are set to 0 by default\n");
}
/****************************************************************************
* Name: arg_string
****************************************************************************/
static int arg_string(FAR char **arg, FAR char **value)
{
FAR char *ptr = *arg;
if (ptr[2] == '\0')
{
*value = arg[1];
return 2;
}
else
{
*value = &ptr[2];
return 1;
}
}
/****************************************************************************
* Name: arg_decimal
****************************************************************************/
static int arg_decimal(FAR char **arg, FAR unsigned long *value)
{
FAR char *string;
int ret;
ret = arg_string(arg, &string);
*value = strtoul(string, NULL, 10);
return ret;
}
/****************************************************************************
* Name: parse_args
****************************************************************************/
static void parse_args(FAR struct timeval *delta, int argc,
FAR char **argv)
{
FAR char *ptr;
unsigned long value;
int index;
int nargs;
for (index = 1; index < argc; )
{
ptr = argv[index];
if (ptr[0] != '-')
{
printf("Invalid options format: %s\n", ptr);
exit(0);
}
switch (ptr[1])
{
case 's':
nargs = arg_decimal(&argv[index], &value);
delta->tv_sec = value;
index += nargs;
break;
case 'u':
nargs = arg_decimal(&argv[index], &value);
delta->tv_usec = value;
index += nargs;
break;
case 'h':
adjtime_help();
exit(0);
default:
printf("Unsupported option: %s\n", ptr);
adjtime_help();
exit(1);
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* adjtime_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
struct timeval delta;
struct timeval olddelta;
int ret;
/* Set delta between real time and system tick. */
delta.tv_sec = 0;
delta.tv_usec = 0;
parse_args(&delta, argc, argv);
printf("Delta time is %ld seconds and %ld micro seconds.\n",
delta.tv_sec, delta.tv_usec);
/* Call adjtime function. */
ret = adjtime(&delta, &olddelta);
if (ret < 0)
{
printf("ERROR: adjtime() failed: %d\n", ret);
}
else
{
printf("Returned olddelta is %ld seconds and %ld micro seconds.\n",
olddelta.tv_sec, olddelta.tv_usec);
}
return ret;
}