test_ad.c

来自「基于ＬＩＮＵＸ嵌入式系统」· C语言 代码 · 共 30 行

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>

int main(void)
{
	int fd ,ret;
	unsigned int data;

	fd = open("/dev/adc0.0", O_RDONLY);
	if (fd == -1) {
		printf(" Can't open adc0.0 ! \n");
		exit(1);
	}

	while(1) {
		data = 0;

		ret = read(fd, &data, sizeof(data));

		printf("ret is < %d > \n", ret);
		printf("the U is [ %d v]  \n", data);
		printf("the U is [ %f v]  \n", data * 3.3 / 1024);

		sleep(2);
	}
}