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examples: add pulse count example

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add pulse count driver example. Previously it was mixed with PWM example.

Signed-off-by: raiden00pl <raiden00@railab.me>
This commit is contained in:
raiden00pl 2026-05-20 09:26:55 +02:00 • committed by Xiang Xiao
parent 2ad3e4e17b
commit 5cce60aa9a
5 changed files with 379 additions and 0 deletions
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33
examples/pulsecount/CMakeLists.txt Normal file
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# ##############################################################################
# apps/examples/pulsecount/CMakeLists.txt
#
# SPDX-License-Identifier: Apache-2.0
#
# 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.
#
# ##############################################################################
if(CONFIG_EXAMPLES_PULSECOUNT)
nuttx_add_application(
NAME
pulsecount
STACKSIZE
${CONFIG_DEFAULT_TASK_STACKSIZE}
MODULE
${CONFIG_EXAMPLES_PULSECOUNT}
SRCS
pulsecount_main.c)
endif()

42
examples/pulsecount/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_PULSECOUNT
tristate "pulsecount example"
default n
depends on PULSECOUNT
---help---
Enable the finite pulsecount example
if EXAMPLES_PULSECOUNT
config EXAMPLES_PULSECOUNT_DEVPATH
string "pulsecount device path"
default "/dev/pulsecount0"
---help---
The path to the pulsecount device. Default: /dev/pulsecount0
config EXAMPLES_PULSECOUNT_HIGH_NS
int "Default pulsecount high time"
default 5000000
---help---
The default pulsecount high time in nanoseconds.
Default: 5000000 ns
config EXAMPLES_PULSECOUNT_LOW_NS
int "Default pulsecount low time"
default 5000000
---help---
The default pulsecount low time in nanoseconds.
Default: 5000000 ns
config EXAMPLES_PULSECOUNT_COUNT
int "Default pulsecount count"
default 100
range 1 2147483647
---help---
The default number of pulses to generate.
endif

25
examples/pulsecount/Make.defs Normal file
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############################################################################
# apps/examples/pulsecount/Make.defs
#
# SPDX-License-Identifier: Apache-2.0
#
# 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_PULSECOUNT),)
CONFIGURED_APPS += $(APPDIR)/examples/pulsecount
endif

32
examples/pulsecount/Makefile Normal file
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############################################################################
# apps/examples/pulsecount/Makefile
#
# SPDX-License-Identifier: Apache-2.0
#
# 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
MAINSRC = pulsecount_main.c
PROGNAME = pulsecount
PRIORITY = SCHED_PRIORITY_DEFAULT
STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
MODULE = $(CONFIG_EXAMPLES_PULSECOUNT)
include $(APPDIR)/Application.mk

247
examples/pulsecount/pulsecount_main.c Normal file
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/****************************************************************************
* apps/examples/pulsecount/pulsecount_main.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 <sys/ioctl.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <nuttx/timers/pulsecount.h>
/****************************************************************************
* Private Types
****************************************************************************/
struct pulsecount_state_s
{
FAR char *devpath;
uint32_t high_ns;
uint32_t low_ns;
uint32_t count;
};
/****************************************************************************
* Private Functions
****************************************************************************/
static void pulsecount_devpath(FAR struct pulsecount_state_s *state,
FAR const char *devpath)
{
if (state->devpath != NULL)
{
free(state->devpath);
}
state->devpath = strdup(devpath);
}
static int arg_string(FAR char **arg, FAR char **value)
{
FAR char *ptr = *arg;
if (ptr[2] == '\0')
{
*value = arg[1];
return 2;
}
*value = &ptr[2];
return 1;
}
static int arg_decimal(FAR char **arg, FAR long *value)
{
FAR char *string;
int ret;
ret = arg_string(arg, &string);
*value = strtol(string, NULL, 10);
return ret;
}
static void pulsecount_help(FAR struct pulsecount_state_s *state)
{
printf("Usage: pulsecount [OPTIONS]\n");
printf(" [-p devpath] Default: %s Current: %s\n",
CONFIG_EXAMPLES_PULSECOUNT_DEVPATH,
state->devpath != NULL ? state->devpath : "NONE");
printf(" [-H high-ns] Default: %d ns Current: %" PRIu32 " ns\n",
CONFIG_EXAMPLES_PULSECOUNT_HIGH_NS, state->high_ns);
printf(" [-L low-ns] Default: %d ns Current: %" PRIu32 " ns\n",
CONFIG_EXAMPLES_PULSECOUNT_LOW_NS, state->low_ns);
printf(" [-n count] Default: %d Current: %" PRIu32 "\n",
CONFIG_EXAMPLES_PULSECOUNT_COUNT, state->count);
printf(" [-h] shows this message and exits\n");
}
static void parse_args(FAR struct pulsecount_state_s *state, int argc,
FAR char **argv)
{
FAR char *str;
long value;
int index;
int nargs;
for (index = 1; index < argc; )
{
if (argv[index][0] != '-')
{
printf("Invalid options format: %s\n", argv[index]);
exit(1);
}
switch (argv[index][1])
{
case 'p':
nargs = arg_string(&argv[index], &str);
pulsecount_devpath(state, str);
index += nargs;
break;
case 'H':
nargs = arg_decimal(&argv[index], &value);
if (value < 1)
{
printf("High time out of range: %ld\n", value);
exit(1);
}
state->high_ns = (uint32_t)value;
index += nargs;
break;
case 'L':
nargs = arg_decimal(&argv[index], &value);
if (value < 1)
{
printf("Low time out of range: %ld\n", value);
exit(1);
}
state->low_ns = (uint32_t)value;
index += nargs;
break;
case 'n':
nargs = arg_decimal(&argv[index], &value);
if (value < 1)
{
printf("Count out of range: %ld\n", value);
exit(1);
}
state->count = (uint32_t)value;
index += nargs;
break;
case 'h':
pulsecount_help(state);
exit(0);
default:
printf("Unsupported option: %s\n", argv[index]);
pulsecount_help(state);
exit(1);
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
int main(int argc, FAR char *argv[])
{
struct pulsecount_state_s state;
struct pulsecount_info_s info;
int fd;
int ret;
/* Defaults */
memset(&state, 0, sizeof(state));
state.high_ns = CONFIG_EXAMPLES_PULSECOUNT_HIGH_NS;
state.low_ns = CONFIG_EXAMPLES_PULSECOUNT_LOW_NS;
state.count = CONFIG_EXAMPLES_PULSECOUNT_COUNT;
/* Parse args */
parse_args(&state, argc, argv);
if (state.devpath == NULL)
{
pulsecount_devpath(&state, CONFIG_EXAMPLES_PULSECOUNT_DEVPATH);
}
fd = open(state.devpath, O_RDONLY);
if (fd < 0)
{
printf("pulsecount: open %s failed: %d\n", state.devpath, errno);
goto errout;
}
memset(&info, 0, sizeof(info));
info.high_ns = state.high_ns;
info.low_ns = state.low_ns;
info.count = state.count;
printf("pulsecount: high: %" PRIu32 " ns low: %" PRIu32
" ns count: %" PRIu32 "\n",
info.high_ns, info.low_ns, info.count);
ret = ioctl(fd, PULSECOUNTIOC_SETCHARACTERISTICS,
(unsigned long)((uintptr_t)&info));
if (ret < 0)
{
printf("pulsecount: ioctl(PULSECOUNTIOC_SETCHARACTERISTICS) "
"failed: %d\n", errno);
goto errout_with_dev;
}
ret = ioctl(fd, PULSECOUNTIOC_START, 0);
if (ret < 0)
{
printf("pulsecount: ioctl(PULSECOUNTIOC_START) failed: %d\n", errno);
goto errout_with_dev;
}
close(fd);
fflush(stdout);
return OK;
errout_with_dev:
close(fd);
errout:
fflush(stdout);
return ERROR;
}