linux多线程下打开串口发送和接收数据

 

1 启动线程1读串口

2 等待3秒后

3 启动线程2写串口,发送字符串后关闭

4 等待10秒

5 关闭两个线程

 

 

 

#include <pthread.h>#include <stdio.h>#include <sys/time.h>#include <string.h>#include<termios.h>#include<sys/stat.h>#include<fcntl.h>#define BAUDRATE B115200#define MODEMDEVICE "/dev/ttyS0"#define R_BUF_LEN (256)void printtid(void);void* com_read(void* pstatu){printtid();int i=0;int fd,c=0,num;struct termios oldtio,newtio;char buf[R_BUF_LEN];printf("start.../n");/*打开PC机的COM1通信端口*/fd=open(MODEMDEVICE,O_RDWR | O_NOCTTY | O_NONBLOCK/*| O_NDELAY*/);if(fd<0){perror(MODEMDEVICE);exit(1);}printf("open .../n");/*将目前终端机的结构保存至oldtio结构*/tcgetattr(fd,&oldtio);/*清除newtio结构，重新设置通信协议*/bzero(&newtio,sizeof(newtio));/*通信协议设为8N1,8位数据位,N没有效验,1位结束位*/newtio.c_cflag = BAUDRATE |CS8|CLOCAL|CREAD;newtio.c_iflag = IGNPAR;newtio.c_oflag = 0;/*设置为正规模式*/newtio.c_lflag=ICANON;/*清除所有队列在串口的输入*/tcflush(fd,TCIFLUSH);/*新的termios的结构作为通信端口的参数*/tcsetattr(fd,TCSANOW,&newtio);printf("reading.../n");while(*(int*)pstatu){num = read(fd,buf, R_BUF_LEN);buf[R_BUF_LEN-1] = 0;if(num > 0 && num <= R_BUF_LEN){ buf[num]=0;printf("%s", buf);fflush(stdout);}}printf("close.../n");close(fd);/*恢复旧的通信端口参数*/tcsetattr(fd,TCSANOW,&oldtio);}void* com_send(void* p){printtid();int fd,c=0;struct termios oldtio,newtio;char ch;static char s1[20];printf("Start.../n ");/*打开arm平台的COM1通信端口*/fd=open(MODEMDEVICE,O_RDWR | O_NOCTTY);if(fd<0){perror(MODEMDEVICE);exit(1);}printf(" Open.../n "); /*将目前终端机的结构保存至oldtio结构*/ tcgetattr(fd,&oldtio);/*清除newtio结构，重新设置通信协议*/bzero(&newtio,sizeof(newtio));/*通信协议设为8N1*/newtio.c_cflag =BAUDRATE |CS8|CLOCAL|CREAD; //波特率 8个数据位 本地连接 接受使能newtio.c_iflag=IGNPAR; //忽略奇偶校验错误newtio.c_oflag=0;/*设置为正规模式*/newtio.c_lflag=ICANON; //规范输入/*清除所有队列在串口的输出*/tcflush(fd,TCOFLUSH);/*新的termios的结构作为通信端口的参数*/tcsetattr(fd,TCSANOW,&newtio);printf("Writing.../n ");///*while(*(char*)p != 0){int res = 0;res = write(fd,(char*)p, 1);if(res != 1) printf("send %c error/n", *(char*)p);else printf("send %c ok/n", *(char*)p);++p;}printf("Close.../n");close(fd);/*还原旧的通信端口参数*/tcsetattr(fd,TCSANOW,&oldtio);printf("leave send thread/n");}/*开始线程thread_fun线程函数pthread线程函数所在pthread变量par线程函数参数COM_STATU线程函数状态控制变量 1:运行 0:退出*/int start_thread_func(void*(*func)(void*), pthread_t* pthread, void* par, int* COM_STATU){*COM_STATU = 1;memset(pthread, 0, sizeof(pthread_t));int temp; /*创建线程*/ if((temp = pthread_create(pthread, NULL, func, par)) != 0)printf("线程创建失败!/n"); else{int id = pthread_self(); printf("线程%u被创建/n", *pthread);}return temp;}/*结束线程pthread线程函数所在pthread变量COM_STATU线程函数状态控制变量 1:运行 0:退出*/int stop_thread_func(pthread_t* pthread, int* COM_STATU){printf("prepare stop thread %u/n", *pthread);*COM_STATU = 0; if(*pthread !=0) { pthread_join(*pthread, NULL);}printf("线程%d退出!/n", *COM_STATU);}void printtid(void){int id = pthread_self(); printf("in thread %u/n", id);}int main(){pthread_t thread[2];printtid();const int READ_THREAD_ID = 0;const int SEND_THREAD_ID = 1;int COM_READ_STATU = 0;int COM_SEND_STATU = 0;if(start_thread_func(com_read, &thread[READ_THREAD_ID], &COM_READ_STATU, &COM_READ_STATU) != 0){printf("error to leave/n");return -1;}printf("wait 3 sec/n");sleep(3);printf("wake after 3 sec/n");if(start_thread_func(com_send, &thread[SEND_THREAD_ID], "ABCDEFGHIJKLMNOPQRST", &COM_SEND_STATU) != 0){printf("error to leave/n");return -1;}printtid();printf("wait 10 sec/n");sleep(10);printf("wake after 10 sec/n");stop_thread_func(&thread[READ_THREAD_ID], &COM_READ_STATU);stop_thread_func(&thread[SEND_THREAD_ID], &COM_SEND_STATU);return 0;}

 

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