1、 perror(save the terminal setting exit(1); set terminal as need newt = oldt; newt.c_lflag &= ( ICANON | ECHO ); if(tcsetattr(STDIN_FILENO,TCSANOW, &newt) set terminalch = getchar();open_buzzer(); restore termial setting if(tcsetattr(STDIN_FILENO,TCSANOW,&restore the termial settingreturn ch;static i
2、nt fd = -1;static void close_buzzer(void);static void open_buzzer(void) fd = open(devpwm, 0); if (fd = 0) ioctl(fd, PWM_IOCTL_STOP); if (ioctl(fd, 2) perror(ioctl 2: close(fd); fd = -1;static void set_buzzer_freq(int freq) this IOCTL command is the key to set frequency int ret = ioctl(fd, PWM_IOCTL_
3、SET_FREQ, freq); if(ret set the frequency of the buzzerstatic void stop_buzzer(void) int ret = ioctl(fd, PWM_IOCTL_STOP);stop the buzzer if (ioctl(fd, 2) int main(int argc, char *argv) int freq = 1000 ; int buttons_fd; int i; int key; char butons8=0,; char current_buttons8; int count_of_changed_key;
4、 buttons_fd=open(devbuttons if(buttons_fd0) printf(open device buttons 0) while( 1 ) printf( tFreq = %dn, freq ); if(read(buttons_fd,current_buttons,size of current_buttons)!=sizof current_buttons) read butons: exit(1); for (i=0;i8;i+) if(buttonsi!=current_buttonsi) buttonsi=current_buttonsi; if(but
5、tonsi=1) key=i+1; switch(key) case 1: set_buzzer_freq(freq ); break; case 2: if( freq 11 ) freq -= 10 ;break;case 8:stop_buzzer();exit(0);default:c 题目2.模拟电压采集报警功能:(1)按键1:启动停止ADC,按键8:(2)程序初始化完成后,ADC的默认状态是停止。(3)ADC工作时,每秒采样一次电压,采集的数据写入文件adcdata.dat文件保存。(4)当ADC采样值超过1.5V的时候,蜂鸣器报警。二、流程图。三、实验步骤。stdio._buzz
6、er(void) any function exit call will stop the buzzerint main(void) int key=0; char buttons8= int len; char buffer30; int adc_wr; int flag1; int flag2; unsigned char buffBUFFER_SIZE; fprintf(stderr, press Ctrl-C to stopn int adc_fd = open(devadc if (adc_fd open ADC device: return 1; int buttons_fd=op
7、en(, O_NONBLOCK); int pwm_fd = open( if (pwm_fd tFreq =! %dn, key ); int len =read(buttons_fd,current_buttons,sizeof current_buttons);len:%d,len); for(flag2=0;flag2 if(len1500) set_buzzer_freq(freq); bufferlen = 0; int value = -1; sscanf(buffer, , &value); printf(ADC Value:, value); write(adc_wr,buf
8、fer,len); else perror(read ADC device: return 1; 题目3.串口数据保存1、实验要求。(1)PC(ubuntu)串口(COM2)定时(0.1s)通过发送字符串COM Data:numn”,其中num是指的是序号,每次发送序号加1,共计发送100次。(2)ARM(实验板)串口COM2接收PC(ubuntu)发过来的数据,将数据写入到comdata.dat的文件保存。Read可读文件:stdio.(void) int fd; char buffBUFFER_SIZE; if(fd = open_port(TARGET_COM_PORT) 0) open
9、_port if(set_com_config(fd, 8, N, 1) 0) adc_wr=open(ADCWR_FILE_NAME,O_WRONLY|O_CREAT|O_APPEND,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); write(adc_wr,buff,sizeof(buff); while(strncmp(buff, quit, 4); return 0;Write 可写文件: char s20; if(fd = open_port(HOST_COM_PORT) perror( for(i=0;100; memset(s, 0, 20); sprintf
10、(s,i); *memcpy(buff, , BUFFER_SIZE);* strcpy(buff, strcat(buff,s); *if (fgets(buff, BUFFER_SIZE, stdin) = NULL)fgets * write(fd, buff, strlen(buff); usleep(100* 1000); memset(buff, 0, BUFFER_SIZE); strcpy(buff, write(fd, buff, strlen(buff); close(fd);编程设计题:ADC数据网络传输程序(1) 读取ADC频率为50次每秒.(2) 当读取了50次数据再
11、通过TCP发送数据。(3) PC和ARM程序需要做网络传输包的计数器。(每次传输的数据(50字节)叫一个网络包。(4) PC服务端需要将接收的网络包数和数据打印出来,并保存到文件名为adc_tcp文件中。在pc建立tcp server端,接收arm实验板发送的数据。在arm实验板上采集adc数据,在通过tcp将adc采集的数据发送到pc。则client 端:systypes.(int argc, char *argv) int sockfd, sendbytes; char bufBUFFER_SIZE; char s1300; char s220; struct serv_addr; int
12、 k=0; if(argc 3) fprintf(stderr,USAGE: .client Hostname(or ip address) Textn *地址解析函数* if ( 结构体中相关参数* serv_addr.sin_family = AF_INET; serv_addr.sin_port = _addr = *(struct in_addr *)_zero), 8); *调用connect函数主动发起对服务器端的连接* if(connect(sockfd,(struct sockaddr *)&serv_addr, sizeof(struct sockaddr)= -1)conn
13、ect while(1) k+; sprintf(s2,the number%-2d,k); strcat(buf,s2); for(i=0;50; int len = read(adc_fd, buffer, sizeof buffer -1); bufferlen = int value = -1; sscanf(buffer, printf( sprintf(s1, %4d strcat(buf,s1); usleep(20*1000); *发送消息给服务器端* if (sendbytes = send(sockfd, buf, strlen(buf), 0) = -1)send mem
14、set(s1, 0, 300); memset(buf, 0, sizeof(buf); close(sockfd); exit(0);Server端:systypes.() struct sockaddr_in server_sockaddr, client_sockaddr; int sin_size, recvbytes; int sockfd, client_fd; *建立socket连接* if (sockfd = socket(AF_INET,SOCK_STREAM,0)= -1)socket printf(Socket id = %dn,sockfd); *设置sockaddr_
15、in 结构体中相关参数* server_sockaddr.sin_family = AF_INET; server_sockaddr.sin_port = _addr.s_addr = INADDR_ANY; bzero(&(server_sockaddr.sin_zero), 8); int i = 1;* 使得重复使用本地地址与套接字进行绑定 * setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i); *绑定函数bind* if (bind(sockfd, (struct sockaddr *)&server_sockaddr
16、, sizeof(struct sockaddr)= -1)bindBind success!n *调用listen函数* if (listen(sockfd, MAX_QUE_CONN_NM) = -1)listenListening.n *调用accept函数,等待客户端的连接* if (client_fd = accept(sockfd, (struct sockaddr *)&client_sockaddr, &sin_size) = -1)acceptClient Socket id = %dn,client_fd ); *调用recv函数接收客户端的请求* memset(buf , 0, sizeof(buf); if (recvbytes = recv(client_fd, buf, BUFFER_SIZE, 0) = -1)recvReceived a message: %sn, buf);, recvbytes); adc_wr=open(ADCWR_FILE_NAME,O_WRONLY|O_CREAT|O_APPEND,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); write(adc_wr,buf,rec
copyright@ 2008-2022 冰豆网网站版权所有
经营许可证编号:鄂ICP备2022015515号-1