在开发板上简单显示一个相册——链表的初级运用
本文是做出一个能够实现把若干bmp格式图片有序显示在GEC6818开发版上的简单代码，由于时间紧俏，代码有些冗余。
main.h文件
#ifndef _MAIN_H
#define _MAIN_H
#include //printf
#include
#include
#include //open，lseek
#include //open
#include //open
#include //lseek，read，close
#include //mmap
#include
#include
typedef struct link_node
{
char data[30];
struct link_node * next;
struct link_node * pre;
}LINK_NODE,*NODE;
int show_bmp(char path[]);
NODE dret();
NODE create_node();
int ADD_NODE(NODE head,char data[]);
int touch();
int touch_s();
#endif
main.c文件
#include "main.h"
int main()
{
char path[10];
NODE Head;
Head = dret();
int ifret = 5;
int tret;
show_bmp("../mn/huany.bmp");
sleep(2);
while(1)
{
show_bmp("../mn/shou.bmp");
ifret = touch();
NODE new_node = Head->next;
if (ifret == 1)
{
while(strlen(new_node->data)!=0)
{
strcpy(path,new_node->data);
new_node = new_node->next;
show_bmp(path);
sleep(1);
}
}
if (ifret == 2)
{
strcpy(path,new_node->data);
show_bmp(path);
while(1)
{
tret = touch_s();
printf("tret=%d\n",tret);
if(tret == 2)
{
new_node = new_node->next;
strcpy(path,new_node->data);
show_bmp(path);
}
if(tret == 1)
{
new_node = new_node->pre;
strcpy(path,new_node->data);
show_bmp(path);
}
if(tret == 0)
printf("fail\n");
if(strlen(new_node->data)== 0)
break;
}
}
if(ifret == 3)
{
show_bmp("../mn/goodbye.bmp");
sleep(1);
break;
}
}
return 0;
}
bmp.c文件
#include "main.h"
int show_bmp(char path[])//显示图片
{
int i;
int ret;
int x, y;
int *lcd_mmap;
int fd_bmp, fd_lcd;
int lcd_buf[800*480];
char bmp_buf[800*480*3];
printf("path is %s\n",path);
char pathm[30];
bzero(pathm,30);
sprintf(pathm,"/projet/pr/%s",path); // ../mn
char pathmm[30];
bzero(pathmm,30);
strcpy(pathmm,pathm);
printf("pathm is %s\n",pathm);
printf("pathmm is %s\n",pathmm);
fd_lcd = open("/dev/fb0", O_RDWR);
if(fd_lcd == -1)
{
printf("open fb0 fail!\n");
return -1;
}
fd_bmp = open(pathm,O_RDWR);
if(fd_bmp == -1)
{
printf("open bmp fail!\n");
return -1;
}
ret = lseek(fd_bmp, 54, SEEK_SET);
if(ret == -1)
{
perror("lseek fail!\n");
return -1;
}
bzero(bmp_buf, sizeof(bmp_buf));
bzero(lcd_buf, sizeof(lcd_buf));
ret = read(fd_bmp, bmp_buf, sizeof(bmp_buf));
if(ret == -1)
{
printf("read bmp fail!\n");
return -1;
}
for(i=0; i<800*480; i++)
{
lcd_buf[i] = bmp_buf[i*3]<<0 | bmp_buf[i*3+1]<<8 | bmp_buf[i*3+2]<<16;
}
lcd_mmap = mmap( NULL,
800*480*4,
PROT_READ|PROT_WRITE,
MAP_SHARED,
fd_lcd,
0);
if(lcd_mmap == MAP_FAILED)
{
printf("mmap fail!\n");
return -1;
}
for(y=0; y<480; y++)
{
for(x=0; x<800; x++)
{
*(lcd_mmap+800*(479-y)+x) = lcd_buf[800*y+x];
}
}
close(fd_bmp);
close(fd_lcd);
munmap(lcd_mmap, 800*480*4);
return 0;
}
NODE create_node()//创建节点
{
NODE node = (NODE)malloc(sizeof(LINK_NODE));
if(node == NULL)
{
return NULL;
}
node->next = node;
node->pre = node;
return node;
}
int ADD_NODE(NODE head,char data[])//添加节点数据
{
NODE add_node = create_node();
if(add_node == NULL)
{
return -1;
}
NODE tmp = head;
while(tmp->next != head)
{
tmp = tmp->next;
}
strcpy(add_node->data ,data);
tmp->next = add_node;
add_node->pre = tmp;
head->pre = add_node;
add_node->next = head;
return 0;
}
NODE dret()//目录检索，检索到就创建节点添加数据
{
char *ret;
char buf[100]="./";
struct dirent *ep;
DIR *fp;
fp = opendir(buf);
if(fp == NULL)
{
perror("open dir failed\n");
}
NODE fnode = create_node();
ret = getcwd(buf,100);
if(ret == NULL)
{
perror("get failed\n");
}
while(1)
{
ep = readdir(fp);
if(ep == NULL)
{
break;
}
if(strcmp(ep->d_name,".") == 0 || strcmp(ep->d_name,"..") == 0)
{
continue;
}
if(strstr(ep->d_name,".bmp"))
{
ADD_NODE(fnode,ep->d_name);
}
}
closedir(fp);
return fnode;
}
int touch()
{
FILE *fp;
fp = fopen("/dev/input/event0","r");
if(fp == NULL)
{
perror("open ts failed\n");
}
int x,y;
struct input_event ts_buf;
bzero(&ts_buf,sizeof(ts_buf));
while(1)
{
fread(&ts_buf, sizeof(ts_buf),1, fp);
if(ts_buf.type == EV_ABS)
{
if(ts_buf.code == ABS_X)
x = ts_buf.value;
if(ts_buf.code == ABS_Y)
y = ts_buf.value;
if(ts_buf.code == ABS_PRESSURE && ts_buf.value == 0)
break;
}
if(ts_buf.type == EV_KEY)
{
if(ts_buf.code == BTN_TOUCH && ts_buf.value == 0)
break;
}
}
if (x>400&&x<580&&y>45&&y<130)
return 1;
if (x>600&&x<787&&y>45&&y<130)
return 2;
if (x>25&&x<120&&y>430&&y<470)
return 3;
fclose(fp);
return 0;
}
int touch_s()
{
int ret;
int ts_x, ts_y;
int fd_ts;
struct input_event coordinate;
fd_ts = open("/dev/input/event0", O_RDWR);
if(fd_ts==-1)
{
printf("open event0 fail!\n");
return -1;
}
int ts_x1 = 0;
int ts_y1 = 0;
int ts_x2 = 0;
int ts_y2 = 0;
while(1)
{
ret = read(fd_ts, &coordinate, sizeof(struct input_event));
if(ret == -1)
{
printf("read bmp fail!\n");
return -1;
}
if(coordinate.type==3 && coordinate.code==0 && coordinate.value>0 && coordinate.value<800)
{
ts_x1 = coordinate.value;
}
if(coordinate.type==3 && coordinate.code==1 && coordinate.value>0 && coordinate.value<480)
{
ts_y1 = coordinate.value;
}
if(coordinate.type==1 && coordinate.code==330 && coordinate.value==1)
{
break;
}
}
while(1)
{
ret = read(fd_ts, &coordinate, sizeof(struct input_event));
if(ret == -1)
{
printf("read bmp fail!\n");
return -1;
}
if(coordinate.type==3 && coordinate.code==0 && coordinate.value>0 && coordinate.value<800)
{
ts_x2 = coordinate.value;
}
if(coordinate.type==3 && coordinate.code==1 && coordinate.value>0 && coordinate.value<480)
{
ts_y2 = coordinate.value;
}
if(coordinate.type==1 && coordinate.code==330 && coordinate.value==0)
{
break;
}
}
printf("(x1, y1):(x2,y2)(%d, %d):(%d, %d)\n", ts_x1, ts_y1,ts_x2, ts_y2);
if (ts_x2>ts_x1)
{
if(((ts_y2-ts_y1)/(ts_x2-ts_x1))<0.6&&((ts_y2-ts_y1)/(ts_x2-ts_x1))>(-0.6))
return 1;
}
else
{
if(((ts_y2-ts_y1)/(ts_x2-ts_x1))<0.6&&((ts_y2-ts_y1)/(ts_x2-ts_x1))>(-0.6))
return 2;
}
close(fd_ts);
return 0;
}