/****************************************************************************
 *
 *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * @file test_adc.c
 * Test for the analog to digital converter.
 */

#include <nuttx/config.h>
#include <nuttx/arch.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/spi.h>

#include "tests.h"

#include <nuttx/analog/adc.h>
#include <drivers/drv_adc.h>
#include <systemlib/err.h>

int test_adc(int argc, char *argv[])
{
	int fd = open(ADC0_DEVICE_PATH, O_RDONLY);

	if (fd < 0) {
		warnx("ERROR: can't open ADC device");
		return 1;
	}

	for (unsigned i = 0; i < 5; i++) {
		/* make space for a maximum of twelve channels */
		struct adc_msg_s data[12];
		/* read all channels available */
		ssize_t count = read(fd, data, sizeof(data));

		if (count < 0)
			goto errout_with_dev;

		unsigned channels = count / sizeof(data[0]);

		for (unsigned j = 0; j < channels; j++) {
			printf("%d: %u  ", data[j].am_channel, data[j].am_data);
		}

		printf("\n");
		usleep(150000);
	}

	warnx("\t ADC test successful.\n");

errout_with_dev:

	if (fd != 0) close(fd);

	return OK;
}