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Diffstat (limited to 'apps/examples/adc/adc_main.c')
| -rw-r--r-- | apps/examples/adc/adc_main.c | 209 |
1 files changed, 209 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..3a1a1be44 --- /dev/null +++ b/apps/examples/adc/adc_main.c @@ -0,0 +1,209 @@ +/**************************************************************************** + * examples/adc/adc_main.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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[]) +{ + uintt_t sample[CONFIG_EXAMPLES_ADC_SAMPLESIZE]; + ssize_t nbytes; +#if defined(CONFIG_NSH_BUILTIN_APPS) || defined(CONFIG_EXAMPLES_ADC_NSAMPLES) + long nsamples; +#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) + nsamples = 1; + if (argc > 1) + { + nsamples = strtol(argv[1], NULL, 10); + } + message(MAIN_STRING "nsamples: %d\n", nsamples); +#elif defined(CONFIG_EXAMPLES_ADC_NSAMPLES) + message(MAIN_STRING "nsamples: %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 */ + + 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 (; nsamples > 0; nsamples--) +#elif defined(CONFIG_EXAMPLES_ADC_NSAMPLES) + for (nsamples = 0; nsamples < CONFIG_EXAMPLES_ADC_NSAMPLES; nsamples++) +#else + for (;;) +#endif + { + /* Flush any output before the loop entered or from the previous pass + * through the loop. + */ + + msgflush(); + + /* Read one sample */ + + nbytes = read(fd, sample,CONFIG_EXAMPLES_ADC_SAMPLESIZE )); + ivdbg("Bytes read: %d\n", nbytes); + + /* 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 != CONFIG_EXAMPLES_ADC_SAMPLESIZE) + { + message(MAIN_STRING "Unexpected read size=%d, expected=%d, Ignoring\n", + nbytes, CONFIG_EXAMPLES_ADC_SAMPLESIZE); + } + + /* Print the sample data on successful return */ + + else + { + message("Sample :\n"); + for (i = 0; i < CONFIG_EXAMPLES_ADC_SAMPLESIZE; i++) + { + message("%d: %02x\n", i, sample[i]); + } + } + } + +errout_with_dev: + close(fd); +errout_with_dev: +errout: + message("Terminating!\n"); + msgflush(); + return errval; +} |