#include <linux/delay.h>#include <sys/types.h>#include <linux/fb.h>#include <stdio.h>#include <unistd.h>#include <fcntl.h>#include <sys/mman.h>#include "mathf.h"typedef struct {	unsigned short pressure;  	unsigned short x;	unsigned short y;} TS_RET;char * device = "/dev/touchscreen/0raw";int screen_fd;int main(int argc, char *argv[]){    char *fbp = 0;     TS_RET cBuffer; //test    struct fb_var_screeninfo vinfo;    struct fb_fix_screeninfo finfo;    int i;    int fbfd = 0;    long int screensize = 0;    int x = 0, y = 0,z=0;    fbfd = open("/dev/fb0", O_RDWR);    if (fbfd < 0) {        printf("Error: cannot open framebuffer device.\n");        exit(1);    }    printf("The framebuffer device was opened successfully.\n");    // Get fixed screen information    if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {        printf("Error reading fixed information.\n");        exit(2);    }    // Get variable screen information    if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {        printf("Error reading variable information.\n");        exit(3);    }    printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel );    // Figure out the size of the screen in bytes    screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;    // Map the device to memory    fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,                       fbfd, 0);    if ((int)fbp == -1) {        printf("Error: failed to map framebuffer device to memory.\n");        exit(4);    }    printf("The framebuffer device was mapped to memory successfully.\n");    // Figure out where in memory to put the pixel        memset(fbp, 0xFF,screensize);        for ( y = 0; y < vinfo.yres; y+=10 )        for ( x = 0; x < vinfo.xres; x++ )          	*((unsigned short int*)(fbp + y*vinfo.xres*2+x*2)) = 0xF800;    for ( y = 0; y < vinfo.yres; y++ )        for ( x = 0; x < vinfo.xres; x+=10 )          	*((unsigned short int*)(fbp + y*vinfo.xres*2+x*2)) = 0xF800;                 screen_fd = open(device, O_RDONLY);        if (screen_fd == -1) {              printf("Unable to open touch screen");                exit(0);        }	while(1){		read(screen_fd,&cBuffer,sizeof(TS_RET));		if(cBuffer.pressure)			printf("x=%d,y=%d\n",cBuffer.x,cBuffer.y);		usleep(1000000);	}}