test_adc.c

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/**
 * @file test_adc.c
 * Test for the analog to digital converter.
 */

#include <px4_platform_common/time.h>
#include <px4_platform_common/px4_config.h>
#include <px4_platform_common/posix.h>
#include <px4_platform_common/log.h>

#include <sys/types.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include "tests_main.h"

#include <drivers/drv_adc.h>

int test_adc(int argc, char *argv[])
{
    int fd = px4_open(ADC0_DEVICE_PATH, O_RDONLY);

    if (fd < 0) {
        PX4_ERR("ERROR: can't open ADC device");
        return 1;
    }

    for (unsigned i = 0; i < 5; i++) {
        /* make space for a maximum number of channels */
        px4_adc_msg_t data[PX4_MAX_ADC_CHANNELS];
        /* read all channels available */
        ssize_t count = px4_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");
        px4_usleep(150000);
    }

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

errout_with_dev:

    if (fd != 0) { px4_close(fd); }

    return OK;
}