/****************************************************************************
* examples/adc/adc_main.c
*
* Copyright (C) 2011 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 <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/analog/adc.h>
#include "adc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_NSH_BUILTIN_APPS
# define MAIN_NAME adc_main
# define MAIN_STRING "adc_main: "
#else
# define MAIN_NAME user_start
# define MAIN_STRING "user_start: "
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: user_start/adc_main
****************************************************************************/
int MAIN_NAME(int argc, char *argv[])
{
struct adc_msg_s sample[CONFIG_EXAMPLES_ADC_GROUPSIZE];
size_t readsize;
ssize_t nbytes;
#if defined(CONFIG_NSH_BUILTIN_APPS) || defined(CONFIG_EXAMPLES_ADC_NSAMPLES)
long nloops;
#endif
int fd;
int errval = 0;
int ret;
int i;
/* 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)
nloops = 1;
if (argc > 1)
{
nloops = strtol(argv[1], NULL, 10);
}
message(MAIN_STRING "nloops: %d\n", nloops);
#elif defined(CONFIG_EXAMPLES_ADC_NSAMPLES)
message(MAIN_STRING "nloops: %d\n", CONFIG_EXAMPLES_ADC_NSAMPLES);
#endif
/* Initialization of the ADC hardware is performed by logic external to
* this test.
*/
message(MAIN_STRING "Initializing external ADC device\n");
ret = adc_devinit();
if (ret != OK)
{
message(MAIN_STRING "adc_devinit failed: %d\n", ret);
errval = 1;
goto errout;
}
/* Open the ADC device for reading */
message(MAIN_STRING "Hardware initialized. Opening the ADC device\n");
fd = open(CONFIG_EXAMPLES_ADC_DEVPATH, O_RDONLY);
if (fd < 0)
{
message(MAIN_STRING "open %s failed: %d\n",
CONFIG_EXAMPLES_ADC_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 (; nloops > 0; nloops--)
#elif defined(CONFIG_EXAMPLES_ADC_NSAMPLES)
for (nloops = 0; nloops < CONFIG_EXAMPLES_ADC_NSAMPLES; nloops++)
#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(MAIN_STRING "read %s failed: %d\n",
CONFIG_EXAMPLES_ADC_DEVPATH, errval);
errval = 3;
goto errout_with_dev;
}
message(MAIN_STRING "Interrupted read...\n");
}
else if (nbytes == 0)
{
message(MAIN_STRING "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(MAIN_STRING "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;
}
