da_test.c

来自「a/d驱动实验与d/a驱动实验 基于清华大学的TEB-44B0实验平台」· C语言 代码 · 共 41 行

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <asm/fcntl.h>

#define DEVICE_FILE_NAME "/dev/da0832"

unsigned char buf[] = {0x00, 0x40, 0x80, 0xc0, 0xff};

int main() 
{
 	int fd, rc;
//	unsigned char value;
	int i;

	fd = open(DEVICE_FILE_NAME, O_RDWR);
	if(fd < 0)
	{
	 printf("Can't open device file: %s!\n", DEVICE_FILE_NAME);
	 exit(1);
	}
	else {
	 printf("Device %s open -> It works!\n", DEVICE_FILE_NAME);
	// isTSopen = 1;
	}
	
	//while(isTSopen)
	//{
	 for(i = 0; i < sizeof(buf); i++)
	 {
	  printf("DA convert value[%d] = 0x%02x\n", i, buf[i]);
	  rc = ioctl(fd, 0, &buf[i]);
//	  rc = ioctl(fd, 0, buf[i]);
	  printf("ioctl return value %d\n", rc);
	  sleep(5);
	 }	 
	//}
	close(fd);
	return 0;
}