第一篇：浙工大 嵌入式實(shí)驗(yàn)報(bào)告

金艷霞

通信2班

201203110210

實(shí)驗(yàn)五 Linux交叉編譯平臺(tái)

一、實(shí)驗(yàn)?zāi)康?/p>

1.掌握一些基本的linux讀寫(xiě)操作 2.利用vcc編譯c程序

3.通過(guò)nfs掛載到實(shí)驗(yàn)箱中，利用交叉編譯執(zhí)行文件

二．實(shí)驗(yàn)設(shè)備

1.Arm9試驗(yàn)箱 2.Pc機(jī)

3.Linux系統(tǒng)服務(wù)器

三．實(shí)驗(yàn)過(guò)程及實(shí)驗(yàn)結(jié)果 1.連接電腦箱

2.設(shè)置交叉編譯環(huán)境 啟動(dòng)putty.exe 登陸192.168.1.116

3.添加軟件包至實(shí)驗(yàn)?zāi)夸洠?① [shiyan@localhost ~]$ cd /home/shiyan ② [shiyan@localhost ~]$ tar –zxvf arm-linux-gcc-3.4.4-glib-2.3.5-static.tar.gz tar-zxvf arm-linux-gcc-3.4.4-glib-2.3.5-static.tar.gz ③ [shiyan@localhost201203110210] $export PATH=$PATH:/home/shiyan/201203110210/opt/crosstool/arm-linux/gcc-3.4.4-glib-2.3.5/arm-linux/bin ④ [shiyan@localhost 201203110210]$ set OSTYPE=linux-gnu PATH=/usr/lib/qt-3.3/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/shiyan/bin:/home/shiyan/opt/crosstool/arm-linux/gcc-3.4.4-glibc-2.3.5/arm-linux/bin:/home/shiyan/opt/crosstool/arm-linux/gcc-3.4.4-glibc-2.3.5/arm-linux/bin:/home/shiyan/opt/crosstool/arm-linux/gcc-3.4.4-glibc-2.3.5/arm-linux/bin 可以看出路徑已添加 ⑤ [shiyan@localhost 201203110210]$ arm-linux-g再按tab arm-linux-g++

arm-linux-gcc

arm-linux-gcc-3.4.4 arm-linux-gccbug

arm-linux-gcov ⑥ [shiyan@localhost 201203110210]$ arm-linux-gcc arm-linux-gcc: no input files 此時(shí)出錯(cuò)，無(wú)此文件 3.測(cè)試程序 ① 創(chuàng)建hello.c [shiyan@localhost ~]$ vi hello.c #include int main(){ printf(“jin123”);return 0;}

：wq ② 查看是否生成文件

[shiyan@matrix 201203110210]$ ls arm-linux-gcc-3.4.4-glib-2.3.5-static.tar.gz hello.c 已經(jīng)生成 ③ 打開(kāi)hello.c [shiyan@localhost ~]$./hello.c-bash:/hello cannot execute binary file 表示無(wú)法在服務(wù)器上執(zhí)行 ④ 交叉編譯hello.c [shiyan@localhost ~]$ arm-linux-gcc-o hello hello.c ⑤ 將文件拷貝到nfs下

[shiyan@localhost ~]$ cp hello /home/shiyan/nfs ⑥ 掛載服務(wù)器到板子上

/ $ mount –tnfs-o nolock 192.168.1.116:/home/shiyan/nfs/mnt/nfs / $cdmnt/nfs ⑦ 打開(kāi)hello文件 / $./hello

結(jié)果輸出: Jin 123

四．實(shí)驗(yàn)總結(jié)

上述實(shí)驗(yàn)可以得出，交叉編譯的二進(jìn)制可以在板子上運(yùn)行，卻不能在服務(wù)器上運(yùn)行，很好的認(rèn)清了交叉編譯的意義和功能。

實(shí)驗(yàn)六Armboot下載運(yùn)行及tcp實(shí)驗(yàn)

一．實(shí)驗(yàn)?zāi)康?/p>

1.掌握armboot的編譯 2.掌握tftp工具的使用 3.掌握armboot下載運(yùn)行

4.掌握windows的 tcp客戶端的建立及通信過(guò)程 5.掌握tcp的基本原理

二．實(shí)驗(yàn)設(shè)備

1.Arm9試驗(yàn)箱 2.Pc機(jī)

3.Linux系統(tǒng)服務(wù)器

三．實(shí)驗(yàn)過(guò)程及實(shí)驗(yàn)結(jié)果 1)Armboot

① 編譯armboot-1.1.0 cd /home/shiyan/arm-linux-2.6/armboot-1.1.0 [shiyan@matrix armboot-1.1.0]$ make

② 產(chǎn)生的armboot.bin拷貝到tftp的目錄服務(wù)下

[shiyan@matrixarmboot-1.1.0]$ cparmboot.bin /home/shiyan/arm-linux-2.6/armboot-1.1.0/tftpboot/armboot ③ 打開(kāi)arm9開(kāi)發(fā)板，在五秒內(nèi)按ESC，檢查網(wǎng)絡(luò)環(huán)境

CPE>printenv bootdelay=3 baudrate=38400 ethaddr=00:40:25:00:00:01 netmask=255.255.255.0 sererip=192.168.1.65 ipaddr=192.168.1.111 serverip=192.168.1.30

Environment size: 139/131068 bytes ④ 將armboot的網(wǎng)絡(luò)環(huán)境改為tftp服務(wù)的網(wǎng)絡(luò)地址

setenv serverip 192.168.1.220 CPE>saveenv Un-Protected 1 sectors Erasing sector 6...ok.0x800e0000

o Flash...done.Protected 1 sectors

⑤ 將armboot.bin文件通過(guò)tftp傳輸?shù)絻?nèi)存0x2000000H中

CPE>tftp 0x2000000 armboot.bin ARP broadcast 1 ARP broadcast 2

⑥ 運(yùn)行

go 0x2000000

⑦ 檢查網(wǎng)絡(luò)環(huán)境

CPE> printenv bootdelay=3 baudrate=38400 ethaddr=00:40:25:00:00:01 netmask=255.255.255.0 sererip=192.168.1.65 ipaddr=192.168.1.111 serverip=192.168.1.220

通過(guò)serverip的改變可看出armboot下載的正確性。

實(shí)驗(yàn)七 Mount掛載實(shí)驗(yàn)

一．實(shí)驗(yàn)?zāi)康?1.掌握一些基本的linux讀寫(xiě)操作（touch指令）2.掌握Usb掛載方法 3.掌握配置nfs的方法

二．實(shí)驗(yàn)設(shè)備

1.2.3.4.Arm9試驗(yàn)箱 Pc機(jī)

Linux系統(tǒng)服務(wù)器 U盤(pán)

三．實(shí)驗(yàn)過(guò)程及實(shí)驗(yàn)結(jié)果 A.文件夾掛載 1.服務(wù)器

[shiyan@matrix ~]$/etc/rc.d/init.d/nfs start 2.板子掛載

/ $ ifconfig eth0 192.168.1.98 / $ mount-t nfs-o nolock 192.168.1.220:/home/shiyan/nfs/mnt/nfs /$ df Filesystem

1k-blocks

Used Available Use% Mounted on /dev/mtdblock1

1024

544

480 53% /mnt/mtd 192.168.1.220:/home/shiyan/nfs 515455456 59590720 429681056 12% /mnt/nfs B.Usb 掛載

① 將u盤(pán)插入arm9開(kāi)發(fā)板，并啟動(dòng) ② 查看盤(pán)符信息

/ $ fdisk-l

③ 創(chuàng)建一個(gè)/mnt/usb文件夾

/ $ mkdir /mnt/usb ④ 把sda1盤(pán)符mount到/mnt/usb文件上

/ $ mount /dev/sda1 /mnt/usb/ / $ cd /mnt/usb /mnt/usb $ ls

⑤ 創(chuàng)建文件，并輸入字符串

/mnt/usb $ vi jin.txt

hello!

⑥ 解掛載

/mnt/usb $ unmount /mnt/usb/ /bin/sh: unmount: not found ⑦ 將u盤(pán)拔出，插入電腦，觀察該文件

結(jié)果正確

實(shí)驗(yàn)八RTC時(shí)鐘驅(qū)動(dòng)實(shí)驗(yàn)

一．實(shí)驗(yàn)?zāi)康?/p>

1.了解RTC工作原理 2.掌握RTC時(shí)鐘驅(qū)動(dòng)編程

二．實(shí)驗(yàn)內(nèi)容

1.編寫(xiě)RTC驅(qū)動(dòng)程序

2.通過(guò)insmod加載驅(qū)動(dòng)程序 3.編寫(xiě)代碼修改RTC內(nèi)部時(shí)間

三．實(shí)驗(yàn)設(shè)備

1.PC機(jī)

2.Arm9實(shí)驗(yàn)箱客戶端 3.Linux操作系統(tǒng)服務(wù)端

四．實(shí)驗(yàn)過(guò)程及結(jié)果

1.實(shí)驗(yàn)代碼

#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRIVER_VERSION

“0.01” /* Register map */ /* rtc section */ // control and status registers #define REG_CS1 0x00

#define TEST1

(1<<7)

// 0-normal mode, must be set to logic 0 during normal operations;1-EXT_CLK test mode #define STOP

(1<<5)

// 0-RTC source clock runs;1-the RTC clock is stopped(CLKOUT at 32.768KHz is still available)#define TESTC

(1<<3)

// 0-power-on reset(POR)override facility is disable;set to logic 0 for normal operation;1-POR override may be enable #define REG_CS2 0x01 #define TI_TP

(1<<4)

// 0-int is active when TF is active(subject to the status of TIE)#define AF

(1<<3)#define TF

(1<<2)#define AIE

(1<<1)#define TIE

(1<<0)

// Time and date registers #define REG_SC 0x02

// vl_seconds(0-59)#define REG_MN 0x03

// minutes(0-59)#define REG_HR 0x04

// hours(0-23)#define REG_DT 0x05

// days(1-31)#define REG_DW 0x06

// weekdays(0-6)#define REG_MO 0x07

// century_months(1-12)#define REG_YR 0x08

// years(0-99)

// Alarm registers #define REG_MA 0x09

// minute_alarm #define AE_M

(1<<7)#define REG_HA 0x0a

// hour_alarm #define AE_H

(1<<7)#define REG_DA 0x0b

// day_alarm #define AE_D

(1<<7)#define REG_WA 0x0c

// weekday_alarm #define AE_W

(1<<7)// CLKOUT control register #define REG_CC 0x0d #define FE

(1<<7)// Timer registers #define REG_TC 0x0e

// timer_control #define TE

(1<<7)#define REG_TMR 0x0f

// timer #define RTC_SECTION_LEN

/* i2c configuration */ #define I2C_ADDR

0xa2 ///////////////////////////////////////////////////////////// #define DEFAULT_I2C_CLOCKDIV

180//for APB 108MHz staticunsignedlong rtc_status;staticvolatileunsignedlong rtc_irq_data;staticunsignedlong rtc_freq = 1;/*FTRTC010 supports only 1Hz clock*/ staticstruct fasync_struct *rtc_async_queue;static DECLARE_WAIT_QUEUE_HEAD(rtc_wait);extern spinlock_t rtc_lock;MODULE_AUTHOR(“GM Corp.”);MODULE_LICENSE(“GM License”);externint GM_i2c_xfer(struct i2c_msg *msgs, int num, int clockdiv);/* block read */ staticint i2c_read_regs(u8 reg, u8 buf[], unsigned len){ struct i2c_msg msgs[1];//////////////

buf[0] = reg;

msgs[0].addr = I2C_ADDR>>1;

msgs[0].flags = 0;

msgs[0].len = 1;

msgs[0].buf = buf;

if(GM_i2c_xfer(msgs, 1, DEFAULT_I2C_CLOCKDIV)!= 1)return-1;//////////////

msgs[0].addr = I2C_ADDR>>1;

msgs[0].flags = 1;

msgs[0].len = len+1;

msgs[0].buf = buf;

if(GM_i2c_xfer(msgs, 1, DEFAULT_I2C_CLOCKDIV)!= 1)return-1;return 0;} /* block write */ staticint i2c_set_regs(u8 reg, u8 const buf[], unsigned len){

u8 i2c_buf[10];struct i2c_msg msgs[1];

i2c_buf[0] = reg;

memcpy(&i2c_buf[1], &buf[0], len);

msgs[0].addr = I2C_ADDR>>1;

msgs[0].flags = 0;

msgs[0].len = len+1;

msgs[0].buf = i2c_buf;

if(GM_i2c_xfer(msgs, 1, DEFAULT_I2C_CLOCKDIV)!= 1)return-1;return 0;} staticint set_time(struct rtc_time const *tm){ int sr;

u8 regs[RTC_SECTION_LEN] = { 0, };

printk(“stop RTCn”);

regs[0] = STOP;

regs[1] = 0x00;

// disable interrupt and clear all flags

sr = i2c_set_regs(REG_CS1, regs, 2);if(sr < 0){

// write control and status registers

printk(“%s: stop RTC failedn”, __func__);return sr;

}

printk(“set_time Date(y/m/d):%d/%d/%d Time(h/m/s):%d/%d/%dn”,tm->tm_year,tm->tm_mon,tm->tm_mday,tm->tm_hour,tm->tm_min,tm->tm_sec);

regs[REG_SC-REG_SC] = BIN2BCD(tm->tm_sec);

regs[REG_MN-REG_SC] = BIN2BCD(tm->tm_min);

regs[REG_HR-REG_SC] = BIN2BCD(tm->tm_hour);

regs[REG_DT-REG_SC] = BIN2BCD(tm->tm_mday);

regs[REG_MO-REG_SC] = BIN2BCD(tm->tm_mon);

regs[REG_YR-REG_SC] = BIN2BCD(tm->tm_year-100);

regs[REG_DW-REG_SC] = BIN2BCD(tm->tm_wday & 7);/* write RTC registers */

sr = i2c_set_regs(REG_SC, regs, RTC_SECTION_LEN);if(sr < 0){

printk(“%s: writing RTC section failedn”, __func__);return sr;

}

printk(“start RTCn”);

regs[0] = 0x00;

sr = i2c_set_regs(REG_CS1, regs, 1);if(sr < 0){

// write control and status registers

printk(“%s: start RTC failedn”, __func__);return sr;

}

return 0;

} staticvoid read_time(struct rtc_time *tm){ int sr;

u8 regs[RTC_SECTION_LEN] = { 0, };

sr = i2c_read_regs(REG_SC, regs, RTC_SECTION_LEN);if(sr < 0){

printk(“%s: reading RTC section failedn”, __func__);return;

}

tm->tm_sec = BCD2BIN(regs[REG_SC-REG_SC]&0x7f);

tm->tm_min = BCD2BIN(regs[REG_MN-REG_SC]&0x7f);

tm->tm_hour = BCD2BIN(regs[REG_HR-REG_SC]&0x3f);

tm->tm_mday = BCD2BIN(regs[REG_DT-REG_SC]&0x3f);

tm->tm_wday = BCD2BIN(regs[REG_DW-REG_SC]&0x07);

tm->tm_mon = BCD2BIN(regs[REG_MO-REG_SC]&0x1f);/* rtc starts at 1 */

tm->tm_year = BCD2BIN(regs[REG_YR-REG_SC])+100;

printk(“read_time Date(YY/MM/DD):%d/%d/%d Time(hh/mm/ss):%d/%d/%dn”,tm->tm_year,tm->tm_mon,tm->tm_mday,tm->tm_hour,tm->tm_min,tm->tm_sec);} staticunsigned AIE_stat=0;/*ijsung: arch-indep function*/ staticint rtc_open(struct inode *inode, struct file *file){ if(test_and_set_bit(1, &rtc_status))return-EBUSY;

rtc_irq_data = 0;return 0;} staticint rtc_release(struct inode *inode, struct file *file){ unsignedchar buf[7];

rtc_status = 0;return 0;} staticint rtc_fasync(int fd, struct file *filp, int on){ return fasync_helper(fd, filp, on, &rtc_async_queue);} staticunsignedint rtc_poll(struct file *file, poll_table *wait){

poll_wait(file, &rtc_wait, wait);return(rtc_irq_data)? 0 : POLLIN | POLLRDNORM;} static loff_t rtc_llseek(struct file *file, loff_t offset, int origin){ return-ESPIPE;} ssize_t rtc_read(struct file *file, char *buf, size_t count, loff_t *ppos){

DECLARE_WAITQUEUE(wait, current);unsignedlong data;

ssize_t retval;if(count

add_wait_queue(&rtc_wait, &wait);

set_current_state(TASK_INTERRUPTIBLE);for(;;){

spin_lock_irq(&rtc_lock);

data = rtc_irq_data;if(data!= 0){

rtc_irq_data = 0;break;

}

spin_unlock_irq(&rtc_lock);if(file->f_flags & O_NONBLOCK){

retval =-EAGAIN;goto out;

} if(signal_pending(current)){

retval =-ERESTARTSYS;goto out;

}

schedule();

}

spin_unlock_irq(&rtc_lock);

data-= 0x100;/* the first IRQ wasn't actually missed */

retval = put_user(data,(unsignedlong *)buf);if(!retval)

retval = sizeof(unsignedlong);out:

set_current_state(TASK_RUNNING);

remove_wait_queue(&rtc_wait, &wait);return retval;} staticint rtc_ioctl(struct inode *inode, struct file *file, unsignedint cmd, unsignedlong arg){ struct rtc_time tm, tm2;unsignedchar buf[7];switch(cmd){ case RTC_AIE_OFF:

printk(“Not Supportn”);return 0;case RTC_AIE_ON:

printk(“Not Supportn”);return 0;case RTC_ALM_READ:

printk(“Not Supportn”);return 0;case RTC_ALM_SET:

printk(“Not Supportn”);return 0;case RTC_RD_TIME:

read_time(&tm);break;

case RTC_SET_TIME:

{ unsigned usertime;unsignedchar buf[7];if(!capable(CAP_SYS_TIME))return-EACCES;if(copy_from_user(&tm,(struct rtc_time*)arg, sizeof(tm)))return-EFAULT;

set_time(&tm);

} return 0;case RTC_IRQP_READ: return put_user(rtc_freq,(unsignedlong *)arg);case RTC_IRQP_SET: if(arg!= 1)return-EINVAL;return 0;case RTC_EPOCH_READ: return put_user(1970,(unsignedlong *)arg);default: return-EINVAL;

} return copy_to_user((void *)arg, &tm, sizeof(tm))?-EFAULT : 0;} staticstruct file_operations rtc_fops = {

owner:

THIS_MODULE，llseek:

rtc_llseek，read:

rtc_read，poll:

rtc_poll，ioctl:

rtc_ioctl，open:

rtc_open，release: rtc_release，fasync:

rtc_fasync, };staticstruct miscdevice ftrtc010rtc_miscdev = {

RTC_MINOR，“rtc”, &rtc_fops };staticint rtc_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data){ // unsigned alarm_time;unsignedchar buf[7];

char *p = page;int len;struct rtc_time tm;

read_time(&tm);//printk(“RTC...%dn”,xtime.tv_sec);

p += sprintf(p, “rtc_timet: %02d:%02d:%02dn”

“rtc_datet: %04d-%02d-%02dn”

“rtc_epocht: %04dn”，tm.tm_hour + 1, tm.tm_min, tm.tm_sec，tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 2000);// read_alarm(&tm);// p += sprintf(p, “alrm_timet: %2dth day of week dayn” //

“alrm_datet: N/A for Platformn”, //

tm.tm_wday);

p += sprintf(p, “alrm_timet: Not Supportn”

“alrm_datet: Not Supportn”);

p += sprintf(p, “alarm_IRQt: %sn”, AIE_stat ? “yes” : “no”);

len =(poff;if(len < 0)

len = 0;

*eof =(len <= count)? 1 : 0;

*start = page + off;return len;} staticint __init rtc_init(void){

misc_register(&ftrtc010rtc_miscdev);

create_proc_read_entry(“driver/rtc”, 0, 0, rtc_read_proc, NULL);

printk(“PCF8563 Real Time Clock drivern”);return 0;} staticvoid __exit rtc_exit(void){

remove_proc_entry(“driver/rtc”, NULL);

misc_deregister(&ftrtc010rtc_miscdev);} module_init(rtc_init);module_exit(rtc_exit);

2.掛載usb / $ ifconfig eth0 192.168.1.99 / $ mount-t nfs-o nolock 192.168.1.220:/home/shiyan/nfs /mnt/nfs / $ fdisk –l / $ mkdir /mnt/usb / $ mount /dev/sda1 /mnt/usb/ / $ cd /mnt/usb

3.找到u盤(pán)中的pcf8563.ko /mnt/usb $ ls

4.加載pcf8563.ko /mnt/usb $ insmod pcf8563.ko

5.更改日期并寫(xiě)入

6.重啟檢驗(yàn)日期

與當(dāng)前時(shí)間相符

實(shí)驗(yàn)九視頻采集RTP發(fā)送及遠(yuǎn)程視頻監(jiān)控實(shí)驗(yàn)

一．實(shí)驗(yàn)?zāi)康?1.理解視頻傳輸原理

2.掌握在IP網(wǎng)絡(luò)中實(shí)現(xiàn)視頻傳輸?shù)姆椒?3.理解遠(yuǎn)程控制原理

4.掌握在windows下TCP客戶端建立及通信過(guò)程

二．實(shí)驗(yàn)內(nèi)容

1.搭建點(diǎn)對(duì)點(diǎn)視頻傳輸模式 2.開(kāi)啟視頻采集

3.開(kāi)啟Windows下tcp客戶端，完成控制命令

三．實(shí)驗(yàn)設(shè)備

1.硬件：基于雙核處理器架構(gòu)的網(wǎng)絡(luò)音視頻傳輸教學(xué)實(shí)驗(yàn)系統(tǒng)；

對(duì)接線； 串口連接線； 網(wǎng)線；

集線器（HUB），PC機(jī)；

2.軟件：H.264流媒體軟件

設(shè)備端視頻采集程序 設(shè)備端視頻傳輸程序 串口操作軟件

四．實(shí)驗(yàn)步驟及結(jié)果 A.視頻采集

1.連接好實(shí)驗(yàn)箱，打開(kāi)串口通信端，遠(yuǎn)程mount到home/nfs文件夾 / $ mount-t nfs-o nolock 192.168.1.116:/home/shiyan/nfs /mnt/nfs 2.掛載服務(wù)器下nfs與板子的/mnt/nfs，進(jìn)入/mnt/nfs文件夾 / $ cd /mnt/nfs 3.輸入ls命令，目錄下文件 /mnt/nfs $ ls 123321

clientxxww

readme

tcpserver StartLog0

ffgpio.ko

server

tcpserver19 a

gpio_test

serverfxf

tcpserver_arm_11 bo

hello

serverxw

tcpserver_hdt client

nfs1

tcpclient

tcpserver_zn client_arm

ok

tcpclient19

tcpsever client_arm_17

program_20_1.c

tcpclient_29

tw2835_menu client_arm_st20

program_20_2.c

tcpclient_arm_11 xianshi client_dalan

programyk

tcpclient_hdt

yk clientxw

programyq

tcpclient_zn

yq 4.運(yùn)行tw2835_menu進(jìn)行視頻采集 /mnt/nfs $./tw2835_menu&

5.進(jìn)入掛載目錄并查看文件 /mnt/nfs $ cd nfs1 /mnt/nfs/nfs1 $ ls dev_app.app

hello

vedio.confTCPS1

dev_app3

ffgpio.ko

tw2835_menu dev_app

gpio_test

tw2835_pic 6.運(yùn)行dev_app到板子IP192.168.1.9 /mnt/nfs/nfs1 $./dev_app 192.168.1.9 7.開(kāi)啟H.264流媒體播放器進(jìn)行視頻接受 a)用解碼器解碼，并允許注冊(cè).bat

b)打開(kāi)H.264流媒體播放器，點(diǎn)擊開(kāi)啟視頻接收

B.遠(yuǎn)程視頻監(jiān)控

1.重復(fù)以上實(shí)驗(yàn)1~4步

2.進(jìn)入已掛載目錄/mnt/nfs/nfs1，看到多個(gè)程序 /mnt/nfs $ cd nfs1 /mnt/nfs/nfs1 $ ls StartLog0

dev_app.app

hello

vedio.conf TCPS1

dev_app3

image.info

www boot.sh

ffgpio.ko

tw2835_menu 3.運(yùn)行TCPS1 /mnt/nfs/nfs1 $./ TCPS1 4.程序進(jìn)入等待狀態(tài)，等待TCP連接到來(lái)

5.開(kāi)啟H.264流媒體播放器，點(diǎn)擊“開(kāi)始視頻接收”，屏幕變黑

6.點(diǎn)擊“控制功能”，輸入設(shè)備端ip地址192.168.1.68，點(diǎn)擊連接

7.設(shè)備端出現(xiàn)下列字樣，表示連接成功

Servergetconnectionfrom192.168.1.68 8.點(diǎn)擊“開(kāi)啟視頻監(jiān)控”，獲得視頻數(shù)據(jù)

實(shí)驗(yàn)十一Tcp網(wǎng)絡(luò)編程

一、實(shí)驗(yàn)?zāi)康?/p>

1.了解網(wǎng)絡(luò)編程原理 2.了解套接字的使用

二、實(shí)驗(yàn)原理

嵌入式Linux的網(wǎng)絡(luò)通信程序是基于套接字模式的。Socket實(shí)際是網(wǎng)絡(luò)傳輸層供給應(yīng)用層的接口。常見(jiàn)的Socket有三種類型。1.流式Sockct 流式套接字提供可靠的，面向連接的通信流，它使用TCP協(xié)議，從而保證了數(shù)據(jù)傳輸?shù)恼_性和順序性。Socket編程采用客戶/服務(wù)器模式。因此編程分為服務(wù)器端和客戶端。服務(wù)器端：首先建立Socket，返回該Socket的描述符；配置Socket的端口和IP地址；建立監(jiān)聽(tīng)函數(shù)，檢測(cè)是否有客戶端向服務(wù)器端發(fā)送請(qǐng)求，若有則接收該請(qǐng)求，將其放到接收隊(duì)列中；從接收隊(duì)列中接收一個(gè)請(qǐng)求；并向客戶端發(fā)送確認(rèn)連接信息。客戶端：建立一個(gè)Socket，返回該Socket的描述符，配置Socket端口和IP地址；向服務(wù)器發(fā)送連接請(qǐng)求，并接收服務(wù)器發(fā)回的確認(rèn)連接信息。雙方通信結(jié)束后，關(guān)閉其Socket。2.數(shù)據(jù)報(bào)Socket，數(shù)據(jù)通過(guò)相互獨(dú)立的報(bào)文進(jìn)行傳輸，數(shù)據(jù)報(bào)套接字定義了一種無(wú)連接的服務(wù)，是無(wú)序的，并且不保證是可靠的，無(wú)差錯(cuò)的。它使用數(shù)據(jù)報(bào)協(xié)議UDP。3.原始Socket 使用Socket編程時(shí)可以開(kāi)發(fā)客戶機(jī)和服務(wù)器端應(yīng)用程序，它們可以在本地網(wǎng)絡(luò)上進(jìn)行通信，也可以通過(guò)Internet在全球范圍內(nèi)進(jìn)行通信。編寫(xiě)并運(yùn)行Socket的客戶端和服務(wù)器端程序，雙方通過(guò)套接字建立了服務(wù)連接請(qǐng)求，并且通過(guò)一些方法提高Socket的性能。

三、實(shí)驗(yàn)步驟

編寫(xiě)服務(wù)器端源程序和客戶端源程序

1.代碼：

program_20_1.c #include #include #include #include #include #include #include #include #include #include #include #include

int main(int argc, char *argv[]){

int sockfd,new_fd;

struct sockaddr_in server_addr;

struct sockaddr_in client_addr;

int portnumber;

const char hello[]=“Hello and Byen”;// for setsockopt()SO_REUSEADDR, below

int yes = 1;int addrlen;

if(argc!=2)

{

fprintf(stderr,“Usage:%s portnumberan”,argv[0]);

exit(1);

}

if((portnumber=atoi(argv[1]))<0)

{

fprintf(stderr,“Usage:%s portnumberan”,argv[0]);

exit(1);

}

/* 服務(wù)器端開(kāi)始建立socket描述符 */

if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)

{

fprintf(stderr,“Socket error:%sna”,strerror(errno));

exit(1);

}

printf(“Server-socket()is OK...n”);

// “address already in use” error message

if(setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes,sizeof(int))==-1)

{

perror(“Server-setsockopt()error lol!”);

exit(1);

}

printf(“Server-setsockopt()is OK...n”);

/* 服務(wù)器端填充 sockaddr結(jié)構(gòu) */

bzero(&server_addr,sizeof(struct sockaddr_in));

server_addr.sin_family=AF_INET;

server_addr.sin_addr.s_addr=htonl(INADDR_ANY);

server_addr.sin_port=htons(portnumber);

memset(&(server_addr.sin_zero), '