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px4-firmware/apps/examples/adc/adc_main.c

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/****************************************************************************
* examples/adc/adc_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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/analog/adc.h>
#include "adc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Use CONFIG_EXAMPLES_ADC_NSAMPLES == 0 to mean to collect samples
* indefinitely.
*/
#ifndef CONFIG_EXAMPLES_ADC_NSAMPLES
# define CONFIG_EXAMPLES_ADC_NSAMPLES 0
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static struct adc_state_s g_adcstate;
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: adc_devpath
****************************************************************************/
static void adc_devpath(FAR struct adc_state_s *adc, FAR const char *devpath)
{
/* Get rid of any old device path */
if (adc->devpath)
{
free(adc->devpath);
}
/* Then set-up the new device path by copying the string */
adc->devpath = strdup(devpath);
}
/****************************************************************************
* Name: adc_help
****************************************************************************/
#ifdef CONFIG_NSH_BUILTIN_APPS
static void adc_help(FAR struct adc_state_s *adc)
{
message("Usage: adc [OPTIONS]\n");
message("\nArguments are \"sticky\". For example, once the ADC device is\n");
message("specified, that device will be re-used until it is changed.\n");
message("\n\"sticky\" OPTIONS include:\n");
message(" [-p devpath] selects the ADC device. "
"Default: %s Current: %s\n",
CONFIG_EXAMPLES_ADC_DEVPATH, g_adcstate.devpath ? g_adcstate.devpath : "NONE");
message(" [-n count] selects the samples to collect. "
"Default: 1 Current: %d\n", adc->count);
message(" [-h] shows this message and exits\n");
}
#endif
/****************************************************************************
* Name: arg_string
****************************************************************************/
#ifdef CONFIG_NSH_BUILTIN_APPS
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;
}
}
#endif
/****************************************************************************
* Name: arg_decimal
****************************************************************************/
#ifdef CONFIG_NSH_BUILTIN_APPS
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;
}
#endif
/****************************************************************************
* Name: parse_args
****************************************************************************/
#ifdef CONFIG_NSH_BUILTIN_APPS
static void parse_args(FAR struct adc_state_s *adc, 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 'n':
nargs = arg_decimal(&argv[index], &value);
if (value < 0)
{
message("Count must be non-negative: %ld\n", value);
exit(1);
}
adc->count = (uint32_t)value;
index += nargs;
break;
case 'p':
nargs = arg_string(&argv[index], &str);
adc_devpath(adc, str);
index += nargs;
break;
case 'h':
adc_help(adc);
exit(0);
default:
message("Unsupported option: %s\n", ptr);
adc_help(adc);
exit(1);
}
}
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: adc_main
****************************************************************************/
int adc_main(int argc, char *argv[])
{
struct adc_msg_s sample[CONFIG_EXAMPLES_ADC_GROUPSIZE];
size_t readsize;
ssize_t nbytes;
int fd;
int errval = 0;
int ret;
int i;
/* Check if we have initialized */
if (!g_adcstate.initialized)
{
/* Initialization of the ADC hardware is performed by logic external to
* this test.
*/
message("adc_main: Initializing external ADC device\n");
ret = adc_devinit();
if (ret != OK)
{
message("adc_main: adc_devinit failed: %d\n", ret);
errval = 1;
goto errout;
}
/* Set the default values */
adc_devpath(&g_adcstate, CONFIG_EXAMPLES_ADC_DEVPATH);
#if CONFIG_EXAMPLES_ADC_NSAMPLES > 0
g_adcstate.count = CONFIG_EXAMPLES_ADC_NSAMPLES;
#else
g_adcstate.count = 1;
#endif
g_adcstate.initialized = true;
}
/* Parse the command line */
#ifdef CONFIG_NSH_BUILTIN_APPS
parse_args(&g_adcstate, argc, argv);
#endif
/* If this example is configured as an NX add-on, then limit the number of
* samples that we collect before returning. Otherwise, we never return
*/
#if defined(CONFIG_NSH_BUILTIN_APPS) || CONFIG_EXAMPLES_ADC_NSAMPLES > 0
message("adc_main: g_adcstate.count: %d\n", g_adcstate.count);
#endif
/* Open the ADC device for reading */
message("adc_main: Hardware initialized. Opening the ADC device: %s\n",
g_adcstate.devpath);
fd = open(g_adcstate.devpath, O_RDONLY);
if (fd < 0)
{
message("adc_main: open %s failed: %d\n", g_adcstate.devpath, errno);
errval = 2;
goto errout_with_dev;
}
/* Now loop the appropriate number of times, displaying the collected
* ADC samples.
*/
#if defined(CONFIG_NSH_BUILTIN_APPS)
for (; g_adcstate.count > 0; g_adcstate.count--)
#elif CONFIG_EXAMPLES_ADC_NSAMPLES > 0
for (g_adcstate.count = 0; g_adcstate.count < CONFIG_EXAMPLES_ADC_NSAMPLES; g_adcstate.count++)
#else
for (;;)
#endif
{
/* Flush any output before the loop entered or from the previous pass
* through the loop.
*/
msgflush();
/* Read CONFIG_EXAMPLES_ADC_GROUPSIZE samples */
readsize = CONFIG_EXAMPLES_ADC_GROUPSIZE * sizeof(struct adc_msg_s);
nbytes = read(fd, sample, readsize);
/* Handle unexpected return values */
if (nbytes < 0)
{
errval = errno;
if (errval != EINTR)
{
message("adc_main: read %s failed: %d\n",
g_adcstate.devpath, errval);
errval = 3;
goto errout_with_dev;
}
message("adc_main: Interrupted read...\n");
}
else if (nbytes == 0)
{
message("adc_main: No data read, Ignoring\n");
}
/* Print the sample data on successful return */
else
{
int nsamples = nbytes / sizeof(struct adc_msg_s);
if (nsamples * sizeof(struct adc_msg_s) != nbytes)
{
message("adc_main: read size=%d is not a multiple of sample size=%d, Ignoring\n",
nbytes, sizeof(struct adc_msg_s));
}
else
{
message("Sample:\n");
for (i = 0; i < nsamples ; i++)
{
message("%d: channel: %d value: %d\n",
i, sample[i].am_channel, sample[i].am_data);
}
}
}
}
errout_with_dev:
close(fd);
errout:
message("Terminating!\n");
msgflush();
return errval;
}
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