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new e7961a696 examples: add pwm input capture example
e7961a696 is described below
commit e7961a696e1fdcc6baf50d416a266dcece745240
Author: zouboan <[email protected]>
AuthorDate: Tue Jun 28 20:05:27 2022 +0800
examples: add pwm input capture example
Co-authored-by: Alan Carvalho de Assis <[email protected]>
---
examples/capture/Kconfig | 36 ++++++
examples/capture/Make.defs | 23 ++++
examples/capture/Makefile | 34 +++++
examples/capture/cap.h | 51 ++++++++
examples/capture/cap_main.c | 305 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 449 insertions(+)
diff --git a/examples/capture/Kconfig b/examples/capture/Kconfig
new file mode 100644
index 000000000..b5b5ba068
--- /dev/null
+++ b/examples/capture/Kconfig
@@ -0,0 +1,36 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_CAPTURE
+ tristate "PWM Capture example"
+ default n
+ depends on CAPTURE
+ ---help---
+ Enable the pwm capture example
+
+if EXAMPLES_CAPTURE
+
+config EXAMPLES_CAPTURE_DEVPATH
+ string "Capture device path"
+ default "/dev/capture0"
+ ---help---
+ The default path to the capture device
+
+config EXAMPLES_CAPTURE_NSAMPLES
+ int "Number of samples"
+ default 0
+ ---help---
+ This number of samples is collected and the program
+ terminates. If the value is 0, samples are collected
indefinitely.
+
+config EXAMPLES_CAPTURE_DELAY
+ int "Delay between samples"
+ default 100
+ ---help---
+ This value provides the delay (in milliseconds) between each
sample.
+ If CONFIG_NSH_BUILTIN_APPS is defined, then this value is the
default
+ delay if no other delay is provided on the command line.
+
+endif
diff --git a/examples/capture/Make.defs b/examples/capture/Make.defs
new file mode 100644
index 000000000..de9fcd063
--- /dev/null
+++ b/examples/capture/Make.defs
@@ -0,0 +1,23 @@
+############################################################################
+# apps/examples/capture/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_CAPTURE),)
+CONFIGURED_APPS += $(APPDIR)/examples/capture
+endif
diff --git a/examples/capture/Makefile b/examples/capture/Makefile
new file mode 100644
index 000000000..db92c71f0
--- /dev/null
+++ b/examples/capture/Makefile
@@ -0,0 +1,34 @@
+############################################################################
+# apps/examples/capture/Makefile
+#
+# 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
+
+# PWM Input Capture Example.
+
+MAINSRC = cap_main.c
+
+# PWM input capture built-in application info
+
+PROGNAME = cap
+PRIORITY = SCHED_PRIORITY_DEFAULT
+STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_CAPTURE)
+
+include $(APPDIR)/Application.mk
diff --git a/examples/capture/cap.h b/examples/capture/cap.h
new file mode 100644
index 000000000..1e218ec44
--- /dev/null
+++ b/examples/capture/cap.h
@@ -0,0 +1,51 @@
+/****************************************************************************
+ * apps/examples/capture/cap.h
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_EXAMPLES_CAPTURE_QE_H
+#define __APPS_EXAMPLES_CAPTURE_QE_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct cap_example_s
+{
+ FAR char *devpath; /* Path to the capture device */
+ unsigned int nloops; /* Collect this number of samples */
+ unsigned int delay; /* Delay this number of seconds between samples */
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+extern struct cap_example_s g_capexample;
+
+#endif /* __APPS_EXAMPLES_CAPTURE_QE_H */
diff --git a/examples/capture/cap_main.c b/examples/capture/cap_main.c
new file mode 100644
index 000000000..11fac3721
--- /dev/null
+++ b/examples/capture/cap_main.c
@@ -0,0 +1,305 @@
+/****************************************************************************
+ * apps/examples/capture/cap_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 <sys/types.h>
+#include <sys/ioctl.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/timers/capture.h>
+
+#include "cap.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+struct cap_example_s g_capexample;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cap_devpath
+ ****************************************************************************/
+
+static void cap_devpath(FAR const char *devpath)
+{
+ /* Get rid of any old device path */
+
+ if (g_capexample.devpath)
+ {
+ free(g_capexample.devpath);
+ }
+
+ /* The set-up the new device path by copying the string */
+
+ g_capexample.devpath = strdup(devpath);
+}
+
+/****************************************************************************
+ * Name: cap_help
+ ****************************************************************************/
+
+static void cap_help(void)
+{
+ printf("\nUsage: cap [OPTIONS]\n\n");
+ printf("OPTIONS include:\n");
+ printf(" [-p devpath] Capture device path\n");
+ printf(" [-n samples] Number of samples\n");
+ printf(" [-t msec] Delay between samples (msec)\n");
+ printf(" [-h] Shows this message and exits\n\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 long *value)
+{
+ FAR char *string;
+ int ret;
+
+ ret = arg_string(arg, &string);
+ *value = strtol(string, NULL, 10);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: parse_args
+ ****************************************************************************/
+
+static void parse_args(int argc, FAR char **argv)
+{
+ FAR char *ptr;
+ FAR char *str;
+ long value;
+ int index;
+ int nargs;
+
+ g_capexample.nloops = CONFIG_EXAMPLES_CAPTURE_NSAMPLES;
+ g_capexample.delay = CONFIG_EXAMPLES_CAPTURE_DELAY;
+
+ for (index = 1; index < argc; )
+ {
+ ptr = argv[index];
+ if (ptr[0] != '-')
+ {
+ printf("Invalid options format: %s\n", ptr);
+ exit(0);
+ }
+
+ switch (ptr[1])
+ {
+ case 'n':
+ nargs = arg_decimal(&argv[index], &value);
+ if (value < 0 || value > INT_MAX)
+ {
+ printf("Sample count out of range: %ld\n", value);
+ exit(1);
+ }
+
+ g_capexample.nloops = (unsigned int)value;
+ index += nargs;
+ break;
+
+ case 'p':
+ nargs = arg_string(&argv[index], &str);
+ cap_devpath(str);
+ index += nargs;
+ break;
+
+ case 't':
+ nargs = arg_decimal(&argv[index], &value);
+ if (value < 0 || value > INT_MAX)
+ {
+ printf("Sample delay out of range: %ld\n", value);
+ exit(1);
+ }
+
+ g_capexample.delay = (unsigned int)value;
+ index += nargs;
+ break;
+
+ case 'h':
+ cap_help();
+ exit(EXIT_SUCCESS);
+
+ default:
+ printf("Unsupported option: %s\n", ptr);
+ cap_help();
+ exit(EXIT_FAILURE);
+ }
+ }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cap_main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+ int8_t dutycycle;
+ int32_t frequence;
+ int fd;
+ int exitval = EXIT_SUCCESS;
+ int ret;
+ int nloops;
+
+ /* Set the default values */
+
+ cap_devpath(CONFIG_EXAMPLES_CAPTURE_DEVPATH);
+
+ /* Parse command line arguments */
+
+ parse_args(argc, argv);
+
+ /* Open the capture device for reading */
+
+ printf("cap_main: Hardware initialized. Opening the capture device: %s\n",
+ g_capexample.devpath);
+
+ fd = open(g_capexample.devpath, O_RDONLY);
+ if (fd < 0)
+ {
+ printf("cap_main: open %s failed: %d\n", g_capexample.devpath, errno);
+ exitval = EXIT_FAILURE;
+ goto errout;
+ }
+
+ /* Now loop the appropriate number of times, displaying the collected
+ * encoder samples.
+ */
+
+ printf("cap_main: Number of samples: %u\n", g_capexample.nloops);
+ for (nloops = 0;
+ !g_capexample.nloops || nloops < g_capexample.nloops;
+ nloops++)
+ {
+ /* Flush any output before the loop entered or from the previous pass
+ * through the loop.
+ */
+
+ fflush(stdout);
+
+ /* Get the dutycycle data using the ioctl */
+
+ ret = ioctl(fd, CAPIOC_DUTYCYCLE,
+ (unsigned long)((uintptr_t)&dutycycle));
+ if (ret < 0)
+ {
+ printf("cap_main: ioctl(CAPIOC_DUTYCYCLE) failed: %d\n", errno);
+ exitval = EXIT_FAILURE;
+ goto errout_with_dev;
+ }
+
+ /* Print the sample data on successful return */
+
+ else
+ {
+ printf("pwm duty cycle: %d % \n", dutycycle);
+ }
+
+ /* Get the frequence data using the ioctl */
+
+ ret = ioctl(fd, CAPIOC_FREQUENCE,
+ (unsigned long)((uintptr_t)&frequence));
+ if (ret < 0)
+ {
+ printf("cap_main: ioctl(CAPIOC_FREQUENCE) failed: %d\n", errno);
+ exitval = EXIT_FAILURE;
+ goto errout_with_dev;
+ }
+
+ /* Print the sample data on successful return */
+
+ else
+ {
+ printf("pwm frequence: %d Hz \n", frequence);
+ }
+
+ /* Delay a little bit */
+
+ usleep(g_capexample.delay * 1000);
+ }
+
+errout_with_dev:
+ close(fd);
+
+errout:
+ printf("Terminating!\n");
+ fflush(stdout);
+ return exitval;
+}
