linux_com.rar_com 串口 linux_linux 串口_linux 串口 通讯_linux串口通讯_串口通讯 l

#include <termios.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <pthread.h> #define BAUDRATE B115200 #define COM1 "/dev/ttyS0" #define COM2 "/dev/ttyS1" #define ENDMINITERM 27 #define FALSE 0 #define TRUE 1 volatile int STOP=FALSE; volatile int fd; void* keyboard(void * data) { int c; for (;;){ c=getchar(); if( c== ENDMINITERM){ STOP=TRUE; break ; } } return NULL; } void* receive(void * data) { int c; printf("read modem\n"); while (STOP==FALSE) { //在此处补充填写代码？实现读取串口数据、并将数据在标准终端上写出来 if(read(fd, data, ENDMINITERM)==0) return data; } printf("exit from reading modem\n"); return NULL; } void* send(void * data) { int c='0'; printf("send data\n"); while (STOP==FALSE) { c++; c %= 255; //在此处补充填写代码？实现写入串口数据 if(write(fd, data, ENDMINITERM) < 0) exit(1); usleep(1000000); } printf("exit from send modem\n"); return NULL; } int main(int argc,char** argv) { struct termios oldtio,newtio; pthread_t th_a, th_b, th_c; //在此处补充填写代码？实现打开串口1的功能 fd = open(COM1,O_RDWR); if (fd <0) { perror(COM1); exit(-1); } tcgetattr(fd,&oldtio); newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;/*ctrol flag*/ newtio.c_iflag = IGNPAR; newtio.c_oflag = 0; newtio.c_lflag = 0; newtio.c_cc[VMIN]=1; newtio.c_cc[VTIME]=0; tcflush(fd, TCIFLUSH); tcsetattr(fd,TCSANOW,&newtio); //在此处补充填写代码？实现创建键盘监控、接收、发送三个线程，并等待线程结束 if(pthread_create (&th_a, 0, keyboard, 0) != 0) exit(1); pthread_join(th_a,NULL); if(pthread_create (&th_b, 0, receive, 0) != 0) exit(1); pthread_join(th_b,NULL); if(pthread_create (&th_c, 0, send, 0) != 0) exit(1); pthread_join(th_c,NULL); tcsetattr(fd,TCSANOW,&oldtio); /*恢复串口设置*/ //在此处补充填写代码？实现关闭串口功能 close(fd); exit(0); }