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Diffstat (limited to 'apps/examples/adc/adc_main.c')
-rw-r--r-- | apps/examples/adc/adc_main.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/apps/examples/adc/adc_main.c b/apps/examples/adc/adc_main.c new file mode 100644 index 000000000..b88032654 --- /dev/null +++ b/apps/examples/adc/adc_main.c @@ -0,0 +1,367 @@ +/**************************************************************************** + * 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 + ****************************************************************************/ + +#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 + ****************************************************************************/ + +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: 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; + 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(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; + } + + /* Set the default values */ + + adc_devpath(&g_adcstate, CONFIG_EXAMPLES_ADC_DEVPATH); + +#ifdef CONFIG_EXAMPLES_ADC_NSAMPLES + 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) || defined(CONFIG_EXAMPLES_ADC_NSAMPLES) + message(MAIN_STRING "g_adcstate.count: %d\n", g_adcstate.count); +#endif + + /* Open the ADC device for reading */ + + message(MAIN_STRING "Hardware initialized. Opening the ADC device: %s\n", + g_adcstate.devpath); + + fd = open(g_adcstate.devpath, O_RDONLY); + if (fd < 0) + { + message(MAIN_STRING "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 defined(CONFIG_EXAMPLES_ADC_NSAMPLES) + 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(MAIN_STRING "read %s failed: %d\n", + g_adcstate.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; +} |