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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
*
* 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 PX4 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.
*
****************************************************************************/
/**
* @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>
int test_adc(int argc, char *argv[])
{
int fd0 = 0;
int ret = 0;
#pragma pack(push,1)
struct adc_msg4_s {
uint8_t am_channel1; /**< The 8-bit ADC Channel 1 */
int32_t am_data1; /**< ADC convert result 1 (4 bytes) */
uint8_t am_channel2; /**< The 8-bit ADC Channel 2 */
int32_t am_data2; /**< ADC convert result 2 (4 bytes) */
uint8_t am_channel3; /**< The 8-bit ADC Channel 3 */
int32_t am_data3; /**< ADC convert result 3 (4 bytes) */
uint8_t am_channel4; /**< The 8-bit ADC Channel 4 */
int32_t am_data4; /**< ADC convert result 4 (4 bytes) */
};
#pragma pack(pop)
struct adc_msg4_s sample1;
ssize_t nbytes;
int j;
int errval;
fd0 = open("/dev/adc0", O_RDONLY | O_NONBLOCK);
if (fd0 <= 0) {
message("/dev/adc0 open fail: %d\n", errno);
return ERROR;
} else {
message("opened /dev/adc0 successfully\n");
}
usleep(10000);
for (j = 0; j < 10; j++) {
/* sleep 20 milliseconds */
usleep(20000);
nbytes = read(fd0, &sample1, sizeof(sample1));
/* Handle unexpected return values */
if (nbytes < 0) {
errval = errno;
if (errval != EINTR) {
message("reading /dev/adc0 failed: %d\n", errval);
errval = 3;
goto errout_with_dev;
}
message("\tinterrupted read..\n");
} else if (nbytes == 0) {
message("\tno data read, ignoring.\n");
ret = ERROR;
}
/* Print the sample data on successful return */
else {
if (nbytes != sizeof(sample1)) {
message("\tsample 1 size %d is not matching struct size %d, ignoring\n",
nbytes, sizeof(sample1));
ret = ERROR;
} else {
message("CYCLE %d:\n", j);
message("channel: %d value: %d\n",
(int)sample1.am_channel1, sample1.am_data1);
message("channel: %d value: %d\n",
(int)sample1.am_channel2, sample1.am_data2);
message("channel: %d value: %d\n",
(int)sample1.am_channel3, sample1.am_data3);
message("channel: %d value: %d\n",
(int)sample1.am_channel4, sample1.am_data4);
}
}
fflush(stdout);
}
message("\t ADC test successful.\n");
errout_with_dev:
if (fd0 != 0) close(fd0);
return ret;
}
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