sam9260 adc 测试

/*
 * adc_test.c
 *
 * Copyright (C) 2007 Mengrz
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/unistd.h>
#include <sys/stat.h>
#include <linux/fcntl.h>
#include <linux/ioctl.h>

#include "adc.h"

int main(int argc, char *argv[])
{
    if (argc < 2) {
    printf("Useage: %s dev
", argv[0]);
    exit(0);
    }

    struct adc_mode mode = {
    .trigger = ADC_TRIGGER_SOFT,
    .trigger_time = 1000,
    .resolution = 0,
    .sleep_mode = 1,
    .startup_time = 5,
    .sample_time = 8,
    .adc_clock = 8,
    };

    int fd = open(argv[1], O_RDWR);
    if (fd == -1){
    perror("open:");
    exit(-1);
    }

    int data;
    int ret;
    float  tdata=0,a=3.3;
    if (ioctl(fd, ADCCTL_SETMODE, &mode))
        perror("ioctl:ADCCTL_SETMODE");

    memset(&mode, 0, sizeof(struct adc_mode));
    ioctl(fd, ADCCTL_GETMODE, &mode);
    printf("adc_mode:  f => v
"
       "trigger => %d
"
       "trigger_time => %d
"
       "resolution   => %d
"
       "startup_time => %d
"
       "sample_time  => %d
"
       "adc_clock    => %d
",
        mode.trigger, mode.trigger_time,
        mode.resolution, mode.startup_time,
        mode.sample_time, mode.adc_clock);

    while(1)
    {
    usleep(3000000);
    ioctl(fd, ADCCTL_START);
    ioctl(fd, ADCCTL_GETSTATUS, &ret);
    printf("status: 0x%08x
", ret);
    ret = 0;
    //while (1)
//      //ioctl(fd, ADCCTL_GETCNT, &ret);
    //printf("count: %d
", ret);
    //    while (1) {
        ioctl(fd, ADCCTL_GETDATA, &data);
        printf("AD_VAL: %d
", data);
        tdata=(float)data;
        tdata=tdata/1024*a;
        printf("the voltage is %fV
",tdata);
    //    ret--;
//      usleep(200000);
//  }
    }

    close(fd);

    return 0;

}