ts.c

来自「周立功magic2410实验箱源码 第6章Linux高级实验(part1) 」· C语言 代码 · 共 55 行

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>              /* 文件操作 */

#define PEN_UP	        0		/* 触摸笔抬笔，即触摸屏不被压下 */
#define PEN_DOWN		1		/* 触摸笔下笔，即触摸屏被压下 */
#define PEN_FLEETING	2		/* 触摸笔拖动 */

typedef struct {
  unsigned short pressure;		/* 触摸笔动作 */
  unsigned short x;				/* 触点x座标值 */
  unsigned short y;				/* 触点y座标值 */
  unsigned short pad;
}TS_RET;


int main()
{
    int fd,ret,i;
    unsigned char suba;
    TS_RET tsret;
   
	fd = open("/dev/touchscreen/0", O_RDWR);         /* 打开设备 */
    if(fd == -1)
    {
        printf("\nCan't open I2C device!\n");
        exit(-1);
    } 

  	while(1)
  	{
  		ret = read(fd, (char *)&tsret, sizeof(TS_RET));
  		if (ret != sizeof(TS_RET))
  		{
  			printf("read touch screen error!");
  			close(fd);
  			exit(-1);
  		}	
  		else
  		{
  			printf("pressure is: %d\n", tsret.pressure);
  			printf("x is: %d\n", tsret.x);
  			printf("y is: %d\n", tsret.y);
  		}
  	}

	close(fd);  
    return 0;
}

/**************************************************************************
**                            End Of File
**************************************************************************/