承接第六天：zigbee无线传感网实训---完成开发板WiFi（The Sixth day）
一、制作mp3解码库
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1、制作zlib库
拷贝zlib-1.2.8.tar.gz文件到家目录
cd ~解压
tar xzvf zlib-1.2.8.tar.gz //“/home/gec/”配置zlib
mkdir /home/gec/audio
export CC=arm-none-linux-gnueabi-gcc
export AR=arm-none-linux-gnueabi-ar
export RANLIB=arm-none-linux-gnueabi-ranlib
cd /home/gec/zlib-1.2.8
./configure --prefix=/home/gec/audio编译
make安装
make install----------------------------------
2、制作libid3tag
解压：
tar xzvf libid3tag-0.15.1b.tar.gz -C ~配置：
./configure --prefix=/home/gec/audio \
--host=arm-none-linux-gnueabi
出错1：
configure: error: zlib.h was not found
*** You must first install zlib (libz) before you can build this package.
*** If zlib is already installed, you may need to use the CPPFLAGS
*** environment variable to specify its installed location, e.g. -I<dir>.
解决：
指明头文件路径：
./configure --prefix=/home/gec/audio \
--host=arm-none-linux-gnueabi \
CPPFLAGS=-I/home/gec/audio/include
出错2：
configure: error: libz was not found
*** You must first install zlib (libz) before you can build this package.
*** If zlib is already installed, you may need to use the LDFLAGS
*** environment variable to specify its installed location, e.g. -L<dir>.
解决2：
指明库文件路径：
./configure --prefix=/home/gec/audio \
--host=arm-none-linux-gnueabi \
CPPFLAGS=-I/home/gec/audio/include \
LDFLAGS=-L/home/gec/audio/lib编译
make安装
make install-----------------------------------------------------------
3、制作libmad
解压：
tar xzvf libmad-0.15.1b.tar.gz -C ~
cd /home/gec/libmad-0.15.1b 配置：
./configure --prefix=/home/gec/audio \
--host=arm-none-linux-gnueabi
编译：
make
出错：
arm-none-linux-gnueabi-gcc.br_real: error: unrecognized command line option '-fforce-mem'
Makefile:383: recipe for target 'version.lo' failed
make[2]: *** [version.lo] Error 1
make[2]: Leaving directory '/home/gec/libmad-0.15.1b'
Makefile:424: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/gec/libmad-0.15.1b'
Makefile:249: recipe for target 'all' failed
make: *** [all] Error 2
解决：
更改Makefile文件在129行删除'-fforce-mem'
vi Makefile 按下i进入插入模式删除'-fforce-mem'
再make安装：
make install-----------------------------------------------------------------------
4、制作madplay
解压：
tar xzvf madplay-0.15.2b.tar.gz -C ~
cd /home/gec/madplay-0.15.2b 配置：
./configure --prefix=/home/gec/audio \
--host=arm-none-linux-gnueabi \
CPPFLAGS=-I/home/gec/audio/include \
LDFLAGS=-L/home/gec/audio/lib编译：
make安装：
make install---------------------------------------------------------------------
5、移植madplay到开发板
拷贝madpla到共享文件夹
cp /home/gec/audio/bin/madplay /mnt/hgfs/code下载到开发板
tftp -g 192.168.1.147 -r madpla
chmod 777 madpla
./madpla ---------------------------------------------------------------------
6、运行madplay
./madpla ***.mp3 //歌曲需下载到开发板
若出错提示缺少“***.so”文件
解决：
将/home/gec/audio里面的lib压缩打包下载到开发板后解压然后设置换件变量指明库文件路径即可
具体方法可参照jpeg解码库的移植
===========================================================================
二、给系统发送命令
#include <stdlib.h>
int system(const char *command);
command：你要发送的命令
挂载额外内存
cat /proc/partitions
[root@GEC6818 /]#cat /proc/partitions
major minor #blocks name
179 0 7634944 mmcblk0
179 1 65536 mmcblk0p1
179 2 772096 mmcblk0p2
179 3 438272 mmcblk0p3
179 4 1 mmcblk0p4
179 5 8192 mmcblk0p5
179 6 22528 mmcblk0p6
179 7 6324224 mmcblk0p7 ----->没有使用
179 16 4096 mmcblk0boot1
179 8 4096 mmcblk0boot0 格式化未使用的分区mmcblk0p7
mkfs.vfat /dev/mmcblk0p7
使用mount命令挂载该分区
cd /
mkdir ***
mount -t vfat /dev/mmcblk0p7 /***
---------------------------------------------------------------------
实现LCD开发板播放音乐并切换歌曲
music_touch.h
#ifndef __TOUCH_H_
#define __TOUCH_H_
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <strings.h>
#include <linux/input.h>
struct get_abs_xy
{
int x;
int y;
int ts;
};
int init_touch(void);
void get_xy(struct get_abs_xy *p);
#endifmusic_touch.c
#include "music_touch.h"
int init_touch(void)
{
//打开触摸屏
int ts = open("/dev/input/event0", O_RDONLY);
if(ts == -1)
{
perror("打开触摸屏失败：");
exit(0);
}
return ts;
}
void get_xy(struct get_abs_xy *p)
{
struct input_event myevent;
bzero(&myevent, sizeof(myevent));
bool x_flag = false;
bool y_flag = true;
while(1)
{
read(p->ts, &myevent, sizeof(myevent));
if(myevent.type == EV_ABS)
{
if(myevent.code==ABS_X && x_flag==false && y_flag == true)
{
p->x = myevent.value;
x_flag = true;
y_flag = false;
}
if(myevent.code==ABS_Y && x_flag == true && y_flag == false)
{
p->y = myevent.value;
x_flag = false;
y_flag = true;
}
printf("X: %d Y:%d\n", p->x, p->y);
if(myevent.code==ABS_PRESSURE && myevent.value==0)
break;
}
if(myevent.type==EV_KEY && myevent.code==BTN_TOUCH && myevent.value==0)
break;
}
return ;
}play_mp3.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include "music_touch.h"
int main()
{
char buf[80];
int vol = -30;
struct get_abs_xy *touch = calloc(1, sizeof(struct get_abs_xy));
touch->ts = init_touch();
char *music_pathname[] = {"/aaa/SeeYouAgain.mp3",
"/aaa/KLL.mp3",
"/aaa/WHYS.mp3"};
int s=0;
int lcd = open("/dev/fb0", O_RDWR);
if(lcd == -1)
{
perror("打开LCD失败");
exit(0);
}
// 2, 映射一块恰当大小的内存
char *p = mmap(NULL, // 不指定映射内存的位置，让系统自动选取
800*480*4, // 映射内存的大小
PROT_READ | PROT_WRITE, // 以读、写模式操作映射内存
MAP_SHARED, // 其他线程、进程可以共享访问这块内存
lcd, // LCD文件描述符
0 // 映射内存与LCD的偏移量，0代表完全重合
);
int bmp = open("beijing1.bmp", O_RDONLY);
if(bmp == -1)
{
perror("打开图片失败！");
close(lcd);
munmap(p, 800*480*4);
exit(0);
}
char bmp_buf[800*480*3];
lseek(bmp, 54, SEEK_SET);
int ret = read(bmp, bmp_buf, sizeof(bmp_buf));
if(ret <= 0)
{
perror("读取bmp数据失败！");
close(lcd);
close(bmp);
munmap(p, 800*480*4);
exit(0);
}
int lcd_buf[800*480];
// 4, 铺满整个映射内存
for(int i=0; i<800*480; i++)
{
lcd_buf[i]=bmp_buf[i*3] | bmp_buf[i*3+1]<<8 | bmp_buf[i*3+2]<<16;
}
for(int y=0; y<480; y++)
{
for(int x=0; x<800; x++)
{
memcpy(p+4*x+800*4*y, &lcd_buf[x+(479-y)*800], 4);
}
}
// 5, 释放资源
munmap(p, 800*480*4);
close(lcd);
while(1)
{
get_xy(touch);
printf("X: %d Y:%d\n", touch->x, touch->y);
if(touch->x>266 && touch->x<400 && touch->y>320 && touch->y<480)
{
touch->x=0;
touch->y=0;
system("killall -KILL madplay");
printf("已暂停\n");
}
if(touch->x>400 && touch->x<533 && touch->y>320 && touch->y<480)
{
touch->x=0;
touch->y=0;
bzero(buf, sizeof(buf));
sprintf(buf, "/aaa/madplay %s -a %d &", music_pathname[s%3], vol);
printf("/aaa/madplay %s -a %d\n", music_pathname[s%3], vol);
system(buf);
}
if(touch->x>0 && touch->x<133 && touch->y>320 && touch->y<480)
{
touch->x=0;
touch->y=0;
bzero(buf, sizeof(buf));
system("killall -KILL madplay");
if((s-1<0))
{
s=3;
}
sprintf(buf, "/aaa/madplay %s -a %d &", music_pathname[(s-1)%3], vol);
printf("/aaa/madplay %s -a %d\n",music_pathname[(s-1)%3], vol);
system(buf);
printf("上一首\n");
s--;
}
//下一首
if(touch->x>666 && touch->x<800 && touch->y>320 && touch->y<480)
{
touch->x=0;
touch->y=0;
bzero(buf, sizeof(buf));
system("killall -KILL madplay");
sprintf(buf, "/aaa/madplay %s -a %d &", music_pathname[(s+1)%3], vol);
printf("/aaa/madplay %s -a %d\n",music_pathname[(s+1)%3], vol);
system(buf);
printf("下一首\n");
s++;
}
//加声音
if(touch->x>533 && touch->x<666 && touch->y>320 && touch->y<480)
{
touch->x=0;
touch->y=0;
vol +=5;
printf("当前音量为： %d\n",vol);
}
//减声音
if(touch->x>133 && touch->x<266 && touch->y>320 && touch->y<480)
{
touch->x=0;
touch->y=0;
vol -=5;
printf("当前音量为： %d\n",vol);
}
}
} 编译：
虚拟机：
arm-none-linux-gnueabi-gcc *.c -o play_mp3lcd开发板
tftp -g 192.168.1.147 -r play_mp3
chmod 777 play_mp3
./play_mp3结果：
