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#include <stdio.h> |
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#include <stdlib.h> |
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#include <strings.h> |
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#include <string.h> |
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#include <pthread.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <stdlib.h> |
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#include <error.h> |
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#include <termios.h> |
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#include <malloc.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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typedef struct termios termios_t; |
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typedef struct serial_data |
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{ |
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char databuf[100]; // 发送/接受数据 |
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int serfd; // 串口文件描述符 |
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} ser_Data; |
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void *sersend(void *arg); |
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void *serrecv(void *arg); |
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int main(int argc, char *argv[]) |
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{ |
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pthread_t pid1, pid2; |
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pthread_attr_t *pthread_arr1, *pthread_arr2; |
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pthread_arr1 = NULL; |
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pthread_arr2 = NULL; |
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int serport1fd; |
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/* 进行串口参数设置 */ |
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termios_t *ter_s = malloc(sizeof(*ter_s)); |
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serport1fd = open(argv[1], O_RDWR | O_NOCTTY | O_NDELAY); // 不成为控制终端程序,不受其他程序输出输出影响 |
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if (serport1fd < 0) |
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{ |
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printf("%s open faild\r\n", argv[1]); |
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return -1; |
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} |
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bzero(ter_s, sizeof(*ter_s)); |
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ter_s->c_cflag |= CLOCAL | CREAD; // 激活本地连接与接受使能 |
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ter_s->c_cflag &= ~CSIZE; // 失能数据位屏蔽 |
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ter_s->c_cflag |= CS8; // 8位数据位 |
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ter_s->c_cflag &= ~CSTOPB; // 1位停止位 |
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ter_s->c_cflag &= ~PARENB; // 无校验位 |
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ter_s->c_cc[VTIME] = 0; |
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ter_s->c_cc[VMIN] = 0; |
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/*1 VMIN> 0 && VTIME> 0 |
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VMIN为最少读取的字符数,当读取到一个字符后,会启动一个定时器,在定时器超时事前,如果已经读取到了VMIN个字符,则read返回VMIN个字符。如果在接收到VMIN个字符之前,定时器已经超时,则read返回已读取到的字符,注意这个定时器会在每次读取到一个字符后重新启用,即重新开始计时,而且是读取到第一个字节后才启用,也就是说超时的情况下,至少读取到一个字节数据。 |
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2 VMIN > 0 && VTIME== 0 |
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在只有读取到VMIN个字符时,read才返回,可能造成read被永久阻塞。 |
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3 VMIN == 0 && VTIME> 0 |
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和第一种情况稍有不同,在接收到一个字节时或者定时器超时时,read返回。如果是超时这种情况,read返回值是0。 |
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4 VMIN == 0 && VTIME== 0 |
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这种情况下read总是立即就返回,即不会被阻塞。----by 解释粘贴自博客园 |
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*/ |
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cfsetispeed(ter_s, B115200); // 设置输入波特率 |
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cfsetospeed(ter_s, B115200); // 设置输出波特率 |
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tcflush(serport1fd, TCIFLUSH); // 刷清未处理的输入和/或输出 |
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if (tcsetattr(serport1fd, TCSANOW, ter_s) != 0) |
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{ |
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printf("com set error!\r\n"); |
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} |
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char buffer[] = {"hello my world!\r\n"}; |
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char recvbuf[100] = {}; |
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ser_Data snd_data; |
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ser_Data rec_data; |
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snd_data.serfd = serport1fd; |
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rec_data.serfd = serport1fd; |
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memcpy(snd_data.databuf, buffer, strlen(buffer)); // 拷贝发送数据 |
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pthread_create(&pid1, pthread_arr1, sersend, (void *)&snd_data); |
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pthread_create(&pid2, pthread_arr2, serrecv, (void *)&rec_data); |
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ssize_t sizec; |
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while (1) |
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{ |
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usleep(100000); |
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} |
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pthread_join(pid1, NULL); |
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pthread_join(pid2, NULL); |
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free(ter_s); |
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return 0; |
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} |
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void *sersend(void *arg) // 串口发送线程函数 |
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{ |
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ser_Data *snd = (ser_Data *)arg; |
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int ret; |
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while (1) |
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{ |
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ret = write(snd->serfd, snd->databuf, strlen(snd->databuf)); |
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if (ret > 0) |
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{ |
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printf("send success, data is %s\r\n", snd->databuf); |
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} |
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else |
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{ |
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printf("send error!\r\n"); |
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} |
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usleep(300000); |
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/* |
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if(发生中断) |
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break;//退出 |
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*/ |
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} |
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} |
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void *serrecv(void *arg) // 串口发送线程函数 |
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{ |
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ser_Data *rec = (ser_Data *)arg; |
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int ret; |
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while (1) |
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{ |
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ret = read(rec->serfd, rec->databuf, 1024); |
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if (ret > 0) |
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{ |
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printf("recv success,recv size is %d,data is %s\r\n", ret, rec->databuf); |
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} |
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else |
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{ |
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/* |
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什么也不做 |
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*/ |
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} |
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usleep(1000); |
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/* |
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if(发生中断) |
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break;//退出 |
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*/ |
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} |
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} |
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