/****************************************************************************
* apps/examples/adc/adc_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 <errno.h>
#include <debug.h>
#include <nuttx/analog/adc.h>
#include <nuttx/analog/ioctl.h>
#include "adc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* 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
****************************************************************************/
static void adc_help(FAR struct adc_state_s *adc)
{
printf("Usage: adc [OPTIONS]\n");
printf("\nArguments are \"sticky\". "
"For example, once the ADC device is\n");
printf("specified, that device will be re-used until it is changed.\n");
printf("\n\"sticky\" OPTIONS include:\n");
printf(" [-p devpath] selects the ADC device. "
"Default: %s Current: %s\n",
CONFIG_EXAMPLES_ADC_DEVPATH,
g_adcstate.devpath ? g_adcstate.devpath : "NONE");
printf(" [-n count] selects the samples to collect. "
"Default: 1 Current: %d\n", adc->count);
printf(" [-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 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] != '-')
{
printf("Invalid options format: %s\n", ptr);
exit(0);
}
switch (ptr[1])
{
case 'n':
nargs = arg_decimal(&argv[index], &value);
if (value < 0)
{
printf("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:
printf("Unsupported option: %s\n", ptr);
adc_help(adc);
exit(1);
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: adc_main
****************************************************************************/
int main(int argc, FAR 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;
UNUSED(ret);
/* Check if we have initialized */
if (!g_adcstate.initialized)
{
/* Initialization of the ADC hardware must be performed by
* board-specific logic prior to running this test.
*/
/* Set the default values */
adc_devpath(&g_adcstate, CONFIG_EXAMPLES_ADC_DEVPATH);
g_adcstate.initialized = true;
}
g_adcstate.count = CONFIG_EXAMPLES_ADC_NSAMPLES;
/* Parse the command line */
parse_args(&g_adcstate, argc, argv);
/* 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
*/
printf("adc_main: g_adcstate.count: %d\n", g_adcstate.count);
/* Open the ADC device for reading */
printf("adc_main: Hardware initialized. Opening the ADC device: %s\n",
g_adcstate.devpath);
fd = open(g_adcstate.devpath, O_RDONLY);
if (fd < 0)
{
printf("adc_main: open %s failed: %d\n", g_adcstate.devpath, errno);
errval = 2;
goto errout;
}
/* Now loop the appropriate number of times, displaying the collected
* ADC samples.
*/
for (; ; )
{
/* Flush any output before the loop entered or from the previous pass
* through the loop.
*/
fflush(stdout);
#ifdef CONFIG_EXAMPLES_ADC_SWTRIG
/* Issue the software trigger to start ADC conversion */
ret = ioctl(fd, ANIOC_TRIGGER, 0);
if (ret < 0)
{
int errcode = errno;
printf("adc_main: ANIOC_TRIGGER ioctl failed: %d\n", errcode);
}
#endif
/* Read up to 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)
{
printf("adc_main: read %s failed: %d\n",
g_adcstate.devpath, errval);
errval = 3;
goto errout_with_dev;
}
printf("adc_main: Interrupted read...\n");
}
else if (nbytes == 0)
{
printf("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)
{
printf("adc_main: read size=%ld is not a multiple of "
"sample size=%d, Ignoring\n",
(long)nbytes, sizeof(struct adc_msg_s));
}
else
{
printf("Sample:\n");
for (i = 0; i < nsamples; i++)
{
printf("%d: channel: %d value: %" PRId32 "\n",
i + 1, sample[i].am_channel, sample[i].am_data);
}
}
}
if (g_adcstate.count && --g_adcstate.count <= 0)
{
break;
}
}
close(fd);
return OK;
/* Error exits */
errout_with_dev:
close(fd);
errout:
printf("Terminating!\n");
fflush(stdout);
return errval;
}