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Diffstat (limited to 'apps/examples/pwm/pwm_main.c')
-rw-r--r--apps/examples/pwm/pwm_main.c395
1 files changed, 0 insertions, 395 deletions
diff --git a/apps/examples/pwm/pwm_main.c b/apps/examples/pwm/pwm_main.c
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--- a/apps/examples/pwm/pwm_main.c
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-/****************************************************************************
- * examples/pwm/pwm_main.c
- *
- * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-
-#include <sys/types.h>
-#include <sys/ioctl.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <debug.h>
-#include <string.h>
-
-#include <nuttx/pwm.h>
-
-#include "pwm.h"
-
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/****************************************************************************
- * Private Types
- ****************************************************************************/
-
-struct pwm_state_s
-{
- bool initialized;
- FAR char *devpath;
- uint8_t duty;
- uint32_t freq;
-#ifdef CONFIG_PWM_PULSECOUNT
- uint32_t count;
-#endif
- int duration;
-};
-
-/****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-
-static struct pwm_state_s g_pwmstate;
-
-/****************************************************************************
- * Public Data
- ****************************************************************************/
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: pwm_devpath
- ****************************************************************************/
-
-static void pwm_devpath(FAR struct pwm_state_s *pwm, FAR const char *devpath)
-{
- /* Get rid of any old device path */
-
- if (pwm->devpath)
- {
- free(pwm->devpath);
- }
-
- /* Then set-up the new device path by copying the string */
-
- pwm->devpath = strdup(devpath);
-}
-
-/****************************************************************************
- * Name: pwm_help
- ****************************************************************************/
-
-static void pwm_help(FAR struct pwm_state_s *pwm)
-{
- message("Usage: pwm [OPTIONS]\n");
- message("\nArguments are \"sticky\". For example, once the PWM frequency is\n");
- message("specified, that frequency will be re-used until it is changed.\n");
- message("\n\"sticky\" OPTIONS include:\n");
- message(" [-p devpath] selects the PWM device. "
- "Default: %s Current: %s\n",
- CONFIG_EXAMPLES_PWM_DEVPATH, pwm->devpath ? pwm->devpath : "NONE");
- message(" [-f addr] selects the pulse frequency. "
- "Default: %d Hz Current: %d Hz\n",
- CONFIG_EXAMPLES_PWM_FREQUENCY, pwm->freq);
- message(" [-d duty] selcts the pulse duty as a percentage. "
- "Default: %d %% Current: %d %%\n",
- CONFIG_EXAMPLES_PWM_DUTYPCT, pwm->duty);
-#ifdef CONFIG_PWM_PULSECOUNT
- message(" [-n count] selects the pulse count. "
- "Default: %d Current: %d\n",
- CONFIG_EXAMPLES_PWM_COUNT, pwm->count);
-#endif
- message(" [-t duration] is the duration of the pulse train in seconds. "
- "Default: %d Current: %d\n",
- CONFIG_EXAMPLES_PWM_DURATION, pwm->duration);
- message(" [-h] shows this message and exits\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(FAR struct pwm_state_s *pwm, int argc, FAR char **argv)
-{
- FAR char *ptr;
- FAR char *str;
- long value;
- int index;
- int nargs;
-
- for (index = 1; index < argc; )
- {
- ptr = argv[index];
- if (ptr[0] != '-')
- {
- message("Invalid options format: %s\n", ptr);
- exit(0);
- }
-
- switch (ptr[1])
- {
- case 'f':
- nargs = arg_decimal(&argv[index], &value);
- if (value < 1)
- {
- message("Frequency out of range: %ld\n", value);
- exit(1);
- }
-
- pwm->freq = (uint32_t)value;
- index += nargs;
- break;
-
- case 'd':
- nargs = arg_decimal(&argv[index], &value);
- if (value < 1 || value > 99)
- {
- message("Duty out of range: %ld\n", value);
- exit(1);
- }
-
- pwm->duty = (uint8_t)value;
- index += nargs;
- break;
-
-#ifdef CONFIG_PWM_PULSECOUNT
- case 'n':
- nargs = arg_decimal(&argv[index], &value);
- if (value < 0)
- {
- message("Count must be non-negative: %ld\n", value);
- exit(1);
- }
-
- pwm->count = (uint32_t)value;
- index += nargs;
- break;
-
-#endif
- case 'p':
- nargs = arg_string(&argv[index], &str);
- pwm_devpath(pwm, str);
- index += nargs;
- break;
-
- case 't':
- nargs = arg_decimal(&argv[index], &value);
- if (value < 1 || value > INT_MAX)
- {
- message("Duration out of range: %ld\n", value);
- exit(1);
- }
-
- pwm->duration = (int)value;
- index += nargs;
- break;
-
- case 'h':
- pwm_help(pwm);
- exit(0);
-
- default:
- message("Unsupported option: %s\n", ptr);
- pwm_help(pwm);
- exit(1);
- }
- }
-}
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: pwm_main
- ****************************************************************************/
-
-int pwm_main(int argc, char *argv[])
-{
- struct pwm_info_s info;
- int fd;
- int ret;
-
- /* Initialize the state data */
-
- if (!g_pwmstate.initialized)
- {
- g_pwmstate.duty = CONFIG_EXAMPLES_PWM_DUTYPCT;
- g_pwmstate.freq = CONFIG_EXAMPLES_PWM_FREQUENCY;
- g_pwmstate.duration = CONFIG_EXAMPLES_PWM_DURATION;
-#ifdef CONFIG_PWM_PULSECOUNT
- g_pwmstate.count = CONFIG_EXAMPLES_PWM_COUNT;
-#endif
- g_pwmstate.initialized = true;
- }
-
- /* Parse the command line */
-
- parse_args(&g_pwmstate, argc, argv);
-
- /* Has a device been assigned? */
-
- if (!g_pwmstate.devpath)
- {
- /* No.. use the default device */
-
- pwm_devpath(&g_pwmstate, CONFIG_EXAMPLES_PWM_DEVPATH);
- }
-
- /* Initialization of the PWM hardware is performed by logic external to
- * this test.
- */
-
- ret = pwm_devinit();
- if (ret != OK)
- {
- message("pwm_main: pwm_devinit failed: %d\n", ret);
- goto errout;
- }
-
- /* Open the PWM device for reading */
-
- fd = open(g_pwmstate.devpath, O_RDONLY);
- if (fd < 0)
- {
- message("pwm_main: open %s failed: %d\n", g_pwmstate.devpath, errno);
- goto errout;
- }
-
- /* Configure the characteristics of the pulse train */
-
- info.frequency = g_pwmstate.freq;
- info.duty = ((uint32_t)g_pwmstate.duty << 16) / 100;
-#ifdef CONFIG_PWM_PULSECOUNT
- info.count = g_pwmstate.count;
-
- message("pwm_main: starting output with frequency: %d duty: %08x count: %d\n",
- info.frequency, info.duty, info.count);
-
-#else
- message("pwm_main: starting output with frequency: %d duty: %08x\n",
- info.frequency, info.duty);
-
-#endif
-
- ret = ioctl(fd, PWMIOC_SETCHARACTERISTICS, (unsigned long)((uintptr_t)&info));
- if (ret < 0)
- {
- message("pwm_main: ioctl(PWMIOC_SETCHARACTERISTICS) failed: %d\n", errno);
- goto errout_with_dev;
- }
-
- /* Then start the pulse train. Since the driver was opened in blocking
- * mode, this call will block if the count value is greater than zero.
- */
-
- ret = ioctl(fd, PWMIOC_START, 0);
- if (ret < 0)
- {
- message("pwm_main: ioctl(PWMIOC_START) failed: %d\n", errno);
- goto errout_with_dev;
- }
-
- /* It a non-zero count was not specified, then wait for the selected
- * duration, then stop the PWM output.
- */
-
-#ifdef CONFIG_PWM_PULSECOUNT
- if (info.count == 0)
-#endif
- {
- /* Wait for the specified duration */
-
- sleep(g_pwmstate.duration);
-
- /* Then stop the pulse train */
-
- message("pwm_main: stopping output\n", info.frequency, info.duty);
-
- ret = ioctl(fd, PWMIOC_STOP, 0);
- if (ret < 0)
- {
- message("pwm_main: ioctl(PWMIOC_STOP) failed: %d\n", errno);
- goto errout_with_dev;
- }
- }
-
- close(fd);
- msgflush();
- return OK;
-
-errout_with_dev:
- close(fd);
-errout:
- msgflush();
- return ERROR;
-}
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